Dear Marek Vasut,
On 31.10.12 17:32, Marek Vasut wrote:
Flip over from linking with LD to linking with GCC. This has some long-term benefits, like easy path to enabling LTO.
Most of this patch is about passing parameters to the linker invoked by GCC at the linking stage. This involves prefixing most of these with -Wl,<param> . A few more adjustments had to be made though.
The LDFLAGS had to be extended by --build-id=none to prevent generation of the .note.gnu.build-id section, which contains unique build-id we don't care about. Moreover -nostdlib had to be added to LDFLAGS to link properly without pulling in GCC libs during partial link.
The LDFLAGS_FINAL had to be augmented by -Wl,-allow-multiple-definition to prevent GCC from complaining about multiple definitions of the register containing global data.
Signed-off-by: Marek Vasut marex@denx.de Cc: Albert Aribaud albert.u.boot@aribaud.net Cc: Joe Hershberger joe.hershberger@ni.com Cc: Mike Frysinger vapier@gentoo.org Cc: Tom Rini trini@ti.com Cc: Wolfgang Denk wd@denx.de
NOTE: It should mostly work, but _PLEASE_ test it properly. I definitelly can not run it on most of the affected platforms. Besides, it might still hit some build issues, it's not properly compiler-tested. Any additional fixes are welcome ;-)
NOTE: I detected code size being smaller by a few bytes, but then it might cause breakage, so I'd be really cautious here.
<snip>
diff --git a/config.mk b/config.mk index b7cd481..ec8cd6b 100644 --- a/config.mk +++ b/config.mk @@ -137,9 +137,8 @@ binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS)) # AS = $(CROSS_COMPILE)as
-# Always use GNU ld -LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)+# Link with GCC +LD = $(CROSS_COMPILE)gcc
with this change we should also remove LD_VERSION_STRING from $(VERSION_FILE). Currently it will call 'gcc -v' which will print compile switches to stderr.
Compiled and runtime tested on avr32 atngw100mkii, on first sight it seems sane.
Best regards
Andreas Bießmann