Hello all, being among those unfortunate enough to have updated Visual Studio before realizing that the most recent version cannot be used to build Firefox, I was faced with the prospect of reinstalling the whole monstrosity - which takes forever - or finding a workaround. As it turns out I found a clunky yet simple one:
- Launch the Visual Studio Installer, the click on the "modify" button - Go into the "Individual components" and select the "VC++ 2017 version 15.6 v14.13 toolset" component - Launch the installation - Modify build/moz.configure/toolchain.configure by manually setting the tools_version string in [1] to the value '14.13.26128' - You're done! Both a clang-cl and a msvc should now pick up the old tooling and work properly (provided you have the right Windows SDK). I couldn't find a way to override this via mozconfig options or environment variables but if there is a way to do this without modifying the sources I'd like to hear it. Gabriele [1] https://searchfox.org/mozilla-central/rev/5dbfd833bbb114afe758db4d4bdbc5b13bcc33ef/build/moz.configure/toolchain.configure#584
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