From cc9664b3049ebdbcbbf8e9337b9f0cdabbdc4e16 Mon Sep 17 00:00:00 2001
From: Steve Checkoway <stevecheckoway@users.sourceforge.net>
Date: Tue, 13 Mar 2007 10:04:59 +0000
Subject: [PATCH] Add option -fsigned-char when gcc requires it. Note that
 AC_TRY_* are obsolete macros
 <http://www.gnu.org/software/autoconf/manual/autoconf.html#Obsolete-Macros>
 and should probably be replaced at some point.

---
 stepmania/configure.ac | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/stepmania/configure.ac b/stepmania/configure.ac
index 12b8320c8a..711bc4fdeb 100644
--- a/stepmania/configure.ac
+++ b/stepmania/configure.ac
@@ -47,6 +47,17 @@ case $compile in
 	;;
 esac
 
+
+# Some (broken?) versions of gcc treat char as unsigned, check for that.
+AC_LANG_PUSH([C])
+AC_MSG_CHECKING([for gcc option to use signed chars])
+AC_RUN_IFELSE([AC_LANG_SOURCE([[int main(){return (char)-1==-1?0:1;}]])],
+	   [sc_option=],[sc_option=-fsigned-char])
+AC_MSG_RESULT([${sc_option-none}])
+CFLAGS="$CFLAGS $sc_option"
+CXXFLAGS="$CXXFLAGS $sc_option"
+AC_LANG_POP([C])
+
 # Define UNIX for all Unix-like systems.  Don't define it for cross-compiling to
 # non-Unix-like systems.  (-DUNIX selects the archutils and ArchHooks to use; if
 # your platform doesn't use the Unix ones, you probably don't want to define UNIX.)