Fix CMake CXX_STANDARD handling

https://sigrok.org/gitweb/?p=pulseview.git;a=commit;f=CMakeLists.txt;h=fa8d0fcb4cff4f19943fe3ff152dc1428b400b01 introduced a CXX_STANDARD value of 17 while still only requiring cmake 2.8.12.

However, https://cmake.org/cmake/help/latest/prop_tgt/CXX_STANDARD.html#cxx-standard shows that a value of 17 was introduced with cmake 3.8, leading to

"CXX_STANDARD is set to invalid value '17'" when trying to build with cmake < 3.8.

Hence, for versions below 3.8, we only check for up to 14.
This commit is contained in:
Soeren Apel 2023-09-08 21:15:11 +02:00
parent e0a90b4c5d
commit cb40d40c6c
1 changed files with 32 additions and 16 deletions

View File

@ -83,23 +83,39 @@ include(memaccess)
find_package(PkgConfig)
check_cxx_compiler_flag("-std=c++17" HAVE_STD_CXX_17)
check_cxx_compiler_flag("-std=c++14" HAVE_STD_CXX_14)
check_cxx_compiler_flag("-std=c++11" HAVE_STD_CXX_11)
if(HAVE_STD_CXX_17)
message(STATUS "Using C++17 for the application build")
set(CMAKE_CXX_STANDARD 17)
set(REQUIRED_STD_CXX_FLAGS "-std=c++17")
elseif(HAVE_STD_CXX_14)
message(STATUS "Using C++14 for the application build")
set(CMAKE_CXX_STANDARD 14)
set(REQUIRED_STD_CXX_FLAGS "-std=c++14")
elseif(HAVE_STD_CXX_11)
message(STATUS "Using C++11 for the application build")
set(CMAKE_CXX_STANDARD 11)
set(REQUIRED_STD_CXX_FLAGS "-std=c++11")
if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.8.0")
check_cxx_compiler_flag("-std=c++17" HAVE_STD_CXX_17)
check_cxx_compiler_flag("-std=c++14" HAVE_STD_CXX_14)
check_cxx_compiler_flag("-std=c++11" HAVE_STD_CXX_11)
if(HAVE_STD_CXX_17)
message(STATUS "Using C++17 for the application build")
set(CMAKE_CXX_STANDARD 17)
set(REQUIRED_STD_CXX_FLAGS "-std=c++17")
elseif(HAVE_STD_CXX_14)
message(STATUS "Using C++14 for the application build")
set(CMAKE_CXX_STANDARD 14)
set(REQUIRED_STD_CXX_FLAGS "-std=c++14")
elseif(HAVE_STD_CXX_11)
message(STATUS "Using C++11 for the application build")
set(CMAKE_CXX_STANDARD 11)
set(REQUIRED_STD_CXX_FLAGS "-std=c++11")
else()
message(FATAL_ERROR "Need modern C++, at least language standard 11")
endif()
else()
message(FATAL_ERROR "Need modern C++, at least language standard 11")
check_cxx_compiler_flag("-std=c++14" HAVE_STD_CXX_14)
check_cxx_compiler_flag("-std=c++11" HAVE_STD_CXX_11)
if(HAVE_STD_CXX_14)
message(STATUS "Using C++14 for the application build")
set(CMAKE_CXX_STANDARD 14)
set(REQUIRED_STD_CXX_FLAGS "-std=c++14")
elseif(HAVE_STD_CXX_11)
message(STATUS "Using C++11 for the application build")
set(CMAKE_CXX_STANDARD 11)
set(REQUIRED_STD_CXX_FLAGS "-std=c++11")
else()
message(FATAL_ERROR "Need modern C++, at least language standard 11")
endif()
endif()
list(APPEND PKGDEPS glib-2.0>=2.28.0)