[-Zbuild-std] Only build libtest when libstd is built #7360
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Currently
libtest
is always compiled when a compilation unit uses a test harness. This implicitly adds builds the standard library too becauselibtest
depends on it. This breaks the use of custom test frameworks inno_std
crates as reported in #7216 (comment).This pull request fixes the issue by only building
libtest
iflibstd
is built. This makes sense in my opinion because when the user explicitly specified-Zbuild-std=core
, they probably don't want to build the full standard library and rather get a compilation error when they accidentally uselibtest
.