Is it possible to build Chromium with cl compiler?

[aari...@gmail.com]

I successfully built Chromium with the default settings on Windows. I see clang-cl was used to compile source files. When I tried to use "is_clang=false" gn argument, build failed because of many -Wno-unused-const-variable or -Wno-unused-function compiler options which cl doesn't understand, and I believe there are many other such options. These options are added unconditionally in many gn build files.

Is building with Microsoft's cl compiler supported now? I couldn't find any info now, but I remember years ago that was possible. Some old posts hint that actually was.

[Nico Weber]

It's not supported. There's supposed to be an error message along the lines of "this is not supported" if you try.

On Thu, Dec 22, 2022, 4:31 AM aari...@gmail.com <aari...@gmail.com> wrote:

I successfully built Chromium with the default settings on Windows. I see clang-cl was used to compile source files. When I tried to use "is_clang=false" gn argument, build failed because of many -Wno-unused-const-variable or -Wno-unused-function compiler options which cl doesn't understand, and I believe there are many other such options. These options are added unconditionally in many gn build files.

Is building with Microsoft's cl compiler supported now? I couldn't find any info now, but I remember years ago that was possible. Some old posts hint that actually was.

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[aari...@gmail.com]

Thank you, noted.

As for the error messages, there are no "not supported" errors, neither while generating a project nor while building it.

"gn gen" finishes just fine:

path>gn gen --ide=vs out\VS --args="is_clang=false"
Generating Visual Studio projects took 24161ms

Done. Made 18504 targets from 3196 files in 50632ms

And build fails because of compiler options:

path>autoninja -C out\VS chrome

...

[162/56098] CXX obj/skia/skia_opts_avx/SkOpts_avx.obj
FAILED: obj/skia/skia_opts_avx/SkOpts_avx.obj

...

cl : Command line warning D9025 : overriding '/std:c++17' with '/std:c++20'
cl : Command line error D8021 : invalid numeric argument '/Wno-c++17-extensions'

[163/56098] CXX obj/skia/skia_opts_sse3/SkOpts_ssse3.obj
FAILED: obj/skia/skia_opts_sse3/SkOpts_ssse3.obj

...

cl : Command line warning D9025 : overriding '/std:c++17' with '/std:c++20'
cl : Command line error D8021 : invalid numeric argument '/Wno-c++17-extensions'

[Nico Weber]

This error is supposed to fire: https://source.chromium.org/chromium/chromium/src/+/main:base/compiler_specific.h;l=11?q=Compiler.specific&ss=chromium

We should probably add a gn time assert as well, thanks for the suggestion.