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authorJoseph Myers <joseph@codesourcery.com>2019-02-13 13:50:13 +0000
committerJoseph Myers <joseph@codesourcery.com>2019-02-13 13:50:13 +0000
commit0538372096e50d9cf0ab8bd413cf7b561a1b85d7 (patch)
tree56006ae16310643ed582e02b7e4a150a8d05693b /libio
parent86140c6223b5d14d773cf3050ffd0d14977c2c2d (diff)
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Fix -Wempty-body warnings in glibc.
One group of warnings seen building glibc with -Wextra is -Wempty-body warnings about an 'if' body (or in one case an 'else' body) that is just a semicolon, "warning: suggest braces around empty body in an 'if' statement [-Wempty-body]" - I think the point of the warning being to make it more visible whether an 'if' body is actually present or not. This patch fixes such warnings in glibc. There's one place, with a semicolon at the end of a comment, where this is clearly making the presence of an 'else' body more visible. The other cases involve macro definitions expanding to nothing. While there's no issue there with visibility at the call sites, I think it's still cleaner to have a macro that expands to something nonempty appropriate for the context - so do {} while (0) if it's only intended to be usable as a statement, or ((void) 0) where the macro definition is an alternative to a call to a function returning void, so this patch makes those changes. Tested for x86_64. * catgets/gencat.c (normalize_line): Use braces around empty 'else' body. * include/stap-probe.h [!USE_STAP_PROBE && !__ASSEMBLER__] (STAP_PROBE0): Use do {} while (0) for do-nothing definition. [!USE_STAP_PROBE && !__ASSEMBLER__] (STAP_PROBE1): Likewise. [!USE_STAP_PROBE && !__ASSEMBLER__] (STAP_PROBE2): Likewise. [!USE_STAP_PROBE && !__ASSEMBLER__] (STAP_PROBE3): Likewise. [!USE_STAP_PROBE && !__ASSEMBLER__] (STAP_PROBE4): Likewise. * libio/libio.h (_IO_funlockfile): Use ((void) 0) for do-nothing definition.
Diffstat (limited to 'libio')
-rw-r--r--libio/libio.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libio/libio.h b/libio/libio.h
index d21162a..9c08c7e 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -240,7 +240,7 @@ extern int _IO_ftrylockfile (FILE *) __THROW;
#define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
#define _IO_flockfile(_fp) /**/
-#define _IO_funlockfile(_fp) /**/
+#define _IO_funlockfile(_fp) ((void) 0)
#define _IO_ftrylockfile(_fp) /**/
#ifndef _IO_cleanup_region_start
#define _IO_cleanup_region_start(_fct, _fp) /**/