Add several function attributes suggested by GCC

* lib/debug.c (vdebug): Mark first argument as a printf format string.
* lib/encodings.c (get_page_encoding): Mark as malloc-like.
(is_roff_device, get_output_encoding, get_less_charset,
get_jless_charset): Mark as pure.
* lib/glcontainers.c (string_equals, string_hash): Mark as pure.
* lib/security.c (running_setuid): Mark as pure.
* lib/util.c (trim_spaces): Mark as malloc-like.
* libdb/db_lookup.c (dash_if_unset): Mark as const.
* libdb/db_store.c (compare_ids): Mark as const.
* src/whatis.c (match): Mark as pure.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/glcontainers.c b/lib/glcontainers.c
index 732cbe42..cbd635cf 100644
--- a/lib/glcontainers.c
+++ b/lib/glcontainers.c
@@ -37,12 +37,12 @@
 
 #include "glcontainers.h"
 
-bool string_equals (const void *s1, const void *s2)
+bool _GL_ATTRIBUTE_PURE string_equals (const void *s1, const void *s2)
 {
 	return STREQ ((const char *) s1, (const char *) s2);
 }
 
-size_t string_hash (const void *s)
+size_t _GL_ATTRIBUTE_PURE string_hash (const void *s)
 {
 	return hash_pjw_bare (s, strlen ((const char *) s));
 }