When cross-compiling, I also see:
checking whether strerror(0) succeeds... guessing no
For glibc platforms, this can be improved. Objections, Eric?
2012-05-01 Bruno Haible <br...@clisp.org>
strerror: Avoid "guessing no" when cross-compiling to glibc systems.
* m4/strerror.m4 (gl_FUNC_STRERROR_0): Require AC_CANONICAL_HOST. When
cross-compiling to a glibc platform, set gl_cv_func_strerror_0_works
to "guessing yes".
--- m4/strerror.m4.orig Wed May 2 00:14:49 2012
+++ m4/strerror.m4 Wed May 2 00:13:41 2012
@@ -48,6 +48,7 @@
dnl return a string that matches strerror(-1)).
AC_DEFUN([gl_FUNC_STRERROR_0],
[
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
REPLACE_STRERROR_0=0
AC_CACHE_CHECK([whether strerror(0) succeeds],
[gl_cv_func_strerror_0_works],
@@ -67,12 +68,20 @@
return result;]])],
[gl_cv_func_strerror_0_works=yes],
[gl_cv_func_strerror_0_works=no],
- [dnl Be pessimistic on cross-compiles for now.
- gl_cv_func_strerror_0_works="guessing no"])
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_strerror_0_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_strerror_0_works="guessing no" ;;
+ esac
+ ])
])
- if test "$gl_cv_func_strerror_0_works" != yes; then
- REPLACE_STRERROR_0=1
- AC_DEFINE([REPLACE_STRERROR_0], [1], [Define to 1 if strerror(0)
- does not return a message implying success.])
- fi
+ case "$gl_cv_func_strerror_0_works" in
+ *yes) ;;
+ *)
+ REPLACE_STRERROR_0=1
+ AC_DEFINE([REPLACE_STRERROR_0], [1], [Define to 1 if strerror(0)
+ does not return a message implying success.])
+ ;;
+ esac
])
