Bug 1618758 Comment 14 Edit History

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Why do you persists in building the outdated esr52 tree? It is no longer supported and Bugzilla would be not an appropriate place to ask the question about unsupported branches.

FWIW,
1. The esr52 branch would not work with VS2019. Even VS2017 was not supported [until Firefox 55](https://bugzilla.mozilla.org/show_bug.cgi?id=1318143).
2. Clang-cl support is [even newer](https://bugzilla.mozilla.org/show_bug.cgi?id=1443590). So `./mach bootstrap` won't care about installing clang-cl at all on the esr52 branch.
3. You will have to install an old MozillaBuild and run one of `start-shell-msvc*.bat`, I guess.
Why do you persist in building the outdated esr52 tree? It is no longer supported and Bugzilla would be not an appropriate place to ask the question about unsupported branches.

FWIW,
1. The esr52 branch would not work with VS2019. Even VS2017 was not supported [until Firefox 55](https://bugzilla.mozilla.org/show_bug.cgi?id=1318143).
2. Clang-cl support is [even newer](https://bugzilla.mozilla.org/show_bug.cgi?id=1443590). So `./mach bootstrap` won't care about installing clang-cl at all on the esr52 branch.
3. You will have to install an old MozillaBuild and run one of `start-shell-msvc*.bat`, I guess.

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