ispc: fix recipe

There are few problems in current recipe:

(1)
ispc needs to invoke native llvm-config from target sysroot to list LLVM
lib libraries. clang already provides crossscripts/llvm-config, which does
the job.

However, using LLVM_TOOLS_BINARY_DIR leads to wrong llvm-config being
used. So remove it from search path for llvm-config.

(2)
Error:
ispc/1.17.0-r0/recipe-sysroot-native/usr/bin/x86_64-poky-linux/x86_64-poky-linux-ld:
ispc/1.17.0-r0/recipe-sysroot-native/usr/lib/libclang-cpp.so: undefined reference to `std::condition_variable::wait(std::unique_lock<std::mutex>&)@GLIBCXX_3.4.30'
error: linker command failed with exit code 1 (use -v to see invocation)

Native libraries were being linked to target libraries leading to this
failure. Fix and cleanup DEPENDS/RDEPENDS.

Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>

dynamic-layers/clang-layer/recipes-core/ispc/ispc/0001-CMakeLists.txt-allow-to-pick-llvm-config-from-usr-bi.patch

@@ -0,0 +1,37 @@
+From 51d248d3b470f3fa1cf2ed3f5742851091acb65f Mon Sep 17 00:00:00 2001
+From: Naveen Saini <naveen.kumar.saini@intel.com>
+Date: Fri, 12 May 2023 09:10:11 +0800
+Subject: [PATCH] CMakeLists.txt: allow to pick llvm-config from
+ usr/bin/crossscripts/
+
+ispc needs to invoke native llvm-config from target sysroot to list LLVM
+lib libraries. clang already provides crossscripts/llvm-config, which does
+the job.
+
+However, using LLVM_TOOLS_BINARY_DIR leads to wrong llvm-config being
+used. So remove it from search path for llvm-config.
+
+Upstream-Status: Inappropriate
+
+Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
+---
+ cmake/FindLLVM.cmake | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/cmake/FindLLVM.cmake b/cmake/FindLLVM.cmake
+index d0297d5d..90d9fed2 100644
+--- a/cmake/FindLLVM.cmake
++++ b/cmake/FindLLVM.cmake
+@@ -41,8 +41,7 @@ find_package(LLVM REQUIRED CONFIG)
+     set(LLVM_VERSION "LLVM_${LLVM_VERSION_MAJOR}_${LLVM_VERSION_MINOR}")
+     message(STATUS "Found LLVM ${LLVM_VERSION}")
+ 
+-find_program(LLVM_CONFIG_EXECUTABLE NAMES llvm-config
+-    PATHS ${LLVM_TOOLS_BINARY_DIR} PATH_SUFFIXES bin NO_DEFAULT_PATH)
++find_program(LLVM_CONFIG_EXECUTABLE NAMES llvm-config)
+     if (NOT LLVM_CONFIG_EXECUTABLE)
+         message(FATAL_ERROR "Failed to find llvm-config")
+     endif()
+-- 
+2.37.3
+

dynamic-layers/clang-layer/recipes-core/ispc/ispc_1.17.0.bb

@@ -15,13 +15,14 @@ SRC_URI = "git://github.com/ispc/ispc.git;protocol=https;branch=main \
            file://0001-CMakeLists.txt-link-with-libclang-cpp-library-instea.patch \
            file://0002-cmake-don-t-build-for-32-bit-targets.patch \
            file://0001-Enable-LLVM-15.0-support.patch \
+           file://0001-CMakeLists.txt-allow-to-pick-llvm-config-from-usr-bi.patch \
            "
 SRCREV = "7ad8429369a4d5ced6b524fdfffe623939d8fe9a"
 
 COMPATIBLE_HOST = '(x86_64).*-linux'
 
 DEPENDS += " clang-native bison-native "
-RDEPENDS:${PN} += " clang-libllvm clang"
+DEPENDS:append:class-target = " clang"
 
 EXTRA_OECMAKE += " \
                   -DISPC_INCLUDE_TESTS=OFF  \
@@ -34,7 +35,11 @@ EXTRA_OECMAKE += " \
                   -DISPC_WINDOWS_TARGET=OFF  \
                   -DISPC_IOS_TARGET=OFF  \
                   -DISPC_PS4_TARGET=OFF  \
-                  -DSYSROOT_DIR=${STAGING_DIR_NATIVE}  \
+                  -DSYSROOT_DIR=${STAGING_DIR} \
+                  -DCLANG_EXECUTABLE=${STAGING_BINDIR_NATIVE}/clang \
+                  -DCLANGPP_EXECUTABLE=${STAGING_BINDIR_NATIVE}/clang++ \
+                  -DLLVM_DIS_EXECUTABLE=${STAGING_BINDIR_NATIVE}/llvm-dis \
+                  -DLLVM_AS_EXECUTABLE=${STAGING_BINDIR_NATIVE}/llvm-as \
                   "
 
 TOOLCHAIN = "clang"