What are the requirements of the 'regex' module on platforms that don't have
alloca()?
All uses of alloca are inside regexec.c and are guarded by a call to
if (__libc_use_alloca (n)), which expands to if (0).
This means:
1) The library does not really need to provide an alloca function.
2) But it needs a stub, for when compiling without optimization, to avoid
a link error.
I'm therefore applying this:
2010-05-24 Bruno Haible <br...@clisp.org>
regex: Don't require alloca.
* modules/regex (Depends-on): Remove alloca. Add alloca-opt.
* lib/regex_internal.h (alloca): Ensure it's defined even if we call it
only inside if (0).
--- lib/regex_internal.h.orig Mon May 24 12:16:22 2010
+++ lib/regex_internal.h Mon May 24 12:15:28 2010
@@ -467,6 +467,8 @@
# else
/* alloca is implemented with malloc, so just use malloc. */
# define __libc_use_alloca(n) 0
+# undef alloca
+# define alloca(n) malloc (n)
# endif
#endif
--- modules/regex.orig Mon May 24 12:16:22 2010
+++ modules/regex Mon May 24 12:13:43 2010
@@ -12,7 +12,7 @@
m4/mbstate_t.m4
Depends-on:
-alloca
+alloca-opt
btowc
extensions
gettext-h
