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pacman/acinclude.m4
Allan McRae 81dd9d3ebc Detect undefined PATH_MAX
POSIX does not require PATH_MAX be defined when there is not actual
limit to its value.  This affects HURD based systems.  Work around
this by defining PATH_MAX to 4096 (as on Linux) when this is not
defined.

Also, clean up inclusions of limits.h and remove autoconf check for
this header as we do not use macro shields for its inclusion anyway.

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>
2010-12-29 19:24:13 -06:00

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dnl acinclude.m4 - configure macros used by pacman and libalpm
dnl Add some custom macros for pacman and libalpm
dnl GCC_STACK_PROTECT_LIB
dnl adds -lssp to LIBS if it is available
dnl ssp is usually provided as part of libc, but was previously a separate lib
dnl It does not hurt to add -lssp even if libc provides SSP - in that case
dnl libssp will simply be ignored.
AC_DEFUN([GCC_STACK_PROTECT_LIB],[
AC_CACHE_CHECK([whether libssp exists], ssp_cv_lib,
[ssp_old_libs="$LIBS"
LIBS="$LIBS -lssp"
AC_TRY_LINK(,, ssp_cv_lib=yes, ssp_cv_lib=no)
LIBS="$ssp_old_libs"
])
if test $ssp_cv_lib = yes; then
LIBS="$LIBS -lssp"
fi
])
dnl GCC_STACK_PROTECT_CC
dnl checks -fstack-protector-all with the C compiler, if it exists then updates
dnl CFLAGS and defines ENABLE_SSP_CC
AC_DEFUN([GCC_STACK_PROTECT_CC],[
AC_LANG_ASSERT(C)
if test "X$CC" != "X"; then
AC_CACHE_CHECK([whether ${CC} accepts -fstack-protector-all],
ssp_cv_cc,
[ssp_old_cflags="$CFLAGS"
CFLAGS="$CFLAGS -fstack-protector-all"
AC_TRY_COMPILE(,, ssp_cv_cc=yes, ssp_cv_cc=no)
CFLAGS="$ssp_old_cflags"
])
if test $ssp_cv_cc = yes; then
CFLAGS="$CFLAGS -fstack-protector-all"
AC_DEFINE([ENABLE_SSP_CC], 1, [Define if SSP C support is enabled.])
fi
fi
])
dnl GCC_FORTIFY_SOURCE_CC
dnl checks -D_FORTIFY_SOURCE with the C compiler, if it exists then updates
dnl CFLAGS
AC_DEFUN([GCC_FORTIFY_SOURCE_CC],[
AC_LANG_ASSERT(C)
if test "X$CC" != "X"; then
AC_MSG_CHECKING(for FORTIFY_SOURCE support)
AC_TRY_COMPILE([#include <features.h>], [
int main() {
#if !(__GNUC_PREREQ (4, 1) )
#error No FORTIFY_SOURCE support
#endif
return 0;
}
], [
AC_MSG_RESULT(yes)
CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
], [
AC_MSG_RESULT(no)
])
fi
])
dnl GCC_VISIBILITY_CC
dnl checks -fvisibility=internal with the C compiler, if it exists then
dnl defines ENABLE_VISIBILITY_CC in both configure script and Makefiles
AC_DEFUN([GCC_VISIBILITY_CC],[
AC_LANG_ASSERT(C)
if test "X$CC" != "X"; then
AC_CACHE_CHECK([whether ${CC} accepts -fvisibility=internal],
visibility_cv_cc,
[visibility_old_cflags="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=internal"
AC_TRY_COMPILE(,, visibility_cv_cc=yes, visibility_cv_cc=no)
CFLAGS="$visibility_old_cflags"
])
if test $visibility_cv_cc = yes; then
AC_DEFINE([ENABLE_VISIBILITY_CC], 1, [Define if symbol visibility C support is enabled.])
fi
AM_CONDITIONAL([ENABLE_VISIBILITY_CC], test "x$visibility_cv_cc" = "xyes")
fi
])
dnl GCC_GNU89_INLINE_CC
dnl checks -fgnu89-inline with the C compiler, if it exists then defines
dnl ENABLE_GNU89_INLINE_CC in both configure script and Makefiles
AC_DEFUN([GCC_GNU89_INLINE_CC],[
AC_LANG_ASSERT(C)
if test "X$CC" != "X"; then
AC_CACHE_CHECK([for -fgnu89-inline],
gnu89_inline_cv_cc,
[ gnu89_inline_old_cflags="$CFLAGS"
CFLAGS="$CFLAGS -fgnu89-inline"
AC_TRY_COMPILE(,, gnu89_inline_cv_cc=yes, gnu89_inline_cv_cc=no)
CFLAGS="$gnu89_inline_old_cflags"
])
if test $gnu89_inline_cv_cc = yes; then
AC_DEFINE([ENABLE_GNU89_INLINE_CC], 1, [Define if gnu89 inlining semantics should be used.])
fi
AM_CONDITIONAL([ENABLE_GNU89_INLINE_CC], test "x$gnu89_inline_cv_cc" = "xyes")
fi
])
dnl Checks for getmntinfo and determines whether it uses statfs or statvfs
AC_DEFUN([FS_STATS_TYPE],
[AC_CACHE_CHECK([filesystem statistics type], fs_stats_cv_type,
[AC_CHECK_FUNC(getmntinfo,
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
# include <sys/param.h>
# include <sys/mount.h>
#if HAVE_SYS_UCRED_H
#include <sys/ucred.h>
#endif
extern int getmntinfo (struct statfs **, int);
]],
[])],
[fs_stats_cv_type="struct statfs"],
[fs_stats_cv_type="struct statvfs"])],
[AC_CHECK_FUNC(getmntent,
[fs_stats_cv_type="struct statvfs"])]
)]
)
AC_DEFINE_UNQUOTED(FSSTATSTYPE, [$fs_stats_cv_type],
[Defined as the filesystem stats type ('statvfs' or 'statfs')])
])
dnl Checks for PATH_MAX and defines it if not present
AC_DEFUN([PATH_MAX_DEFINED],
[AC_CACHE_CHECK([PATH_MAX defined], path_max_cv_defined,
[AC_EGREP_CPP(yes, [[
#include <limits.h>
#if defined(PATH_MAX)
yes
#endif
]],
[path_max_cv_defined=yes],
[path_max_cv_defined=no])]
)
if test $path_max_cv_defined = no; then
AC_DEFINE([PATH_MAX], 4096, [Define if PATH_MAX is undefined by limits.h.])
fi
])