locale-util: mark special_glyph() as _const_

_const_ means that the caller can assume that the function will return the same
result every time (and will not modify global memory). special_glyph() meets
this: even though it depends on global memory, that part of global memory is
not expected to change. This allows the calls to special_glyph() to be
optimized, even if -flto is not used.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/basic/locale-util.c b/src/basic/locale-util.c
index 8134f61a73..ada0a28cd8 100644
--- a/src/basic/locale-util.c
+++ b/src/basic/locale-util.c
@@ -273,7 +273,7 @@ out:
 
 const char *special_glyph(SpecialGlyph code) {
 
-        static const char *draw_table[2][_SPECIAL_GLYPH_MAX] = {
+        static const char* const draw_table[2][_SPECIAL_GLYPH_MAX] = {
                 /* ASCII fallback */
                 [false] = {
                         [TREE_VERTICAL]      = "| ",
diff --git a/src/basic/locale-util.h b/src/basic/locale-util.h
index 353b7845fd..0630a034ab 100644
--- a/src/basic/locale-util.h
+++ b/src/basic/locale-util.h
@@ -67,7 +67,7 @@ typedef enum {
         _SPECIAL_GLYPH_MAX
 } SpecialGlyph;
 
-const char *special_glyph(SpecialGlyph code);
+const char *special_glyph(SpecialGlyph code) _const_;
 
 const char* locale_variable_to_string(LocaleVariable i) _const_;
 LocaleVariable locale_variable_from_string(const char *s) _pure_;