[OE-core] [PATCH 1/2] cmake: allow the generator to be changed

[Ross Burton]

Add OECMAKE_GENERATOR variable to control which generator is used by CMake,
defaulting to the upstream default of Unix Makefiles for now.  The other
supported option is Ninja, which is faster than Make for large projects (for
example, using Ninja takes three minutes off webkitgtk:do_compile for me).

Signed-off-by: Ross Burton <ross.burton at intel.com>
---
 meta/classes/cmake.bbclass | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/meta/classes/cmake.bbclass b/meta/classes/cmake.bbclass
index 55698e60e53..74a952142ff 100644
--- a/meta/classes/cmake.bbclass
+++ b/meta/classes/cmake.bbclass
@@ -7,6 +7,23 @@ B = "${WORKDIR}/build"
 # We need to unset CCACHE otherwise cmake gets too confused
 CCACHE = ""
 
+# What CMake generator to use.
+# The supported options are "Unix Makefiles" or "Ninja".
+OECMAKE_GENERATOR ?= "Unix Makefiles"
+
+python() {
+    generator = d.getVar("OECMAKE_GENERATOR")
+    if generator == "Unix Makefiles":
+        args = "-G 'Unix Makefiles' -DCMAKE_MAKE_PROGRAM=" + d.getVar("MAKE")
+        d.setVar("OECMAKE_GENERATOR_ARGS", args)
+        d.setVarFlag("do_compile", "progress", "percent")
+    elif generator == "Ninja":
+        d.appendVar("DEPENDS", " ninja-native")
+        d.setVar("OECMAKE_GENERATOR_ARGS", "-G Ninja -DCMAKE_MAKE_PROGRAM=ninja")
+        d.setVarFlag("do_compile", "progress", "outof:^\[(\d+)/(\d+)\]\s+")
+    else:
+        bb.fatal("Unknown CMake Generator %s" % generator)
+}
 # C/C++ Compiler (without cpu arch/tune arguments)
 OECMAKE_C_COMPILER ?= "`echo ${CC} | sed 's/^\([^ ]*\).*/\1/'`"
 OECMAKE_CXX_COMPILER ?= "`echo ${CXX} | sed 's/^\([^ ]*\).*/\1/'`"
@@ -121,9 +138,9 @@ cmake_do_configure() {
 	fi
 
 	cmake \
+	  ${OECMAKE_GENERATOR_ARGS} \
 	  $oecmake_sitefile \
 	  ${OECMAKE_SOURCEPATH} \
-	  -DCMAKE_MAKE_PROGRAM=${MAKE} \
 	  -DCMAKE_INSTALL_PREFIX:PATH=${prefix} \
 	  -DCMAKE_INSTALL_BINDIR:PATH=${@os.path.relpath(d.getVar('bindir'), d.getVar('prefix'))} \
 	  -DCMAKE_INSTALL_SBINDIR:PATH=${@os.path.relpath(d.getVar('sbindir'), d.getVar('prefix'))} \
@@ -142,7 +159,6 @@ cmake_do_configure() {
 	  -Wno-dev
 }
 
-do_compile[progress] = "percent"
 cmake_do_compile()  {
 	bbnote VERBOSE=1 cmake --build '${B}' --target ${OECMAKE_TARGET_COMPILE} -- ${EXTRA_OECMAKE_BUILD}
 	VERBOSE=1 cmake --build '${B}' --target ${OECMAKE_TARGET_COMPILE} -- ${EXTRA_OECMAKE_BUILD}
-- 
2.11.0