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| author | Lubomir Rintel <lkundrak@v3.sk> | 2016-05-18 20:49:30 +0200 |
|---|---|---|
| committer | Lubomir Rintel <lkundrak@v3.sk> | 2016-05-18 20:53:51 +0200 |
| commit | 6d91c14b0030b63e1d5adc0a31837eff8b26537d (patch) | |
| tree | 8b8ceb3602b04a9b03f47994a0cb99b9becfdc86 /m4 | |
| parent | 3b0dd0a55c713ecff752e363038ae056e43a8125 (diff) | |
| download | NetworkManager-6d91c14b0030b63e1d5adc0a31837eff8b26537d.tar.gz | |
build: add macro to check the compiler flag support
Also, fold duplicate chunks together.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/compiler_options.m4 | 43 |
1 files changed, 23 insertions, 20 deletions
diff --git a/m4/compiler_options.m4 b/m4/compiler_options.m4 index e952e3afbe..3d2e4dbefc 100644 --- a/m4/compiler_options.m4 +++ b/m4/compiler_options.m4 @@ -1,17 +1,17 @@ -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 |