+ fi
+
+ AC_CHECK_FUNCS([strsignal])
+ if test $ac_cv_func_strsignal = yes; then
+ dnl Check if strsignal behaves reasonably for out-of-range signal numbers.
+ dnl On Solaris it returns NULL; on AIX 5.1 it returns (char *) -1.
+ AC_CACHE_CHECK([whether strsignal always returns a string],
+ [gl_cv_func_working_strsignal],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+#include <unistd.h> /* NetBSD 5.0 declares it in wrong header. */
+ ]],
+ [[int result = 0;
+ char *s = strsignal (-1);
+ if (s == (char *) 0)
+ result |= 1;
+ if (s == (char *) -1)
+ result |= 2;
+ return result;
+ ]])],
+ [gl_cv_func_working_strsignal=yes],
+ [gl_cv_func_working_strsignal=no],
+ [case "$host_os" in
+ solaris* | aix*) gl_cv_func_working_strsignal=no;;
+ *) gl_cv_func_working_strsignal="guessing yes";;
+ esac])])
+ else
+ gl_cv_func_working_strsignal=no
+ fi
+
+ if test "$gl_cv_func_working_strsignal" = no; then
+ if test $ac_cv_func_strsignal = yes; then
+ REPLACE_STRSIGNAL=1
+ fi
+ AC_LIBOBJ([strsignal])