From e05835c35b5d31f31e1a55baf415c075b24a27ad Mon Sep 17 00:00:00 2001
From: Ruslan Baratov <ruslan_baratov@yahoo.com>
Date: Thu, 30 Mar 2017 10:57:01 +0800
Subject: CheckIPOSupported: Visual Studio and Xcode generators do not support
 IPO

---
 Modules/CheckIPOSupported.cmake                                    | 7 ++++++-
 Tests/RunCMake/CheckIPOSupported/RunCMakeTest.cmake                | 4 ++++
 .../CheckIPOSupported/not-supported-by-compiler-stderr.txt         | 2 +-
 .../CheckIPOSupported/not-supported-by-generator-result.txt        | 1 +
 .../CheckIPOSupported/not-supported-by-generator-stderr.txt        | 6 ++++++
 Tests/RunCMake/CheckIPOSupported/not-supported-by-generator.cmake  | 6 ++++++
 6 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 Tests/RunCMake/CheckIPOSupported/not-supported-by-generator-result.txt
 create mode 100644 Tests/RunCMake/CheckIPOSupported/not-supported-by-generator-stderr.txt
 create mode 100644 Tests/RunCMake/CheckIPOSupported/not-supported-by-generator.cmake

diff --git a/Modules/CheckIPOSupported.cmake b/Modules/CheckIPOSupported.cmake
index 6f7bc82..55c8901 100644
--- a/Modules/CheckIPOSupported.cmake
+++ b/Modules/CheckIPOSupported.cmake
@@ -203,7 +203,12 @@ function(check_ipo_supported)
   endif()
 
   if(NOT _CMAKE_IPO_MAY_BE_SUPPORTED_BY_COMPILER)
-    _ipo_not_supported("compiler doesn't support IPO")
+    _ipo_not_supported("Compiler doesn't support IPO")
+    return()
+  endif()
+
+  if(CMAKE_GENERATOR MATCHES "^(Visual Studio |Xcode$)")
+    _ipo_not_supported("CMake doesn't support IPO for current generator")
     return()
   endif()
 
diff --git a/Tests/RunCMake/CheckIPOSupported/RunCMakeTest.cmake b/Tests/RunCMake/CheckIPOSupported/RunCMakeTest.cmake
index e304c61..2815037 100644
--- a/Tests/RunCMake/CheckIPOSupported/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CheckIPOSupported/RunCMakeTest.cmake
@@ -7,3 +7,7 @@ run_cmake(default-lang-none)
 run_cmake(not-supported-by-cmake)
 run_cmake(not-supported-by-compiler)
 run_cmake(save-to-result)
+
+if(RunCMake_GENERATOR MATCHES "^(Visual Studio |Xcode$)")
+  run_cmake(not-supported-by-generator)
+endif()
diff --git a/Tests/RunCMake/CheckIPOSupported/not-supported-by-compiler-stderr.txt b/Tests/RunCMake/CheckIPOSupported/not-supported-by-compiler-stderr.txt
index 73e2f26..5f5f410 100644
--- a/Tests/RunCMake/CheckIPOSupported/not-supported-by-compiler-stderr.txt
+++ b/Tests/RunCMake/CheckIPOSupported/not-supported-by-compiler-stderr.txt
@@ -1,5 +1,5 @@
 ^CMake Error at .*/Modules/CheckIPOSupported\.cmake:[0-9]+ \(message\):
-  IPO is not supported \(compiler doesn't support IPO\)\.
+  IPO is not supported \(Compiler doesn't support IPO\)\.
 Call Stack \(most recent call first\):
   .*/Modules/CheckIPOSupported\.cmake:[0-9]+ \(_ipo_not_supported\)
   not-supported-by-compiler\.cmake:[0-9]+ \(check_ipo_supported\)
diff --git a/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator-result.txt b/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator-result.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator-stderr.txt b/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator-stderr.txt
new file mode 100644
index 0000000..a2aa58c
--- /dev/null
+++ b/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator-stderr.txt
@@ -0,0 +1,6 @@
+^CMake Error at .*/Modules/CheckIPOSupported\.cmake:[0-9]+ \(message\):
+  IPO is not supported \(CMake doesn't support IPO for current generator\)\.
+Call Stack \(most recent call first\):
+  .*/Modules/CheckIPOSupported\.cmake:[0-9]+ \(_ipo_not_supported\)
+  not-supported-by-generator\.cmake:[0-9]+ \(check_ipo_supported\)
+  CMakeLists\.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator.cmake b/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator.cmake
new file mode 100644
index 0000000..dc0fa09
--- /dev/null
+++ b/Tests/RunCMake/CheckIPOSupported/not-supported-by-generator.cmake
@@ -0,0 +1,6 @@
+project(${RunCMake_TEST} LANGUAGES C)
+
+set(_CMAKE_IPO_SUPPORTED_BY_CMAKE YES)
+set(_CMAKE_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
+
+check_ipo_supported()
-- 
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