mirror of
https://github.com/moparisthebest/curl
synced 2024-08-13 17:03:50 -04:00
efe4656656
Notes: When running a configure script that has nested packages (for example libcurl's configure with --enable-ares and c-ares sources embedded in curl tree) and AC_CONFIG_SUBDIRS([nested-subdir]) machinery is used to automatically run the nested configure script from within the parent configure script, it happens that the nested _shell_ script will inherit shell variables exported from the parent _shell_ script. If for example parent configure script sets and exports LDFLAGS and LIBS variables with proper values in order to link either a parent library or program with a library which will be configured and built by a nested package; It will happen that when the nested configure script runs, the nested library does not exist yet and _any_ link-test done in the nested configure will fail, such as those that autoconf macros perform in order to detect existing compiler and its characteristics, the result is that the nested configure script will fail with errors such as: configure: error: C compiler cannot create executables For now, we no longer export variables previously exported here. On the other hand, AC_SUBST'ing them is appropriate and even with nested packages each package's config.status gets its own package values. So we reinstate AC_SUBST'ing previously AC_SUBST'ed variables.
97 lines
2.9 KiB
Plaintext
97 lines
2.9 KiB
Plaintext
#---------------------------------------------------------------------------
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#
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# xc-cc-check.m4
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#
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# Copyright (c) 2013 Daniel Stenberg <daniel@haxx.se>
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#
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# Permission to use, copy, modify, and distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#
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#---------------------------------------------------------------------------
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# serial 1
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dnl _XC_PROG_CC_PREAMBLE
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dnl -------------------------------------------------
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dnl Private macro.
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AC_DEFUN([_XC_PROG_CC_PREAMBLE], [
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xc_prog_cc_prev_IFS=$IFS
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xc_prog_cc_prev_LIBS=$LIBS
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xc_prog_cc_prev_CFLAGS=$CFLAGS
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xc_prog_cc_prev_LDFLAGS=$LDFLAGS
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xc_prog_cc_prev_CPPFLAGS=$CPPFLAGS
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])
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dnl _XC_PROG_CC_POSTLUDE
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dnl -------------------------------------------------
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dnl Private macro.
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AC_DEFUN([_XC_PROG_CC_POSTLUDE], [
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IFS=$xc_prog_cc_prev_IFS
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LIBS=$xc_prog_cc_prev_LIBS
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CFLAGS=$xc_prog_cc_prev_CFLAGS
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LDFLAGS=$xc_prog_cc_prev_LDFLAGS
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CPPFLAGS=$xc_prog_cc_prev_CPPFLAGS
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AC_SUBST([CC])dnl
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AC_SUBST([CPP])dnl
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AC_SUBST([LIBS])dnl
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AC_SUBST([CFLAGS])dnl
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AC_SUBST([LDFLAGS])dnl
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AC_SUBST([CPPFLAGS])dnl
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])
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dnl _XC_PROG_CC
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dnl -------------------------------------------------
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dnl Private macro.
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AC_DEFUN([_XC_PROG_CC], [
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AC_REQUIRE([_XC_PROG_CC_PREAMBLE])dnl
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AC_REQUIRE([XC_CHECK_USER_FLAGS])dnl
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AC_REQUIRE([AC_PROG_INSTALL])dnl
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AC_REQUIRE([AC_PROG_CC])dnl
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AC_REQUIRE([AM_PROG_CC_C_O])dnl
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AC_REQUIRE([AC_PROG_CPP])dnl
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AC_REQUIRE([_XC_PROG_CC_POSTLUDE])dnl
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])
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dnl XC_CHECK_PROG_CC
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dnl -------------------------------------------------
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dnl Public macro.
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dnl
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dnl Checks for C compiler and C preprocessor programs,
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dnl while doing some previous sanity validation on user
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dnl provided LIBS, LDFLAGS, CPPFLAGS and CFLAGS values
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dnl that must succeed in order to continue execution.
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dnl
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dnl This sets variables CC and CPP, while preventing
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dnl LIBS, LDFLAGS, CFLAGS, CPPFLAGS and IFS from being
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dnl unexpectedly changed by underlying macros.
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AC_DEFUN([XC_CHECK_PROG_CC], [
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AC_PREREQ([2.50])dnl
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AC_BEFORE([$0],[_XC_PROG_CC_PREAMBLE])dnl
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AC_BEFORE([$0],[AC_PROG_INSTALL])dnl
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AC_BEFORE([$0],[AC_PROG_CC])dnl
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AC_BEFORE([$0],[AM_PROG_CC_C_O])dnl
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AC_BEFORE([$0],[AC_PROG_CPP])dnl
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AC_BEFORE([$0],[AC_PROG_LIBTOOL])dnl
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AC_BEFORE([$0],[AM_INIT_AUTOMAKE])dnl
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AC_BEFORE([$0],[_XC_PROG_CC_POSTLUDE])dnl
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AC_REQUIRE([_XC_PROG_CC])dnl
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])
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