On FreeBSD 5.2.1/i386, a testdir shows many link errors for pthread_* functions.
Most of these functions exist in libthr.so; there is no libpthread in this
version of FreeBSD.
2023-10-15 Bruno Haible <br...@clisp.org>
threadlib: Fix link errors on FreeBSD 5.2.1/i386.
* m4/threadlib.m4 (gl_PTHREADLIB_BODY): When pthread_kill could not be
found in -lpthread, try -lthr.
diff --git a/m4/threadlib.m4 b/m4/threadlib.m4
index 303382881a..855e563d88 100644
--- a/m4/threadlib.m4
+++ b/m4/threadlib.m4
@@ -1,4 +1,4 @@
-# threadlib.m4 serial 39
+# threadlib.m4 serial 40
dnl Copyright (C) 2005-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -269,6 +269,15 @@ AC_DEFUN([gl_PTHREADLIB_BODY]
[Define if the pthread_in_use() detection is hard.])
esac
fi
+ ],
+ [dnl This is needed on FreeBSD 5.2.1.
+ AC_CHECK_LIB([thr], [pthread_kill],
+ [if test $gl_pthread_in_glibc = yes; then
+ LIBPMULTITHREAD=
+ else
+ LIBPMULTITHREAD=-lthr
+ fi
+ ])
])
elif test $gl_pthread_api != yes; then
# Some library is needed. Try libpthread and libc_r.
