cmake,readme: Move Waffle's CMake options to new file Options.cmake

This makes it easy for users to find all the custom CMake options
defined by Waffle. Update the README accordingly.

Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

3 files changed, 19 insertions, 34 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cfbcdb0..2714b83 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,7 @@ set(waffle_soversion "0")
 # Includes
 # ------------------------------------------------------------------------------
 
+include(Options.cmake)
 include(CheckThreadLocalStorage)
 
 #
@@ -74,35 +75,6 @@ set(PROJECT_NAME "waffle")
 
 find_package(PkgConfig)
 
-
-# ------------------------------------------------------------------------------
-# Waffle Options
-# ------------------------------------------------------------------------------
-
-# All options here are prefixed with `waffle_`. Most options are cache
-# variables set by the user.
-
-# ----------------------------------------------
-# Set waffle options
-# ----------------------------------------------
-
-option(waffle_build_tests "Build tests" ON)
-
-# Most users don't have the necessary tools installed to build from
-# Docbook sources, so require users to explicitly enable building them.
-option(waffle_build_manpages "Build manpages" OFF)
-option(waffle_build_htmldoc "Build html documentation" OFF)
-
-option(waffle_build_examples "Build examples" ON)
-
-option(waffle_has_glx "Build support for GLX" OFF)
-option(waffle_has_wayland "Build support for Wayland" OFF)
-option(waffle_has_x11_egl "Build support for X11/EGL" OFF)
-option(waffle_has_gbm "Build support for GBM" OFF)
-
-set(waffle_xsltproc "xsltproc"
-    CACHE STRING "Tool used to process XSLT stylesheets")
-
 # ----------------------------------------------
 # Emit errors for removed options
 # ----------------------------------------------
diff --git a/Options.cmake b/Options.cmake
new file mode 100644
index 0000000..cc50dc5
--- /dev/null
+++ b/Options.cmake
@@ -0,0 +1,15 @@
+if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
+    # On Linux, you must enable at least one of the below options.
+    option(waffle_has_glx "Build support for GLX" OFF)
+    option(waffle_has_wayland "Build support for Wayland" OFF)
+    option(waffle_has_x11_egl "Build support for X11/EGL" OFF)
+    option(waffle_has_gbm "Build support for GBM" OFF)
+endif()
+
+option(waffle_build_tests "Build tests" ON)
+option(waffle_build_manpages "Build manpages" OFF)
+option(waffle_build_htmldoc "Build html documentation" OFF)
+option(waffle_build_examples "Build example programs" ON)
+
+set(waffle_xsltproc "xsltproc"
+    CACHE STRING "Program for processing XSLT stylesheets. Used for building docs.")
diff --git a/README.txt b/README.txt
index 28904f3..97aeac3 100644
--- a/README.txt
+++ b/README.txt
@@ -121,9 +121,8 @@ a dependeny into /usr/local, then:
     export PKG_CONFIG_PATH=/usr/local/share/pkgconfig:/usr/local/$libdir/pkgconfig:$PKG_CONFIG_PATH
 
 
-2. Configure Waffle with CMake
--------------------------------
-
+2. Configure CMake
+------------------
 On Linux, you likely want to call cmake with the following
 arguments.  It configures Waffle in debug mode and with support for only GLX.
 
@@ -136,8 +135,7 @@ If in addition to GLX you want support for X11/EGL, then add
 -Dwaffle_has_x11_egl=1 to the cmake arguments. Likewise for Wayland, add
 -Dwaffle_has_wayland=1; and for GBM, add -Dwaffle_has_gbm=1.
 
-To build the manpages, add -Dwaffle_build_manpages=1. To build the html
-documentation, add -Dwaffle_build_htmldocs=1.
+For the full list of Waffle's custom CMake options, see file `Options.cmake`.
 
 To install into a custom location, autoconf-esque variables such
 as CMAKE_INSTALL_LIBDIR are supported. See