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CMake: Group compiler-default checks into a function

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Maarten Bent 2024-01-28 14:17:19 +01:00
parent 8aad6ba37a
commit 57ed33978d
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GPG key ID: 58AAEE3F4A4FD070
1 changed files with 26 additions and 30 deletions
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56
build/cmake/init.cmake
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@ -8,12 +8,7 @@
# Licence: wxWindows licence
#############################################################################
if(DEFINED wxBUILD_CXX_STANDARD AND NOT wxBUILD_CXX_STANDARD STREQUAL COMPILER_DEFAULT)
set(CMAKE_CXX_STANDARD ${wxBUILD_CXX_STANDARD})
set(CMAKE_CXX_STANDARD_REQUIRED ON)
else()
# If the standard is not set explicitly, check whether we can use C++11
# without any special options.
function(checkCompilerDefaults)
include(CheckCXXSourceCompiles)
check_cxx_source_compiles("
#include <vector>
@ -24,6 +19,28 @@ else()
return v[0];
}"
wxHAVE_CXX11)
check_cxx_source_compiles("
#if defined(_MSVC_LANG)
#if _MSVC_LANG < 201703L
#error C++17 support is required
#endif
#elif __cplusplus < 201703L
#error C++17 support is required
#endif
int main() {
[[maybe_unused]] auto unused = 17;
}"
wxHAVE_CXX17)
endfunction()
if(DEFINED wxBUILD_CXX_STANDARD AND NOT wxBUILD_CXX_STANDARD STREQUAL COMPILER_DEFAULT)
set(CMAKE_CXX_STANDARD ${wxBUILD_CXX_STANDARD})
set(CMAKE_CXX_STANDARD_REQUIRED ON)
else()
# If the standard is not set explicitly, check whether we can use C++11
# without any special options.
checkCompilerDefaults()
if(NOT wxHAVE_CXX11)
# If not, request it explicitly and let CMake check if it's supported.
set(CMAKE_CXX_STANDARD 11)
@ -505,30 +522,9 @@ if(wxUSE_GUI)
endif()
if(wxUSE_WEBVIEW_CHROMIUM)
# Check for C++17 support as it's required by CEF: we trust
# CMAKE_CXX_STANDARD if it is defined, but we need to compile a
# test program if it is not because the compiler could be
# supporting C++17 anyway.
if (DEFINED CMAKE_CXX_STANDARD)
if (CMAKE_CXX_STANDARD GREATER_EQUAL 17)
set(wxHAVE_CXX17 ON)
endif()
else()
check_cxx_source_compiles("
#if defined(_MSVC_LANG)
#if _MSVC_LANG < 201703L
#error C++17 support is required
#endif
#elif __cplusplus < 201703L
#error C++17 support is required
#endif
int main() {
[[maybe_unused]] auto unused = 17;
}"
wxHAVE_CXX17)
endif()
if (NOT wxHAVE_CXX17)
# CEF requires C++17: we trust CMAKE_CXX_STANDARD if it is defined,
# or the previously tested wxHAVE_CXX17 if the compiler supports C++17 anyway.
if(NOT (CMAKE_CXX_STANDARD GREATER_EQUAL 17 OR wxHAVE_CXX17))
# We shouldn't disable this option as it's disabled by default and
# if it is on, it means that CEF is meant to be used, but we can't
# continue neither as libcef_dll_wrapper will fail to build