package/spirv-llvm-translator: add target variant to provide LLVMSPIRVLib

This target version is needed for Rusticl which is an LLVM based OpenCL
framework[1]. Rusticl allow programs to compile OpenCL C/C++ code
at runtime with Clang. Clang generates LLVM IR which is translated into
SPIR-V by spirv-llvm-translator. Finally, mesa can use its internal
tools to manage SPIR-V.

[1]: https://docs.mesa3d.org/rusticl.html

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Sebastian Weyer <sebastian.weyer@smile.fr>
Signed-off-by: Antoine Coutant <antoine.coutant@smile.fr>
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/Config.in

@@ -332,6 +332,7 @@ comment "Graphic applications"
 	source "package/pngquant/Config.in"
 	source "package/qt5cinex/Config.in"
 	source "package/rrdtool/Config.in"
+	source "package/spirv-llvm-translator/Config.in"
 	source "package/spirv-tools/Config.in"
 	source "package/stellarium/Config.in"
 	source "package/sway/Config.in"

package/spirv-llvm-translator/Config.in

@@ -0,0 +1,22 @@
+config BR2_PACKAGE_SPIRV_LLVM_TRANSLATOR
+	bool "spirv-translator"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on !BR2_STATIC_LIBS
+	depends on BR2_HOST_GCC_AT_LEAST_7 # host-llvm
+	select BR2_PACKAGE_LLVM
+	select BR2_PACKAGE_SPIRV_HEADERS
+	select BR2_PACKAGE_ZLIB
+	help
+	  LLVM/SPIR-V Bi-Directional Translator is a library and tool
+	  for translation between LLVM IR and SPIR-V.
+
+	  https://github.com/khronosGroup/SPIRV-LLVM-Translator
+
+comment "spirv-translator needs a toolchain w/ threads, C++, gcc >= 7, dynamic library, host gcc >= 7"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_7 \
+		|| BR2_STATIC_LIBS || !BR2_HOST_GCC_AT_LEAST_7

package/spirv-llvm-translator/spirv-llvm-translator.mk

@@ -19,4 +19,14 @@ HOST_SPIRV_LLVM_TRANSLATOR_CONF_OPTS = \
 	-DLLVM_EXTERNAL_PROJECTS="SPIRV-Headers" \
 	-DLLVM_EXTERNAL_SPIRV_HEADERS_SOURCE_DIR=$(HOST_DIR)/include
 
+SPIRV_LLVM_TRANSLATOR_INSTALL_STAGING = YES
+SPIRV_LLVM_TRANSLATOR_DEPENDENCIES = host-clang host-llvm llvm spirv-headers
+SPIRV_LLVM_TRANSLATOR_CONF_OPTS = \
+	-DLLVM_EXTERNAL_SPIRV_HEADERS_SOURCE_DIR=$(STAGING_DIR)/usr \
+	-DLLVM_BUILD_TOOLS=ON \
+	-DLLVM_DIR=$(STAGING_DIR)/lib/cmake/llvm \
+	-DLLVM_SPIRV_BUILD_EXTERNAL=YES \
+	-DLLVM_SPIRV_INCLUDE_TESTS=OFF
+
+$(eval $(cmake-package))
 $(eval $(host-cmake-package))