From a1221905092c09603c0b59dd0ed05bfe9f1f22ef Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 31 Mar 2017 11:26:08 -0400
Subject: Xcode: Detect CURRENT_ARCH for use by generator

During compiler identification, extract the Xcode `CURRENT_ARCH` value
and save it for later use by the Xcode generator in an internal compiler
information variable.  This will be useful to know the locations of
object files when only one architecture is built.
---
 Modules/CMakeCCompiler.cmake.in         | 1 +
 Modules/CMakeCXXCompiler.cmake.in       | 1 +
 Modules/CMakeDetermineCCompiler.cmake   | 5 +++++
 Modules/CMakeDetermineCXXCompiler.cmake | 5 +++++
 Modules/CMakeDetermineCompilerId.cmake  | 4 ++++
 Modules/CompilerId/Xcode-3.pbxproj.in   | 2 +-
 6 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/Modules/CMakeCCompiler.cmake.in b/Modules/CMakeCCompiler.cmake.in
index ab068a2..102ab69 100644
--- a/Modules/CMakeCCompiler.cmake.in
+++ b/Modules/CMakeCCompiler.cmake.in
@@ -13,6 +13,7 @@ set(CMAKE_C_PLATFORM_ID "@CMAKE_C_PLATFORM_ID@")
 set(CMAKE_C_SIMULATE_ID "@CMAKE_C_SIMULATE_ID@")
 set(CMAKE_C_SIMULATE_VERSION "@CMAKE_C_SIMULATE_VERSION@")
 @SET_MSVC_C_ARCHITECTURE_ID@
+@SET_CMAKE_XCODE_CURRENT_ARCH@
 set(CMAKE_AR "@CMAKE_AR@")
 set(CMAKE_GCC_AR "@CMAKE_GCC_AR@")
 set(CMAKE_RANLIB "@CMAKE_RANLIB@")
diff --git a/Modules/CMakeCXXCompiler.cmake.in b/Modules/CMakeCXXCompiler.cmake.in
index 27c8881..3dae035 100644
--- a/Modules/CMakeCXXCompiler.cmake.in
+++ b/Modules/CMakeCXXCompiler.cmake.in
@@ -14,6 +14,7 @@ set(CMAKE_CXX_PLATFORM_ID "@CMAKE_CXX_PLATFORM_ID@")
 set(CMAKE_CXX_SIMULATE_ID "@CMAKE_CXX_SIMULATE_ID@")
 set(CMAKE_CXX_SIMULATE_VERSION "@CMAKE_CXX_SIMULATE_VERSION@")
 @SET_MSVC_CXX_ARCHITECTURE_ID@
+@SET_CMAKE_XCODE_CURRENT_ARCH@
 set(CMAKE_AR "@CMAKE_AR@")
 set(CMAKE_GCC_AR "@CMAKE_GCC_AR@")
 set(CMAKE_RANLIB "@CMAKE_RANLIB@")
diff --git a/Modules/CMakeDetermineCCompiler.cmake b/Modules/CMakeDetermineCCompiler.cmake
index 5d9850d..3caccde 100644
--- a/Modules/CMakeDetermineCCompiler.cmake
+++ b/Modules/CMakeDetermineCCompiler.cmake
@@ -175,6 +175,11 @@ if(MSVC_C_ARCHITECTURE_ID)
     "set(MSVC_C_ARCHITECTURE_ID ${MSVC_C_ARCHITECTURE_ID})")
 endif()
 
+if(CMAKE_C_XCODE_CURRENT_ARCH)
+  set(SET_CMAKE_XCODE_CURRENT_ARCH
+    "set(CMAKE_XCODE_CURRENT_ARCH ${CMAKE_C_XCODE_CURRENT_ARCH})")
+endif()
+
 # configure variables set in this file for fast reload later on
 configure_file(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
   ${CMAKE_PLATFORM_INFO_DIR}/CMakeCCompiler.cmake
diff --git a/Modules/CMakeDetermineCXXCompiler.cmake b/Modules/CMakeDetermineCXXCompiler.cmake
index 4d85150..9150962 100644
--- a/Modules/CMakeDetermineCXXCompiler.cmake
+++ b/Modules/CMakeDetermineCXXCompiler.cmake
@@ -170,6 +170,11 @@ if(MSVC_CXX_ARCHITECTURE_ID)
     "set(MSVC_CXX_ARCHITECTURE_ID ${MSVC_CXX_ARCHITECTURE_ID})")
 endif()
 
+if(CMAKE_CXX_XCODE_CURRENT_ARCH)
+  set(SET_CMAKE_XCODE_CURRENT_ARCH
+    "set(CMAKE_XCODE_CURRENT_ARCH ${CMAKE_CXX_XCODE_CURRENT_ARCH})")
+endif()
+
 # configure all variables set in this file
 configure_file(${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
   ${CMAKE_PLATFORM_INFO_DIR}/CMakeCXXCompiler.cmake
diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index 1abbc01..687263a 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -104,6 +104,7 @@ function(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
   set(CMAKE_${lang}_PLATFORM_ID "${CMAKE_${lang}_PLATFORM_ID}" PARENT_SCOPE)
   set(MSVC_${lang}_ARCHITECTURE_ID "${MSVC_${lang}_ARCHITECTURE_ID}"
     PARENT_SCOPE)
+  set(CMAKE_${lang}_XCODE_CURRENT_ARCH "${CMAKE_${lang}_XCODE_CURRENT_ARCH}" PARENT_SCOPE)
   set(CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX "${CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX}" PARENT_SCOPE)
   set(CMAKE_${lang}_COMPILER_VERSION "${CMAKE_${lang}_COMPILER_VERSION}" PARENT_SCOPE)
   set(CMAKE_${lang}_COMPILER_WRAPPER "${CMAKE_${lang}_COMPILER_WRAPPER}" PARENT_SCOPE)
@@ -358,6 +359,9 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
         endif()
       endif()
     endif()
+    if("${CMAKE_${lang}_COMPILER_ID_OUTPUT}" MATCHES "CURRENT_ARCH=([^%\r\n]+)[\r\n]")
+      set(CMAKE_${lang}_XCODE_CURRENT_ARCH "${CMAKE_MATCH_1}" PARENT_SCOPE)
+    endif()
   else()
     execute_process(
       COMMAND "${CMAKE_${lang}_COMPILER}"
diff --git a/Modules/CompilerId/Xcode-3.pbxproj.in b/Modules/CompilerId/Xcode-3.pbxproj.in
index 22ad4f6..84f48ae 100644
--- a/Modules/CompilerId/Xcode-3.pbxproj.in
+++ b/Modules/CompilerId/Xcode-3.pbxproj.in
@@ -58,7 +58,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "echo \"GCC_VERSION=$GCC_VERSION\"";
+			shellScript = "echo \"GCC_VERSION=$GCC_VERSION\" ; echo \"CURRENT_ARCH=$CURRENT_ARCH\"";
 			showEnvVarsInLog = 0;
 		};
 		2C18F0B515DC1DCE00593670 = {
-- 
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