- AC_TRY_COMPILE(
- [
-# include <stdio.h>
-# if HAVE_STRING_H
-# include <string.h>
-# endif
-#ifndef HAVE_DECL_STRERROR_R
-"this configure-time declaration test was not run"
-#endif
-#if !HAVE_DECL_STRERROR_R
-char *strerror_r ();
-#endif
- ],
- [
- char buf;
- char x = *strerror_r (0, &buf, sizeof buf);
- ],
- ac_cv_func_strerror_r_works=yes,
- ac_cv_func_strerror_r_works=no
- )
- if test $ac_cv_func_strerror_r_works = yes; then
- AC_DEFINE_UNQUOTED(HAVE_WORKING_STRERROR_R, 1,
- [Define to 1 if `strerror_r' returns a string.])
+ ac_cv_func_strerror_r_char_p=no
+ if test $ac_cv_have_decl_strerror_r = yes; then
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
+ [[
+ char buf[100];
+ char x = *strerror_r (0, buf, sizeof buf);
+ char *p = strerror_r (0, buf, sizeof buf);
+ ]])],
+ ac_cv_func_strerror_r_char_p=yes)
+ else
+ # strerror_r is not declared. Choose between
+ # systems that have relatively inaccessible declarations for the
+ # function. BeOS and DEC UNIX 4.0 fall in this category, but the
+ # former has a strerror_r that returns char*, while the latter
+ # has a strerror_r that returns `int'.
+ # This test should segfault on the DEC system.
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
+ extern char *strerror_r ();],
+ [[char buf[100];
+ char x = *strerror_r (0, buf, sizeof buf);
+ exit (!isalpha (x));]])],
+ ac_cv_func_strerror_r_char_p=yes, , :)