From e9e03a77994f4bf030760e2644f718776de0eb39 Mon Sep 17 00:00:00 2001 From: Thomas Rast Date: Mon, 25 Nov 2013 21:04:08 +0100 Subject: [PATCH] commit-slab: declare functions "static inline" This shuts up compiler warnings about unused functions. No such warnings are currently triggered, but if someone were to actually use init_NAME_with_stride() as documented, they would get a warning about init_NAME() being unused. While there, write a comment about why the last real declaration of the variable is without a terminating semicolon, while another forward declarations have one. Signed-off-by: Thomas Rast Helped-by: Jonathan Nieder Signed-off-by: Junio C Hamano --- commit-slab.h | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/commit-slab.h b/commit-slab.h index acfef966c3..d068e2d531 100644 --- a/commit-slab.h +++ b/commit-slab.h @@ -40,6 +40,8 @@ #define COMMIT_SLAB_SIZE (512*1024-32) #endif +#define MAYBE_UNUSED __attribute__((__unused__)) + #define define_commit_slab(slabname, elemtype) \ \ struct slabname { \ @@ -50,8 +52,8 @@ struct slabname { \ }; \ static int stat_ ##slabname## realloc; \ \ -static void init_ ##slabname## _with_stride(struct slabname *s, \ - unsigned stride) \ +static MAYBE_UNUSED void init_ ##slabname## _with_stride(struct slabname *s, \ + unsigned stride) \ { \ unsigned int elem_size; \ if (!stride) \ @@ -63,12 +65,12 @@ static void init_ ##slabname## _with_stride(struct slabname *s, \ s->slab = NULL; \ } \ \ -static void init_ ##slabname(struct slabname *s) \ +static MAYBE_UNUSED void init_ ##slabname(struct slabname *s) \ { \ init_ ##slabname## _with_stride(s, 1); \ } \ \ -static void clear_ ##slabname(struct slabname *s) \ +static MAYBE_UNUSED void clear_ ##slabname(struct slabname *s) \ { \ int i; \ for (i = 0; i < s->slab_count; i++) \ @@ -78,8 +80,8 @@ static void clear_ ##slabname(struct slabname *s) \ s->slab = NULL; \ } \ \ -static elemtype *slabname## _at(struct slabname *s, \ - const struct commit *c) \ +static MAYBE_UNUSED elemtype *slabname## _at(struct slabname *s, \ + const struct commit *c) \ { \ int nth_slab, nth_slot; \ \ @@ -103,4 +105,16 @@ static elemtype *slabname## _at(struct slabname *s, \ \ static int stat_ ##slabname## realloc +/* + * Note that this seemingly redundant second declaration is required + * to allow a terminating semicolon, which makes instantiations look + * like function declarations. I.e., the expansion of + * + * define_commit_slab(indegree, int); + * + * ends in 'static int stat_indegreerealloc;'. This would otherwise + * be a syntax error according (at least) to ISO C. It's hard to + * catch because GCC silently parses it by default. + */ + #endif /* COMMIT_SLAB_H */ -- 2.11.4.GIT