2 # Script to test if gcc "-fwhole-program" works properly.
5 TMPFILE1=out/tmp_testcompile1.c
6 TMPFILE1o=out/tmp_testcompile1.o
7 TMPFILE2=out/tmp_testcompile2.c
8 TMPFILE2o=out/tmp_testcompile2.o
9 TMPFILE3o=out/tmp_testcompile3.o
11 # Test for "-fwhole-program". Older versions of gcc (pre v4.1) don't
12 # support the whole-program optimization - detect that.
13 $CC -fwhole-program -S -o /dev/null -xc /dev/null > /dev/null 2>&1
15 echo " Working around no -fwhole-program" > /dev/fd/2
20 # Test if "visible" variables and functions are marked global. On
21 # OpenSuse 10.3 "visible" variables declared with "extern" first
22 # aren't marked as global in the resulting assembler. On Ubuntu 7.10
23 # "visible" functions aren't marked as global in the resulting
25 cat - > $TMPFILE1 <<EOF
26 void __attribute__((externally_visible)) t1() { }
27 extern unsigned char v1;
28 unsigned char v1 __attribute__((section(".data16.foo.19"))) __attribute__((externally_visible));
30 $CC -Os -c -fwhole-program $TMPFILE1 -o $TMPFILE1o > /dev/null 2>&1
31 cat - > $TMPFILE2 <<EOF
33 extern unsigned char v1;
34 int __attribute__((externally_visible)) main() { t1(); return v1; }
36 $CC -Os -c -fwhole-program $TMPFILE2 -o $TMPFILE2o > /dev/null 2>&1
37 $CC -nostdlib -Os $TMPFILE1o $TMPFILE2o -o $TMPFILE3o > /dev/null 2>&1
39 echo " Working around non-functional -fwhole-program" > /dev/fd/2
44 # Test if "-combine" works. On Ubuntu 8.04 the compiler doesn't work
45 # correctly with combine and the "struct bregs" register due to the
46 # anonymous unions and structs. On Fedora Core 12 the compiler throws
47 # an internal compiler error when multiple files access global
48 # variables with debugging enabled.
49 cat - > $TMPFILE1 <<EOF
50 // Look for anonymous union/struct failure
51 struct ts { union { int u1; struct { int u2; }; }; };
52 void func1(struct ts *r);
54 // Look for global variable failure.
55 struct s1_s { int v; } g1;
56 void __attribute__((externally_visible)) func2() {
57 struct s1_s *l1 = &g1;
60 cat - > $TMPFILE2 <<EOF
61 struct ts { union { int u1; struct { int u2; }; }; };
62 void func1(struct ts *r);
64 extern struct s1_s g1;
69 $CC -O -g -fwhole-program -combine -c $TMPFILE1 $TMPFILE2 -o $TMPFILE1o > /dev/null 2>&1
73 echo " Working around non-functional -combine" > /dev/fd/2
77 # Also, on several compilers, -combine fails if code is emitted with a
78 # reference to an extern variable that is later found to be externally
79 # visible - the compiler does not mark those variables as global.
80 # This is being worked around by ordering the compile objects to avoid
83 # Also, the Ubuntu 8.04 compiler has a bug causing corruption when the
84 # "ebp" register is clobberred in an "asm" statement. The code has
85 # been modified to not clobber "ebp" - no test is available yet.
87 rm -f $TMPFILE1 $TMPFILE1o $TMPFILE2 $TMPFILE2o $TMPFILE3o