build failure - odd compiler selection

Christopher Jones jonesc at
Mon Aug 5 17:46:33 UTC 2019

Hi All,

Just trying to understand the build failure in <>

port in question <>

has the compiler selection

compiler.blacklist-append {clang < 920} macports-clang-3.* macports-clang-4.0 \
compiler.fallback-append macports-clang-8.0 macports-clang-7.0 macports-clang-6.0

build generates

--->  Configuring folly
Warning: All compilers are either blacklisted or unavailable; defaulting to first fallback option
DEBUG: Preferred compilers: clang macports-clang-3.4 macports-llvm-gcc-4.2 apple-gcc-4.2 macports-clang-8.0 macports-clang-7.0 macports-clang-6.0
DEBUG: Using compiler 'Xcode Clang’
-- The CXX compiler identification is AppleClang
-- The C compiler identification is AppleClang
why is Xcode clang being selected, when it is already blacklisted ? Do the blacklist settings not get applied to the fallback list ?

cheers Chris
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