Only build the test suite on Linux

The test suite currently uses Linux-specific features such as epoll.
Signed-off-by: David Goulet <dgoulet@ev0ke.net>
Signed-off-by: Ian Goldberg <iang@cs.uwaterloo.ca>

ChangeLog

@@ -3,6 +3,10 @@
 	* tests/regression/client/Makefile.am:
 	* tests/unit/Makefile.am: Add LIBGCRYPT_CFLAGS to the test suite
 
+	* Makefile.am:
+	* configure.ac: Only build the test suite on Linux, since it
+	currently uses Linux-specific features such as epoll
+
 2016-03-06
 
 	* Makefile.am: Add bootstrap to the tarball

Makefile.am

 ACLOCAL_AMFLAGS = -I config
 
-SUBDIRS = src toolkit tests
+SUBDIRS = src toolkit
+if BUILD_TESTS
+SUBDIRS += tests
+endif
 
 EXTRA_DIST = Protocol-v3.html UPGRADING packaging libotr.m4 libotr.pc.in bootstrap
 

NEWS

@@ -4,7 +4,8 @@
   from there remote code execution) on 64-bit platforms
 - Fix possible free() of an uninitialized pointer
 - Be stricter about parsing v3 fragments
-- Add a testsuite ("make check" to run it)
+- Add a testsuite ("make check" to run it), but only on Linux for now,
+  since it uses Linux-specific features such as epoll
 - Fix a memory leak when reading a malformed instance tag file
 - Protocol documentation clarifications
 

configure.ac

@@ -30,6 +30,17 @@ LT_INIT
 
 AM_PATH_LIBGCRYPT(1:1.2.0,,AC_MSG_ERROR(libgcrypt 1.2.0 or newer is required.))
 
+AC_CANONICAL_HOST
+# Identify which OS we are building and do specific things based on the host
+case $host_os in
+  *linux*)
+    HOST_OS=linux
+    ;;
+esac
+
+# Build tests for now only for Linux.
+AM_CONDITIONAL([BUILD_TESTS], [test x$HOST_OS = xlinux])
+
 dnl 1:flags
 dnl Taken from Tor's autoconf magic repository
 AC_DEFUN([OTR_CHECK_CFLAGS], [