# Test if "-combine" works. On Ubuntu 8.04 the compiler doesn't work
# correctly with combine and the "struct bregs" register due to the
-# anonymous unions and structs.
-mkdir -p out
+# anonymous unions and structs. On Fedora Core 12 the compiler throws
+# an internal compiler error when multiple files access global
+# variables with debugging enabled.
cat - > $TMPFILE1 <<EOF
+// Look for anonymous union/struct failure
struct ts { union { int u1; struct { int u2; }; }; };
-void t1(struct ts *r);
+void func1(struct ts *r);
+
+// Look for global variable failure.
+struct s1_s { int v; } g1;
+void __attribute__((externally_visible)) func2() {
+ struct s1_s *l1 = &g1;
+}
EOF
-$CC -c -fwhole-program -combine $TMPFILE1 $TMPFILE1 -o $TMPFILE1o > /dev/null 2>&1
+cat - > $TMPFILE2 <<EOF
+struct ts { union { int u1; struct { int u2; }; }; };
+void func1(struct ts *r);
+
+extern struct s1_s g1;
+void func3() {
+ &g1;
+}
+EOF
+$CC -O -g -fwhole-program -combine -c $TMPFILE1 $TMPFILE2 -o $TMPFILE1o > /dev/null 2>&1
if [ $? -eq 0 ]; then
echo 0
else
echo 1
fi
+# Also, on several compilers, -combine fails if code is emitted with a
+# reference to an extern variable that is later found to be externally
+# visible - the compiler does not mark those variables as global.
+# This is being worked around by ordering the compile objects to avoid
+# this case.
+
# Also, the Ubuntu 8.04 compiler has a bug causing corruption when the
# "ebp" register is clobberred in an "asm" statement. The code has
# been modified to not clobber "ebp" - no test is available yet.