hey All, the current settings for warnings etc for ghc validate do not work
on mac,
this is because some gcc flag isn't in clang, or vice versa, or some
version of gcc related matter
the relevant error is:
error: unknown warning option '-Werror=unused-but-set-variable'; did you
mean '-Werror=unused-const-variable'? [-Werror,-Wunknown-warning-option]
the culprit seems to be apple clang, at least if my reading of the config
output by validate is correct
Configure completed successfully.
Building GHC version : 8.5.20171223
Git commit id : d7d0aa316f9d23d73ae617e0cc1b147907667ef4
Build platform : x86_64-apple-darwin
Host platform : x86_64-apple-darwin
Target platform : x86_64-apple-darwin
Bootstrapping using : /Users/carter/.install-ghc/ghc-8.2.2-hq/bin/ghc
which is version : 8.2.2
Using (for bootstrapping) : /usr/bin/clang
Using gcc : /usr/local/bin/gcc-7
which is version : 7.2.0
Building a cross compiler : NO
Unregisterised : NO
hs-cpp : /usr/local/bin/gcc-7
hs-cpp-flags : -E -undef -traditional
there seem to be several take aways:
1) clang doesn't support unused-but-set-variable
1.5) no one has run validate on OSX in the past few months with a vanilla
checkout / env?
2) how do i change the compiler selected for boot strapping, whether via
env variables or other twiddles
thanks!
-Carter
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