mirrors/git
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

inline constant return from error() function

Browse Source 
Commit e208f9c introduced a macro to turn error() calls
into:

  (error(), -1)

to make the constant return value more visible to the
calling code (and thus let the compiler make better
decisions about the code).

This works well for code like:

  return error(...);

but the "-1" is superfluous in code that just calls error()
without caring about the return value. In older versions of
gcc, that was fine, but gcc 4.9 complains with -Wunused-value.

We can work around this by encapsulating the constant return
value in a static inline function, as gcc specifically
avoids complaining about unused function returns unless the
function has been specifically marked with the
warn_unused_result attribute.

We also use the same trick for config_error_nonbool and
opterror, which learned the same error technique in a469a10.

Reported-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2014-05-06 11:14:42 -04:00
committed by Junio C Hamano
parent 0bc85abb7a
commit 87fe5df365
3 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
parse-options.h
View File

@ -180,7 +180,7 @@ extern NORETURN void usage_msg_opt(const char *msg,
extern int optbug(const struct option *opt, const char *reason);
extern int opterror(const struct option *opt, const char *reason, int flags);
#if defined(__GNUC__) && ! defined(__clang__)
#define opterror(o,r,f) (opterror((o),(r),(f)), -1)
#define opterror(o,r,f) (opterror((o),(r),(f)), const_error())
#endif
/*----- incremental advanced APIs -----*/