Fix thread flags on Solaris

Also on other platforms use -pthread for compiling commands not just
linking because I noticed in the gcc(1) man page

  -pthread
      Adds support for multithreading with the pthreads library. This
      option sets flags for both the preprocessor and linker.

Removing the errno check in deps/coupling because it was a hack
(e165859c2e) added to fix stdio problems.
Without adding -threads, errno is not thread local, and coupling was not
correctly checking the errno. It appears -mt does nothing to gcc/solaris.

deps/coupling/coupling.c

@@ -180,7 +180,7 @@ pull_pump (int pullfd, int pushfd)
       /* eof */
       close(pullfd);
       pullfd = -1;
-    } else if (r < 0 && errno && errno != EINTR && errno != EAGAIN) {
+    } else if (r < 0 && errno != EINTR && errno != EAGAIN) {
       /* error */
       perror("pull_pump read()");
       close(pullfd);
@@ -192,7 +192,7 @@ pull_pump (int pullfd, int pushfd)
       /* non-blocking write() to the pipe */
       r = ring_buffer_push(&ring, pushfd);
 
-      if (r < 0 && errno && errno != EAGAIN && errno != EINTR) {
+      if (r < 0 && errno != EAGAIN && errno != EINTR) {
         if (errno == EPIPE) {
           /* This happens if someone closes the other end of the pipe.  This
            * is a normal forced close of STDIN. Hopefully there wasn't data
@@ -274,7 +274,7 @@ push_pump (int pullfd, int pushfd)
       /* eof */
       close(pullfd);
       pullfd = -1;
-    } else if (r < 0 && errno && errno != EINTR && errno != EAGAIN) {
+    } else if (r < 0 && errno != EINTR && errno != EAGAIN) {
       perror("push_pump read()");
       close(pullfd);
       pullfd = -1;
@@ -288,7 +288,7 @@ push_pump (int pullfd, int pushfd)
 
       /* If there was a problem, just exit the entire function */
 
-      if (r < 0 && errno && errno != EINTR && errno != EAGAIN) {
+      if (r < 0 && errno != EINTR && errno != EAGAIN) {
         close(pushfd);
         close(pullfd);
         pushfd = pullfd = -1;

wscript

@@ -168,6 +168,16 @@ def configure(conf):
 
   conf.define("HAVE_CONFIG_H", 1)
 
+  if sys.platform.startswith("sunos"):
+    conf.env.append_value ('CCFLAGS', '-threads')
+    conf.env.append_value ('CXXFLAGS', '-threads')
+    #conf.env.append_value ('LINKFLAGS', ' -threads')
+  else:
+    threadflags='-pthread'
+    conf.env.append_value ('CCFLAGS', threadflags)
+    conf.env.append_value ('CXXFLAGS', threadflags)
+    conf.env.append_value ('LINKFLAGS', threadflags)
+
   conf.env.append_value("CCFLAGS", "-DX_STACKSIZE=%d" % (1024*64))
 
   # LFS
@@ -272,10 +282,8 @@ def build_v8(bld):
   v8.uselib = "EXECINFO"
   bld.env["CPPPATH_V8"] = "deps/v8/include"
   t = join(bld.srcnode.abspath(bld.env_of_name("default")), v8.target)
-  if sys.platform.startswith("sunos"):
+  bld.env_of_name('default').append_value("LINKFLAGS_V8", t)
-    bld.env_of_name('default')["LINKFLAGS_V8"] = ["-mt", t]
+
-  else:
-    bld.env_of_name('default')["LINKFLAGS_V8"] = ["-pthread", t]
 
   ### v8 debug
   if bld.env["USE_DEBUG"]:
@@ -284,10 +292,7 @@ def build_v8(bld):
     v8_debug.target = bld.env["staticlib_PATTERN"] % "v8_g"
     v8_debug.uselib = "EXECINFO"
     t = join(bld.srcnode.abspath(bld.env_of_name("debug")), v8_debug.target)
-    if sys.platform.startswith("sunos"):
+    bld.env_of_name('debug').append_value("LINKFLAGS_V8", t)
-      bld.env_of_name('debug')["LINKFLAGS_V8"] = ["-mt", t]
-    else:
-      bld.env_of_name('debug')["LINKFLAGS_V8"] = ["-pthread", t]
 
   bld.install_files('${PREFIX}/include/node/', 'deps/v8/include/*.h')