From cee21eb6a7752f90fe3e2ee260a31ce0a9eeaaa0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Fita?= <michal.fita@gmail.com>
Date: Thu, 23 Jul 2015 10:38:49 +0100
Subject: configure: add --disable-rt option

This option disables any attempts in configure to create dependency on
stuff requiring linking to librt.so and libpthread.so, in this case this
means clock_gettime(CLOCK_MONOTONIC, &mt).

We were in need to build curl which doesn't link libpthread.so to avoid
the following bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=16628.
---
 m4/curl-confopts.m4 | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'm4')

diff --git a/m4/curl-confopts.m4 b/m4/curl-confopts.m4
index 44b018e40..05c2d4b10 100644
--- a/m4/curl-confopts.m4
+++ b/m4/curl-confopts.m4
@@ -316,6 +316,42 @@ dnl     AC_MSG_ERROR([options --enable-ares and --enable-threads are mutually ex
 dnl   fi
 dnl ])
 
+dnl CURL_CHECK_OPTION_RT
+dnl -------------------------------------------------
+dnl Verify if configure has been involed with option
+dnl --disable-rt and set shell variable dontwant_rt
+dnl as appropriate.
+
+AC_DEFUN([CURL_CHECK_OPTION_RT], [
+  AC_BEFORE([$0], [CURL_CHECK_LIB_THREADS])dnl
+  AC_MSG_CHECKING([whether to disable dependency on -lrt])
+  OPT_RT="default"
+  AC_ARG_ENABLE(rt,
+ AC_HELP_STRING([--disable-rt],[disable dependency on -lrt]),
+  OPT_RT=$enableval)
+  case "$OPT_RT" in
+    no)
+      dnl --disable-rt used (reverse logic)
+      dontwant_rt="yes"
+      AC_MSG_RESULT([yes])
+      ;;
+    default)
+      dnl configure option not specified (so not disabled)
+      dontwant_rt="no"
+      AC_MSG_RESULT([(assumed no)]
+      ;;
+    *)
+      dnl --enable-rt option used (reverse logic)
+      dontwant_rt="no"
+      AC_MSG_RESULT([no])
+      ;;
+  esac
+  dnl TODO: may require mutual exclusion
+  if test "$dontwant_rt" = "yes" && test "$want_thres" = "yes" ; then
+    AC_MSG_ERROR([options --disable-rt and --enable-thread-resolver are mutually exclusive, at most one can be selected.])
+  fi
+])
+ 
 
 dnl CURL_CHECK_OPTION_WARNINGS
 dnl -------------------------------------------------
-- 
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