From: Ryan Bloom <rbb@apache.org>
Date: Thu, 23 Dec 1999 21:01:31 +0000 (+0000)
Subject: First stab at logic to determine which threading library to use.  This also
X-Git-Tag: 1.3.10~52
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=84f9b5d2c6e246d0b228605a9d4bd65522cf0d42;p=apache

First stab at logic to determine which threading library to use.  This also
gets rid of the hack of always putting -pthread in the CFLAGS variable.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@84363 13f79535-47bb-0310-9956-ffa450edef68
---

diff --git a/acinclude.m4 b/acinclude.m4
index f45bc2ce1e..57c8bf78b9 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -95,3 +95,46 @@ AC_DEFUN(APACHE_ONCE,[
   fi
 ])
 
+dnl
+dnl APACHE_CHECK_THREADS()
+dnl
+dnl Determine the best flags for linking against a threading library.
+dnl
+AC_DEFUN(THREAD_TEST, [
+AC_TRY_RUN( [
+#include <pthread.h>
+
+void *thread_routine(void *data) {
+    return data;
+}
+
+int main() {
+    pthread_t thd;
+    int data = 1;
+    return pthread_create(&thd, NULL, thread_routine, &data);
+} ], [ 
+  THREADS_WORKING="yes"
+  ], [
+  THREADS_WORKING="no"
+  ], THREADS_WORKING="no" ) ] )
+
+define(APACHE_CHECK_THREADS, [dnl
+  cflags_orig="$CFLAGS"
+  ldflags_orig="$LDFLAGS"
+  for test_cflag in $1; do
+    for test_ldflag in $2; do
+      CFLAGS="$test_cflag $cflags_orig"
+      LDFLAGS="$test_ldflag $ldflags_orig"
+      THREAD_TEST()
+      if test "$THREADS_WORKING" = "yes"; then
+        break
+      fi
+    done
+    if test "$THREADS_WORKING" = "yes"; then
+      threads_result="Updating CFLAGS and LDFLAGS"
+      break
+    fi
+      threads_result="Threads not found"
+  done
+] )
+        
diff --git a/configure.in b/configure.in
index 58205e3aa0..bdf03dd910 100644
--- a/configure.in
+++ b/configure.in
@@ -73,6 +73,10 @@ AC_TYPE_PID_T
 
 dnl ## Check for library functions
 
+AC_MSG_CHECKING([for which threading library to use])
+APACHE_CHECK_THREADS('' -pthread -D_REENTRANT, '' -lpthread -lc_r)
+AC_MSG_RESULT("$threads_result")
+
 dnl See Comment #Spoon
 
 AC_CHECK_FUNCS( \
diff --git a/server/mpm/config.m4 b/server/mpm/config.m4
index 3af2173aea..7ab84353e0 100644
--- a/server/mpm/config.m4
+++ b/server/mpm/config.m4
@@ -46,8 +46,6 @@ AC_DEFUN(APACHE_MPM_PTHREAD, [
 
 dnl XXX - We should be checking for the proper flags to use on a particular 
 dnl platform. This will cover a couple of them, anyway
-    CFLAGS="-pthread $CFLAGS"
-    CXXFLAGS="-pthread $CXXFLAGS"
 
     AC_CHECK_HEADER(pthread.h, [ ],[
         AC_MSG_ERROR(This MPM requires pthreads. Try --with-mpm=prefork.)