Hi,
When -ansi is passed to GCC, strdup becomes unavailable on MSYS/MinGW,
but autoconf still detects the existence of strdup. The mingw string.h
is in /mingw/include/string.h, and includes some funny stuff with
#ifndef __STRICT_ANSI__ and later #ifndef _NO_OLDNAMES. The former gets
defined by GCC with -ansi, the latter I couldn't see where it gets
defined if at all.
Chris
mkdir src
cat >configure.ac <<\END
AC_INIT(a,1)
AM_INIT_AUTOMAKE(foreign)
AC_CONFIG_FILES(Makefile src/Makefile)
AC_PROG_CC
AC_PROG_LIBTOOL
AC_REPLACE_FUNCS([strdup])
AC_CONFIG_HEADERS([config.h])
AC_OUTPUT
END
cat >Makefile.am <<\END
SUBDIRS = src
END
cat >src/Makefile.am <<\END
libcheck_la_LIBADD = @LTLIBOBJS@
lib_LTLIBRARIES = libcheck.la
END
cat >src/libcheck.c <<\END
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#if !HAVE_STRDUP
char *strdup (const char *str);
#endif /* !HAVE_STRDUP */
void use_strdup (void)
{
strdup (NULL);
}
END
cat >src/strdup.c <<\END
char *
strdup (const char *str)
{
/* obviously this is broken */
return NULL;
}
END
autoreconf -vif # all is fine, src/strdup.c is there
CFLAGS="-Wall -ansi" ./configure # says yes for strdup (incorrectly)
make # libcheck.c:13: warning: implicit declaration of function `strdup'
make clean
CFLAGS="-Wall" ./configure # says yes for strdup (correctly)
make # libcheck.c:13: warning: null argument where non-null required (arg 1)
