Revert "merge git work"

[empathy.git] / m4 / acinclude.m4

diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
new file mode 100644 (file)
index 0000000..3120d86
--- /dev/null
+++ b/m4/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)
+])
+