diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2000-06-18 03:08:19 +0400 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2000-06-18 03:08:19 +0400 |
| commit | 20c74690606013f62e8f7fcd909a2e6d584ec9e5 (patch) | |
| tree | fd02572401a77cc3382c069c69f712b4cae7fcd7 /include/symcat.h | |
| parent | 4a7a5a717ca76c4a17b0107c8b0306dfb1ff63fe (diff) | |
2000-06-17 H.J. Lu <hjl@gnu.org>
* getopt.h: Updated from gcc.
* libiberty.h: Likewise.
* symcat.h: Likewise.
Diffstat (limited to 'include/symcat.h')
| -rw-r--r-- | include/symcat.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/include/symcat.h b/include/symcat.h index 3e27162b2..61ce1e9b3 100644 --- a/include/symcat.h +++ b/include/symcat.h @@ -19,12 +19,16 @@ #ifndef SYM_CAT_H #define SYM_CAT_H -#if defined (__STDC__) || defined (ALMOST_STDC) +#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE) #define CONCAT2(a,b) a##b #define CONCAT3(a,b,c) a##b##c #define CONCAT4(a,b,c,d) a##b##c##d #define STRINGX(s) #s #else +/* Note one should never pass extra whitespace to the CONCATn macros, + e.g. CONCAT2(foo, bar) because traditonal C will keep the space between + the two labels instead of concatenating them. Instead, make sure to + write CONCAT2(foo,bar). */ #define CONCAT2(a,b) a/**/b #define CONCAT3(a,b,c) a/**/b/**/c #define CONCAT4(a,b,c,d) a/**/b/**/c/**/d @@ -35,6 +39,11 @@ #define XCONCAT3(a,b,c) CONCAT3(a,b,c) #define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d) +/* Note the layer of indirection here is typically used to allow + stringification of the expansion of macros. I.e. "#define foo + bar", "XSTRING(foo)", to yield "bar". Be aware that this only + works for __STDC__, not for traditional C which will still resolve + to "foo". */ #define XSTRING(s) STRINGX(s) -#endif SYM_CAT_H +#endif /* SYM_CAT_H */ |