From 03e0cc6b437d55b49b66967b745a04c74b7ee67d Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Wed, 26 Jan 2022 17:56:10 +0300
Subject: [PATCH] Add -Wall to CFLAGS if available.
---
configure | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
configure.ac | 33 +++++++++++++++++++++++++++++++++
2 files changed, 81 insertions(+)
diff --git a/configure b/configure
index 0c38fb1..f25a292 100755
--- a/configure
+++ b/configure
@@ -15666,6 +15666,52 @@ case "$host" in
esac
+CheckWarnAll()
+{
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GCC -Wall option" >&5
+$as_echo_n "checking for GCC -Wall option... " >&6; }
+ have_gcc_Wall=no
+
+ save_CFLAGS="$CFLAGS"
+ CFLAGS="$save_CFLAGS -Wall"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+int x = 0;
+int
+main ()
+{
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ have_gcc_Wall=yes
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_gcc_Wall" >&5
+$as_echo "$have_gcc_Wall" >&6; }
+ CFLAGS="$save_CFLAGS"
+
+ if test x$have_gcc_Wall = xyes; then
+ CFLAGS="$CFLAGS -Wall"
+
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for necessary GCC -Wno-multichar option" >&5
+$as_echo_n "checking for necessary GCC -Wno-multichar option... " >&6; }
+ need_gcc_Wno_multichar=no
+ case "$host" in
+ *-*-haiku*)
+ need_gcc_Wno_multichar=yes
+ ;;
+ esac
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $need_gcc_Wno_multichar" >&5
+$as_echo "$need_gcc_Wno_multichar" >&6; }
+ if test x$need_gcc_Wno_multichar = xyes; then
+ CFLAGS="$CFLAGS -Wno-multichar"
+ fi
+ fi
+}
+
CheckVisibilityHidden()
{
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for GCC -fvisibility=hidden option" >&5
@@ -16235,6 +16281,8 @@ else
fi
+CheckWarnAll
+
CheckVisibilityHidden
CXXFLAGS="$CXXFLAGS $CFLAGS"
diff --git a/configure.ac b/configure.ac
index a26f214..3c1bcab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -112,6 +112,36 @@ case "$host" in
esac
AC_SUBST(INETLIB)
+dnl See if GCC's -Wall is supported.
+CheckWarnAll()
+{
+ AC_MSG_CHECKING(for GCC -Wall option)
+ have_gcc_Wall=no
+
+ save_CFLAGS="$CFLAGS"
+ CFLAGS="$save_CFLAGS -Wall"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int x = 0;])], [have_gcc_Wall=yes])
+ AC_MSG_RESULT($have_gcc_Wall)
+ CFLAGS="$save_CFLAGS"
+
+ if test x$have_gcc_Wall = xyes; then
+ CFLAGS="$CFLAGS -Wall"
+
+dnl Haiku headers use multicharacter constants all over the place. Ignore these warnings when using -Wall.
+ AC_MSG_CHECKING(for necessary GCC -Wno-multichar option)
+ need_gcc_Wno_multichar=no
+ case "$host" in
+ *-*-haiku*)
+ need_gcc_Wno_multichar=yes
+ ;;
+ esac
+ AC_MSG_RESULT($need_gcc_Wno_multichar)
+ if test x$need_gcc_Wno_multichar = xyes; then
+ CFLAGS="$CFLAGS -Wno-multichar"
+ fi
+ fi
+}
+
dnl See if GCC's -fvisibility=hidden is supported (gcc4 and later, usually).
CheckVisibilityHidden()
{
@@ -168,6 +198,9 @@ http://www.libsdl.org/projects/GUIlib/
fi
AM_CONDITIONAL(HAVE_GUI_LIB, test x$have_GUI = xyes)
+dnl check for GCC warning options
+CheckWarnAll
+
dnl check for GCC visibility attributes
CheckVisibilityHidden