diff options
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/acinclude.m4 b/acinclude.m4 new file mode 100644 index 000000000..3120d8620 --- /dev/null +++ b/acinclude.m4 @@ -0,0 +1,65 @@ +dnl Turn on the additional warnings last, so -Werror doesn't affect other tests. + +AC_DEFUN([IDT_COMPILE_WARNINGS],[ + if test -f $srcdir/autogen.sh; then + default_compile_warnings="error" + else + default_compile_warnings="no" + fi + + AC_ARG_WITH(compile-warnings, + AS_HELP_STRING([--with-compile-warnings=@<:@no/yes/error@:>@], + [Compiler warnings]), + [enable_compile_warnings="$withval"], + [enable_compile_warnings="$default_compile_warnings"]) + + warnCFLAGS= + if test "x$GCC" != xyes; then + enable_compile_warnings=no + fi + + warning_flags= + realsave_CFLAGS="$CFLAGS" + + case "$enable_compile_warnings" in + no) + warning_flags= + ;; + yes) + warning_flags="-Wall -Wunused -Wmissing-prototypes -Wmissing-declarations" + ;; + maximum|error) + warning_flags="-Wall -Wunused -Wchar-subscripts -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wpointer-arith" + CFLAGS="$warning_flags $CFLAGS" + for option in -Wno-sign-compare -Wno-pointer-sign; do + SAVE_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $option" + AC_MSG_CHECKING([whether gcc understands $option]) + AC_TRY_COMPILE([], [], + has_option=yes, + has_option=no,) + CFLAGS="$SAVE_CFLAGS" + AC_MSG_RESULT($has_option) + if test $has_option = yes; then + warning_flags="$warning_flags $option" + fi + unset has_option + unset SAVE_CFLAGS + done + unset option + if test "$enable_compile_warnings" = "error" ; then + warning_flags="$warning_flags -Werror" + fi + ;; + *) + AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings) + ;; + esac + CFLAGS="$realsave_CFLAGS" + AC_MSG_CHECKING(what warning flags to pass to the C compiler) + AC_MSG_RESULT($warning_flags) + + WARN_CFLAGS="$warning_flags" + AC_SUBST(WARN_CFLAGS) +]) + |