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
projects / seabios.git / blobdiff