[oe] [PATCH] cmake: respect ${S} and ${B}

[Ross Burton]

Instead of the class-specific variables OECMAKE_BUILDPATH and
OECMAKE_SOURCEPATH, just use ${B} and ${S}.

If these two paths are different, delete any existing ${B} before running a
build so that previous builds don't taint the current build.

Note that OECMAKE_SOURCEPATH and OECMAKE_BUILDPATH are not respected at all, so
recipes that manually set these in the past will need to be updated to either
use something along the lines of separatebuilddir.inc or set B themselves.

Signed-off-by: Ross Burton <ross.burton at intel.com>
---
 meta/classes/cmake.bbclass |   31 +++++++------------------------
 1 file changed, 7 insertions(+), 24 deletions(-)

diff --git a/meta/classes/cmake.bbclass b/meta/classes/cmake.bbclass
index 30c1792..4d1489a 100644
--- a/meta/classes/cmake.bbclass
+++ b/meta/classes/cmake.bbclass
@@ -6,15 +6,6 @@ CCACHE = ""
 # We want the staging and installing functions from autotools
 inherit autotools
 
-# Use in-tree builds by default but allow this to be changed
-# since some packages do not support them (e.g. llvm 2.5).
-OECMAKE_SOURCEPATH ?= "."
-
-# If declaring this, make sure you also set EXTRA_OEMAKE to
-# "-C ${OECMAKE_BUILDPATH}". So it will run the right makefiles.
-OECMAKE_BUILDPATH ?= ""
-B="${S}"
-
 # C/C++ Compiler (without cpu arch/tune arguments)
 OECMAKE_C_COMPILER ?= "`echo ${CC} | sed 's/^\([^ ]*\).*/\1/'`"
 OECMAKE_CXX_COMPILER ?= "`echo ${CXX} | sed 's/^\([^ ]*\).*/\1/'`"
@@ -73,10 +64,10 @@ EOF
 addtask generate_toolchain_file after do_patch before do_configure
 
 cmake_do_configure() {
-	if [ ${OECMAKE_BUILDPATH} ]
-	then
-		mkdir -p ${OECMAKE_BUILDPATH}
-		cd ${OECMAKE_BUILDPATH}
+	if [ "${S}" != "${B}" ]; then
+		rm -rf ${B}
+		mkdir -p ${B}
+		cd ${B}
 	fi
 
 	# Just like autotools cmake can use a site file to cache result that need generated binaries to run
@@ -88,7 +79,7 @@ cmake_do_configure() {
 
 	cmake \
 	  ${OECMAKE_SITEFILE} \
-	  ${OECMAKE_SOURCEPATH} \
+	  ${S} \
 	  -DCMAKE_INSTALL_PREFIX:PATH=${prefix} \
 	  -DCMAKE_INSTALL_SO_NO_EXE=0 \
 	  -DCMAKE_TOOLCHAIN_FILE=${WORKDIR}/toolchain.cmake \
@@ -98,20 +89,12 @@ cmake_do_configure() {
 }
 
 cmake_do_compile()  {
-	if [ ${OECMAKE_BUILDPATH} ]
-	then
-		cd ${OECMAKE_BUILDPATH}
-	fi
-
+	cd ${B}
 	base_do_compile
 }
 
 cmake_do_install() {
-	if [ ${OECMAKE_BUILDPATH} ];
-	then
-		cd ${OECMAKE_BUILDPATH}
-	fi
-
+	cd ${B}
 	autotools_do_install
 }
 
-- 
1.7.10.4