X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=tools%2Ftest-gcc.sh;h=935f211b0a2f6899846cfdb2a875c7f13534d6f0;hb=d4398adab635f10a55717e2472ecf651b1edab3c;hp=55f359faccd61657a712b8e8a5a81bd5af4bb4d9;hpb=942d495dcd12801187076d12e5f7409e8a8aa661;p=seabios.git

diff --git a/tools/test-gcc.sh b/tools/test-gcc.sh
index 55f359f..935f211 100755
--- a/tools/test-gcc.sh
+++ b/tools/test-gcc.sh
@@ -4,65 +4,118 @@
 mkdir -p out
 TMPFILE1=out/tmp_testcompile1.c
 TMPFILE1o=out/tmp_testcompile1.o
+TMPFILE1_ld=out/tmp_testcompile1.lds
 TMPFILE2=out/tmp_testcompile2.c
 TMPFILE2o=out/tmp_testcompile2.o
 TMPFILE3o=out/tmp_testcompile3.o
 
-# Test for "-fwhole-program"
-$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
-    exit 0
-fi
-
-# Test if "visible" variables are marked global.
+# Test if ld's alignment handling is correct.  This is a known problem
+# with the linker that ships with Ubuntu 11.04.
 cat - > $TMPFILE1 <<EOF
-unsigned char t1 __attribute__((section(".data16.foo.19"))) __attribute__((externally_visible));
+const char v1[] __attribute__((section(".text.v1"))) = "0123456789";
+const char v2[] __attribute__((section(".text.v2"))) = "0123456789";
 EOF
-$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; }
+cat - > $TMPFILE1_ld <<EOF
+SECTIONS
+{
+     .mysection 0x88f0 : {
+. = 0x10 ;
+*(.text.v1)
+. = 0x20 ;
+*(.text.v2)
+. = 0x30 ;
+     }
+}
 EOF
-$CC -Os -c -fwhole-program $TMPFILE2 -o $TMPFILE2o > /dev/null 2>&1
-$CC -nostdlib -Os $TMPFILE1o $TMPFILE2o -o $TMPFILE3o > /dev/null 2>&1
+$CC -O -g -c $TMPFILE1 -o $TMPFILE1o > /dev/null 2>&1
+$LD -T $TMPFILE1_ld $TMPFILE1o -o $TMPFILE2o > /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 "The version of LD on this system does not properly handle" > /dev/fd/2
+    echo "alignments.  As a result, this project can not be built." > /dev/fd/2
+    echo "" > /dev/fd/2
+    echo "The problem may be the result of this LD bug report:" > /dev/fd/2
+    echo " http://sourceware.org/bugzilla/show_bug.cgi?id=12726" > /dev/fd/2
+    echo "" > /dev/fd/2
+    echo "Please update to a working version of binutils and retry." > /dev/fd/2
     echo -1
-    exit 1
+    exit 0
 fi
 
-# Test if "visible" functions are marked global.
+# 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 2
+    exit 0
+fi
+
+# 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 - > $TMPFILE1 <<EOF
+// Look for anonymous union/struct failure
 struct ts { union { int u1; struct { int u2; }; }; };
-void t1(struct ts *r);
+void func1(struct ts *r);
+
+// Look for global variable failure.
+struct s1_s { int v; } g1;
+void __attribute__((externally_visible)) func2() {
+    struct s1_s *l1 = &g1;
+    l1->v=0;
+}
 EOF
-$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 "  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
 
-rm -f $TMPFILE1 $TMPFILE1o $TMPFILE2 $TMPFILE2o $TMPFILE3o
+# 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 $TMPFILE1_ld $TMPFILE2 $TMPFILE2o $TMPFILE3o