From: Kevin Ryde <user42@zip.com.au>
Date: Sat, 21 Jun 2003 00:01:04 +0000 (+0000)
Subject: (_AC_PROG_CC_STDC): Extend test program to get an
X-Git-Tag: AUTOCONF-2.57b~51
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc17cd9dac5ccb26df57a2e3a72dde17150376a2;p=thirdparty%2Fautoconf.git

(_AC_PROG_CC_STDC): Extend test program to get an
error from OSF 4.0 Compaq cc in its default almost-ANSI mode, thereby
ensuring we add -std1 for full-ANSI.
---

diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index 248bc644..a560562b 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -805,6 +805,16 @@ static char *f (char * (*g) (char **, int), char **p, ...)
   va_end (v);
   return s;
 }
+
+/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default.  It has
+   function prototypes and stuff, but not '\xHH' hex character constants.
+   These don't provoke an error unfortunately, instead are silently treated
+   as 'x'.  The following induces an error, until -std1 is added to get
+   proper ANSI mode.  Curiously '\x00'!='x' always comes out true, for an
+   array size at least.  It's necessary to write '\x00'==0 to get something
+   that's true only with -std1.  */
+int osf4_cc_array ['\x00' == 0 ? 1 : -1];
+
 int test (int i, double x);
 struct s1 {int (*f) (int a);};
 struct s2 {int (*f) (double a);};