From 67f60958b61941264b0e2a63ad527dd346a6b1e3 Mon Sep 17 00:00:00 2001
From: Gregor Jasny <gjasny@googlemail.com>
Date: Sat, 15 Aug 2015 21:01:31 +0200
Subject: Darwin: Add support for tbd library stub files

Starting with Xcode 7 the OSX and iOS SDKs contain only stub
files for dynamic system libraries. These stub files contain
some meta data and a list of exported sysbols in plain text.

They are handled by the toolchain like regular dylibs.
---
 Modules/Platform/Darwin.cmake                       |  2 +-
 Tests/RunCMake/XcodeProject/RunCMakeTest.cmake      |  6 ++++++
 Tests/RunCMake/XcodeProject/XcodeTbdStub-stdout.txt |  1 +
 Tests/RunCMake/XcodeProject/XcodeTbdStub.cmake      |  2 ++
 Tests/RunCMake/XcodeProject/osx.cmake               | 18 ++++++++++++++++++
 5 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 Tests/RunCMake/XcodeProject/XcodeTbdStub-stdout.txt
 create mode 100644 Tests/RunCMake/XcodeProject/XcodeTbdStub.cmake
 create mode 100644 Tests/RunCMake/XcodeProject/osx.cmake

diff --git a/Modules/Platform/Darwin.cmake b/Modules/Platform/Darwin.cmake
index 4e4810a..bb085ac 100644
--- a/Modules/Platform/Darwin.cmake
+++ b/Modules/Platform/Darwin.cmake
@@ -53,7 +53,7 @@ set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-dynamiclib -Wl,-headerpad_max_install_
 set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS "-bundle -Wl,-headerpad_max_install_names")
 set(CMAKE_SHARED_MODULE_LOADER_C_FLAG "-Wl,-bundle_loader,")
 set(CMAKE_SHARED_MODULE_LOADER_CXX_FLAG "-Wl,-bundle_loader,")
-set(CMAKE_FIND_LIBRARY_SUFFIXES ".dylib" ".so" ".a")
+set(CMAKE_FIND_LIBRARY_SUFFIXES ".tbd" ".dylib" ".so" ".a")
 
 # hack: if a new cmake (which uses CMAKE_INSTALL_NAME_TOOL) runs on an old build tree
 # (where install_name_tool was hardcoded) and where CMAKE_INSTALL_NAME_TOOL isn't in the cache
diff --git a/Tests/RunCMake/XcodeProject/RunCMakeTest.cmake b/Tests/RunCMake/XcodeProject/RunCMakeTest.cmake
index ef81739..1151abf 100644
--- a/Tests/RunCMake/XcodeProject/RunCMakeTest.cmake
+++ b/Tests/RunCMake/XcodeProject/RunCMakeTest.cmake
@@ -39,3 +39,9 @@ if(NOT XCODE_VERSION VERSION_LESS 5)
   unset(RunCMake_TEST_NO_CLEAN)
   unset(RunCMake_TEST_OPTIONS)
 endif()
+
+if(NOT XCODE_VERSION VERSION_LESS 7)
+  set(RunCMake_TEST_OPTIONS "-DCMAKE_TOOLCHAIN_FILE=${RunCMake_SOURCE_DIR}/osx.cmake")
+  run_cmake(XcodeTbdStub)
+  unset(RunCMake_TEST_OPTIONS)
+endif()
diff --git a/Tests/RunCMake/XcodeProject/XcodeTbdStub-stdout.txt b/Tests/RunCMake/XcodeProject/XcodeTbdStub-stdout.txt
new file mode 100644
index 0000000..9d9e143
--- /dev/null
+++ b/Tests/RunCMake/XcodeProject/XcodeTbdStub-stdout.txt
@@ -0,0 +1 @@
+.*/libz\.tbd.*
diff --git a/Tests/RunCMake/XcodeProject/XcodeTbdStub.cmake b/Tests/RunCMake/XcodeProject/XcodeTbdStub.cmake
new file mode 100644
index 0000000..e83d7f3
--- /dev/null
+++ b/Tests/RunCMake/XcodeProject/XcodeTbdStub.cmake
@@ -0,0 +1,2 @@
+cmake_minimum_required(VERSION 3.3)
+find_package(ZLIB REQUIRED)
diff --git a/Tests/RunCMake/XcodeProject/osx.cmake b/Tests/RunCMake/XcodeProject/osx.cmake
new file mode 100644
index 0000000..e021fcd
--- /dev/null
+++ b/Tests/RunCMake/XcodeProject/osx.cmake
@@ -0,0 +1,18 @@
+set(CMAKE_SYSTEM_NAME Darwin)
+set(CMAKE_SYSTEM_VERSION 1)
+set(UNIX True)
+set(APPLE True)
+
+find_program(XCRUN_EXECUTABLE xcrun)
+if(NOT XCRUN_EXECUTABLE)
+  message(FATAL_ERROR "xcrun not found")
+endif()
+
+execute_process(
+  COMMAND ${XCRUN_EXECUTABLE} --sdk macosx --show-sdk-path
+  OUTPUT_VARIABLE OSX_SDK_PATH
+  OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+set(CMAKE_OSX_SYSROOT ${OSX_SDK_PATH} CACHE PATH "Sysroot used for OSX support")
+
+set(CMAKE_FIND_ROOT_PATH ${OSX_SDK_PATH} CACHE PATH "Find search path root")
-- 
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