Xcode: Detect the compiler id and tool location

Configure a hand-generated Xcode project to build the compiler id source
file since we cannot run the compiler command-line tool directly.  Add a
post-build shell script phase to print out the compiler toolset build
setting.  Run xcodebuild to compile the identification binary.  Parse
the full path to the compiler tool from the xcodebuild output.

Modules/CMakeDetermineCCompiler.cmake

@@ -44,6 +44,8 @@ if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
   set(CMAKE_C_PLATFORM_ID "Windows")
   set(CMAKE_C_COMPILER_ID "MSVC")
   set(CMAKE_C_COMPILER "${CMAKE_GENERATOR_CC}")
+elseif("${CMAKE_GENERATOR}" MATCHES "Xcode")
+  set(CMAKE_C_COMPILER_XCODE_TYPE sourcecode.c.c)
 else()
   if(NOT CMAKE_C_COMPILER)
     set(CMAKE_C_COMPILER_INIT NOTFOUND)

Modules/CMakeDetermineCXXCompiler.cmake

@@ -43,6 +43,8 @@ if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
   set(CMAKE_CXX_PLATFORM_ID "Windows")
   set(CMAKE_CXX_COMPILER_ID "MSVC")
   set(CMAKE_CXX_COMPILER "${CMAKE_GENERATOR_CXX}")
+elseif("${CMAKE_GENERATOR}" MATCHES "Xcode")
+  set(CMAKE_CXX_COMPILER_XCODE_TYPE sourcecode.cpp.cpp)
 else()
   if(NOT CMAKE_CXX_COMPILER)
     set(CMAKE_CXX_COMPILER_INIT NOTFOUND)

Modules/CMakeDetermineCompilerId.cmake

@@ -107,7 +107,41 @@ Id flags: ${testflags}
 ")
 
   # Compile the compiler identification source.
-  if(0)
+  if("${CMAKE_GENERATOR}" MATCHES "Xcode")
+    set(id_lang "${lang}")
+    set(id_type ${CMAKE_${lang}_COMPILER_XCODE_TYPE})
+    set(id_dir ${CMAKE_${lang}_COMPILER_ID_DIR})
+    get_filename_component(id_src "${src}" NAME)
+    if(NOT ${XCODE_VERSION} VERSION_LESS 3)
+      set(v 3)
+      set(ext xcodeproj)
+    elseif(NOT ${XCODE_VERSION} VERSION_LESS 2)
+      set(v 2)
+      set(ext xcodeproj)
+    else()
+      set(v 1)
+      set(ext xcode)
+    endif()
+    configure_file(${CMAKE_ROOT}/Modules/CompilerId/Xcode-${v}.pbxproj.in
+      ${id_dir}/CompilerId${lang}.${ext}/project.pbxproj @ONLY IMMEDIATE)
+    execute_process(COMMAND xcodebuild
+      WORKING_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR}
+      OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
+      ERROR_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
+      RESULT_VARIABLE CMAKE_${lang}_COMPILER_ID_RESULT
+      )
+
+    # Match the link line from xcodebuild output of the form
+    #  Ld ...
+    #      ...
+    #      /path/to/cc ...CompilerId${lang}/...
+    # to extract the compiler front-end for the language.
+    if("${CMAKE_${lang}_COMPILER_ID_OUTPUT}" MATCHES "\nLd[^\n]*(\n[ \t]+[^\n]*)*\n[ \t]+([^ \t\r\n]+)[^\r\n]*-o[^\r\n]*CompilerId${lang}/\\./CompilerId${lang}[ \t\n\\\"]")
+      set(_comp "${CMAKE_MATCH_2}")
+      if(EXISTS "${_comp}")
+        set(CMAKE_${lang}_COMPILER_ID_TOOL "${_comp}" PARENT_SCOPE)
+      endif()
+    endif()
   else()
     if(COMMAND EXECUTE_PROCESS)
       execute_process(

Modules/CMakeDetermineFortranCompiler.cmake

@@ -30,6 +30,8 @@ if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
   set(CMAKE_Fortran_PLATFORM_ID "Windows")
   set(CMAKE_Fortran_COMPILER_ID "Intel")
   set(CMAKE_Fortran_COMPILER "${CMAKE_GENERATOR_FC}")
+elseif("${CMAKE_GENERATOR}" MATCHES "Xcode")
+  set(CMAKE_Fortran_COMPILER_XCODE_TYPE sourcecode.fortran.f90)
 else()
   if(NOT CMAKE_Fortran_COMPILER)
     # prefer the environment variable CC

Modules/CompilerId/Xcode-1.pbxproj.in

@@ -0,0 +1,120 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 39;
+	objects = {
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+			buildSettings = {
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+			isa = PBXBuildStyle;
+			name = Development;
+		};
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+			buildStyles = (
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+			hasScannedForEncodings = 1;
+			isa = PBXProject;
+			mainGroup = 08FB7794FE84155DC02AAC07;
+			projectDirPath = "";
+			targets = (
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+			);
+		};
+		08FB7794FE84155DC02AAC07 = {
+			children = (
+				08FB7795FE84155DC02AAC07,
+				1AB674ADFE9D54B511CA2CBB,
+			);
+			isa = PBXGroup;
+			name = CompilerId@id_lang@;
+			refType = 4;
+			sourceTree = "<group>";
+		};
+		08FB7795FE84155DC02AAC07 = {
+			children = (
+				2C18F0B415DC1DC700593670,
+			);
+			isa = PBXGroup;
+			name = Source;
+			refType = 4;
+			sourceTree = "<group>";
+		};
+		1AB674ADFE9D54B511CA2CBB = {
+			children = (
+				8DD76F6C0486A84900D96B5E,
+			);
+			isa = PBXGroup;
+			name = Products;
+			refType = 4;
+			sourceTree = "<group>";
+		};
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+			fileEncoding = 30;
+			isa = PBXFileReference;
+			lastKnownFileType = @id_type@;
+			path = @id_src@;
+			refType = 4;
+			sourceTree = "<group>";
+		};
+		2C18F0B615DC1E0300593670 = {
+			fileRef = 2C18F0B415DC1DC700593670;
+			isa = PBXBuildFile;
+			settings = {
+			};
+		};
+		2C8FEB8E15DC1A1A00E56A5D = {
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+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
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+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "echo \"GCC_VERSION=$GCC_VERSION\"";
+		};
+		8DD76FA90486AB0100D96B5E = {
+			buildPhases = (
+				2C18F0B515DC1DCE00593670,
+				2C8FEB8E15DC1A1A00E56A5D,
+			);
+			buildRules = (
+			);
+			buildSettings = {
+				PRODUCT_NAME = CompilerId@id_lang@;
+				SYMROOT = .;
+			};
+			dependencies = (
+			);
+			isa = PBXNativeTarget;
+			name = CompilerId@id_lang@;
+			productName = CompilerId@id_lang@;
+			productReference = 8DD76F6C0486A84900D96B5E;
+			productType = "com.apple.product-type.tool";
+		};
+		2C18F0B515DC1DCE00593670 = {
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+			files = (
+				2C18F0B615DC1E0300593670,
+			);
+			isa = PBXSourcesBuildPhase;
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		8DD76F6C0486A84900D96B5E = {
+			explicitFileType = "compiled.mach-o.executable";
+			includeInIndex = 0;
+			isa = PBXFileReference;
+			path = CompilerId@id_lang@;
+			refType = 3;
+			sourceTree = BUILT_PRODUCTS_DIR;
+		};
+	};
+	rootObject = 08FB7793FE84155DC02AAC07;
+}

Modules/CompilerId/Xcode-2.pbxproj.in

@@ -0,0 +1,119 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 42;
+	objects = {
+
+		2C18F0B615DC1E0300593670 = {isa = PBXBuildFile; fileRef = 2C18F0B415DC1DC700593670; };
+		2C18F0B415DC1DC700593670 = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = @id_type@; path = @id_src@; sourceTree = "<group>"; };
+		8DD76F6C0486A84900D96B5E = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = CompilerId@id_lang@; sourceTree = BUILT_PRODUCTS_DIR; };
+
+		08FB7794FE84155DC02AAC07 = {
+			isa = PBXGroup;
+			children = (
+				08FB7795FE84155DC02AAC07,
+				1AB674ADFE9D54B511CA2CBB,
+			);
+			name = CompilerId@id_lang@;
+			sourceTree = "<group>";
+		};
+		08FB7795FE84155DC02AAC07 = {
+			isa = PBXGroup;
+			children = (
+				2C18F0B415DC1DC700593670,
+			);
+			name = Source;
+			sourceTree = "<group>";
+		};
+		1AB674ADFE9D54B511CA2CBB = {
+			isa = PBXGroup;
+			children = (
+				8DD76F6C0486A84900D96B5E,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+
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+				2C8FEB8E15DC1A1A00E56A5D,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = CompilerId@id_lang@;
+			productName = CompilerId@id_lang@;
+			productReference = 8DD76F6C0486A84900D96B5E;
+			productType = "com.apple.product-type.tool";
+		};
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+			buildConfigurationList = 1DEB928908733DD80010E9CD;
+			hasScannedForEncodings = 1;
+			mainGroup = 08FB7794FE84155DC02AAC07;
+			projectDirPath = "";
+			targets = (
+				8DD76FA90486AB0100D96B5E,
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+			inputPaths = (
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+			outputPaths = (
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+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "echo \"GCC_VERSION=$GCC_VERSION\"";
+		};
+		2C18F0B515DC1DCE00593670 = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				2C18F0B615DC1E0300593670,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		1DEB928608733DD80010E9CD = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				PRODUCT_NAME = CompilerId@id_lang@;
+			};
+			name = Debug;
+		};
+		1DEB928A08733DD80010E9CD = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CONFIGURATION_BUILD_DIR = "$(BUILD_DIR)";
+				SYMROOT = .;
+			};
+			name = Debug;
+		};
+		1DEB928508733DD80010E9CD = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				1DEB928608733DD80010E9CD,
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+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Debug;
+		};
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+			buildConfigurations = (
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+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Debug;
+		};
+	};
+	rootObject = 08FB7793FE84155DC02AAC07;
+}

Modules/CompilerId/Xcode-3.pbxproj.in

@@ -0,0 +1,107 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 45;
+	objects = {
+
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+		2C18F0B415DC1DC700593670 = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = @id_type@; path = @id_src@; sourceTree = "<group>"; };
+		08FB7794FE84155DC02AAC07 = {
+			isa = PBXGroup;
+			children = (
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+			);
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+			sourceTree = "<group>";
+		};
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+		};
+		08FB7793FE84155DC02AAC07 = {
+			isa = PBXProject;
+			buildConfigurationList = 1DEB928908733DD80010E9CD;
+			compatibilityVersion = "Xcode 3.1";
+			developmentRegion = English;
+			hasScannedForEncodings = 1;
+			knownRegions = (
+				en,
+			);
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+			projectRoot = "";
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+			shellScript = "echo \"GCC_VERSION=$GCC_VERSION\"";
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+			buildSettings = {
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+			};
+			name = Debug;
+		};
+		1DEB928A08733DD80010E9CD = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ARCHS = "$(ARCHS_STANDARD_32_BIT)";
+				ONLY_ACTIVE_ARCH = YES;
+				CONFIGURATION_BUILD_DIR = "$(BUILD_DIR)";
+				SYMROOT = .;
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+			name = Debug;
+		};
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+			defaultConfigurationName = Debug;
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+	};
+	rootObject = 08FB7793FE84155DC02AAC07;
+}