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Enable "-fsized-deallocation" iif deallocation functions are present

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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
This commit is contained in:
tenzap 2021-11-24 19:01:00 +01:00 committed by Jonathan White
parent 07564d533a
commit 84f245badb
1 changed files with 12 additions and 1 deletions
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13
CMakeLists.txt
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@ -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 <new>
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++")