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SCons: Explicitly define our C (C11) and C++ (C++14) standards

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On GCC and Clang, we use C11 and C++14 with GNU extensions (`std=gnu11`
and `std=gnu++14`). Those are the defaults for current GCC and Clang,
and also match the feature sets we want to use in Godot.

On MSVC, we require C++14 support explicitly with `/std:c++14`, and
make it strict with the use of `/permissive-` (so features of C++17 or
later can't be used).

Moves the definition before querying environment flags and platform
config so that it can be overridden when necessary.

(cherry picked from commit 342f127362)
This commit is contained in:
Rémi Verschelde 2020-02-20 11:09:20 +01:00
parent 1350c1371e
commit c34b351b24
2 changed files with 15 additions and 4 deletions
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18
SConstruct
View file

@ -291,6 +291,7 @@ if selected_platform in platform_list:
if env["extra_suffix"] != '':
env.extra_suffix += '.' + env["extra_suffix"]
# Environment flags
CCFLAGS = env.get('CCFLAGS', '')
env['CCFLAGS'] = ''
env.Append(CCFLAGS=str(CCFLAGS).split())
@ -307,17 +308,28 @@ if selected_platform in platform_list:
env['LINKFLAGS'] = ''
env.Append(LINKFLAGS=str(LINKFLAGS).split())
# Platform specific flags
flag_list = platform_flags[selected_platform]
for f in flag_list:
if not (f[0] in ARGUMENTS): # allow command line to override platform flags
env[f[0]] = f[1]
# must happen after the flags, so when flags are used by configure, stuff happens (ie, ssl on x11)
# Must happen after the flags definition, so that they can be used by platform detect
detect.configure(env)
# Enable C++11 support
# Set our C and C++ standard requirements.
# Prepending to make it possible to override
# This needs to come after `configure`, otherwise we don't have env.msvc.
if not env.msvc:
env.Append(CXXFLAGS=['-std=c++11'])
# Specifying GNU extensions support explicitly, which are supported by
# both GCC and Clang. This mirrors GCC and Clang's current default
# compile flags if no -std is specified.
env.Prepend(CFLAGS=['-std=gnu11'])
env.Prepend(CXXFLAGS=['-std=gnu++14'])
else:
# MSVC doesn't have clear C standard support, /std only covers C++.
# We apply it to CCFLAGS (both C and C++ code) in case it impacts C features.
env.Prepend(CCFLAGS=['/std:c++14'])
# Configure compiler warnings
if env.msvc:

1
platform/android/detect.py
View file

@ -205,7 +205,6 @@ def configure(env):
env.Append(CPPFLAGS=["-isystem", env["ANDROID_NDK_ROOT"] + "/sources/cxx-stl/llvm-libc++/include"])
env.Append(CPPFLAGS=["-isystem", env["ANDROID_NDK_ROOT"] + "/sources/cxx-stl/llvm-libc++abi/include"])
env.Append(CXXFLAGS=["-std=gnu++14"])
# Disable exceptions and rtti on non-tools (template) builds
if env['tools']: