Replace the CFLAGS-checking code with a common macro from xine-lib.
Instead of writing custom code to check for cflags checking, import a
copy of attributes.m4 from xine-lib's repository and use the
CC_CHECK_CFLAGS macro.
The advantage lies not only in being able to reduce the custom code in
configure.ac, but also in the fact that the CC_CHECK_CFLAGS macro
caches the results, making ./configure -C quite faster on second run.
Check for the CFLAGS for any compiler and not just GCC, if the
compiler does support the flag it is better to u se it anyway,
otherwise it will be skipped.
diff --git a/configure.ac b/configure.ac
index 0d00b25..1a62085 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,29 +44,11 @@
AC_PROG_MAKE_SET
AC_PROG_LIBTOOL
-test_gcc_flag() {
- AC_LANG_CONFTEST([int main(int argc, char*argv[]) {}])
- $CC -c conftest.c $CFLAGS "$1" -o conftest.o > /dev/null 2> /dev/null
- ret=$?
- rm -f conftest.o
- return $ret
-}
+DESIRED_FLAGS="-Wall -W -Wextra -pedantic -pipe -Wformat -Wold-style-definition -Wdeclaration-after-statement -Wfloat-equal -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-noreturn -Wshadow -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Winline -Wno-unused-parameter -ffast-math"
-# If using GCC specify some additional parameters
-if test "x$GCC" = "xyes" ; then
- DESIRED_FLAGS="-Wall -W -Wextra -pedantic -pipe -Wformat -Wold-style-definition -Wdeclaration-after-statement -Wfloat-equal -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-noreturn -Wshadow -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Winline -Wno-unused-parameter -ffast-math"
-
- for flag in $DESIRED_FLAGS ; do
- AC_MSG_CHECKING([whether $CC accepts $flag])
- if test_gcc_flag $flag ; then
- CFLAGS="$CFLAGS $flag"
- CXXFLAGS="$CXXFLAGS $flag"
- AC_MSG_RESULT([yes])
- else
- AC_MSG_RESULT([no])
- fi
- done
-fi
+for flag in $DESIRED_FLAGS ; do
+ CC_CHECK_CFLAGS([$flag], [CFLAGS="$CFLAGS $flag"])
+done
# Checks for header files.
AC_HEADER_ASSERT