From 84f245badb87ba80229fb9ac50ed5a2667ed06fb Mon Sep 17 00:00:00 2001 From: tenzap Date: Wed, 24 Nov 2021 19:01:00 +0100 Subject: [PATCH] Enable "-fsized-deallocation" iif deallocation functions are present On some systems, although "-fsized-deallocation" compiler flag is there, compilation will fail because some deallocation functions are missing. Typically 'operator delete ( void* ptr, std::size_t sz )' is missing on some macOS systems. This will check their presence. On macOS we can have this case when using a compiler that supports the flag, while the OS doesn't have all the deallocation functions. Typically, ::operator delete(ptr, size) appeared in macOS 10.12 Reported error was: error: call to unavailable function 'operator delete': introduced in macOS 10.12 --- CMakeLists.txt | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/CMakeLists.txt b/CMakeLists.txt index c6c0b45b6..216a03a17 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -318,7 +318,18 @@ set(CMAKE_C_STANDARD 99) set(CMAKE_CXX_STANDARD 17) set(CMAKE_CXX_STANDARD_REQUIRED ON) -check_add_gcc_compiler_flag("-fsized-deallocation" CXX) +check_cxx_compiler_flag("-fsized-deallocation" CXX_HAS_fsized_deallocation) +if(CXX_HAS_fsized_deallocation) + # Do additional check: the deallocation functions must be there too. + set(CMAKE_REQUIRED_FLAGS "-fsized-deallocation") + check_cxx_source_compiles("#include + int main() { void * ptr = nullptr; std::size_t size = 1; ::operator delete(ptr, size); }" + HAVE_DEALLOCATION_FUNCTIONS) + if(HAVE_DEALLOCATION_FUNCTIONS) + check_add_gcc_compiler_flag("-fsized-deallocation" CXX) + endif() + unset(CMAKE_REQUIRED_FLAGS) +endif() if(APPLE AND CMAKE_COMPILER_IS_CLANGXX) add_gcc_compiler_cxxflags("-stdlib=libc++")