We use ninja for building on Windows. Our toolchain file for the MSVC
compiler is really simple (this is for MSVC 18.0, 32 bits):
--- SNIP ---
set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SYSTEM_PROCESSOR "x86")
set(CMAKE_SYSTEM_VERSION 1)
# Microsoft MSVC compiler
set(CMAKE_C_COMPILER cl.exe)
set(CMAKE_CXX_COMPILER cl.exe)
# Unfortunatly CMake doesn't seem to know anything about the MSVC compiler,
# so tell CMake that cl.exe supports C99
set(CMAKE_C_COMPILE_FEATURES c_std_99)
# If Visual Studio is selected as generator, only allow VS 2013
if(CMAKE_GENERATOR MATCHES "Visual Studio")
if(NOT CMAKE_GENERATOR MATCHES "Visual Studio 12 2013")
message(FATAL_ERROR "Visual Studio generator requires Visual Studio
12 2013"
" for this configuration")
else()
# Enable parallel builds for Visual Studio Projects with the /MP flag
set(_MP_FLAG "/MP")
endif()
endif()
set(CMAKE_C_FLAGS_INIT "/arch:SSE2 ${_MP_FLAG} /EHsc")
set(CMAKE_CXX_FLAGS_INIT "/arch:SSE2 ${_MP_FLAG}")
--- SNIP ---
However, there is a major snag (naturally, since we're talking about
Windows here) - in order for the Microsoft compiler to work from the
command line, you need to set the correct environment, and CMake doesn't
really give you a good way to do this. You can set environment variables
from CMake, but as the documentation says "This command affects only the
current CMake process, not the process from which CMake was called, nor
the system environment at large, nor the environment of subsequent build
or test processes.".
The solution we use is instead of calling cmake directly, we call a Perl
script that sets up the environment correctly and then calls cmake for
configuration or building. An alternative solution would be to write a
batch script wrapper for cl.exe, something like.
@ECHO OFF
"C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x86
cl.exe %*
and then set this batch script as the C and C++ compiler in CMake (note
that this is untested - I think it should work, but it may need some
extra work).
With kind regards,
Eric
Am 17.09.19 um 21:46 schrieb fdk17:
As I recall for myself, simply using the Visual Studio Generator with
the -A option was all that was needed to build for Win32.
You don't need a toolchain file because the generator already knows
how to setup a Visual Studio Project to target Win32.
Even the documentation for cross-compiling doesn't show a need to
setup toolchain file for cross compiling in this case.
I personally never seen anyone try to use the Ninja generator via
command line CMake and use the cl.exe compiler.
I've only seen that using Visual Studio to open a CMakeLists.txt file
it can produce a Ninja project. But even MS documentation states that
it doesn't always work.
https://stackoverflow.com/questions/31262342/cmake-g-ninja-on-windows-specify-x64
This says you should be able to open the proper development window and
use Ninja.
The output shows that in the environment you are using it doesn't even
know how to use cl.exe to even determine with compiler it is. Maybe
not all the proper environment variables and paths are being set
correctly when using the compiler.
--
F
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