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authorMike Frysinger <vapier@gentoo.org>2008-01-05 05:55:23 +0000
committerMike Frysinger <vapier@gentoo.org>2008-01-05 05:55:23 +0000
commite6e3f570fa7dcd16eadc2cf51247ab91bc2aa9fe (patch)
tree71470afc59061118febd56d40ddb56f52bebbf39
parent434de2bfe0a74d4efc578e4da623d4ba783e9d8a (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.h4
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) \