mirror of
https://github.com/fmtlib/fmt.git
synced 2024-12-25 06:21:00 +00:00
82 lines
2.3 KiB
CMake
82 lines
2.3 KiB
CMake
# C++14 feature support detection
|
|
|
|
include(CheckCXXSourceCompiles)
|
|
include(CheckCXXCompilerFlag)
|
|
|
|
if (NOT CMAKE_CXX_STANDARD)
|
|
set(CMAKE_CXX_STANDARD 11)
|
|
endif()
|
|
message(STATUS "CXX_STANDARD: ${CMAKE_CXX_STANDARD}")
|
|
|
|
if (CMAKE_CXX_STANDARD EQUAL 20)
|
|
check_cxx_compiler_flag(-std=c++20 has_std_20_flag)
|
|
check_cxx_compiler_flag(-std=c++2a has_std_2a_flag)
|
|
|
|
if (has_std_20_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++20)
|
|
elseif (has_std_2a_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++2a)
|
|
endif ()
|
|
elseif (CMAKE_CXX_STANDARD EQUAL 17)
|
|
check_cxx_compiler_flag(-std=c++17 has_std_17_flag)
|
|
check_cxx_compiler_flag(-std=c++1z has_std_1z_flag)
|
|
|
|
if (has_std_17_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++17)
|
|
elseif (has_std_1z_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++1z)
|
|
endif ()
|
|
elseif (CMAKE_CXX_STANDARD EQUAL 14)
|
|
check_cxx_compiler_flag(-std=c++14 has_std_14_flag)
|
|
check_cxx_compiler_flag(-std=c++1y has_std_1y_flag)
|
|
|
|
if (has_std_14_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++14)
|
|
elseif (has_std_1y_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++1y)
|
|
endif ()
|
|
elseif (CMAKE_CXX_STANDARD EQUAL 11)
|
|
check_cxx_compiler_flag(-std=c++11 has_std_11_flag)
|
|
check_cxx_compiler_flag(-std=c++0x has_std_0x_flag)
|
|
|
|
if (has_std_11_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++11)
|
|
elseif (has_std_0x_flag)
|
|
set(CXX_STANDARD_FLAG -std=c++0x)
|
|
endif ()
|
|
endif ()
|
|
|
|
set(CMAKE_REQUIRED_FLAGS ${CXX_STANDARD_FLAG})
|
|
|
|
# Check if variadic templates are working and not affected by GCC bug 39653:
|
|
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39653
|
|
# Can be removed once gcc 4.4 support is dropped.
|
|
check_cxx_source_compiles("
|
|
template <class T, class ...Types>
|
|
struct S { typedef typename S<Types...>::type type; };
|
|
int main() {}" SUPPORTS_VARIADIC_TEMPLATES)
|
|
if (NOT SUPPORTS_VARIADIC_TEMPLATES)
|
|
set (SUPPORTS_VARIADIC_TEMPLATES OFF)
|
|
endif ()
|
|
|
|
# Check if user-defined literals are available
|
|
check_cxx_source_compiles("
|
|
void operator\"\" _udl(long double);
|
|
int main() {}"
|
|
SUPPORTS_USER_DEFINED_LITERALS)
|
|
if (NOT SUPPORTS_USER_DEFINED_LITERALS)
|
|
set (SUPPORTS_USER_DEFINED_LITERALS OFF)
|
|
endif ()
|
|
|
|
# Check if <variant> is available
|
|
set(CMAKE_REQUIRED_FLAGS -std=c++1z)
|
|
check_cxx_source_compiles("
|
|
#include <variant>
|
|
int main() {}"
|
|
FMT_HAS_VARIANT)
|
|
if (NOT FMT_HAS_VARIANT)
|
|
set (FMT_HAS_VARIANT OFF)
|
|
endif ()
|
|
|
|
set(CMAKE_REQUIRED_FLAGS )
|