Merge branch 'backport-3.16-toc_on_ppc' into toc_on_ppc

CompileFlags.cmake

@@ -54,12 +54,20 @@ if(CMAKE_SYSTEM_PROCESSOR MATCHES "^parisc")
 endif()
 
 # Workaround for TOC Overflow on ppc64
+set(bigTocFlag "")
 if(CMAKE_SYSTEM_NAME STREQUAL "AIX" AND
    CMAKE_SYSTEM_PROCESSOR MATCHES "powerpc")
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-bbigtoc")
+  set(bigTocFlag "-Wl,-bbigtoc")
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
    CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64")
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--no-multi-toc")
+  set(bigTocFlag "-Wl,--no-multi-toc")
+endif()
+if(bigTocFlag)
+  include(CheckCXXLinkerFlag)
+  check_cxx_linker_flag(${bigTocFlag} BIG_TOC_FLAG_SUPPORTED)
+  if(BIG_TOC_FLAG_SUPPORTED)
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${bigTocFlag}")
+  endif()
 endif()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL SunPro AND

Source/Modules/CheckCXXLinkerFlag.cmake

@@ -0,0 +1,29 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+include_guard(GLOBAL)
+include(CheckCXXSourceCompiles)
+include(CMakeCheckCompilerFlagCommonPatterns)
+
+function(check_cxx_linker_flag _flag _var)
+  if(CMAKE_VERSION VERSION_LESS "3.14")
+    set(CMAKE_REQUIRED_LIBRARIES "${_flag}")
+  else()
+    set(CMAKE_REQUIRED_LINK_OPTIONS "${_flag}")
+  endif()
+
+  # Normalize locale during test compilation.
+  set(_locale_vars LC_ALL LC_MESSAGES LANG)
+  foreach(v IN LISTS _locale_vars)
+    set(_locale_vars_saved_${v} "$ENV{${v}}")
+    set(ENV{${v}} C)
+  endforeach()
+  check_compiler_flag_common_patterns(_common_patterns)
+  check_cxx_source_compiles("int main() { return 0; }" ${_var}
+    ${_common_patterns}
+    )
+  foreach(v IN LISTS _locale_vars)
+    set(ENV{${v}} ${_locale_vars_saved_${v}})
+  endforeach()
+  set(${_var} "${${_var}}" PARENT_SCOPE)
+endfunction()

Source/cmCommands.cxx

@@ -78,6 +78,7 @@
 #include "cmTargetCompileOptionsCommand.h"
 #include "cmTargetIncludeDirectoriesCommand.h"
 #include "cmTargetLinkLibrariesCommand.h"
+#include "cmTargetLinkOptionsCommand.h"
 #include "cmTargetPrecompileHeadersCommand.h"
 #include "cmTargetSourcesCommand.h"
 #include "cmTryCompileCommand.h"
@@ -107,7 +108,6 @@
 #  include "cmSourceGroupCommand.h"
 #  include "cmSubdirDependsCommand.h"
 #  include "cmTargetLinkDirectoriesCommand.h"
-#  include "cmTargetLinkOptionsCommand.h"
 #  include "cmUseMangledMesaCommand.h"
 #  include "cmUtilitySourceCommand.h"
 #  include "cmVariableRequiresCommand.h"
@@ -257,6 +257,7 @@ void GetProjectCommands(cmState* state)
                            cmTargetIncludeDirectoriesCommand);
   state->AddBuiltinCommand("target_link_libraries",
                            cmTargetLinkLibrariesCommand);
+  state->AddBuiltinCommand("target_link_options", cmTargetLinkOptionsCommand);
   state->AddBuiltinCommand("target_sources", cmTargetSourcesCommand);
   state->AddBuiltinCommand("try_compile",
                            cm::make_unique<cmTryCompileCommand>());
@@ -277,7 +278,6 @@ void GetProjectCommands(cmState* state)
   state->AddBuiltinCommand("install_programs", cmInstallProgramsCommand);
   state->AddBuiltinCommand("add_link_options", cmAddLinkOptionsCommand);
   state->AddBuiltinCommand("link_libraries", cmLinkLibrariesCommand);
-  state->AddBuiltinCommand("target_link_options", cmTargetLinkOptionsCommand);
   state->AddBuiltinCommand("target_link_directories",
                            cmTargetLinkDirectoriesCommand);
   state->AddBuiltinCommand("qt_wrap_cpp", cmQTWrapCPPCommand);

bootstrap

@@ -437,6 +437,7 @@ CMAKE_CXX_SOURCES="\
   cmTargetCompileOptionsCommand \
   cmTargetIncludeDirectoriesCommand \
   cmTargetLinkLibrariesCommand \
+  cmTargetLinkOptionsCommand \
   cmTargetPrecompileHeadersCommand \
   cmTargetPropCommandBase \
   cmTargetPropertyComputer \