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authorH.J. Lu <hjl.tools@gmail.com>2000-06-17 23:08:19 +0000
committerH.J. Lu <hjl.tools@gmail.com>2000-06-17 23:08:19 +0000
commit20c74690606013f62e8f7fcd909a2e6d584ec9e5 (patch)
treefd02572401a77cc3382c069c69f712b4cae7fcd7 /include/symcat.h
parent4a7a5a717ca76c4a17b0107c8b0306dfb1ff63fe (diff)
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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.h13
1 files changed, 11 insertions, 2 deletions
diff --git a/include/symcat.h b/include/symcat.h
index 3e27162..61ce1e9 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 */