Merge topic 'clang-ipo-support'

dca9c33abc Tests: Remove old IPO test
c856d4556b bindexplib: supporting llvm bitcode formats using llvm-nm
079b8e2916 Clang: prefer lld-link over link.exe
6e3655db2c Clang: add LTO support for GNU-command line clang on windows

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3527

Tests/CMakeLists.txt

@@ -416,7 +416,6 @@ if(BUILD_TESTING)
   ADD_TEST_MACRO(COnly COnly)
   ADD_TEST_MACRO(CxxOnly CxxOnly)
   ADD_TEST_MACRO(CxxSubdirC CxxSubdirC)
-  ADD_TEST_MACRO(IPO COnly/COnly)
   ADD_TEST_MACRO(OutDir runtime/OutDir)
   ADD_TEST_MACRO(OutName exe.OutName.exe)
   ADD_TEST_MACRO(ObjectLibrary UseCshared)

Tests/IPO/CMakeLists.txt

@@ -1,7 +0,0 @@
-cmake_minimum_required (VERSION 2.8)
-project(IPO NONE)
-
-set_property(DIRECTORY PROPERTY INTERPROCEDURAL_OPTIMIZATION 1)
-
-add_subdirectory(../COnly COnly)
-add_subdirectory(../CxxOnly CxxOnly)

Tests/Module/CheckIPOSupported-C/CMakeLists.txt

@@ -13,8 +13,18 @@ elseif(CMake_TEST_IPO_WORKS_C)
 endif()
 
 add_library(foo foo.c)
+if(NOT CYGWIN AND (NOT WIN32 OR "x${CMAKE_C_COMPILER_ID}" STREQUAL "xClang"))
+  add_library(bar SHARED bar.c)
+  if(WIN32)
+    # Bindexplib for clang supports LTO objects
+    set_target_properties(bar PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS ON)
+  endif()
+else()
+  # TODO: bindexplib doesn't support exporting IPO symbols with other compilers on Windows
+  add_library(bar STATIC bar.c)
+endif()
 add_executable(CheckIPOSupported-C main.c)
-target_link_libraries(CheckIPOSupported-C PUBLIC foo)
+target_link_libraries(CheckIPOSupported-C PUBLIC foo bar)
 
 enable_testing()
 add_test(NAME CheckIPOSupported-C COMMAND CheckIPOSupported-C)

Tests/Module/CheckIPOSupported-C/bar.c

@@ -0,0 +1,4 @@
+int bar()
+{
+  return 0x42;
+}

Tests/Module/CheckIPOSupported-C/main.c

@@ -1,8 +1,9 @@
 int foo();
+int bar();
 
 int main()
 {
-  if (foo() == 0) {
+  if (foo() != bar()) {
     return 1;
   }
   return 0;

Tests/Module/CheckIPOSupported-CXX/CMakeLists.txt

@@ -12,9 +12,20 @@ elseif(CMake_TEST_IPO_WORKS_CXX)
   message(FATAL_ERROR "IPO expected to work, but the check failed:\n  ${ipo_output}")
 endif()
 
-add_library(foo foo.cpp)
+
+add_library(foo STATIC foo.cpp)
+if(NOT CYGWIN AND (NOT WIN32 OR "x${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang"))
+  add_library(bar SHARED bar.cpp)
+  if(WIN32)
+    # Bindexplib for clang supports LTO objects
+    set_target_properties(bar PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS ON)
+  endif()
+else()
+  # TODO: bindexplib doesn't support exporting IPO symbols with other compilers on Windows
+  add_library(bar STATIC bar.cpp)
+endif()
 add_executable(CheckIPOSupported-CXX main.cpp)
-target_link_libraries(CheckIPOSupported-CXX PUBLIC foo)
+target_link_libraries(CheckIPOSupported-CXX PUBLIC foo bar)
 
 enable_testing()
 add_test(NAME CheckIPOSupported-CXX COMMAND CheckIPOSupported-CXX)

Tests/Module/CheckIPOSupported-CXX/bar.cpp

@@ -0,0 +1,4 @@
+int bar()
+{
+  return 0x42;
+}

Tests/Module/CheckIPOSupported-CXX/main.cpp

@@ -1,8 +1,9 @@
 int foo();
+int bar();
 
 int main()
 {
-  if (foo() == 0) {
+  if (foo() != bar()) {
     return 1;
   }
   return 0;