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# SYNOPSIS
#
# AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-IF-WORKS], [ACTION-IF-FAILS])
#
# DESCRIPTION
#
# Check whether the current compiler supports a given set of flags,
# cache the result, and update xxFLAGS.
#
# Note: in principle I'd better use AC_COMPILE_IFELSE([AC_LANG_PROGRAM()])
# but I don't remember whether it works well when using multiple flags.
# I find it also safer to inspect stderr using a regular expression.
# For safety, the compiler is checked with and without the tested flags
# and the corresponding standard error outputs are compared.
#
# LAST MODIFICATION
#
# 2007-11-08
#
# COPYLEFT
#
# Copyright (c) 2006 Nicolas Calimet
#
# Copying and distribution of this file, with or without
# modification, are permitted in any medium without royalty provided
# the copyright notice and this notice are preserved.
AC_DEFUN([AX_TEST_COMPILER_FLAGS],
[
AC_PREREQ(2.59)
AC_REQUIRE([AC_PROG_EGREP])
# Create a unique cache-id name (multiple flags are handled).
ax_test_compiler_flags_var=ax_cv_test_[]_AC_LANG_ABBREV[]_flags`echo $1 | sed 's,[[^a-zA-Z0-9]],_,g'`
# Create the extended regular expression to handle multiple flags.
# For instance, "-first-flag -second-flag -X" gives the regexp:
# "\-f|irst-flag|\-s|econd-flag|\-X|X"
#
# FreeBSD and Darwin seem to have a problem with the \+ sed construct
# (but apparently not with the \{x,y\} one). For safety, I prefer to
# use [[:space:]][[:space:]]* for [[:space:]]\+
ax_test_compiler_flags_regexp=`echo $1 | sed 's,\(-.\)\([[^[:space:]]]*\),\\\\\1|\2,g; s,[[[:space:]]][[[:space:]]]*,|,g; s,\(.\)||,\1|\1|,g; s,\(.\)|$,\1|\1,'`
# get current compiler; don't use $ac_compiler
eval ax_test_compiler=`set X $ac_compile; echo $[2]`
AC_MSG_CHECKING([whether $ax_test_compiler accepts $1])
AC_CACHE_VAL(
[$ax_test_compiler_flags_var],
[
# Create a conftest file.
AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
# Compile and inspect standard error for given flags.
echo "$ax_test_compiler $_AC_LANG_PREFIX[]FLAGS -c conftest.$ac_ext 2> conftest.err0" >&AS_MESSAGE_LOG_FD
$ax_test_compiler $_AC_LANG_PREFIX[]FLAGS -c conftest.$ac_ext 2> conftest.err0 >&AS_MESSAGE_LOG_FD
echo "cat conftest.err0" >&AS_MESSAGE_LOG_FD
cat conftest.err0 >&AS_MESSAGE_LOG_FD
echo "$ax_test_compiler $_AC_LANG_PREFIX[]FLAGS $1 -c conftest.$ac_ext 2> conftest.err" >&AS_MESSAGE_LOG_FD
$ax_test_compiler $_AC_LANG_PREFIX[]FLAGS $1 -c conftest.$ac_ext 2> conftest.err >&AS_MESSAGE_LOG_FD
echo "cat conftest.err" >&AS_MESSAGE_LOG_FD
cat conftest.err >&AS_MESSAGE_LOG_FD
echo $EGREP "$ax_test_compiler_flags_regexp" conftest.err >&AS_MESSAGE_LOG_FD
ax_test_compiler_flags_err=`$EGREP "$ax_test_compiler_flags_regexp" conftest.err 2>&1`
echo $ax_test_compiler_flags_err >&AS_MESSAGE_LOG_FD
echo diff conftest.err0 conftest.err >&AS_MESSAGE_LOG_FD
ax_test_compiler_flags_diff=`diff conftest.err0 conftest.err 2>&1`
echo $ax_test_compiler_flags_diff >&AS_MESSAGE_LOG_FD
eval "$ax_test_compiler_flags_var=no"
if test "$ax_test_compiler_flags_err" = x"" || test x"$ax_test_compiler_flags_diff" = x""; then
# compile, link, and run the test program.
echo "$ax_test_compiler $_AC_LANG_PREFIX[]FLAGS $1 conftest.$ac_ext -o conftest$ac_exeext 2> conftest.err" >&AS_MESSAGE_LOG_FD
$ax_test_compiler $_AC_LANG_PREFIX[]FLAGS $1 conftest.$ac_ext -o conftest$ac_exeext 2> conftest.err >&AS_MESSAGE_LOG_FD
echo "cat conftest.err" >&AS_MESSAGE_LOG_FD
cat conftest.err >&AS_MESSAGE_LOG_FD
echo "./conftest$ac_exeext 2> conftest.err >&2" >&AS_MESSAGE_LOG_FD
./conftest$ac_exeext 2> conftest.err >&2
ax_test_compiler_flags_run=$?
echo "cat conftest.err" >&AS_MESSAGE_LOG_FD
cat conftest.err >&AS_MESSAGE_LOG_FD
# success
if test x"`cat conftest.err`" = x"" && test x"$ax_test_compiler_flags_run" = x"0"; then
eval "$ax_test_compiler_flags_var=yes"
fi
fi
rm -f conftest.$ac_ext conftest.$ac_objext conftest.err conftest.err0 conftest$ac_exeext
]
)
eval "ax_test_compiler_flags_value=\$$ax_test_compiler_flags_var"
AC_MSG_RESULT([$ax_test_compiler_flags_value])
if test x"$ax_test_compiler_flags_value" = x"yes"; then
_AC_LANG_PREFIX[]FLAGS="$_AC_LANG_PREFIX[]FLAGS $1"
ifelse([$2],[],[:],[$2])
else
ifelse([$3],[],[:],[$3])
fi
])
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