[llvm-bugs] [Bug 41354] New: Windows gn build should generate ninja files that don't require a vcvars environment

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41354

            Bug ID: 41354
           Summary: Windows gn build should generate ninja files that
                    don't require a vcvars environment
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: rnk at google.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    nicolasweber at gmx.de, phosek at chromium.org

I typically build from a vcvars shell, so this isn't usually a problem for me,
but today I was experimenting with `gn gen . --ide=vs`, which runs it's
external build commands from a "standard" environment. Without INCLUDE, LIB,
LIBPATH, and PATH for mt.exe and some others, the in-IDE ninja build fails
while a build from the right environment will succeed.

It would be nice if we set up the gn build like Chromium has it to write out
environment block files for use with ninja -t msvc, or use -imsvc if clang-cl
is in use.

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