- AC_CACHE_CHECK([for working strerror function],
- [gl_cv_func_working_strerror],
- [AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [#include <string.h>
- ],
- [return !*strerror (-2);])],
- [gl_cv_func_working_strerror=yes],
- [gl_cv_func_working_strerror=no],
- [dnl Assume crossbuild works if it compiles.
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [#include <string.h>
- ],
- [return !*strerror (-2);])],
- [gl_cv_func_working_strerror=yes],
- [gl_cv_func_working_strerror=no])])])
- if test $gl_cv_func_working_strerror = no ; then
+ AC_REQUIRE([gl_HEADER_ERRNO_H])
+ if test -z "$ERRNO_H"; then
+ AC_CACHE_CHECK([for working strerror function],
+ [gl_cv_func_working_strerror],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ ]],
+ [[return !*strerror (-2);]])],
+ [gl_cv_func_working_strerror=yes],
+ [gl_cv_func_working_strerror=no],
+ [dnl Assume crossbuild works if it compiles.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ ]],
+ [[return !*strerror (-2);]])],
+ [gl_cv_func_working_strerror=yes],
+ [gl_cv_func_working_strerror=no])
+ ])
+ ])
+ if test $gl_cv_func_working_strerror = no; then
+ dnl The system's strerror() fails to return a string for out-of-range
+ dnl integers. Replace it.
+ REPLACE_STRERROR=1
+ fi
+ else
+ dnl The system's strerror() cannot know about the new errno values we add
+ dnl to <errno.h>. Replace it.