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sim: Use c++14 for LIBCXX

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The compiler default varies among the environment.
Especially, the default std version for xcode clang doesn't work
for libcxx.

This commit just ensures to use the consistent std version
among compilers.  we can come up with a more sophisticated way
to control the version later if desiable.

clang/macOS (from xcode):

    spacetanuki% c++ -dM -E -x c++ /dev/null | grep __cplusplus
    #define __cplusplus 199711L
    spacetanuki% c++ --version
    Apple clang version 11.0.0 (clang-1100.0.33.17)
    Target: x86_64-apple-darwin18.7.0
    Thread model: posix
    InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
    spacetanuki%

clang/macOS (from homebrew):

    spacetanuki% /usr/local/Cellar/llvm/11.0.0/bin/clang++ -dM -E -x c++ /dev/null | grep __cplusplus
    #define __cplusplus 201402L
    spacetanuki% /usr/local/Cellar/llvm/11.0.0/bin/clang++ --version
    clang version 11.0.0
    Target: x86_64-apple-darwin18.7.0
    Thread model: posix
    InstalledDir: /usr/local/Cellar/llvm/11.0.0/bin
    spacetanuki%

gcc/ubuntu:

    root@477d94753e9b:/# c++ -dM -E -x c++ /dev/null | grep __cplusplus
    #define __cplusplus 201402L
    root@477d94753e9b:/# c++ --version
    c++ (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
    Copyright (C) 2019 Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.  There is NO
    warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    root@477d94753e9b:/#
This commit is contained in:
YAMAMOTO Takashi
2020-12-22 10:50:12 +09:00
committed by Xiang Xiao
parent 27a49331fc
commit 4e6adefc2b
1 changed files with 9 additions and 0 deletions
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boards/sim/sim/sim/scripts/Make.defs
+9
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@@ -106,6 +106,15 @@ CPPFLAGS := $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) \
AFLAGS := $(CFLAGS) -D__ASSEMBLY__
ifeq ($(CONFIG_LIBCXX),y)
# Why c++14?
# * libcxx seems to require c++11.
# * The compiler defaults varies:
# clang/macOS (from xcode): 199711L
# gcc/ubuntu: 201402L
# * There is a precedent to use c++14.
# (boards/arm/stm32l4/nucleo-l476rg/scripts/Make.defs)
CXXFLAGS += -std=c++14
ifeq ($(CONFIG_HOST_MACOS),y)
# macOS uses libc++abi
CXXFLAGS += -DLIBCXX_BUILDING_LIBCXXABI