Andrei Borzenkov <address@hidden> writes:
19.08.2015 21:35, Mark H Weaver пишет:
Include -mabi=32 in CFLAGS_PLATFORM and CCASFLAGS_PLATFORM to compile
code for the O32 ABI when targetting MIPS, since the MIPS assembly code
in GRUB assumes this. This flag is also needed when compiling
asm-tests/mips.S from configure, because GNU as rejects MIPS register
names such as $t2 unless the O32 ABI is selected.
---
conf/Makefile.common | 4 ++++
configure.ac | 7 +++++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/conf/Makefile.common b/conf/Makefile.common
index fcb8d2e..bd125da 100644
--- a/conf/Makefile.common
+++ b/conf/Makefile.common
@@ -20,6 +20,10 @@ endif
if COND_powerpc_ieee1275
CFLAGS_PLATFORM += -mcpu=powerpc
endif
+if COND_mips
+ CFLAGS_PLATFORM += -mabi=32
+ CCASFLAGS_PLATFORM = -mabi=32
+endif
Does it work with clang?
Based on the error message below, clang seems to accept and understand
the -mabi=32 option, but the version of clang that we have in GNU Guix
(which uses the N32 ABI on MIPS) seems to lack support for compiling for
O32:
address@hidden:~$ clang -mabi=32 mips.S
error: unknown target CPU 'mips32r2'
However, it doesn't work without that option either:
address@hidden:~$ clang mips.S
mips.S: Assembler messages:
mips.S:7: Error: invalid operands `ld $t2,0($t6)'
mips.S:10: Error: invalid operands `addiu $t7,$s0,(b-a)'
clang-3.6: error: assembler command failed with exit code 1 (use -v to see
invocation)
This is the same failure that occurs with gcc when configured to use the
N32 ABI by default. I also tried passing -fno-integrated-as in both
cases above, but it made no difference.