From c7d2247e35bc095a0e1fb7dcca9af36d71f9408c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 25 Apr 2022 18:48:37 +0900
Subject: Honor --with-thread option to enable pthread

---
 tool/m4/ruby_thread.m4 | 51 ++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 47 insertions(+), 4 deletions(-)

(limited to 'tool/m4')

diff --git a/tool/m4/ruby_thread.m4 b/tool/m4/ruby_thread.m4
index 2e58eddb98..439c63bc22 100644
--- a/tool/m4/ruby_thread.m4
+++ b/tool/m4/ruby_thread.m4
@@ -5,6 +5,21 @@ AC_ARG_WITH(thread,
     [THREAD_MODEL=$withval], [
     THREAD_MODEL=
     AS_CASE(["$target_os"],
+        [freebsd*], [
+            AC_CACHE_CHECK([whether pthread should be enabled by default],
+                rb_cv_enable_pthread_default,
+                [AC_PREPROC_IFELSE([AC_LANG_SOURCE([[
+@%:@include <osreldate.h>
+@%:@if __FreeBSD_version < 502102
+@%:@error pthread should be disabled on this platform
+@%:@endif
+                    ]])],
+                    rb_cv_enable_pthread_default=yes,
+                    rb_cv_enable_pthread_default=no)])
+            AS_IF([test $rb_cv_enable_pthread_default = yes],
+                [THREAD_MODEL=pthread],
+                [THREAD_MODEL=none])
+        ],
         [mingw*], [
             THREAD_MODEL=win32
         ],
@@ -12,19 +27,47 @@ AC_ARG_WITH(thread,
             THREAD_MODEL=none
         ],
         [
-            AS_IF([test "$rb_with_pthread" = "yes"], [
-                THREAD_MODEL=pthread
-            ])
+            THREAD_MODEL=pthread
         ]
     )
 ])
 
+AS_IF([test x"$THREAD_MODEL" = xpthread], [
+    AC_CHECK_HEADERS(pthread.h)
+    AS_IF([test x"$ac_cv_header_pthread_h" = xyes], [], [
+	AC_MSG_WARN("Don't know how to find pthread header on your system -- thread support disabled")
+        THREAD_MODEL=none
+    ])
+])
+AS_IF([test x"$THREAD_MODEL" = xpthread], [
+    THREAD_MODEL=none
+    for pthread_lib in thr pthread pthreads c c_r root; do
+	AC_CHECK_LIB($pthread_lib, pthread_create,
+		     [THREAD_MODEL=pthread; break])
+    done
+    AS_IF([test x"$THREAD_MODEL" = xpthread], [
+	AC_DEFINE(_REENTRANT)
+	AC_DEFINE(_THREAD_SAFE)
+	AC_DEFINE(HAVE_LIBPTHREAD)
+	AC_CHECK_HEADERS(pthread_np.h, [], [], [@%:@include <pthread.h>])
+	AS_CASE(["$pthread_lib:$target_os"],
+		[c:*], [],
+		[root:*], [],
+		[c_r:*|*:openbsd*|*:mirbsd*],  [LIBS="-pthread $LIBS"],
+		[LIBS="-l$pthread_lib $LIBS"])
+    ], [
+	AC_MSG_WARN("Don't know how to find pthread library on your system -- thread support disabled")
+    ])
+])
+
 AS_CASE(["$THREAD_MODEL"],
-[pthread], [AC_CHECK_HEADERS(pthread.h)],
+[pthread], [],
 [win32],   [],
 [none],    [],
 [""],      [AC_MSG_ERROR(thread model is missing)],
            [AC_MSG_ERROR(unknown thread model $THREAD_MODEL)])
+AC_MSG_CHECKING(thread model)
+AC_MSG_RESULT($THREAD_MODEL)
 
 THREAD_IMPL_H=thread_$THREAD_MODEL.h
 AS_IF([test ! -f "$srcdir/$THREAD_IMPL_H"],
-- 
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