[OE-core] [meson][PATCH] meson: Allow for llvm-native tools to be used

[fdk17]

I created a bbappend to build the LLVM recipe so that all the libraries were available for use on the host.
These libraries are then used by a host/sdk tool to prepare binary files for use by an application on the target.
When building our tool using meson it wasn't able to find the Yocto built LLLVM libraries.
This fixes the issue so meson uses the correct llvm-config tool.

Author: Fred Baksik <fred.baksik at mrcy.com>
Date: Tue Dec 24 20:38:47 2019 -0500

 meson: Allow for llvm-native tools to be used

 Signed-off-by: Fred Baksik <fred.baksik at mrcy.com>

diff --git a/meta/classes/meson.bbclass b/meta/classes/meson.bbclass
index e1a13bbbf7..b5cd2ee8c4 100644
--- a/meta/classes/meson.bbclass
+++ b/meta/classes/meson.bbclass
@@ -33,6 +33,7 @@ EXTRA_OEMESON_append = " ${PACKAGECONFIG_CONFARGS}"
 MESON_CROSS_FILE = ""
 MESON_CROSS_FILE_class-target = "--cross-file ${WORKDIR}/meson.cross"
 MESON_CROSS_FILE_class-nativesdk = "--cross-file ${WORKDIR}/meson.cross"
+MESON_CROSS_FILE_class-native = "--native-file ${WORKDIR}/meson.native"

 def meson_array(var, d):
 items = d.getVar(var).split()
@@ -110,6 +111,14 @@ endian = '${@meson_endian('TARGET', d)}'
 EOF
 }

+do_write_config_class-native() {
+ # This needs to be Py to split the args into single-element lists
+ cat >${WORKDIR}/meson.native <<EOF
+[binaries]
+llvm-config = 'llvm-config${LLVMVERSION}'
+EOF
+}
+
 CONFIGURE_FILES = "meson.build"

 meson_do_configure() {
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