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try-syscall: Use compiler-predefined macros to detect mips ABI

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_MIPS_SIM_ABI32 etc. are defined by Linux <asm/sgidefs.h>, which is
included by glibc <sys/syscall.h> (which defers to Linux headers to
get syscall numbers), but not by musl <sys/syscall.h>.

_ABIO32 etc. are predefined by the compiler, so they are always
available, regardless of libc. References:

https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=27d54b2a6c18ef1ae50f1a5b432d590438445b90
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=0ea339ea4d9c3e04ae17da6bf389617eb0251e57

Originally containers/bubblewrap#492 in bubblewrap.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie
2022-05-10 17:01:01 +01:00
committed by Phaedrus Leeds
parent ea879dc38c
commit 836b0fb604
1 changed files with 3 additions and 3 deletions
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6
tests/try-syscall.c
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@@ -24,11 +24,11 @@
#include <sys/types.h>
#if defined(_MIPS_SIM)
# if _MIPS_SIM == _MIPS_SIM_ABI32
# if _MIPS_SIM == _ABIO32
# define MISSING_SYSCALL_BASE 4000
# elif _MIPS_SIM == _MIPS_SIM_ABI64
# elif _MIPS_SIM == _ABI64
# define MISSING_SYSCALL_BASE 5000
# elif _MIPS_SIM == _MIPS_SIM_NABI32
# elif _MIPS_SIM == _ABIN32
# define MISSING_SYSCALL_BASE 6000
# else
# error "Unknown MIPS ABI"