https://sourceware.org/bugzilla/show_bug.cgi?id=3298
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |olegendo at gcc dot gnu.org
--- Comment #4 from Oleg Endo <olegendo at gcc dot gnu.org> ---
Created attachment 8080
--> https://sourceware.org/bugzilla/attachment.cgi?id=8080&action=edit
GCC patch to enable -mrelax by default
This is another patch to turn the -mrelax option in GCC by default.
Since PR 10378 and PR 10373 have been fixed, I've tried building GCC with
-mrelaxed enabled by default. The build would stop in
libgcc/config/sh/lib1funcs.S, where GAS would complain that a mova insn is
referring to an unaligned offset.
After applying the following:
Index: libgcc/config/sh/lib1funcs.S
===================================================================
--- libgcc/config/sh/lib1funcs.S (revision 220017)
+++ libgcc/config/sh/lib1funcs.S (working copy)
@@ -116,7 +116,7 @@
HIDDEN_FUNC(GLOBAL(ashiftrt_r4_31))
HIDDEN_FUNC(GLOBAL(ashiftrt_r4_32))
- .align 1
+ .align 4
GLOBAL(ashiftrt_r4_32):
GLOBAL(ashiftrt_r4_31):
rotcl r4
@@ -765,6 +765,7 @@
bt GLOBAL(movmemSI52)
! done all the large groups, do the remainder
! jump to movmem+
+ .balign 4
mova GLOBAL(movmemSI4)+4,r0
add r6,r0
jmp @r0
GCC (sh-elf C,C++, newlib 2.2.0) can be built successfully.
When compiling a simple C++ program with the resulting toolchain:
#include <iostream>
int main (void)
{
std::cout << "hello world" << std::endl;
return 0;
}
There are a lot of warnings from LD like:
/usr/local/lib/gcc/sh-elf/5.0.0/../../../../sh-elf/bin/ld:
/usr/local/lib/gcc/sh-elf/5.0.0/../../../../sh-elf/lib/ml/m4/libstdc++.a(locale_init.o):
0x18: warning: symbol in unexpected section
/usr/local/lib/gcc/sh-elf/5.0.0/../../../../sh-elf/bin/ld:
/usr/local/lib/gcc/sh-elf/5.0.0/../../../../sh-elf/lib/ml/m4/libstdc++.a(locale_init.o):
0x6c: warning: symbol in unexpected section
/usr/local/lib/gcc/sh-elf/5.0.0/../../../../sh-elf/bin/ld:
/usr/local/lib/gcc/sh-elf/5.0.0/../../../../sh-elf/lib/ml/m4/libstdc++.a(locale_init.o):
0x70: warning: symbol in unexpected section
/usr/local/lib/gcc/sh-elf/5.0.0/../../../../sh-elf/bin/ld:
/usr/local/lib/gcc/sh-elf/5.0.0/../../../../sh-elf/lib/ml/m4/libstdc++.a(locale_init.o):
0x3c: warning: symbol in unexpected section
But linking somehow succeeds. However, the resulting program does not work.
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