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CMake: Add workaround for setting -std= below 3.1.3

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Previously, if the user had a CMake version below 3.1.3, we told them to
set `-std` themselves.

However, we are going to go to C99 soon (because of FAudio, see #869),
and CentOS 7's CMake is too old to set `-std=` automatically, defaulting
to C90. This is bad because it fails the CI.

To work around this, we set `-std=` ourselves, but first we have to
clear any existing `-std=` flag in C_FLAGS or CXX_FLAGS. Amusingly
enough, MSVC does not have `/std:` switches for either C90 or C++98, so
we just get to do nothing.
This commit is contained in:
Misa 2022-03-21 20:07:37 -07:00
parent 226b5610b0
commit f6d7a214f8
1 changed files with 11 additions and 1 deletions
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12
desktop_version/CMakeLists.txt
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@ -25,7 +25,17 @@ if(OFFICIAL_BUILD AND NOT MAKEANDPLAY)
endif()
if(${CMAKE_VERSION} VERSION_LESS "3.1.3")
message(WARNING "Your CMake version is too old; set -std=c90 -std=c++98 yourself!")
message(WARNING "Your CMake version is too old; using workaround")
if(MSVC)
# MSVC doesn't have /std:c90 or /std:c++98 switches!
else()
string(REGEX REPLACE "-std=[a-z0-9]+" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c90")
string(REGEX REPLACE "-std=[a-z0-9+]+" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")
endif()
else()
set(CMAKE_C_STANDARD 90)
set(CMAKE_C_EXTENSIONS OFF)