Check for support before adding bigtoc linker flag
Fixes: #20076
diff --git a/CompileFlags.cmake b/CompileFlags.cmake
index 91f2adf..053259f 100644
--- a/CompileFlags.cmake
+++ b/CompileFlags.cmake
@@ -54,12 +54,20 @@
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} ${bigTocFlag}")
+ endif()
endif()
if (CMAKE_CXX_COMPILER_ID STREQUAL SunPro AND
diff --git a/Source/Modules/CheckCXXLinkerFlag.cmake b/Source/Modules/CheckCXXLinkerFlag.cmake
new file mode 100644
index 0000000..9ad2ad6
--- /dev/null
+++ b/Source/Modules/CheckCXXLinkerFlag.cmake
@@ -0,0 +1,25 @@
+# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+include_guard(GLOBAL)
+include(CheckCXXSourceCompiles)
+include(CMakeCheckCompilerFlagCommonPatterns)
+
+function(check_cxx_linker_flag _flag _var)
+ set(CMAKE_REQUIRED_LIBRARIES "${_flag}")
+
+ # 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()
