-# AC_FUNC_STRERROR_R
-# ------------------
-AC_DEFUN([AC_FUNC_STRERROR_R],
-[AC_CHECK_DECLS([strerror_r])
-AC_CHECK_FUNCS([strerror_r])
-AC_CACHE_CHECK([whether strerror_r returns char *],
- ac_cv_func_strerror_r_char_p,
- [
- 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)
+ dnl Some systems don't declare strerror_r() if _THREAD_SAFE and _REENTRANT
+ dnl are not defined.
+ AC_CHECK_DECLS_ONCE([strerror_r])
+ if test $ac_cv_have_decl_strerror_r = no; then
+ HAVE_DECL_STRERROR_R=0
+ fi
+
+ AC_CHECK_FUNCS([strerror_r])
+ if test $ac_cv_func_strerror_r = yes; then
+ if test -z "$ERRNO_H"; then
+ dnl The POSIX prototype is: int strerror_r (int, char *, size_t);
+ dnl glibc, Cygwin: char *strerror_r (int, char *, size_t);
+ dnl AIX 5.1, OSF/1 5.1: int strerror_r (int, char *, int);
+ AC_CACHE_CHECK([for strerror_r with POSIX signature],
+ [gl_cv_func_strerror_r_posix_signature],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ int strerror_r (int, char *, size_t);
+ ]],
+ [[return strerror (0);]])],
+ [gl_cv_func_strerror_r_posix_signature=yes],
+ [gl_cv_func_strerror_r_posix_signature=no])
+ ])
+ if test $gl_cv_func_strerror_r_posix_signature = yes; then
+ dnl AIX 6.1 strerror_r fails by returning -1, not an error number.
+ dnl HP-UX 11.31 strerror_r always fails when the buffer length argument
+ dnl is less than 80.
+ AC_CACHE_CHECK([whether strerror_r works],
+ [gl_cv_func_strerror_r_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <errno.h>
+ #include <string.h>
+ int strerror_r (int, char *, size_t);
+ ]],
+ [[int result = 0;
+ char buf[79];
+ if (strerror_r (EACCES, buf, 0) < 0)
+ result |= 1;
+ if (strerror_r (EACCES, buf, sizeof (buf)) != 0)
+ result |= 2;
+ return result;
+ ]])],
+ [gl_cv_func_strerror_r_works=yes],
+ [gl_cv_func_strerror_r_works=no],
+ [
+changequote(,)dnl
+ case "$host_os" in
+ # Guess no on AIX.
+ aix*) gl_cv_func_strerror_r_works="guessing no";;
+ # Guess no on HP-UX.
+ hpux*) gl_cv_func_strerror_r_works="guessing no";;
+ # Guess yes otherwise.
+ *) gl_cv_func_strerror_r_works="guessing yes";;
+ esac
+changequote([,])dnl
+ ])
+ ])
+ case "$gl_cv_func_strerror_r_works" in
+ *no) REPLACE_STRERROR_R=1 ;;
+ esac
+ else
+ dnl The system's strerror() has a wrong signature. Replace it.
+ REPLACE_STRERROR_R=1
+ dnl glibc >= 2.3.4 has a function __xpg_strerror_r.
+ AC_CHECK_FUNCS([__xpg_strerror_r])
+ fi