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authorRich Felker <dalias@aerifal.cx>2012-09-06 23:34:10 -0400
committerRich Felker <dalias@aerifal.cx>2012-09-06 23:34:10 -0400
commit0c05bd3a9c165cf2f0b9d6fa23a1f96532ddcdb3 (patch)
tree124c1d65e338abece7cf55c95cbc8195be94fe2f /include/err.h
parent453059571c9dc84dd168631eced25ec2d7afd98e (diff)
downloadmusl-0c05bd3a9c165cf2f0b9d6fa23a1f96532ddcdb3.tar.gz
further use of _Noreturn, for non-plain-C functions
note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath.
Diffstat (limited to 'include/err.h')
-rw-r--r--include/err.h15
1 files changed, 11 insertions, 4 deletions
diff --git a/include/err.h b/include/err.h
index 5e33f9e4..a6505c36 100644
--- a/include/err.h
+++ b/include/err.h
@@ -1,6 +1,13 @@
#ifndef _ERR_H
#define _ERR_H
+#if __STDC_VERSION__ >= 201112L
+#elif defined(__GNUC__)
+#define _Noreturn __attribute__((__noreturn__))
+#else
+#define _Noreturn
+#endif
+
#include <stdarg.h>
#ifdef __cplusplus
@@ -12,10 +19,10 @@ void vwarn(const char *, va_list);
void warnx(const char *, ...);
void vwarnx(const char *, va_list);
-void err(int, const char *, ...);
-void verr(int, const char *, va_list);
-void errx(int, const char *, ...);
-void verrx(int, const char *, va_list);
+_Noreturn void err(int, const char *, ...);
+_Noreturn void verr(int, const char *, va_list);
+_Noreturn void errx(int, const char *, ...);
+_Noreturn void verrx(int, const char *, va_list);
#ifdef __cplusplus
}