diff options
| author | Mike Frysinger <vapier@gentoo.org> | 2008-01-05 05:55:23 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2008-01-05 05:55:23 +0000 |
| commit | e6e3f570fa7dcd16eadc2cf51247ab91bc2aa9fe (patch) | |
| tree | 71470afc59061118febd56d40ddb56f52bebbf39 | |
| parent | 434de2bfe0a74d4efc578e4da623d4ba783e9d8a (diff) | |
michael_d writes in #1874:
On an i386 platform with no rt_sigsuspend syscall (ie: Linux 2.0), compilation will halt on libc/sysdeps/linux/common/sigsuspend.os with a cryptic error message:
"Error: non-constant expression in ".if" statement"
I've investigated and found that the cause is that a literal '0' is being passed into a block of complex assembler macrology that is only prepared to deal with register names - '%eax', etc.
In turn, that seems to be because of a typo in the GCC register constraints. The constraints for 2 and 3-argument syscalls includes a "C" constraint. To gcc, "C" means an SSE floating point constant -- an unlikely element in a syscall. I suspect the author meant to type "S" (%esi).
| -rw-r--r-- | libc/sysdeps/linux/i386/bits/syscalls.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/i386/bits/syscalls.h b/libc/sysdeps/linux/i386/bits/syscalls.h index 8b2f1b0ec..15cd9f3e4 100644 --- a/libc/sysdeps/linux/i386/bits/syscalls.h +++ b/libc/sysdeps/linux/i386/bits/syscalls.h @@ -197,9 +197,9 @@ return (type) (INLINE_SYSCALL(name, 6, arg1, arg2, arg3, arg4, arg5, arg6)); \ #define ASMFMT_1(arg1) \ , "acdSD" (arg1) #define ASMFMT_2(arg1, arg2) \ - , "adCD" (arg1), "c" (arg2) + , "adSD" (arg1), "c" (arg2) #define ASMFMT_3(arg1, arg2, arg3) \ - , "aCD" (arg1), "c" (arg2), "d" (arg3) + , "aSD" (arg1), "c" (arg2), "d" (arg3) #define ASMFMT_4(arg1, arg2, arg3, arg4) \ , "aD" (arg1), "c" (arg2), "d" (arg3), "S" (arg4) #define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \ |