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Summary: This is the latest in the 'findPtr' saga. See * 900c47f8 * 561748cb for the previous attempts. The problem with re-using the 'debug' cabal flag for the purpose of forcing inclusion of 'findPtr' occurs when 'debug' is one of the RTS ways, but RTS is not being compiled with '-DDEBUG': * the 'debug' flag gets passed to cabal, signalling to build 'rts' with the debug flavour, but also forcing inclusion of the 'findPtr'/'_findPtr' symbol * since '-DDEBUG' isn't enabled, that symbol doesn't show up in the libraries, so executable that depend on 'rts' (everything) will end up always requiring 'findPtr'/'_findPtr' but 'rts' won'y provide it! The fix is simple: create a a new 'find-ptr' cabal-flag whose only purpose is forcing '-Wl,-u,findPtr'/'-Wl,-u,_findPtr'. Then, enable that flag when the RTS is being compiled with '-DDEBUG' Test Plan: ./hadrian/build.sh -c # on mac Reviewers: alpmestan, snowleopard, bgamari, erikd, simonmar, Phyx Reviewed By: alpmestan, snowleopard, Phyx Subscribers: Phyx, rwbarton, carter GHC Trac Issues: #15956 Differential Revision: https://phabricator.haskell.org/D5404
924026e0