friss added inline comments.

================
Comment at: lldb/packages/Python/lldbsuite/test/make/Makefile.rules:316
 
-# Use a shared module cache when building in the default test build directory.
-CLANG_MODULE_CACHE_DIR := $(shell echo "$(BUILDDIR)" | sed 
$(QUOTE)s/lldb-test-build.noindex.*/lldb-test-build.noindex\/module-cache-clang/$(QUOTE))
----------------
labath wrote:
> JDevlieghere wrote:
> > We should have a fallback here that defaults to `$(BUILDDIR)/module-cache` 
> > if the variable is not set in the environment.
> Is that wise, given D68731 tries to move away from autodetecting stuff in 
> `make`?
> 
> What I think would be more useful is to pass this variable via the command 
> like instead of the environment. That way it will be visible in the `make` 
> invocation that dotest prints and the exact make invocation can be reproduced 
> by copy-pasting. It shouldn't be even hard to do that -- you'd just need 
> builder_base.py to fetch this from the `configuration` object and inject it 
> into the make arguments.
+1

We shouldn't pass anything in the environment, it makes reproducing build 
failures a pain. (other variables I think are in the same bucket: DSYMUTIL and 
SDKROOT) 


Repository:
  rLLDB LLDB

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D68755/new/

https://reviews.llvm.org/D68755



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