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[seabios.git] / tools / test-gcc.sh

diff --git a/tools/test-gcc.sh b/tools/test-gcc.sh
index 55f359faccd61657a712b8e8a5a81bd5af4bb4d9..ce3497b0d3f0a262920ed57fc3c6df2ed75b0ac1 100755 (executable)
--- a/tools/test-gcc.sh
+++ b/tools/test-gcc.sh
@@ -8,61 +8,81 @@ TMPFILE2=out/tmp_testcompile2.c
 TMPFILE2o=out/tmp_testcompile2.o
 TMPFILE3o=out/tmp_testcompile3.o
 
-# Test for "-fwhole-program"
+# Test for "-fwhole-program".  Older versions of gcc (pre v4.1) don't
+# support the whole-program optimization - detect that.
 $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.  On
+# OpenSuse 10.3 "visible" variables declared with "extern" first
+# aren't marked as global in the resulting assembler.  On Ubuntu 7.10
+# "visible" functions aren't marked as global in the resulting
+# assembler.
 cat - > $TMPFILE1 <<EOF
 void __attribute__((externally_visible)) t1() { }
+extern unsigned char v1;
+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
-mkdir -p out
+# 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.  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 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;
+    l1->v=0;
+}
+EOF
+cat - > $TMPFILE2 <<EOF
 struct ts { union { int u1; struct { int u2; }; }; };
-void t1(struct ts *r);
+void func1(struct ts *r);
+
+extern struct s1_s g1;
+void func3() {
+    &g1;
+}
 EOF
-$CC -c -fwhole-program -combine $TMPFILE1 $TMPFILE1 -o $TMPFILE1o > /dev/null 2>&1
+$CC -O -g -fwhole-program -combine -c $TMPFILE1 $TMPFILE2 -o $TMPFILE1o > /dev/null 2>&1
 if [ $? -eq 0 ]; then
-    #echo "  Setting AVOIDCOMBINE=0" > /dev/fd/2
     echo 0
 else
-    echo "  Enabling AVOIDCOMBINE=1" > /dev/fd/2
+    echo "  Working around non-functional -combine" > /dev/fd/2
     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.
+
 rm -f $TMPFILE1 $TMPFILE1o $TMPFILE2 $TMPFILE2o $TMPFILE3o