moltenvk: refactor to build without Xcode

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

- Use the 11.0 SDK instead of the 10.12 one on x86_64-darwin;
- Use `NIX_CFLAGS_COMPILE` and `NIX_LDFLAGS` to pass flags to the
  compiler instead of patching the Xcode project files; and
- Use xcbuild to build the project.

pkgs/os-specific/darwin/moltenvk/MoltenVK.xcodeproj.patch

@@ -86,61 +86,3 @@ index c23afce4..12ac12f4 100644
  /* Begin XCBuildConfiguration section */
  		2FEA0AB824902F9F00EEF3AD /* Debug */ = {
  			isa = XCBuildConfiguration;
-@@ -1586,11 +1544,12 @@
- 				GCC_WARN_UNUSED_VARIABLE = YES;
- 				GENERATE_MASTER_OBJECT_FILE = YES;
- 				HEADER_SEARCH_PATHS = (
--					"\"$(SRCROOT)/include\"",
--					"\"$(SRCROOT)/../MoltenVKShaderConverter\"",
--					"\"$(SRCROOT)/../MoltenVKShaderConverter/SPIRV-Cross\"",
--					"\"$(SRCROOT)/../External/cereal/include\"",
--					"\"${BUILT_PRODUCTS_DIR}\"",
-+					"@@sourceRoot@@/outputs/include",
-+					"@@sourceRoot@@/outputs/include/simd_workaround",
-+					"@@sourceRoot@@/MoltenVKShaderConverter",
-+					"@@cereal@@/include",
-+					"@@spirv-cross@@/include/spirv_cross",
-+					"@@vulkan-headers@@/include",
- 				);
- 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
- 				MACH_O_TYPE = staticlib;
-@@ -1600,6 +1559,10 @@
- 				MVK_SKIP_DYLIB = "";
- 				"MVK_SKIP_DYLIB[sdk=appletvsimulator*]" = YES;
- 				"MVK_SKIP_DYLIB[sdk=iphonesimulator*]" = YES;
-+				OTHER_CFLAGS = (
-+					"-isystem",
-+					"@@libcxx@@/include/c++/v1",
-+				);
- 				PRELINK_LIBS = "${CONFIGURATION_BUILD_DIR}/libMoltenVKShaderConverter.a";
- 				PRODUCT_NAME = MoltenVK;
- 				SKIP_INSTALL = YES;
-@@ -1658,11 +1621,12 @@
- 				GCC_WARN_UNUSED_VARIABLE = YES;
- 				GENERATE_MASTER_OBJECT_FILE = YES;
- 				HEADER_SEARCH_PATHS = (
--					"\"$(SRCROOT)/include\"",
--					"\"$(SRCROOT)/../MoltenVKShaderConverter\"",
--					"\"$(SRCROOT)/../MoltenVKShaderConverter/SPIRV-Cross\"",
--					"\"$(SRCROOT)/../External/cereal/include\"",
--					"\"${BUILT_PRODUCTS_DIR}\"",
-+					"@@sourceRoot@@/outputs/include",
-+					"@@sourceRoot@@/outputs/include/simd_workaround",
-+					"@@sourceRoot@@/MoltenVKShaderConverter",
-+					"@@cereal@@/include",
-+					"@@spirv-cross@@/include/spirv_cross",
-+					"@@vulkan-headers@@/include",
- 				);
- 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
- 				MACH_O_TYPE = staticlib;
-@@ -1672,6 +1636,10 @@
- 				MVK_SKIP_DYLIB = "";
- 				"MVK_SKIP_DYLIB[sdk=appletvsimulator*]" = YES;
- 				"MVK_SKIP_DYLIB[sdk=iphonesimulator*]" = YES;
-+				OTHER_CFLAGS = (
-+					"-isystem",
-+					"@@libcxx@@/include/c++/v1",
-+				);
- 				PRELINK_LIBS = "${CONFIGURATION_BUILD_DIR}/libMoltenVKShaderConverter.a";
- 				PRODUCT_NAME = MoltenVK;
- 				SKIP_INSTALL = YES;

pkgs/os-specific/darwin/moltenvk/MoltenVKShaderConverter.xcodeproj.patch

@@ -82,99 +82,3 @@ index c7842b63..d55f73ed 100644
  			productReference = A93903C71C57E9ED00FE90DC /* libMoltenVKShaderConverter.a */;
  			productType = "com.apple.product-type.library.static";
  		};
-@@ -536,6 +518,17 @@
- 				OTHER_LDFLAGS = (
- 					"-ObjC",
- 					"-w",
-+					"-lMachineIndependent",
-+					"-lGenericCodeGen",
-+					"-lOGLCompiler",
-+					"-lglslang",
-+					"-lOSDependent",
-+					"-lSPIRV",
-+					"-lSPIRV-Tools",
-+					"-lSPIRV-Tools-opt",
-+					"-lspirv-cross-msl",
-+					"-lspirv-cross-core",
-+					"-lspirv-cross-glsl",
- 				);
- 				SDKROOT = macosx;
- 			};
-@@ -548,6 +541,17 @@
- 				OTHER_LDFLAGS = (
- 					"-ObjC",
- 					"-w",
-+					"-lMachineIndependent",
-+					"-lGenericCodeGen",
-+					"-lOGLCompiler",
-+					"-lglslang",
-+					"-lOSDependent",
-+					"-lSPIRV",
-+					"-lSPIRV-Tools",
-+					"-lSPIRV-Tools-opt",
-+					"-lspirv-cross-msl",
-+					"-lspirv-cross-core",
-+					"-lspirv-cross-glsl",
- 				);
- 				SDKROOT = macosx;
- 			};
-@@ -624,15 +628,24 @@
- 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
- 				GCC_WARN_UNUSED_FUNCTION = YES;
- 				HEADER_SEARCH_PATHS = (
--					"$(inherited)",
--					"\"$(SRCROOT)\"",
--					"\"$(SRCROOT)/SPIRV-Cross\"",
--					"\"$(SRCROOT)/glslang\"",
--					"\"$(SRCROOT)/glslang/External/spirv-tools/include\"",
-+					"@@sourceRoot@@/Common",
-+					"@@glslang@@/include",
-+					"@@spirv-cross@@/include/spirv_cross",
-+					"@@spirv-tools@@/include",
-+					"@@spirv-headers@@/include/spirv/unified1/",
- 				);
- 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
-+				LIBRARY_SEARCH_PATHS = (
-+					"@@glslang@@/lib",
-+					"@@spirv-cross@@/lib",
-+					"@@spirv-tools@@/lib",
-+				);
- 				MACH_O_TYPE = staticlib;
- 				MACOSX_DEPLOYMENT_TARGET = 10.11;
-+				OTHER_CFLAGS = (
-+					"-isystem",
-+					"@@libcxx@@/include/c++/v1",
-+				);
- 				PRODUCT_NAME = MoltenVKShaderConverter;
- 				SKIP_INSTALL = YES;
- 				TVOS_DEPLOYMENT_TARGET = 9.0;
-@@ -683,15 +696,24 @@
- 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
- 				GCC_WARN_UNUSED_FUNCTION = YES;
- 				HEADER_SEARCH_PATHS = (
--					"$(inherited)",
--					"\"$(SRCROOT)\"",
--					"\"$(SRCROOT)/SPIRV-Cross\"",
--					"\"$(SRCROOT)/glslang\"",
--					"\"$(SRCROOT)/glslang/External/spirv-tools/include\"",
-+					"@@sourceRoot@@/Common",
-+					"@@glslang@@/include",
-+					"@@spirv-cross@@/include/spirv_cross",
-+					"@@spirv-tools@@/include",
-+					"@@spirv-headers@@/include/spirv/unified1/",
- 				);
- 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
-+				LIBRARY_SEARCH_PATHS = (
-+					"@@glslang@@/lib",
-+					"@@spirv-cross@@/lib",
-+					"@@spirv-tools@@/lib",
-+				);
- 				MACH_O_TYPE = staticlib;
- 				MACOSX_DEPLOYMENT_TARGET = 10.11;
-+				OTHER_CFLAGS = (
-+					"-isystem",
-+					"@@libcxx@@/include/c++/v1",
-+				);
- 				PRODUCT_NAME = MoltenVKShaderConverter;
- 				SKIP_INSTALL = YES;
- 				TVOS_DEPLOYMENT_TARGET = 9.0;