rustc: Don't use jemalloc when crossing to MSVC #28668
Merged
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This commit updates the compiler to not attempt to use jemalloc for platforms
where jemalloc is never enabled. Currently the compiler attempts to link in
jemalloc based on whether
--disable-jemalloc
was specified at build time forthe compiler itself, but this is only the right decision for the host target,
not for other targets.
This still leaves a hole open where a set of target libraries are downloaded
which were built with
--disable-jemalloc
and the compiler is unaware of that,but this is a pretty rare case so it can always be fixed later.