qttools: Add CONFIG+=config_clang_done when not building with clang

This ensures that dev packages from clang are not looked into during
configure

Define YOCTO_ALTERNATE_EXE_PATH pointing into target sysroot so that
llvm-config can find the target libclang instead of native one

Fixes
linking ../../bin/qdoc
TMPDIR/work/cortexa7t2hf-neon-vfpv4-yoe-linux-gnueabi/qttools/5.13.0+gitAUTOINC+cc9250477e-r0/recipe-sysroot-native/usr/lib/libclang.so: file not recognized: file format not recognized
clang-9: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [Makefile:212: ../../bin/qdoc] Error 1

Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/recipes-qt/qt5/qttools_git.bb b/recipes-qt/qt5/qttools_git.bb
index e9530385..ba0957ac 100644
--- a/recipes-qt/qt5/qttools_git.bb
+++ b/recipes-qt/qt5/qttools_git.bb
@@ -30,13 +30,15 @@ PACKAGECONFIG_append_toolchain-clang = " clang"
 PACKAGECONFIG[qtwebkit] = ",,qtwebkit"
 PACKAGECONFIG[clang] = ",,clang"
 
+export YOCTO_ALTERNATE_EXE_PATH = "${STAGING_BINDIR}/llvm-config"
+
 EXTRA_QMAKEVARS_PRE += " \
     ${@bb.utils.contains('PACKAGECONFIG', 'qtwebkit', '', 'CONFIG+=noqtwebkit', d)} \
 "
-EXTRA_QMAKEVARS_PRE_append_class-native = " CONFIG-=config_clang"
-EXTRA_QMAKEVARS_PRE_append_class-nativesdk = " CONFIG-=config_clang"
+EXTRA_QMAKEVARS_PRE_append_class-native = " CONFIG+=config_clang_done CONFIG-=config_clang"
+EXTRA_QMAKEVARS_PRE_append_class-nativesdk = " CONFIG+=config_clang_done CONFIG-=config_clang"
 EXTRA_QMAKEVARS_PRE_append_class-target = "\
-    ${@bb.utils.contains('PACKAGECONFIG', 'clang', 'CONFIG+=config_clang', 'CONFIG-=config_clang', d)} \
+    ${@bb.utils.contains('PACKAGECONFIG', 'clang', 'CONFIG+=config_clang', 'CONFIG+=config_clang_done CONFIG-=config_clang', d)} \
 "
 
 SRCREV = "cc9250477eaa71a3f3ffd050591d4a9d835288ca"