在QtCreator中使用MSVC编译套件构建项目时,在Kits对话框中编译器一栏会识别出许多MSVC编译套件,在实际项目开发中,如何选择这些编译套件呢,本文就这个问题展开,主要内容如下:
(1)描述Visual Studio下的命令行工具的环境变量和几种命令提示符。
(2)描述Visual Studio的命令文件。
(3)描述QtCreator对MSVC编译套价的识别。
(注1:本文的前提是已经完成对Visual Studio集成开发工具的安装,如果没有安装,QtCreator将会找不到MSVC相关的编译套件!)
(注2:本文基于完整安装的Visual Studio集成开发工具。单独安装MSVC编译套件不在本文讨论范围内!哈哈)
MSVC的命令行工具会使用 PATH、TMP、INCLUDE、LIB 和 LIBPATH环境变量,还会使用一些特定的已安装工具、平台和 SDK 的环境变量。 即使是简单 Visual Studio 安装,也会设置二十多个或更多的环境变量。 这些环境变量非常多,所以如果在Windows环境变量中自行单个添加,可能会把自己折腾惨,哈哈!所以在使用MSVC的命令行工具时,必须使用命令提示符快捷方式 或自定义命令文件来设置环境变量。 不建议在Windows环境中自行设置环境变量。
在windows的命令行和MSVC命令行下分别输入set
命令,可以查看环境变量,如下图所示:
左边是windows的命令行,右边是MSVC命令行,可见在MSVC命令行下新建了许多环境变量(PATH、TMP、INCLUDE、LIB 和 LIBPATH)且添加了很多值。这些环境变量,在我们使用命令行来构建项目工程时,都会使用到,缺一不可!
命令提示符本质是对windows命令行的一个脚本。在安装Visual Studio后,命令提示符快捷方式会安装在Windows“开始”菜单中特定版本的 Visual Studio 文件夹中,大致结构如下:
(注:由于选择的工具负载不同,命令提示符会有所不同,本文选择的是C++桌面应用构建相关的负载,且只选择了几种工具套件组合)
安装后,结果如下图所示:
【备注】多个命令行工具或工具选项可能需要管理员权限。 如果在使用这些命令行时遇到权限问题,建议使用“以管理员身份运行”选项打开开发人员命令提示窗口 。 右键单击以打开命令提示窗口的快捷菜单,然后依次选择“更多”、“以管理员身份运行” 。
对于 2019 Visual Studio,64 位系统上的典型安装位置是位于\Program Files\Microsoft Visual Studio\2022
开发人员的命令提示符命令文件 VsDevCmd.bat位于 Common7\Tools 子目录中。如果未指定参数,该命令文件会设置使用x86 生成 32 位 x86 代码的开发环境。
命令文件将设置默认参数并调用 VsDevCmd.bat脚本去设置指定的生成体系结构环境。 典型安装可能包括以下命令文件:
注意vcvarsall.bat 文件和其他 Visual Studio 命令文件可能因计算机而异。 不要使用另一台计算机中的文件替换已经丢失或损坏的 vcvarsall.bat 文件。 需要重新运行 Visual Studio 安装程序来替换丢失的文件。vcvarsall.bat 文件在不同的版本中也会有所不同。 如果安装了当前版本 Visual Studio 的计算机上也安装了 Visual Studio 的早期版本,则不要在同一命令提示符窗口中运行不同版本的 vcvarsall.bat 或其他 Visual Studio 命令文件。
vcvarsall.bat
是Windows下的批处理命令,如下脚本代码所示(不同版本的 Visual Studio会有所不同):
@if not "%VSCMD_DEBUG%" GEQ "3" echo off
@REM -------------------------------------------------------------------------
:parse_args
set __VCVARSALL_STORE=
set __VCVARSALL_WINSDK=
set __VCVARSALL_PARSE_ERROR=
set __VCVARSALL_TARGET_ARCH=
set __VCVARSALL_HOST_ARCH=
set __VCVARSALL_VER=
@REM Parse command line arguments. This implementation does not care about
@REM argument order.
if "%VSCMD_DEBUG%" GEQ "1" (
@echo [DEBUG:%~nx0] init with arguments '%*'
)
set __VCVARSALL_PARSE_ERROR=0
set "__VCVARSALL_ARGS_LIST=%*"
call :parse_loop
set __VCVARSALL_ARGS_LIST=
if "%VSCMD_DEBUG%" GEQ "1" (
@echo [DEBUG:%~nx0] Command line parse completed with values:
@echo [DEBUG:%~nx0] __VCVARSALL_TARGET_ARCH='%__VCVARSALL_TARGET_ARCH%'
@echo [DEBUG:%~nx0] __VCVARSALL_HOST_ARCH='%__VCVARSALL_HOST_ARCH%'
@echo [DEBUG:%~nx0] __VCVARSALL_WINSDK='%__VCVARSALL_WINSDK%'
@echo [DEBUG:%~nx0] __VCVARSALL_STORE='%__VCVARSALL_STORE%'
@echo [DEBUG:%~nx0] __VCVARSALL_HELP='%__VCVARSALL_HELP%'
@echo [DEBUG:%~nx0] __VCVARSALL_PARSE_ERROR='%__VCVARSALL_PARSE_ERROR%'
)
if "%__VCVARSALL_CLEAN_ENV%" NEQ "" goto :call_vsdevcmd
if "%__VCVARSALL_PARSE_ERROR%" NEQ "0" goto :usage_error
if "%__VCVARSALL_HELP%" NEQ "" goto :usage
@REM -------------------------------------------------------------------------
:check_platform
@REM This script is installed to ...\VC\Auxiliary\Build.
@REM vsdevcmd is installed to ...\Common7\Tools.
if not exist "%~dp0..\..\..\Common7\Tools\vsdevcmd.bat" goto missing
@REM Assemble the arguments to pass to vsdevcmd.bat
if "%__VCVARSALL_TARGET_ARCH%" == "" goto :usage_error
if "%__VCVARSALL_HOST_ARCH%" == "" goto :usage_error
set "__VCVARSALL_VSDEVCMD_ARGS=-arch=%__VCVARSALL_TARGET_ARCH% -host_arch=%__VCVARSALL_HOST_ARCH%"
if "%__VCVARSALL_WINSDK%" NEQ "" (
set "__VCVARSALL_VSDEVCMD_ARGS=%__VCVARSALL_VSDEVCMD_ARGS% -winsdk=%__VCVARSALL_WINSDK%"
)
if "%__VCVARSALL_STORE%" NEQ "" (
set "__VCVARSALL_VSDEVCMD_ARGS=%__VCVARSALL_VSDEVCMD_ARGS% -app_platform=UWP"
)
if "%__VCVARSALL_VER%" NEQ "" (
set "__VCVARSALL_VSDEVCMD_ARGS=%__VCVARSALL_VSDEVCMD_ARGS% -vcvars_ver=%__VCVARSALL_VER%"
)
if "%__VCVARSALL_SPECTRE%" NEQ "" (
set "__VCVARSALL_VSDEVCMD_ARGS=%__VCVARSALL_VSDEVCMD_ARGS% -vcvars_spectre_libs=%__VCVARSALL_SPECTRE%"
)
goto :call_vsdevcmd
@REM -------------------------------------------------------------------------
@REM Call vsdevcmd.bat to setup the command prompt environment
:call_vsdevcmd
@REM This temporary environment variable is used to control setting of VC++
@REM command prompt-specific environment variables that should not be set
@REM by the VS Developer Command prompt (specifically vsdevcmd\ext\vcvars.bat).
@REM The known case this effects is the Platform environment variable, which
@REM will override platform target for .NET builds.
set VSCMD_VCVARSALL_INIT=1
@REM Special handling for the /clean_env argument
if "%__VCVARSALL_CLEAN_ENV%" NEQ "" (
call "%~dp0..\..\..\Common7\Tools\vsdevcmd.bat" /clean_env
goto :end
)
call "%~dp0..\..\..\Common7\Tools\vsdevcmd.bat" %__VCVARSALL_VSDEVCMD_ARGS%
if "%ERRORLEVEL%"=="0" (
@REM Print the target command prompt architecture...
if "%__VCVARSALL_HOST_ARCH%" NEQ "%__VCVARSALL_TARGET_ARCH%" (
echo [%~nx0] Environment initialized for: '%__VCVARSALL_HOST_ARCH%_%__VCVARSALL_TARGET_ARCH%'
) else (
echo [%~nx0] Environment initialized for: '%__VCVARSALL_TARGET_ARCH%'
)
)
goto :end
:parse_loop
for /F "tokens=1,* delims= " %%a in ("%__VCVARSALL_ARGS_LIST%") do (
if "%VSCMD_DEBUG%" GEQ "2" (
@echo [DEBUG:%~nx0] inner argument {%%a}
)
call :parse_argument %%a
set "__VCVARSALL_ARGS_LIST=%%b"
goto :parse_loop
)
exit /B 0
:parse_argument
@REM called by :parse_loop and expects the arguments to either be:
@REM 1. a single argument in %1
@REM 2. an argument pair from the command line specified as '%1=%2'
set __local_ARG_FOUND=
@REM Architecture
if /I "%1"=="x86" (
set __VCVARSALL_TARGET_ARCH=x86
set __VCVARSALL_HOST_ARCH=x86
set __local_ARG_FOUND=1
)
if /I "%1"=="x86_amd64" (
set __VCVARSALL_TARGET_ARCH=x64
set __VCVARSALL_HOST_ARCH=x86
set __local_ARG_FOUND=1
)
if /I "%1"=="x86_x64" (
set __VCVARSALL_TARGET_ARCH=x64
set __VCVARSALL_HOST_ARCH=x86
set __local_ARG_FOUND=1
)
if /I "%1"=="x86_arm" (
set __VCVARSALL_TARGET_ARCH=arm
set __VCVARSALL_HOST_ARCH=x86
set __local_ARG_FOUND=1
)
if /I "%1"=="x86_arm64" (
set __VCVARSALL_TARGET_ARCH=arm64
set __VCVARSALL_HOST_ARCH=x86
set __local_ARG_FOUND=1
)
if /I "%1"=="amd64" (
set __VCVARSALL_TARGET_ARCH=x64
set __VCVARSALL_HOST_ARCH=x64
set __local_ARG_FOUND=1
)
if /I "%1"=="x64" (
set __VCVARSALL_TARGET_ARCH=x64
set __VCVARSALL_HOST_ARCH=x64
set __local_ARG_FOUND=1
)
if /I "%1"=="amd64_x86" (
set __VCVARSALL_TARGET_ARCH=x86
set __VCVARSALL_HOST_ARCH=x64
set __local_ARG_FOUND=1
)
if /I "%1"=="x64_x86" (
set __VCVARSALL_TARGET_ARCH=x86
set __VCVARSALL_HOST_ARCH=x64
set __local_ARG_FOUND=1
)
if /I "%1"=="amd64_arm" (
set __VCVARSALL_TARGET_ARCH=arm
set __VCVARSALL_HOST_ARCH=x64
set __local_ARG_FOUND=1
)
if /I "%1"=="x64_arm" (
set __VCVARSALL_TARGET_ARCH=arm
set __VCVARSALL_HOST_ARCH=x64
set __local_ARG_FOUND=1
)
if /I "%1"=="amd64_arm64" (
set __VCVARSALL_TARGET_ARCH=arm64
set __VCVARSALL_HOST_ARCH=x64
set __local_ARG_FOUND=1
)
if /I "%1"=="x64_arm64" (
set __VCVARSALL_TARGET_ARCH=arm64
set __VCVARSALL_HOST_ARCH=x64
set __local_ARG_FOUND=1
)
if /I "%1"=="-vcvars_ver" (
set "__VCVARSALL_VER=%2"
set __local_ARG_FOUND=1
)
if /I "%1"=="/vcvars_ver" (
set "__VCVARSALL_VER=%2"
set __local_ARG_FOUND=1
)
if /I "%1"=="--vcvars_ver" (
set "__vcvarsall_ver=%2"
set __local_ARG_FOUND=1
)
if /I "%1"=="-vcvars_spectre_libs" (
set "__VCVARSALL_SPECTRE=%2"
set __local_ARG_FOUND=1
)
if /I "%1"=="/vcvars_spectre_libs" (
set "__VCVARSALL_SPECTRE=%2"
set __local_ARG_FOUND=1
)
if /I "%1"=="--vcvars_spectre_libs" (
set "__vcvarsall_SPECTRE=%2"
set __local_ARG_FOUND=1
)
if /I "%1"=="help" (
set __VCVARSALL_HELP=1
set __local_ARG_FOUND=1
)
if /I "%1"=="/help" (
set __VCVARSALL_HELP=1
set __local_ARG_FOUND=1
)
if /I "%1"=="-help" (
set __VCVARSALL_HELP=1
set __local_ARG_FOUND=1
)
if /I "%1"=="/?" (
set __VCVARSALL_HELP=1
set __local_ARG_FOUND=1
)
if /I "%1"=="-?" (
set __VCVARSALL_HELP=1
set __local_ARG_FOUND=1
)
@REM -- /clean_env --
@REM Mostly used for internal testing to restore the state of
@REM the command line environment to its state prior to vcvarsall.bat
@REM being executed.
if /I "%1"=="/clean_env" (
set __VCVARSALL_CLEAN_ENV=/clean_env
set __local_ARG_FOUND=1
)
if /I "%1"=="-clean_env" (
set __VCVARSALL_CLEAN_ENV=/clean_env
set __local_ARG_FOUND=1
)
@REM Windows SDK Version
if /I "%1"=="8.1" (
set "__VCVARSALL_WINSDK=8.1"
set __local_ARG_FOUND=1
)
set __temp1=%1
if /I "%__temp1:~0,3%"=="10." (
set "__VCVARSALL_WINSDK=%1"
set __local_ARG_FOUND=1
)
set __temp1=
@REM Store/UWP
if /I "%1"=="store" (
set "__VCVARSALL_STORE=-app_platform=UWP"
set __local_ARG_FOUND=1
)
if /I "%1"=="uwp" (
set "__VCVARSALL_STORE=-app_platform=UWP"
set __local_ARG_FOUND=1
)
if "%__local_ARG_FOUND%" NEQ "1" (
set /A __VCVARSALL_PARSE_ERROR=__VCVARSALL_PARSE_ERROR+1
if "%2"=="" (
@echo [ERROR:%~nx0] Invalid argument found : %1
) else (
@echo [ERROR:%~nx0] Invalid argument found : %1=%2
)
)
set __local_ARG_FOUND=
exit /B 0
:usage_error
echo [ERROR:%~nx0] Error in script usage. The correct usage is:
goto :usage
:usage
echo Syntax:
echo %~nx0 [arch] [platform_type] [winsdk_version] [-vcvars_ver=vc_version] [-vcvars_spectre_libs=spectre_mode]
echo where :
echo [arch]: x86 ^| amd64 ^| x86_amd64 ^| x86_arm ^| x86_arm64 ^| amd64_x86 ^| amd64_arm ^| amd64_arm64
echo [platform_type]: {empty} ^| store ^| uwp
echo [winsdk_version] : full Windows 10 SDK number (e.g. 10.0.10240.0) or "8.1" to use the Windows 8.1 SDK.
echo [vc_version] : {none} for latest installed VC++ compiler toolset ^|
echo "14.0" for VC++ 2015 Compiler Toolset ^|
echo "14.xx" for the latest 14.xx.yyyyy toolset installed (e.g. "14.11") ^|
echo "14.xx.yyyyy" for a specific full version number (e.g. "14.11.25503")
echo [spectre_mode] : {none} for libraries without spectre mitigations ^|
echo "spectre" for libraries with spectre mitigations
echo:
echo The store parameter sets environment variables to support Universal Windows Platform application
echo development and is an alias for 'uwp'.
echo:
echo For example:
echo %~nx0 x86_amd64
echo %~nx0 x86_amd64 10.0.10240.0
echo %~nx0 x86_arm uwp 10.0.10240.0
echo %~nx0 x86_arm onecore 10.0.10240.0 -vcvars_ver=14.0
echo %~nx0 x64 8.1
echo %~nx0 x64 store 8.1
echo:
echo Please make sure either Visual Studio or C++ Build SKU is installed.
goto :end
:missing
echo The specified configuration type is missing. The tools for the
echo configuration might not be installed.
goto :end
:end
set __VCVARSALL_TARGET_ARCH=
set __VCVARSALL_HOST_ARCH=
set __VCVARSALL_STORE=
set __VCVARSALL_WINSDK=
set __VCVARSALL_PARSE_ERROR=
set __VCVARSALL_CLEAN_ENV=
set VSCMD_VCVARSALL_INIT=
set __VCVARSALL_VSDEVCMD_ARGS=
set __VCVARSALL_HELP=
set __VCVARSALL_VER=
set __VCVARSALL_SPECTRE=
QtCreator对MSVC编译套件的识别,是通过Visual Studio的命令文件vcvarsall.bat
来实现的。例如下图:
且每一种编译套件都会使用到该命令文件,然后将对应的参数传递给该批处理文件!
(注:小生安装了多个版本的Visual Studio,所以在QtCreator自动检测MSVC编译套件时识别到多种不同类型的编译套件)
上图中,每一项后面的括号中的内容,则代表了该种编译套件的运行宿主机和生成程序的目标平台。具体含义参见本文第二小节内容啦。例如:如果我们的平台是x86 32位宿主机,生成的代码同样需要运行在x86 32位的目标计算机上,故需要选择x86
的编译套件。其他编译套件以此类推!
也可以在Visual Studio中搭建Qt的开发环境,但是小生还是比较喜欢QtCreator,工具而已,喜欢就好!haha