- AC_REQUIRE([gl_FUNC_STRERROR_SEPARATE])
- if test $gl_cv_func_working_strerror = no; then
- AC_LIBOBJ([strerror])
- AC_DEFINE_UNQUOTED([REPLACE_STRERROR], [$REPLACE_STRERROR],
- [Define this to 1 if strerror is broken.])
+ AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+ AC_REQUIRE([gl_HEADER_ERRNO_H])
+ AC_REQUIRE([gl_FUNC_STRERROR_0])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
+ AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
+ ])
+ if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
+ AC_CACHE_CHECK([for working strerror function],
+ [gl_cv_func_working_strerror],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ ]],
+ [[if (!*strerror (-2)) return 1;]])],
+ [gl_cv_func_working_strerror=yes],
+ [gl_cv_func_working_strerror=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_working_strerror="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_working_strerror="guessing no" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_working_strerror" in
+ *yes) ;;
+ *)
+ dnl The system's strerror() fails to return a string for out-of-range
+ dnl integers. Replace it.
+ REPLACE_STRERROR=1
+ ;;
+ esac
+ m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
+ dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's
+ dnl buffer, we must replace strerror.
+ case "$gl_cv_func_strerror_r_works" in
+ *no) REPLACE_STRERROR=1 ;;
+ esac
+ ])
+ else
+ dnl The system's strerror() cannot know about the new errno values we add
+ dnl to <errno.h>, or any fix for strerror(0). Replace it.
+ REPLACE_STRERROR=1