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If the compile-test says

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strerror_r doesn't work, then resort to a `run'-test that works on
BeOS and segfaults on DEC Unix.
This commit is contained in:
Jim Meyering
2000-06-24 21:04:44 +00:00
parent d488baf54a
commit 402a8fdd9b
1 changed files with 29 additions and 6 deletions
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m4/strerror_r.m4
+29 -6
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@@ -1,5 +1,7 @@
#serial 1000
# Experimental replacement for the function in the latest CVS autoconf.
# If the compile-test says strerror_r doesn't work, then resort to a
# `run'-test that works on BeOS and segfaults on DEC Unix.
# Use with the error.c file in ../lib.
undefine([AC_FUNC_STRERROR_R])
@@ -21,12 +23,6 @@ if test $ac_cv_func_strerror_r = yes; then
# if HAVE_STRING_H
# include <string.h>
# endif
#ifndef HAVE_DECL_STRERROR_R
"this configure-time declaration test was not run"
#endif
#if !HAVE_DECL_STRERROR_R
char *strerror_r ();
#endif
],
[
char buf;
@@ -35,6 +31,33 @@ char *strerror_r ();
ac_cv_func_strerror_r_works=yes,
ac_cv_func_strerror_r_works=no
)
if test $ac_cv_func_strerror_r_works = no; then
# strerror_r seems not to work, but now we have to choose between
# systems that have relatively inaccessible declarations for the
# function. BeOS and DEC UNIX 4.0 fall in this category, but the
# former has a strerror_r that returns char*, while the latter
# has a strerror_r that returns `int'.
# This test should segfault on the DEC system.
AC_TRY_RUN(
[
# include <stdio.h>
# include <string.h>
extern char *strerror_r ();
int
main ()
{
char buf[2];
char x = *strerror_r (0, buf, sizeof buf);
exit (x && !isalpha (x));
}
],
ac_cv_func_strerror_r_works=yes,
ac_cv_func_strerror_r_works=no,
ac_cv_func_strerror_r_works=no)
fi
if test $ac_cv_func_strerror_r_works = yes; then
AC_DEFINE_UNQUOTED(HAVE_WORKING_STRERROR_R, 1,
[Define to 1 if `strerror_r' returns a string.])