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# touch a.c # arm-linux-gcc -malignment-traps -mapcs-32 -c a.c # armv5b-softfloat-linux-gcc -malignment-traps -mapcs-32 -c a.c cc1: error: invalid option 'alignment-traps' cc1: error: invalid option 'apcs-32'
The (abreviated) versions
# arm-linux-gcc --version arm-linux-gcc (GCC) 3.2.1
# armv5b-softfloat-linux-gcc --version armv5b-softfloat-linux-gcc (GCC) 4.0.1
The options chosen to compile the empty "a.c" file are those chosen by the "linux-2.6.x/arch/arm/Makefile" .
Googling for the error message brings up three hits. One of them is http://marc.theaimsgroup.com/?l=linux-arm-kernel&m=110621577317150&w=2 which says
Both -malignment-traps and -mapcs-32 options are no longer needed in gcc-3.4.2 (and hence removed). You can either use a newer kernel ... which fixes this or modify the arch/arm/Makefile file.
It looks like 2.6.11 checks for the option being legal: http://lxr.linux.no/source/arch/arm/Makefile#L61 says
cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
so it looks like they use -mapcs-32 if $CC doesn't barf on it, else they use -mabi=apcs-gnu.
So which version of the kernel were you using? Something earlier than 2.6.11? - Dan
p.s. if an explicit version check is needed, maybe something like http://patchwork.ozlabs.org/linuxppc64/patch?id=787 would do. (I just found that by googling for call cc-option.)
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