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Code Issues Releases Wiki Activity
7f8863f741
curl/m4/curl-compilers.m4
Marcel Raad ae5b6deb15
configure: allow disabling warnings 
When using `--enable-warnings`, it was not possible to disable warnings
via CFLAGS that got explicitly enabled. Now warnings are not enabled
anymore if they are explicitly disabled (or enabled) in CFLAGS. This
works for at least GCC, clang, and TCC as they have corresponding
`-Wno-` options for every warning.

Closes https://github.com/curl/curl/pull/5689
2020-07-17 09:35:16 +02:00

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#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.haxx.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
#***************************************************************************
# File version for 'aclocal' use. Keep it a single number.
# serial 67
dnl CURL_CHECK_COMPILER
dnl -------------------------------------------------
dnl Verify if the C compiler being used is known.
AC_DEFUN([CURL_CHECK_COMPILER], [
#
compiler_id="unknown"
compiler_num="0"
#
flags_dbg_all="unknown"
flags_dbg_yes="unknown"
flags_dbg_off="unknown"
flags_opt_all="unknown"
flags_opt_yes="unknown"
flags_opt_off="unknown"
#
flags_prefer_cppflags="no"
#
CURL_CHECK_COMPILER_DEC_C
CURL_CHECK_COMPILER_HPUX_C
CURL_CHECK_COMPILER_IBM_C
CURL_CHECK_COMPILER_INTEL_C
CURL_CHECK_COMPILER_CLANG
CURL_CHECK_COMPILER_GNU_C
CURL_CHECK_COMPILER_LCC
CURL_CHECK_COMPILER_SGI_MIPSPRO_C
CURL_CHECK_COMPILER_SGI_MIPS_C
CURL_CHECK_COMPILER_SUNPRO_C
CURL_CHECK_COMPILER_TINY_C
CURL_CHECK_COMPILER_WATCOM_C
#
if test "$compiler_id" = "unknown"; then
cat <<_EOF 1>&2
***
*** Warning: This configure script does not have information about the
*** compiler you are using, relative to the flags required to enable or
*** disable generation of debug info, optimization options or warnings.
***
*** Whatever settings are present in CFLAGS will be used for this run.
***
*** If you wish to help the curl project to better support your compiler
*** you can report this and the required info on the libcurl development
*** mailing list: https://cool.haxx.se/mailman/listinfo/curl-library/
***
_EOF
fi
])
dnl CURL_CHECK_COMPILER_CLANG
dnl -------------------------------------------------
dnl Verify if compiler being used is clang.
AC_DEFUN([CURL_CHECK_COMPILER_CLANG], [
AC_BEFORE([$0],[CURL_CHECK_COMPILER_GNU_C])dnl
AC_MSG_CHECKING([if compiler is clang])
CURL_CHECK_DEF([__clang__], [], [silent])
if test "$curl_cv_have_def___clang__" = "yes"; then
AC_MSG_RESULT([yes])
AC_MSG_CHECKING([if compiler is xlclang])
CURL_CHECK_DEF([__ibmxl__], [], [silent])
if test "$curl_cv_have_def___ibmxl__" = "yes" ; then
dnl IBM's almost-compatible clang version
AC_MSG_RESULT([yes])
compiler_id="XLCLANG"
else
AC_MSG_RESULT([no])
compiler_id="CLANG"
fi
fullclangver=`$CC -v 2>&1 | grep version`
clangver=`echo $fullclangver | grep "based on LLVM " | "$SED" 's/.*(based on LLVM \(@<:@0-9@:>@*\.@<:@0-9@:>@*\).*)/\1/'`
if test -z "$clangver"; then
if echo $fullclangver | grep "Apple LLVM version " >/dev/null; then
dnl Starting with XCode 7 / clang 3.7, Apple clang won't tell its upstream version
clangver="3.7"
else
clangver=`echo $fullclangver | "$SED" 's/.*version \(@<:@0-9@:>@*\.@<:@0-9@:>@*\).*/\1/'`
fi
fi
clangvhi=`echo $clangver | cut -d . -f1`
clangvlo=`echo $clangver | cut -d . -f2`
compiler_num=`(expr $clangvhi "*" 100 + $clangvlo) 2>/dev/null`
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_all="$flags_dbg_all -ggdb"
flags_dbg_all="$flags_dbg_all -gstabs"
flags_dbg_all="$flags_dbg_all -gstabs+"
flags_dbg_all="$flags_dbg_all -gcoff"
flags_dbg_all="$flags_dbg_all -gxcoff"
flags_dbg_all="$flags_dbg_all -gdwarf-2"
flags_dbg_all="$flags_dbg_all -gvms"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -Os -O3 -O4"
flags_opt_yes="-Os"
flags_opt_off="-O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_DEC_C
dnl -------------------------------------------------
dnl Verify if compiler being used is DEC C.
AC_DEFUN([CURL_CHECK_COMPILER_DEC_C], [
AC_MSG_CHECKING([if compiler is DEC/Compaq/HP C])
CURL_CHECK_DEF([__DECC], [], [silent])
CURL_CHECK_DEF([__DECC_VER], [], [silent])
if test "$curl_cv_have_def___DECC" = "yes" &&
test "$curl_cv_have_def___DECC_VER" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="DEC_C"
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_yes="-g2"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -O4"
flags_opt_yes="-O1"
flags_opt_off="-O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_GNU_C
dnl -------------------------------------------------
dnl Verify if compiler being used is GNU C
dnl
dnl $compiler_num will be set to MAJOR * 100 + MINOR for gcc less than version
dnl 7 and just $MAJOR * 100 for gcc version 7 and later.
dnl
dnl Examples:
dnl Version 1.2.3 => 102
dnl Version 2.95 => 295
dnl Version 4.7 => 407
dnl Version 9.2.1 => 900
dnl
AC_DEFUN([CURL_CHECK_COMPILER_GNU_C], [
AC_REQUIRE([CURL_CHECK_COMPILER_INTEL_C])dnl
AC_REQUIRE([CURL_CHECK_COMPILER_CLANG])dnl
AC_MSG_CHECKING([if compiler is GNU C])
CURL_CHECK_DEF([__GNUC__], [], [silent])
if test "$curl_cv_have_def___GNUC__" = "yes" &&
test "$compiler_id" = "unknown"; then
AC_MSG_RESULT([yes])
compiler_id="GNU_C"
gccver=`$CC -dumpversion`
gccvhi=`echo $gccver | cut -d . -f1`
gccvlo=`echo $gccver | cut -d . -f2`
compiler_num=`(expr $gccvhi "*" 100 + $gccvlo) 2>/dev/null`
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_all="$flags_dbg_all -ggdb"
flags_dbg_all="$flags_dbg_all -gstabs"
flags_dbg_all="$flags_dbg_all -gstabs+"
flags_dbg_all="$flags_dbg_all -gcoff"
flags_dbg_all="$flags_dbg_all -gxcoff"
flags_dbg_all="$flags_dbg_all -gdwarf-2"
flags_dbg_all="$flags_dbg_all -gvms"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -Os -Og -Ofast"
flags_opt_yes="-O2"
flags_opt_off="-O0"
CURL_CHECK_DEF([_WIN32], [], [silent])
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_HPUX_C
dnl -------------------------------------------------
dnl Verify if compiler being used is HP-UX C.
AC_DEFUN([CURL_CHECK_COMPILER_HPUX_C], [
AC_MSG_CHECKING([if compiler is HP-UX C])
CURL_CHECK_DEF([__HP_cc], [], [silent])
if test "$curl_cv_have_def___HP_cc" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="HP_UX_C"
flags_dbg_all="-g -s"
flags_dbg_yes="-g"
flags_dbg_off="-s"
flags_opt_all="-O +O0 +O1 +O2 +O3 +O4"
flags_opt_yes="+O2"
flags_opt_off="+O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_IBM_C
dnl -------------------------------------------------
dnl Verify if compiler being used is IBM C.
AC_DEFUN([CURL_CHECK_COMPILER_IBM_C], [
AC_MSG_CHECKING([if compiler is IBM C])
CURL_CHECK_DEF([__IBMC__], [], [silent])
if test "$curl_cv_have_def___IBMC__" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="IBM_C"
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -O4 -O5"
flags_opt_all="$flags_opt_all -qnooptimize"
flags_opt_all="$flags_opt_all -qoptimize=0"
flags_opt_all="$flags_opt_all -qoptimize=1"
flags_opt_all="$flags_opt_all -qoptimize=2"
flags_opt_all="$flags_opt_all -qoptimize=3"
flags_opt_all="$flags_opt_all -qoptimize=4"
flags_opt_all="$flags_opt_all -qoptimize=5"
flags_opt_yes="-O2"
flags_opt_off="-qnooptimize"
flags_prefer_cppflags="yes"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_INTEL_C
dnl -------------------------------------------------
dnl Verify if compiler being used is Intel C.
AC_DEFUN([CURL_CHECK_COMPILER_INTEL_C], [
AC_BEFORE([$0],[CURL_CHECK_COMPILER_GNU_C])dnl
AC_MSG_CHECKING([if compiler is Intel C])
CURL_CHECK_DEF([__INTEL_COMPILER], [], [silent])
if test "$curl_cv_have_def___INTEL_COMPILER" = "yes"; then
AC_MSG_RESULT([yes])
compiler_num="$curl_cv_def___INTEL_COMPILER"
CURL_CHECK_DEF([__unix__], [], [silent])
if test "$curl_cv_have_def___unix__" = "yes"; then
compiler_id="INTEL_UNIX_C"
flags_dbg_all="-g -g0"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -Os"
flags_opt_yes="-O2"
flags_opt_off="-O0"
else
compiler_id="INTEL_WINDOWS_C"
flags_dbg_all="/ZI /Zi /zI /zi /ZD /Zd /zD /zd /Z7 /z7 /Oy /Oy-"
flags_dbg_all="$flags_dbg_all /debug"
flags_dbg_all="$flags_dbg_all /debug:none"
flags_dbg_all="$flags_dbg_all /debug:minimal"
flags_dbg_all="$flags_dbg_all /debug:partial"
flags_dbg_all="$flags_dbg_all /debug:full"
flags_dbg_all="$flags_dbg_all /debug:semantic_stepping"
flags_dbg_all="$flags_dbg_all /debug:extended"
flags_dbg_yes="/Zi /Oy-"
flags_dbg_off="/debug:none /Oy-"
flags_opt_all="/O /O0 /O1 /O2 /O3 /Od /Og /Og- /Oi /Oi-"
flags_opt_yes="/O2"
flags_opt_off="/Od"
fi
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_LCC
dnl -------------------------------------------------
dnl Verify if compiler being used is LCC.
AC_DEFUN([CURL_CHECK_COMPILER_LCC], [
AC_MSG_CHECKING([if compiler is LCC])
CURL_CHECK_DEF([__LCC__], [], [silent])
if test "$curl_cv_have_def___LCC__" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="LCC"
flags_dbg_all="-g"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all=""
flags_opt_yes=""
flags_opt_off=""
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_SGI_MIPS_C
dnl -------------------------------------------------
dnl Verify if compiler being used is SGI MIPS C.
AC_DEFUN([CURL_CHECK_COMPILER_SGI_MIPS_C], [
AC_REQUIRE([CURL_CHECK_COMPILER_SGI_MIPSPRO_C])dnl
AC_MSG_CHECKING([if compiler is SGI MIPS C])
CURL_CHECK_DEF([__GNUC__], [], [silent])
CURL_CHECK_DEF([__sgi], [], [silent])
if test "$curl_cv_have_def___GNUC__" = "no" &&
test "$curl_cv_have_def___sgi" = "yes" &&
test "$compiler_id" = "unknown"; then
AC_MSG_RESULT([yes])
compiler_id="SGI_MIPS_C"
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -Ofast"
flags_opt_yes="-O2"
flags_opt_off="-O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_SGI_MIPSPRO_C
dnl -------------------------------------------------
dnl Verify if compiler being used is SGI MIPSpro C.
AC_DEFUN([CURL_CHECK_COMPILER_SGI_MIPSPRO_C], [
AC_BEFORE([$0],[CURL_CHECK_COMPILER_SGI_MIPS_C])dnl
AC_MSG_CHECKING([if compiler is SGI MIPSpro C])
CURL_CHECK_DEF([__GNUC__], [], [silent])
CURL_CHECK_DEF([_COMPILER_VERSION], [], [silent])
CURL_CHECK_DEF([_SGI_COMPILER_VERSION], [], [silent])
if test "$curl_cv_have_def___GNUC__" = "no" &&
(test "$curl_cv_have_def__SGI_COMPILER_VERSION" = "yes" ||
test "$curl_cv_have_def__COMPILER_VERSION" = "yes"); then
AC_MSG_RESULT([yes])
compiler_id="SGI_MIPSPRO_C"
flags_dbg_all="-g -g0 -g1 -g2 -g3"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all="-O -O0 -O1 -O2 -O3 -Ofast"
flags_opt_yes="-O2"
flags_opt_off="-O0"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_SUNPRO_C
dnl -------------------------------------------------
dnl Verify if compiler being used is SunPro C.
AC_DEFUN([CURL_CHECK_COMPILER_SUNPRO_C], [
AC_MSG_CHECKING([if compiler is SunPro C])
CURL_CHECK_DEF([__SUNPRO_C], [], [silent])
if test "$curl_cv_have_def___SUNPRO_C" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="SUNPRO_C"
flags_dbg_all="-g -s"
flags_dbg_yes="-g"
flags_dbg_off="-s"
flags_opt_all="-O -xO -xO1 -xO2 -xO3 -xO4 -xO5"
flags_opt_yes="-xO2"
flags_opt_off=""
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_TINY_C
dnl -------------------------------------------------
dnl Verify if compiler being used is Tiny C.
AC_DEFUN([CURL_CHECK_COMPILER_TINY_C], [
AC_MSG_CHECKING([if compiler is Tiny C])
CURL_CHECK_DEF([__TINYC__], [], [silent])
if test "$curl_cv_have_def___TINYC__" = "yes"; then
AC_MSG_RESULT([yes])
compiler_id="TINY_C"
flags_dbg_all="-g -b"
flags_dbg_yes="-g"
flags_dbg_off=""
flags_opt_all=""
flags_opt_yes=""
flags_opt_off=""
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_WATCOM_C
dnl -------------------------------------------------
dnl Verify if compiler being used is Watcom C.
AC_DEFUN([CURL_CHECK_COMPILER_WATCOM_C], [
AC_MSG_CHECKING([if compiler is Watcom C])
CURL_CHECK_DEF([__WATCOMC__], [], [silent])
if test "$curl_cv_have_def___WATCOMC__" = "yes"; then
AC_MSG_RESULT([yes])
CURL_CHECK_DEF([__UNIX__], [], [silent])
if test "$curl_cv_have_def___UNIX__" = "yes"; then
compiler_id="WATCOM_UNIX_C"
flags_dbg_all="-g1 -g1+ -g2 -g3"
flags_dbg_yes="-g2"
flags_dbg_off=""
flags_opt_all="-O0 -O1 -O2 -O3"
flags_opt_yes="-O2"
flags_opt_off="-O0"
else
compiler_id="WATCOM_WINDOWS_C"
flags_dbg_all=""
flags_dbg_yes=""
flags_dbg_off=""
flags_opt_all=""
flags_opt_yes=""
flags_opt_off=""
fi
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CONVERT_INCLUDE_TO_ISYSTEM
dnl -------------------------------------------------
dnl Changes standard include paths present in CFLAGS
dnl and CPPFLAGS into isystem include paths. This is
dnl done to prevent GNUC from generating warnings on
dnl headers from these locations, although on ancient
dnl GNUC versions these warnings are not silenced.
AC_DEFUN([CURL_CONVERT_INCLUDE_TO_ISYSTEM], [
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_MSG_CHECKING([convert -I options to -isystem])
if test "$compiler_id" = "GNU_C" ||
test "$compiler_id" = "CLANG"; then
AC_MSG_RESULT([yes])
tmp_has_include="no"
tmp_chg_FLAGS="$CFLAGS"
for word1 in $tmp_chg_FLAGS; do
case "$word1" in
-I*)
tmp_has_include="yes"
;;
esac
done
if test "$tmp_has_include" = "yes"; then
tmp_chg_FLAGS=`echo "$tmp_chg_FLAGS" | "$SED" 's/^-I/ -isystem /g'`
tmp_chg_FLAGS=`echo "$tmp_chg_FLAGS" | "$SED" 's/ -I/ -isystem /g'`
CFLAGS="$tmp_chg_FLAGS"
squeeze CFLAGS
fi
tmp_has_include="no"
tmp_chg_FLAGS="$CPPFLAGS"
for word1 in $tmp_chg_FLAGS; do
case "$word1" in
-I*)
tmp_has_include="yes"
;;
esac
done
if test "$tmp_has_include" = "yes"; then
tmp_chg_FLAGS=`echo "$tmp_chg_FLAGS" | "$SED" 's/^-I/ -isystem /g'`
tmp_chg_FLAGS=`echo "$tmp_chg_FLAGS" | "$SED" 's/ -I/ -isystem /g'`
CPPFLAGS="$tmp_chg_FLAGS"
squeeze CPPFLAGS
fi
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_COMPILER_WORKS_IFELSE ([ACTION-IF-WORKS], [ACTION-IF-NOT-WORKS])
dnl -------------------------------------------------
dnl Verify if the C compiler seems to work with the
dnl settings that are 'active' at the time the test
dnl is performed.
AC_DEFUN([CURL_COMPILER_WORKS_IFELSE], [
dnl compilation capability verification
tmp_compiler_works="unknown"
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
]],[[
int i = 1;
return i;
]])
],[
tmp_compiler_works="yes"
],[
tmp_compiler_works="no"
echo " " >&6
sed 's/^/cc-fail: /' conftest.err >&6
echo " " >&6
])
dnl linking capability verification
if test "$tmp_compiler_works" = "yes"; then
AC_LINK_IFELSE([
AC_LANG_PROGRAM([[
]],[[
int i = 1;
return i;
]])
],[
tmp_compiler_works="yes"
],[
tmp_compiler_works="no"
echo " " >&6
sed 's/^/link-fail: /' conftest.err >&6
echo " " >&6
])
fi
dnl only do runtime verification when not cross-compiling
if test "x$cross_compiling" != "xyes" &&
test "$tmp_compiler_works" = "yes"; then
CURL_RUN_IFELSE([
AC_LANG_PROGRAM([[
# ifdef __STDC__
# include <stdlib.h>
# endif
]],[[
int i = 0;
exit(i);
]])
],[
tmp_compiler_works="yes"
],[
tmp_compiler_works="no"
echo " " >&6
echo "run-fail: test program exited with status $ac_status" >&6
echo " " >&6
])
fi
dnl branch upon test result
if test "$tmp_compiler_works" = "yes"; then
ifelse($1,,:,[$1])
ifelse($2,,,[else
$2])
fi
])
dnl CURL_SET_COMPILER_BASIC_OPTS
dnl -------------------------------------------------
dnl Sets compiler specific options/flags which do not
dnl depend on configure's debug, optimize or warnings
dnl options.
AC_DEFUN([CURL_SET_COMPILER_BASIC_OPTS], [
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
#
if test "$compiler_id" != "unknown"; then
#
tmp_save_CPPFLAGS="$CPPFLAGS"
tmp_save_CFLAGS="$CFLAGS"
tmp_CPPFLAGS=""
tmp_CFLAGS=""
#
case "$compiler_id" in
#
CLANG)
#
dnl Disable warnings for unused arguments, otherwise clang will
dnl warn about compile-time arguments used during link-time, like
dnl -O and -g and -pedantic.
tmp_CFLAGS="$tmp_CFLAGS -Qunused-arguments"
;;
#
DEC_C)
#
dnl Select strict ANSI C compiler mode
tmp_CFLAGS="$tmp_CFLAGS -std1"
dnl Turn off optimizer ANSI C aliasing rules
tmp_CFLAGS="$tmp_CFLAGS -noansi_alias"
dnl Generate warnings for missing function prototypes
tmp_CFLAGS="$tmp_CFLAGS -warnprotos"
dnl Change some warnings into fatal errors
tmp_CFLAGS="$tmp_CFLAGS -msg_fatal toofewargs,toomanyargs"
;;
#
GNU_C)
#
dnl turn implicit-function-declaration warning into error,
dnl at least gcc 2.95 and later support this
if test "$compiler_num" -ge "295"; then
tmp_CFLAGS="$tmp_CFLAGS -Werror-implicit-function-declaration"
fi
;;
#
HP_UX_C)
#
dnl Disallow run-time dereferencing of null pointers
tmp_CFLAGS="$tmp_CFLAGS -z"
dnl Disable some remarks
dnl #4227: padding struct with n bytes to align member
dnl #4255: padding size of struct with n bytes to alignment boundary
tmp_CFLAGS="$tmp_CFLAGS +W 4227,4255"
;;
#
IBM_C)
#
dnl Ensure that compiler optimizations are always thread-safe.
tmp_CPPFLAGS="$tmp_CPPFLAGS -qthreaded"
dnl Disable type based strict aliasing optimizations, using worst
dnl case aliasing assumptions when compiling. Type based aliasing
dnl would restrict the lvalues that could be safely used to access
dnl a data object.
tmp_CPPFLAGS="$tmp_CPPFLAGS -qnoansialias"
dnl Force compiler to stop after the compilation phase, without
dnl generating an object code file when compilation has errors.
tmp_CPPFLAGS="$tmp_CPPFLAGS -qhalt=e"
;;
#
INTEL_UNIX_C)
#
dnl On unix this compiler uses gcc's header files, so
dnl we select ANSI C89 dialect plus GNU extensions.
tmp_CFLAGS="$tmp_CFLAGS -std=gnu89"
dnl Change some warnings into errors
dnl #140: too many arguments in function call
dnl #147: declaration is incompatible with 'previous one'
dnl #165: too few arguments in function call
dnl #266: function declared implicitly
tmp_CPPFLAGS="$tmp_CPPFLAGS -we140,147,165,266"
dnl Disable some remarks
dnl #279: controlling expression is constant
dnl #981: operands are evaluated in unspecified order
dnl #1469: "cc" clobber ignored
tmp_CPPFLAGS="$tmp_CPPFLAGS -wd279,981,1469"
;;
#
INTEL_WINDOWS_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
LCC)
#
dnl Disallow run-time dereferencing of null pointers
tmp_CFLAGS="$tmp_CFLAGS -n"
;;
#
SGI_MIPS_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
SGI_MIPSPRO_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
SUNPRO_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
TINY_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
WATCOM_UNIX_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
WATCOM_WINDOWS_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
esac
#
squeeze tmp_CPPFLAGS
squeeze tmp_CFLAGS
#
if test ! -z "$tmp_CFLAGS" || test ! -z "$tmp_CPPFLAGS"; then
AC_MSG_CHECKING([if compiler accepts some basic options])
CPPFLAGS="$tmp_save_CPPFLAGS $tmp_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS $tmp_CFLAGS"
squeeze CPPFLAGS
squeeze CFLAGS
CURL_COMPILER_WORKS_IFELSE([
AC_MSG_RESULT([yes])
AC_MSG_NOTICE([compiler options added: $tmp_CFLAGS $tmp_CPPFLAGS])
],[
AC_MSG_RESULT([no])
AC_MSG_WARN([compiler options rejected: $tmp_CFLAGS $tmp_CPPFLAGS])
dnl restore initial settings
CPPFLAGS="$tmp_save_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS"
])
fi
#
fi
])
dnl CURL_SET_COMPILER_DEBUG_OPTS
dnl -------------------------------------------------
dnl Sets compiler specific options/flags which depend
dnl on configure's debug option.
AC_DEFUN([CURL_SET_COMPILER_DEBUG_OPTS], [
AC_REQUIRE([CURL_CHECK_OPTION_DEBUG])dnl
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
#
if test "$compiler_id" != "unknown"; then
#
tmp_save_CFLAGS="$CFLAGS"
tmp_save_CPPFLAGS="$CPPFLAGS"
#
tmp_options=""
tmp_CFLAGS="$CFLAGS"
tmp_CPPFLAGS="$CPPFLAGS"
CURL_VAR_STRIP([tmp_CFLAGS],[$flags_dbg_all])
CURL_VAR_STRIP([tmp_CPPFLAGS],[$flags_dbg_all])
#
if test "$want_debug" = "yes"; then
AC_MSG_CHECKING([if compiler accepts debug enabling options])
tmp_options="$flags_dbg_yes"
fi
if test "$want_debug" = "no"; then
AC_MSG_CHECKING([if compiler accepts debug disabling options])
tmp_options="$flags_dbg_off"
fi
#
if test "$flags_prefer_cppflags" = "yes"; then
CPPFLAGS="$tmp_CPPFLAGS $tmp_options"
CFLAGS="$tmp_CFLAGS"
else
CPPFLAGS="$tmp_CPPFLAGS"
CFLAGS="$tmp_CFLAGS $tmp_options"
fi
squeeze CPPFLAGS
squeeze CFLAGS
CURL_COMPILER_WORKS_IFELSE([
AC_MSG_RESULT([yes])
AC_MSG_NOTICE([compiler options added: $tmp_options])
],[
AC_MSG_RESULT([no])
AC_MSG_WARN([compiler options rejected: $tmp_options])
dnl restore initial settings
CPPFLAGS="$tmp_save_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS"
])
#
fi
])
dnl CURL_SET_COMPILER_OPTIMIZE_OPTS
dnl -------------------------------------------------
dnl Sets compiler specific options/flags which depend
dnl on configure's optimize option.
AC_DEFUN([CURL_SET_COMPILER_OPTIMIZE_OPTS], [
AC_REQUIRE([CURL_CHECK_OPTION_OPTIMIZE])dnl
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
#
if test "$compiler_id" != "unknown"; then
#
tmp_save_CFLAGS="$CFLAGS"
tmp_save_CPPFLAGS="$CPPFLAGS"
#
tmp_options=""
tmp_CFLAGS="$CFLAGS"
tmp_CPPFLAGS="$CPPFLAGS"
honor_optimize_option="yes"
#
dnl If optimization request setting has not been explicitly specified,
dnl it has been derived from the debug setting and initially assumed.
dnl This initially assumed optimizer setting will finally be ignored
dnl if CFLAGS or CPPFLAGS already hold optimizer flags. This implies
dnl that an initially assumed optimizer setting might not be honored.
#
if test "$want_optimize" = "assume_no" ||
test "$want_optimize" = "assume_yes"; then
AC_MSG_CHECKING([if compiler optimizer assumed setting might be used])
CURL_VAR_MATCH_IFELSE([tmp_CFLAGS],[$flags_opt_all],[
honor_optimize_option="no"
])
CURL_VAR_MATCH_IFELSE([tmp_CPPFLAGS],[$flags_opt_all],[
honor_optimize_option="no"
])
AC_MSG_RESULT([$honor_optimize_option])
if test "$honor_optimize_option" = "yes"; then
if test "$want_optimize" = "assume_yes"; then
want_optimize="yes"
fi
if test "$want_optimize" = "assume_no"; then
want_optimize="no"
fi
fi
fi
#
if test "$honor_optimize_option" = "yes"; then
CURL_VAR_STRIP([tmp_CFLAGS],[$flags_opt_all])
CURL_VAR_STRIP([tmp_CPPFLAGS],[$flags_opt_all])
if test "$want_optimize" = "yes"; then
AC_MSG_CHECKING([if compiler accepts optimizer enabling options])
tmp_options="$flags_opt_yes"
fi
if test "$want_optimize" = "no"; then
AC_MSG_CHECKING([if compiler accepts optimizer disabling options])
tmp_options="$flags_opt_off"
fi
if test "$flags_prefer_cppflags" = "yes"; then
CPPFLAGS="$tmp_CPPFLAGS $tmp_options"
CFLAGS="$tmp_CFLAGS"
else
CPPFLAGS="$tmp_CPPFLAGS"
CFLAGS="$tmp_CFLAGS $tmp_options"
fi
squeeze CPPFLAGS
squeeze CFLAGS
CURL_COMPILER_WORKS_IFELSE([
AC_MSG_RESULT([yes])
AC_MSG_NOTICE([compiler options added: $tmp_options])
],[
AC_MSG_RESULT([no])
AC_MSG_WARN([compiler options rejected: $tmp_options])
dnl restore initial settings
CPPFLAGS="$tmp_save_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS"
])
fi
#
fi
])
dnl CURL_SET_COMPILER_WARNING_OPTS
dnl -------------------------------------------------
dnl Sets compiler options/flags which depend on
dnl configure's warnings given option.
AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
AC_REQUIRE([CURL_CHECK_OPTION_WARNINGS])dnl
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
#
if test "$compiler_id" != "unknown"; then
#
tmp_save_CPPFLAGS="$CPPFLAGS"
tmp_save_CFLAGS="$CFLAGS"
tmp_CPPFLAGS=""
tmp_CFLAGS=""
#
case "$compiler_id" in
#
CLANG)
#
if test "$want_warnings" = "yes"; then
tmp_CFLAGS="$tmp_CFLAGS -pedantic"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [all extra])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [pointer-arith write-strings])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [shadow])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [inline nested-externs])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-declarations])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-prototypes])
tmp_CFLAGS="$tmp_CFLAGS -Wno-long-long"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [float-equal])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [no-multichar sign-compare])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [undef])
tmp_CFLAGS="$tmp_CFLAGS -Wno-format-nonliteral"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [endif-labels strict-prototypes])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [declaration-after-statement])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [cast-align])
tmp_CFLAGS="$tmp_CFLAGS -Wno-system-headers"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [shorten-64-to-32])
#
dnl Only clang 1.1 or later
if test "$compiler_num" -ge "101"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [unused])
fi
#
dnl Only clang 2.8 or later
if test "$compiler_num" -ge "208"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [vla])
fi
#
dnl Only clang 2.9 or later
if test "$compiler_num" -ge "209"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [shift-sign-overflow])
fi
#
dnl Only clang 3.2 or later
if test "$compiler_num" -ge "302"; then
case $host_os in
cygwin* | mingw*)
dnl skip missing-variable-declarations warnings for cygwin and
dnl mingw because the libtool wrapper executable causes them
;;
*)
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-variable-declarations])
;;
esac
fi
#
dnl Only clang 3.6 or later
if test "$compiler_num" -ge "306"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [double-promotion])
fi
#
dnl Only clang 3.9 or later
if test "$compiler_num" -ge "309"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [comma])
# avoid the varargs warning, fixed in 4.0
# https://bugs.llvm.org/show_bug.cgi?id=29140
if test "$compiler_num" -lt "400"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-varargs"
fi
fi
fi
;;
#
DEC_C)
#
if test "$want_warnings" = "yes"; then
dnl Select a higher warning level than default level2
tmp_CFLAGS="$tmp_CFLAGS -msg_enable level3"
fi
;;
#
GNU_C)
#
if test "$want_warnings" = "yes"; then
#
dnl Do not enable -pedantic when cross-compiling with a gcc older
dnl than 3.0, to avoid warnings from third party system headers.
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
tmp_CFLAGS="$tmp_CFLAGS -pedantic"
fi
#
dnl Set of options we believe *ALL* gcc versions support:
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [all])
tmp_CFLAGS="$tmp_CFLAGS -W"
#
dnl Only gcc 1.4 or later
if test "$compiler_num" -ge "104"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [pointer-arith write-strings])
dnl If not cross-compiling with a gcc older than 3.0
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [unused shadow])
fi
fi
#
dnl Only gcc 2.7 or later
if test "$compiler_num" -ge "207"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [inline nested-externs])
dnl If not cross-compiling with a gcc older than 3.0
if test "x$cross_compiling" != "xyes" ||
test "$compiler_num" -ge "300"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-declarations])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-prototypes])
fi
fi
#
dnl Only gcc 2.95 or later
if test "$compiler_num" -ge "295"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-long-long"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [bad-function-cast])
fi
#
dnl Only gcc 2.96 or later
if test "$compiler_num" -ge "296"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [float-equal])
tmp_CFLAGS="$tmp_CFLAGS -Wno-multichar"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [sign-compare])
dnl -Wundef used only if gcc is 2.96 or later since we get
dnl lots of "`_POSIX_C_SOURCE' is not defined" in system
dnl headers with gcc 2.95.4 on FreeBSD 4.9
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [undef])
fi
#
dnl Only gcc 2.97 or later
if test "$compiler_num" -ge "297"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-format-nonliteral"
fi
#
dnl Only gcc 3.0 or later
if test "$compiler_num" -ge "300"; then
dnl -Wunreachable-code seems totally unreliable on my gcc 3.3.2 on
dnl on i686-Linux as it gives us heaps with false positives.
dnl Also, on gcc 4.0.X it is totally unbearable and complains all
dnl over making it unusable for generic purposes. Let's not use it.
tmp_CFLAGS="$tmp_CFLAGS"
fi
#
dnl Only gcc 3.3 or later
if test "$compiler_num" -ge "303"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [endif-labels strict-prototypes])
fi
#
dnl Only gcc 3.4 or later
if test "$compiler_num" -ge "304"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [declaration-after-statement])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [old-style-definition])
fi
#
dnl Only gcc 4.0 or later
if test "$compiler_num" -ge "400"; then
tmp_CFLAGS="$tmp_CFLAGS -Wstrict-aliasing=3"
fi
#
dnl Only gcc 4.2 or later
if test "$compiler_num" -ge "402"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [cast-align])
fi
#
dnl Only gcc 4.3 or later
if test "$compiler_num" -ge "403"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [type-limits old-style-declaration])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [missing-parameter-type empty-body])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [clobbered ignored-qualifiers])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [conversion])
tmp_CFLAGS="$tmp_CFLAGS -Wno-sign-conversion"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [vla])
dnl required for -Warray-bounds, included in -Wall
tmp_CFLAGS="$tmp_CFLAGS -ftree-vrp"
fi
#
dnl Only gcc 4.5 or later
if test "$compiler_num" -ge "405"; then
dnl Only windows targets
if test "$curl_cv_have_def__WIN32" = "yes"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-pedantic-ms-format"
fi
fi
#
dnl Only gcc 4.6 or later
if test "$compiler_num" -ge "406"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [double-promotion])
fi
#
dnl only gcc 4.8 or later
if test "$compiler_num" -ge "408"; then
tmp_CFLAGS="$tmp_CFLAGS -Wformat=2"
fi
#
dnl Only gcc 5 or later
if test "$compiler_num" -ge "500"; then
tmp_CFLAGS="$tmp_CFLAGS -Warray-bounds=2"
fi
#
dnl Only gcc 6 or later
if test "$compiler_num" -ge "600"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [shift-negative-value])
tmp_CFLAGS="$tmp_CFLAGS -Wshift-overflow=2"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [null-dereference])
tmp_CFLAGS="$tmp_CFLAGS -fdelete-null-pointer-checks"
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [duplicated-cond])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [unused-const-variable])
fi
#
dnl Only gcc 7 or later
if test "$compiler_num" -ge "700"; then
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [duplicated-branches])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [restrict])
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [alloc-zero])
tmp_CFLAGS="$tmp_CFLAGS -Wformat-overflow=2"
tmp_CFLAGS="$tmp_CFLAGS -Wformat-truncation=2"
tmp_CFLAGS="$tmp_CFLAGS -Wimplicit-fallthrough=4"
fi
#
fi
#
dnl Do not issue warnings for code in system include paths.
if test "$compiler_num" -ge "300"; then
tmp_CFLAGS="$tmp_CFLAGS -Wno-system-headers"
else
dnl When cross-compiling with a gcc older than 3.0, disable
dnl some warnings triggered on third party system headers.
if test "x$cross_compiling" = "xyes"; then
if test "$compiler_num" -ge "104"; then
dnl gcc 1.4 or later
tmp_CFLAGS="$tmp_CFLAGS -Wno-unused -Wno-shadow"
fi
if test "$compiler_num" -ge "207"; then
dnl gcc 2.7 or later
tmp_CFLAGS="$tmp_CFLAGS -Wno-missing-declarations"
tmp_CFLAGS="$tmp_CFLAGS -Wno-missing-prototypes"
fi
fi
fi
;;
#
HP_UX_C)
#
if test "$want_warnings" = "yes"; then
dnl Issue all warnings
tmp_CFLAGS="$tmp_CFLAGS +w1"
fi
;;
#
IBM_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
INTEL_UNIX_C)
#
if test "$want_warnings" = "yes"; then
if test "$compiler_num" -gt "600"; then
dnl Show errors, warnings, and remarks
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wall -w2"
dnl Perform extra compile-time code checking
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wcheck"
dnl Warn on nested comments
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wcomment"
dnl Show warnings relative to deprecated features
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wdeprecated"
dnl Enable warnings for missing prototypes
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wmissing-prototypes"
dnl Enable warnings for 64-bit portability issues
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wp64"
dnl Enable warnings for questionable pointer arithmetic
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wpointer-arith"
dnl Check for function return typw issues
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wreturn-type"
dnl Warn on variable declarations hiding a previous one
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wshadow"
dnl Warn when a variable is used before initialized
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wuninitialized"
dnl Warn if a declared function is not used
tmp_CPPFLAGS="$tmp_CPPFLAGS -Wunused-function"
fi
fi
dnl Disable using EBP register in optimizations
tmp_CFLAGS="$tmp_CFLAGS -fno-omit-frame-pointer"
dnl Disable use of ANSI C aliasing rules in optimizations
tmp_CFLAGS="$tmp_CFLAGS -fno-strict-aliasing"
dnl Value-safe optimizations on floating-point data
tmp_CFLAGS="$tmp_CFLAGS -fp-model precise"
;;
#
INTEL_WINDOWS_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
LCC)
#
if test "$want_warnings" = "yes"; then
dnl Highest warning level is double -A, next is single -A.
dnl Due to the big number of warnings these trigger on third
dnl party header files it is impractical for us to use any of
dnl them here. If you want them simply define it in CPPFLAGS.
tmp_CFLAGS="$tmp_CFLAGS"
fi
;;
#
SGI_MIPS_C)
#
if test "$want_warnings" = "yes"; then
dnl Perform stricter semantic and lint-like checks
tmp_CFLAGS="$tmp_CFLAGS -fullwarn"
fi
;;
#
SGI_MIPSPRO_C)
#
if test "$want_warnings" = "yes"; then
dnl Perform stricter semantic and lint-like checks
tmp_CFLAGS="$tmp_CFLAGS -fullwarn"
dnl Disable some remarks
dnl #1209: controlling expression is constant
tmp_CFLAGS="$tmp_CFLAGS -woff 1209"
fi
;;
#
SUNPRO_C)
#
if test "$want_warnings" = "yes"; then
dnl Perform stricter semantic and lint-like checks
tmp_CFLAGS="$tmp_CFLAGS -v"
fi
;;
#
TINY_C)
#
if test "$want_warnings" = "yes"; then
dnl Activate all warnings
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [all])
dnl Make string constants be of type const char *
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [write-strings])
dnl Warn use of unsupported GCC features ignored by TCC
CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [unsupported])
fi
;;
#
WATCOM_UNIX_C)
#
if test "$want_warnings" = "yes"; then
dnl Issue all warnings
tmp_CFLAGS="$tmp_CFLAGS -Wall -Wextra"
fi
;;
#
WATCOM_WINDOWS_C)
#
dnl Placeholder
tmp_CFLAGS="$tmp_CFLAGS"
;;
#
esac
#
squeeze tmp_CPPFLAGS
squeeze tmp_CFLAGS
#
if test ! -z "$tmp_CFLAGS" || test ! -z "$tmp_CPPFLAGS"; then
AC_MSG_CHECKING([if compiler accepts strict warning options])
CPPFLAGS="$tmp_save_CPPFLAGS $tmp_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS $tmp_CFLAGS"
squeeze CPPFLAGS
squeeze CFLAGS
CURL_COMPILER_WORKS_IFELSE([
AC_MSG_RESULT([yes])
AC_MSG_NOTICE([compiler options added: $tmp_CFLAGS $tmp_CPPFLAGS])
],[
AC_MSG_RESULT([no])
AC_MSG_WARN([compiler options rejected: $tmp_CFLAGS $tmp_CPPFLAGS])
dnl restore initial settings
CPPFLAGS="$tmp_save_CPPFLAGS"
CFLAGS="$tmp_save_CFLAGS"
])
fi
#
fi
])
dnl CURL_SHFUNC_SQUEEZE
dnl -------------------------------------------------
dnl Declares a shell function squeeze() which removes
dnl redundant whitespace out of a shell variable.
AC_DEFUN([CURL_SHFUNC_SQUEEZE], [
squeeze() {
_sqz_result=""
eval _sqz_input=\[$][$]1
for _sqz_token in $_sqz_input; do
if test -z "$_sqz_result"; then
_sqz_result="$_sqz_token"
else
_sqz_result="$_sqz_result $_sqz_token"
fi
done
eval [$]1=\$_sqz_result
return 0
}
])
dnl CURL_CHECK_CURLDEBUG
dnl -------------------------------------------------
dnl Settings which depend on configure's curldebug given
dnl option, and other additional configure pre-requisites.
dnl Actually the curl debug memory tracking feature can
dnl only be used/enabled when libcurl is built as a static
dnl library or as a shared one on those systems on which
dnl shared libraries support undefined symbols.
AC_DEFUN([CURL_CHECK_CURLDEBUG], [
AC_REQUIRE([XC_LIBTOOL])dnl
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
supports_curldebug="unknown"
if test "$want_curldebug" = "yes"; then
if test "x$enable_shared" != "xno" &&
test "x$enable_shared" != "xyes"; then
AC_MSG_WARN([unknown enable_shared setting.])
supports_curldebug="no"
fi
if test "x$enable_static" != "xno" &&
test "x$enable_static" != "xyes"; then
AC_MSG_WARN([unknown enable_static setting.])
supports_curldebug="no"
fi
if test "$supports_curldebug" != "no"; then
if test "$enable_shared" = "yes" &&
test "x$xc_lt_shlib_use_no_undefined" = 'xyes'; then
supports_curldebug="no"
AC_MSG_WARN([shared library does not support undefined symbols.])
fi
fi
fi
#
if test "$want_curldebug" = "yes"; then
AC_MSG_CHECKING([if curl debug memory tracking can be enabled])
test "$supports_curldebug" = "no" || supports_curldebug="yes"
AC_MSG_RESULT([$supports_curldebug])
if test "$supports_curldebug" = "no"; then
AC_MSG_WARN([cannot enable curl debug memory tracking.])
want_curldebug="no"
fi
fi
])
dnl CURL_CHECK_COMPILER_HALT_ON_ERROR
dnl -------------------------------------------------
dnl Verifies if the compiler actually halts after the
dnl compilation phase without generating any object
dnl code file, when the source compiles with errors.
AC_DEFUN([CURL_CHECK_COMPILER_HALT_ON_ERROR], [
AC_MSG_CHECKING([if compiler halts on compilation errors])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
]],[[
force compilation error
]])
],[
AC_MSG_RESULT([no])
AC_MSG_ERROR([compiler does not halt on compilation errors.])
],[
AC_MSG_RESULT([yes])
])
])
dnl CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE
dnl -------------------------------------------------
dnl Verifies if the compiler actually halts after the
dnl compilation phase without generating any object
dnl code file, when the source code tries to define a
dnl type for a constant array with negative dimension.
AC_DEFUN([CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE], [
AC_REQUIRE([CURL_CHECK_COMPILER_HALT_ON_ERROR])dnl
AC_MSG_CHECKING([if compiler halts on negative sized arrays])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
typedef char bad_t[sizeof(char) == sizeof(int) ? -1 : -1 ];
]],[[
bad_t dummy;
]])
],[
AC_MSG_RESULT([no])
AC_MSG_ERROR([compiler does not halt on negative sized arrays.])
],[
AC_MSG_RESULT([yes])
])
])
dnl CURL_CHECK_COMPILER_STRUCT_MEMBER_SIZE
dnl -------------------------------------------------
dnl Verifies if the compiler is capable of handling the
dnl size of a struct member, struct which is a function
dnl result, as a compilation-time condition inside the
dnl type definition of a constant array.
AC_DEFUN([CURL_CHECK_COMPILER_STRUCT_MEMBER_SIZE], [
AC_REQUIRE([CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE])dnl
AC_MSG_CHECKING([if compiler struct member size checking works])
tst_compiler_check_one_works="unknown"
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
struct mystruct {
int mi;
char mc;
struct mystruct *next;
};
struct mystruct myfunc();
typedef char good_t1[sizeof(myfunc().mi) == sizeof(int) ? 1 : -1 ];
typedef char good_t2[sizeof(myfunc().mc) == sizeof(char) ? 1 : -1 ];
]],[[
good_t1 dummy1;
good_t2 dummy2;
]])
],[
tst_compiler_check_one_works="yes"
],[
tst_compiler_check_one_works="no"
sed 's/^/cc-src: /' conftest.$ac_ext >&6
sed 's/^/cc-err: /' conftest.err >&6
])
tst_compiler_check_two_works="unknown"
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
struct mystruct {
int mi;
char mc;
struct mystruct *next;
};
struct mystruct myfunc();
typedef char bad_t1[sizeof(myfunc().mi) != sizeof(int) ? 1 : -1 ];
typedef char bad_t2[sizeof(myfunc().mc) != sizeof(char) ? 1 : -1 ];
]],[[
bad_t1 dummy1;
bad_t2 dummy2;
]])
],[
tst_compiler_check_two_works="no"
],[
tst_compiler_check_two_works="yes"
])
if test "$tst_compiler_check_one_works" = "yes" &&
test "$tst_compiler_check_two_works" = "yes"; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
AC_MSG_ERROR([compiler fails struct member size checking.])
fi
])
dnl CURL_CHECK_COMPILER_SYMBOL_HIDING
dnl -------------------------------------------------
dnl Verify if compiler supports hiding library internal symbols, setting
dnl shell variable supports_symbol_hiding value as appropriate, as well as
dnl variables symbol_hiding_CFLAGS and symbol_hiding_EXTERN when supported.
AC_DEFUN([CURL_CHECK_COMPILER_SYMBOL_HIDING], [
AC_REQUIRE([CURL_CHECK_COMPILER])dnl
AC_BEFORE([$0],[CURL_CONFIGURE_SYMBOL_HIDING])dnl
AC_MSG_CHECKING([if compiler supports hiding library internal symbols])
supports_symbol_hiding="no"
symbol_hiding_CFLAGS=""
symbol_hiding_EXTERN=""
tmp_CFLAGS=""
tmp_EXTERN=""
case "$compiler_id" in
CLANG)
dnl All versions of clang support -fvisibility=
tmp_EXTERN="__attribute__ ((__visibility__ (\"default\")))"
tmp_CFLAGS="-fvisibility=hidden"
supports_symbol_hiding="yes"
;;
GNU_C)
dnl Only gcc 3.4 or later
if test "$compiler_num" -ge "304"; then
if $CC --help --verbose 2>/dev/null | grep fvisibility= >/dev/null ; then
tmp_EXTERN="__attribute__ ((__visibility__ (\"default\")))"
tmp_CFLAGS="-fvisibility=hidden"
supports_symbol_hiding="yes"
fi
fi
;;
INTEL_UNIX_C)
dnl Only icc 9.0 or later
if test "$compiler_num" -ge "900"; then
if $CC --help --verbose 2>&1 | grep fvisibility= > /dev/null ; then
tmp_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=hidden"
AC_LINK_IFELSE([
AC_LANG_PROGRAM([[
# include <stdio.h>
]],[[
printf("icc fvisibility bug test");
]])
],[
tmp_EXTERN="__attribute__ ((__visibility__ (\"default\")))"
tmp_CFLAGS="-fvisibility=hidden"
supports_symbol_hiding="yes"
])
CFLAGS="$tmp_save_CFLAGS"
fi
fi
;;
SUNPRO_C)
if $CC 2>&1 | grep flags >/dev/null && $CC -flags | grep xldscope= >/dev/null ; then
tmp_EXTERN="__global"
tmp_CFLAGS="-xldscope=hidden"
supports_symbol_hiding="yes"
fi
;;
esac
if test "$supports_symbol_hiding" = "yes"; then
tmp_save_CFLAGS="$CFLAGS"
CFLAGS="$tmp_save_CFLAGS $tmp_CFLAGS"
squeeze CFLAGS
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
$tmp_EXTERN char *dummy(char *buff);
char *dummy(char *buff)
{
if(buff)
return ++buff;
else
return buff;
}
]],[[
char b[16];
char *r = dummy(&b[0]);
if(r)
return (int)*r;
]])
],[
supports_symbol_hiding="yes"
if test -f conftest.err; then
grep 'visibility' conftest.err >/dev/null
if test "$?" -eq "0"; then
supports_symbol_hiding="no"
fi
fi
],[
supports_symbol_hiding="no"
echo " " >&6
sed 's/^/cc-src: /' conftest.$ac_ext >&6
sed 's/^/cc-err: /' conftest.err >&6
echo " " >&6
])
CFLAGS="$tmp_save_CFLAGS"
fi
if test "$supports_symbol_hiding" = "yes"; then
AC_MSG_RESULT([yes])
symbol_hiding_CFLAGS="$tmp_CFLAGS"
symbol_hiding_EXTERN="$tmp_EXTERN"
else
AC_MSG_RESULT([no])
fi
])
dnl CURL_CHECK_COMPILER_PROTOTYPE_MISMATCH
dnl -------------------------------------------------
dnl Verifies if the compiler actually halts after the
dnl compilation phase without generating any object
dnl code file, when the source code tries to redefine
dnl a prototype which does not match previous one.
AC_DEFUN([CURL_CHECK_COMPILER_PROTOTYPE_MISMATCH], [
AC_REQUIRE([CURL_CHECK_COMPILER_HALT_ON_ERROR])dnl
AC_MSG_CHECKING([if compiler halts on function prototype mismatch])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
# include <stdlib.h>
int rand(int n);
int rand(int n)
{
if(n)
return ++n;
else
return n;
}
]],[[
int i[2]={0,0};
int j = rand(i[0]);
if(j)
return j;
]])
],[
AC_MSG_RESULT([no])
AC_MSG_ERROR([compiler does not halt on function prototype mismatch.])
],[
AC_MSG_RESULT([yes])
])
])
dnl CURL_VAR_MATCH (VARNAME, VALUE)
dnl -------------------------------------------------
dnl Verifies if shell variable VARNAME contains VALUE.
dnl Contents of variable VARNAME and VALUE are handled
dnl as whitespace separated lists of words. If at least
dnl one word of VALUE is present in VARNAME the match
dnl is considered positive, otherwise false.
AC_DEFUN([CURL_VAR_MATCH], [
ac_var_match_word="no"
for word1 in $[$1]; do
for word2 in [$2]; do
if test "$word1" = "$word2"; then
ac_var_match_word="yes"
fi
done
done
])
dnl CURL_VAR_MATCH_IFELSE (VARNAME, VALUE,
dnl [ACTION-IF-MATCH], [ACTION-IF-NOT-MATCH])
dnl -------------------------------------------------
dnl This performs a CURL_VAR_MATCH check and executes
dnl first branch if the match is positive, otherwise
dnl the second branch is executed.
AC_DEFUN([CURL_VAR_MATCH_IFELSE], [
CURL_VAR_MATCH([$1],[$2])
if test "$ac_var_match_word" = "yes"; then
ifelse($3,,:,[$3])
ifelse($4,,,[else
$4])
fi
])
dnl CURL_VAR_STRIP (VARNAME, VALUE)
dnl -------------------------------------------------
dnl Contents of variable VARNAME and VALUE are handled
dnl as whitespace separated lists of words. Each word
dnl from VALUE is removed from VARNAME when present.
AC_DEFUN([CURL_VAR_STRIP], [
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
ac_var_stripped=""
for word1 in $[$1]; do
ac_var_strip_word="no"
for word2 in [$2]; do
if test "$word1" = "$word2"; then
ac_var_strip_word="yes"
fi
done
if test "$ac_var_strip_word" = "no"; then
ac_var_stripped="$ac_var_stripped $word1"
fi
done
dnl squeeze whitespace out of result
[$1]="$ac_var_stripped"
squeeze [$1]
])
dnl CURL_ADD_COMPILER_WARNINGS (WARNING-LIST, NEW-WARNINGS)
dnl -------------------------------------------------------
dnl Contents of variable WARNING-LIST and NEW-WARNINGS are
dnl handled as whitespace separated lists of words.
dnl Add each compiler warning from NEW-WARNINGS that has not
dnl been disabled via CFLAGS to WARNING-LIST.
AC_DEFUN([CURL_ADD_COMPILER_WARNINGS], [
AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
ac_var_added_warnings=""
for warning in [$2]; do
CURL_VAR_MATCH(CFLAGS, [-Wno-$warning -W$warning])
if test "$ac_var_match_word" = "no"; then
ac_var_added_warnings="$ac_var_added_warnings -W$warning"
fi
done
dnl squeeze whitespace out of result
[$1]="$[$1] $ac_var_added_warnings"
squeeze [$1]
])
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