configure: Move pthreads checks to macro

1 files changed, 101 insertions, 0 deletions

diff --git a/m4/fp_check_pthreads.m4 b/m4/fp_check_pthreads.m4
new file mode 100644
index 0000000000..008b97d482
--- /dev/null
+++ b/m4/fp_check_pthreads.m4
@@ -0,0 +1,101 @@
+dnl FP_CHECK_PTHREADS
+dnl ----------------------------------
+dnl Check various aspects of the platform's pthreads support
+AC_DEFUN([FP_CHECK_PTHREADS],
+[
+  dnl Some platforms (e.g. Android's Bionic) have pthreads support available
+  dnl without linking against libpthread. Check whether -lpthread is necessary
+  dnl to use pthreads.
+  dnl
+  dnl Note that it is important that this happens before we AC_CHECK_LIB(thread)
+  AC_MSG_CHECKING(whether -lpthread is needed for pthreads)
+  AC_CHECK_FUNC(pthread_create,
+      [
+          AC_MSG_RESULT(no)
+          AC_SUBST([CabalNeedLibpthread],[False])
+          need_lpthread=0
+      ],
+      [
+          AC_CHECK_LIB(pthread, pthread_create,
+              [
+                  AC_MSG_RESULT(yes)
+                  AC_SUBST([CabalNeedLibpthread],[True])
+                  need_lpthread=1
+              ],
+              [
+                  AC_SUBST([CabalNeedLibpthread],[False])
+                  AC_MSG_RESULT([no pthreads support found.])
+                  need_lpthread=0
+              ])
+      ])
+  AC_DEFINE_UNQUOTED([NEED_PTHREAD_LIB], [$need_lpthread],
+      [Define 1 if we need to link code using pthreads with -lpthread])
+
+  dnl Setting thread names
+  dnl ~~~~~~~~~~~~~~~~~~~~
+  dnl The portability situation here is complicated:
+  dnl
+  dnl * FreeBSD supports pthread_set_name_np in <pthread_np.h>
+  dnl   and (if not _POSIX_SOURCE) pthread_setname_np() in <pthread.h>
+  dnl   because of the conditional visibility, we prefer the former.
+  dnl * glibc supports pthread_setname_np
+  dnl * Darwin supports pthread_setname_np but does not take a
+  dnl   pthread_t argument.
+  dnl
+  AC_CHECK_HEADERS([pthread_np.h])
+
+  dnl ** pthread_setname_np is a recent addition to glibc, and OS X has
+  dnl    a different single-argument version.
+  AC_CHECK_LIB(pthread, pthread_setname_np)
+
+  AC_MSG_CHECKING([for pthread_setname_np (Darwin)])
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM(
+      [[
+      #include <pthread.h>
+      ]],
+      [[pthread_setname_np("name");]]
+    )],
+    [
+      AC_MSG_RESULT(yes)
+      AC_DEFINE([HAVE_PTHREAD_SETNAME_NP_DARWIN], [1],
+        [Define to 1 if you have the Darwin version of pthread_setname_np])
+    ],
+    AC_MSG_RESULT(no)
+  )
+
+  dnl glibc
+  AC_MSG_CHECKING([for pthread_setname_np (glibc)])
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM(
+      [[
+      #define _GNU_SOURCE
+      #include <pthread.h>
+      ]],
+      [[pthread_setname_np(pthread_self(), "name");]]
+    )],
+    [
+      AC_MSG_RESULT(yes)
+      AC_DEFINE([HAVE_PTHREAD_SETNAME_NP], [1],
+        [Define to 1 if you have the glibc version of pthread_setname_np])
+    ],
+    AC_MSG_RESULT(no)
+  )
+
+  dnl FreeBSD
+  AC_MSG_CHECKING([for pthread_set_name_np])
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM(
+      [[
+      #include <pthread_np.h>
+      ]],
+      [[pthread_set_name_np(pthread_self(), "name");]]
+    )],
+    [
+      AC_MSG_RESULT(yes)
+      AC_DEFINE([HAVE_PTHREAD_SET_NAME_NP], [1],
+        [Define to 1 if you have pthread_set_name_np])
+    ],
+    AC_MSG_RESULT(no)
+  )
+])