C++ C++；Cmake不'；t在Travis CI服务器上设置编译器语言标准

我正在开发一个自己的开源编程语言解释器项目，我可能会犯一些愚蠢的错误，因为我在

Cmake

方面不够成熟，我第一次尝试

Travis CI

。我的项目在我的

PC

（运行

Ubuntu16.04LTS

、

GCC 8.1

和

Cmake 3.12.0-rc2

）上通过执行

scripts/build\u all.sh

从bash终端编译，测试由

scripts/run\u tests.sh

执行。 构建脚本创建一个

cmake Build debug

目录，运行cmake和than builds，并执行简单的

cmake Build debug/lexertl\u gen/lexert\u gen.out

程序，在my

include

文件夹中为主项目生成头文件。之后，它将在编译选项

std=gnu++2a

下构建主项目及其测试

以下是我所有的

CMakeLists.txt

（问题如下所述）：

根CMakeLists.txt

cmake_minimum_required(VERSION 3.9.0)

set(INCLUDE_ROOT "/usr/local/include")
set(BOOST_ROOT   "${INCLUDE_ROOT}/boost_1_67_0")
set(LEXERTL_ROOT "${INCLUDE_ROOT}/lexertl")
set(GTEST_ROOT   "${INCLUDE_ROOT}/googletest")

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

file(GLOB SOURCES "src/*.cpp")
include_directories(include ${BOOST_ROOT} ${LEXERTL_ROOT} ${GTEST_ROOT})

add_library(calamity_core ${SOURCES})

    project(lexer.out)
    add_executable(${PROJECT_NAME} main_lexer.cpp)
    target_link_libraries(${PROJECT_NAME} m calamity_core)

    project(parser.out)
    add_executable(${PROJECT_NAME} main_parser.cpp)
    target_link_libraries(${PROJECT_NAME} m calamity_core)

    project(tests.out)
    add_subdirectory(tests)

    project(lexertl_gen.out)
    add_subdirectory(lexertl_gen)

cmake_minimum_required(VERSION 3.9.0)

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

add_subdirectory(/usr/local/include/googletest ../gtets-build)

add_executable(${PROJECT_NAME} tests.cpp)
target_link_libraries(${PROJECT_NAME} gtest gtest_main gmock calamity_core)

cmake_minimum_required(VERSION 3.9.0)

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

set(SOURCES ../src/token.cpp
            ../src/var_substring.cpp
            ../src/cui.cpp
            ../src/message_exception.cpp)

add_executable(lexertl_gen.out main_lexertl_gen.cpp ${SOURCES})

测试/CMakeLists.txt

cmake_minimum_required(VERSION 3.9.0)

set(INCLUDE_ROOT "/usr/local/include")
set(BOOST_ROOT   "${INCLUDE_ROOT}/boost_1_67_0")
set(LEXERTL_ROOT "${INCLUDE_ROOT}/lexertl")
set(GTEST_ROOT   "${INCLUDE_ROOT}/googletest")

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

file(GLOB SOURCES "src/*.cpp")
include_directories(include ${BOOST_ROOT} ${LEXERTL_ROOT} ${GTEST_ROOT})

add_library(calamity_core ${SOURCES})

    project(lexer.out)
    add_executable(${PROJECT_NAME} main_lexer.cpp)
    target_link_libraries(${PROJECT_NAME} m calamity_core)

    project(parser.out)
    add_executable(${PROJECT_NAME} main_parser.cpp)
    target_link_libraries(${PROJECT_NAME} m calamity_core)

    project(tests.out)
    add_subdirectory(tests)

    project(lexertl_gen.out)
    add_subdirectory(lexertl_gen)

cmake_minimum_required(VERSION 3.9.0)

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

add_subdirectory(/usr/local/include/googletest ../gtets-build)

add_executable(${PROJECT_NAME} tests.cpp)
target_link_libraries(${PROJECT_NAME} gtest gtest_main gmock calamity_core)

cmake_minimum_required(VERSION 3.9.0)

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

set(SOURCES ../src/token.cpp
            ../src/var_substring.cpp
            ../src/cui.cpp
            ../src/message_exception.cpp)

add_executable(lexertl_gen.out main_lexertl_gen.cpp ${SOURCES})

lexertl\u gen/CMakeLists.txt

cmake_minimum_required(VERSION 3.9.0)

set(INCLUDE_ROOT "/usr/local/include")
set(BOOST_ROOT   "${INCLUDE_ROOT}/boost_1_67_0")
set(LEXERTL_ROOT "${INCLUDE_ROOT}/lexertl")
set(GTEST_ROOT   "${INCLUDE_ROOT}/googletest")

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

file(GLOB SOURCES "src/*.cpp")
include_directories(include ${BOOST_ROOT} ${LEXERTL_ROOT} ${GTEST_ROOT})

add_library(calamity_core ${SOURCES})

    project(lexer.out)
    add_executable(${PROJECT_NAME} main_lexer.cpp)
    target_link_libraries(${PROJECT_NAME} m calamity_core)

    project(parser.out)
    add_executable(${PROJECT_NAME} main_parser.cpp)
    target_link_libraries(${PROJECT_NAME} m calamity_core)

    project(tests.out)
    add_subdirectory(tests)

    project(lexertl_gen.out)
    add_subdirectory(lexertl_gen)

cmake_minimum_required(VERSION 3.9.0)

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

add_subdirectory(/usr/local/include/googletest ../gtets-build)

add_executable(${PROJECT_NAME} tests.cpp)
target_link_libraries(${PROJECT_NAME} gtest gtest_main gmock calamity_core)

cmake_minimum_required(VERSION 3.9.0)

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough")

set(SOURCES ../src/token.cpp
            ../src/var_substring.cpp
            ../src/cui.cpp
            ../src/message_exception.cpp)

add_executable(lexertl_gen.out main_lexertl_gen.cpp ${SOURCES})

最终，我决定将

travisci

添加到我的项目中。我编写了一个

bootstrap.sh

脚本来安装和配置所有依赖项（我还安装了

gcc8.1

，因为安装在

travisci

服务器上的默认

gcc4.8.4

不支持

gnu++2a

）。这个脚本运行良好，但是在运行<代码>脚本/构建所有.SH <代码> >代码> Travis CI >代码>服务器GCC没有设置<代码> GNU+2A<代码>，用于编译我的主要项目，并使用测试，抱怨使用<代码>内联变量，<代码> STD:：ISSO积分和其他现代C++的东西，明确提到这些功能在

std=c++17

或

std=gnu++17

下受支持

我不明白，因为我更新了

GCC

，我的第一个简单代码生成器程序运行良好（尽管如果我从

tests/CMakeLists.txt

中删除

set（CMAKE\u CXX\u FLAGS…

），这个程序在我的

PC

上编译，但在

Travis CI

服务器上也不编译）。我在这里干什么？是因为Travis使用的

Cmake 3.9

My

.travis.yml

配置文件：

language: cpp
sudo: required
dist: trusty
compiler:
- g++
os:
- linux
script:
- ./bootstrap.sh; cd scripts; ./build_all.sh; ./run_tests.sh
env:
  global:
  - LANG="en_US.UTF-8"

matrix:
  include:
    - os: linux
      addons:
        apt:
          compiler: gcc
          sources:
            - ubuntu-toolchain-r-test
          packages:
            - g++-8
          env: COMPILER=g++-8

---

（很抱歉为空

README.md

）

我终于解决了一个问题，将

CMAKE\u CXX\u FLAGS

作为缓存变量：

set(CMAKE_CXX_FLAGS "-g -std=gnu++2a -Werror \
                     -Wno-error=variadic-macros \
                     -Werror=implicit-fallthrough"
                    CACHE STRING "compiler flags")

虽然我不认为这是一个漂亮的解决方案，但我仍然不明白为什么它在我的

PC

上编译，而不是在

travisci