[PATCH 1/2] regex: support Gawk, which never uses alloca

[Paul Eggert]

* lib/regex_internal.h [!_LIBC && !HAVE_ALLOCA]:
Do not include in this case.  Gawk doesn't supply a substitute
alloca.h and doesn't need one.
---
 ChangeLog            | 5 +++++
 lib/regex_internal.h | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index cab9521..cbbc5b4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2013-01-01  Paul Eggert  <address@hidden>
 
+       regex: support Gawk, which never uses alloca
+       * lib/regex_internal.h [!_LIBC && !HAVE_ALLOCA]:
+       Do not include in this case.  Gawk doesn't supply a substitute
+       alloca.h and doesn't need one.
+
        regex: port __libc_lock_define usage to C89
        * lib/regex_internal.h (__libc_lock_define) [!_LIBC]: Remove.
        (struct re_dfa_t): Use #ifdef instead.  '__libc_lock_define (, lock)'
diff --git a/lib/regex_internal.h b/lib/regex_internal.h
index 43fae40..fa93382 100644
--- a/lib/regex_internal.h
+++ b/lib/regex_internal.h
@@ -445,7 +445,9 @@ static unsigned int re_string_context_at (const re_string_t 
*input, Idx idx,
 #define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
 #define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
 
-#include <alloca.h>
+#if defined _LIBC || HAVE_ALLOCA
+# include <alloca.h>
+#endif
 
 #ifndef _LIBC
 # if HAVE_ALLOCA
-- 
1.7.11.7