Added description for build options. (#886)

* Added build options description.
* Added entry info in README.
* Removed unnecessary descriptions in cmake.
* Fixed duplicated enable-unittests.

CMakeLists.txt

@@ -109,15 +109,6 @@ option(ENABLE_CXX_DEPS "Extra library dependencies in srt.pc for the CXX librari
 option(USE_STATIC_LIBSTDCXX "Should use static rather than shared libstdc++" OFF)
 option(ENABLE_INET_PTON "Set to OFF to prevent usage of inet_pton when building against modern SDKs while still requiring compatibility with older Windows versions, such as Windows XP, Windows Server 2003 etc." ON)
 option(ENABLE_CODE_COVERAGE "Enable code coverage reporting" OFF)
-
-# ENABLE_MONOTONIC_CLOCK: enforces the use of clock_gettime to get the current
-# time, instead of gettimeofday. This function allows to force a monotonic
-# clock, which is independent on the currently set time in the system.  The CV,
-# for which the *_timedwait() functions are used with so obtained current time,
-# must be appropriately configured. The consequence of enabling this option,
-# however, may be portability issues around the clock_gettime() function, which
-# is not available on every SDK, or extra -lrt option is sometimes required
-# (this requirement will be autodetected).
 option(ENABLE_MONOTONIC_CLOCK "Enforced clock_gettime with monotonic clock on GC CV /temporary fix for #729/" OFF)
 option(USE_OPENSSL_PC "Use pkg-config to find OpenSSL libraries" ON)
 option(USE_BUSY_WAITING "Enable more accurate sending times at a cost of potentially higher CPU load" OFF)

README.md

@@ -41,6 +41,8 @@ As audio/video packets are streamed from a source to a destination device, SRT d
 * OpenSSL
 * Pthreads (for POSIX systems it's builtin, for Windows there's a library)
 
+For detailed description of the build system and options, please read [BuildOptions.md](docs/BuildOptions.md).
+
 ## For Linux:
 
 Install cmake and openssl-devel (or similar name) package. For pthreads

configure-data.tcl

@@ -35,7 +35,6 @@ set internal_options {
 set cmake_options {
     cygwin-use-posix "Should the POSIX API be used for cygwin. Ignored if the system isn't cygwin. (default: OFF)"
     enable-encryption "Should encryption features be enabled (default: ON)"
-    enable-unittests "Should the unit tests be enabled (default: OFF)"
     enable-c++11 "Should the c++11 parts (srt-live-transmit) be enabled (default: ON)"
     enable-apps "Should the Support Applications be Built? (default: ON)"
     enable-testing "Should developer testing applications be built (default: OFF)"