Avoid -fwhole-program on broken gcc instead of stopping build.
Enhance build to detect and avoid gcc with broken -fwhole-program
Also, remove workaround for older gcc that mess up global exports.
diff --git a/tools/test-gcc.sh b/tools/test-gcc.sh
index 55f359f..5b2d4a9 100755
--- a/tools/test-gcc.sh
+++ b/tools/test-gcc.sh
@@ -12,42 +12,27 @@
$CC -fwhole-program -S -o /dev/null -xc /dev/null > /dev/null 2>&1
if [ $? -ne 0 ]; then
echo " Working around no -fwhole-program" > /dev/fd/2
- echo 1
+ echo 2
exit 0
fi
-# Test if "visible" variables are marked global.
-cat - > $TMPFILE1 <<EOF
-unsigned char t1 __attribute__((section(".data16.foo.19"))) __attribute__((externally_visible));
-EOF
-$CC -Os -c -fwhole-program $TMPFILE1 -o $TMPFILE1o > /dev/null 2>&1
-cat - > $TMPFILE2 <<EOF
-extern unsigned char t1;
-int __attribute__((externally_visible)) main() { return t1; }
-EOF
-$CC -Os -c -fwhole-program $TMPFILE2 -o $TMPFILE2o > /dev/null 2>&1
-$CC -nostdlib -Os $TMPFILE1o $TMPFILE2o -o $TMPFILE3o > /dev/null 2>&1
-if [ $? -ne 0 ]; then
- echo "This version of gcc does not properly handle" > /dev/fd/2
- echo " global variables in -fwhole-program mode." > /dev/fd/2
- echo "Please upgrade to a newer gcc (eg, v4.3 or later)" > /dev/fd/2
- echo -1
- exit 1
-fi
-
-# Test if "visible" functions are marked global.
+# Test if "visible" variables and functions are marked global.
cat - > $TMPFILE1 <<EOF
void __attribute__((externally_visible)) t1() { }
+unsigned char v1 __attribute__((section(".data16.foo.19"))) __attribute__((externally_visible));
EOF
$CC -Os -c -fwhole-program $TMPFILE1 -o $TMPFILE1o > /dev/null 2>&1
cat - > $TMPFILE2 <<EOF
void t1();
-void __attribute__((externally_visible)) main() { t1(); }
+extern unsigned char v1;
+int __attribute__((externally_visible)) main() { t1(); return v1; }
EOF
$CC -Os -c -fwhole-program $TMPFILE2 -o $TMPFILE2o > /dev/null 2>&1
$CC -nostdlib -Os $TMPFILE1o $TMPFILE2o -o $TMPFILE3o > /dev/null 2>&1
if [ $? -ne 0 ]; then
- echo " Working around non-global functions in -fwhole-program" > /dev/fd/2
+ echo " Working around non-functional -fwhole-program" > /dev/fd/2
+ echo 2
+ exit 0
fi
# Test if "-combine" works