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conftools: Use -Werror when checking compile flags

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Sebastian Pipping 2020-03-17 00:14:18 +01:00
parent ef1f2a1931
commit 21381bf35e
2 changed files with 7 additions and 4 deletions
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2
expat/Changes
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@ -5,6 +5,8 @@ NOTE: We are looking for help with a few things:
Release x.x.x xxx xxxxxxxxx xx xxxx
Other changes:
#396 Windows: Drop support for Visual Studio <=8.0/2005
#383 #392 Autotools: Use -Werror while configure tests the compiler
for supported compile flags to avoid false positives
#383 #393 Autotools: Improve handling of user (C|CPP|CXX|LD)FLAGS,
e.g. ensure that they have the last word over flags added
while running ./configure

9
expat/conftools/ax-check-compile-flag.m4
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@ -8,8 +8,8 @@
#
# DESCRIPTION
#
# Check whether the given FLAG works with the current language's compiler
# or gives an error. (Warnings, however, are ignored)
# Check whether the given FLAG plus -Werror works with the current
# language's compiler or gives an error.
#
# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
# success/failure.
@ -28,6 +28,7 @@
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
# Copyright (c) 2020 Sebastian Pipping <sebastian@pipping.org>
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
@ -55,14 +56,14 @@
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 4
#serial 5
AC_DEFUN([AX_CHECK_COMPILE_FLAG],
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 -Werror $1"
AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
[AS_VAR_SET(CACHEVAR,[yes])],
[AS_VAR_SET(CACHEVAR,[no])])