Commit 6d91c14b authored by Lubomir Rintel's avatar Lubomir Rintel 🥕

build: add macro to check the compiler flag support

Also, fold duplicate chunks together.
parent 3b0dd0a5
dnl Check whether a particular compiler flag works with code provided,
dnl disable it in CFLAGS if the check fails.
AC_DEFUN([NM_COMPILER_WARNING], [
AC_DEFUN([_NM_COMPILER_FLAG], [
CFLAGS_SAVED="$CFLAGS"
CFLAGS="$CFLAGS $GLIB_CFLAGS -Werror $1"
AC_MSG_CHECKING(whether -W$1 works)
AC_MSG_CHECKING([whether $1 works as expected])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[]])], [
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[$2]])], [
AC_MSG_RESULT(yes)
CFLAGS="$CFLAGS_SAVED -W$1"
CFLAGS="$CFLAGS_SAVED"
$3
],[
AC_MSG_RESULT(no)
CFLAGS="$CFLAGS_SAVED -Wno-$1"
CFLAGS="$CFLAGS_SAVED"
$4
])
],[
AC_MSG_RESULT(not supported)
......@@ -19,6 +19,21 @@ AC_DEFUN([NM_COMPILER_WARNING], [
])
])
dnl Check whether a particular compiler flag is supported,
dnl add it to CFLAGS if it is
AC_DEFUN([NM_COMPILER_FLAG], [
_NM_COMPILER_FLAG([$1], [], [
CFLAGS="$CFLAGS $1"
$2
], [$3])
])
dnl Check whether a particular warning is not emitted with code provided,
dnl disable it in CFLAGS if the check fails.
AC_DEFUN([NM_COMPILER_WARNING], [
_NM_COMPILER_FLAG([-W$1], [$2], [CFLAGS="$CFLAGS -W$1"], [CFLAGS="$CFLAGS -Wno-$1"])
])
AC_DEFUN([NM_COMPILER_WARNINGS],
[AC_ARG_ENABLE(more-warnings,
AS_HELP_STRING([--enable-more-warnings], [Possible values: no/yes/error]),
......@@ -40,7 +55,6 @@ if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
dnl attach it to the CFLAGS.
NM_COMPILER_WARNING([unknown-warning-option], [])
CFLAGS_SAVED="$CFLAGS"
CFLAGS_MORE_WARNINGS="-Wall -std=gnu89"
if test "x$set_more_warnings" = xerror; then
......@@ -57,22 +71,11 @@ if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
-Wpointer-arith -Winit-self \
-Wmissing-include-dirs -Wno-pragmas; do
dnl GCC 4.4 does not warn when checking for -Wno-* flags (https://gcc.gnu.org/wiki/FAQ#wnowarning)
CFLAGS="-Werror $CFLAGS_MORE_WARNINGS $(printf '%s' "$option" | sed 's/^-Wno-/-W/') $CFLAGS_SAVED"
AC_MSG_CHECKING([whether compiler understands $option])
AC_TRY_COMPILE([], [],
has_option=yes,
has_option=no,)
if test $has_option != no; then
CFLAGS_MORE_WARNINGS="$CFLAGS_MORE_WARNINGS $option"
fi
AC_MSG_RESULT($has_option)
unset has_option
_NM_COMPILER_FLAG([$(printf '%s' "$option" | sed 's/^-Wno-/-W/')], [],
[CFLAGS_MORE_WARNINGS="$CFLAGS_MORE_WARNINGS $option"], [])
done
unset option
CFLAGS="$CFLAGS_SAVED"
unset CFLAGS_SAVED
dnl Disable warnings triggered by known compiler problems
dnl https://bugzilla.gnome.org/show_bug.cgi?id=745821
......
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