Currently attempting to build GHC on FreeBSD 13 against the `iconv` implementation provided by `libc` produces a broken compiler. Specifically (as of 87d93745fa14344a26ab242fd5db35e654e1da48): ``` $ ./configure --with-gmp-includes=/usr/local/include --with-gmp-libraries=/usr/local/lib $ hadrian/build-cabal -j9 $ hadrian/build-cabal -j9 test ... SUMMARY for test run started at Fri Sep 10 00:11:32 2021 0:24:26.976783 spent to go through 8445 total tests, which gave rise to 42361 test cases, of which 29940 were skipped 45 had missing libraries 8457 expected passes 109 expected failures 0 caused framework failures 0 caused framework warnings 0 unexpected passes 407 unexpected failures 0 unexpected stat failures 25 fragile tests ``` Specifically, the failures are all RTS linker failures of the form: ``` GHC.ByteCode.Linker.lookupCE During interactive linking, GHCi couldn't find the following symbol: templatezmhaskell_LanguageziHaskellziTHziSyntax_mkName_closure This may be due to you not asking GHCi to load extra object files, archives or DLLs needed by your current session. Restart GHCi, specifying the missing library using the -L/path/to/object/dir and -lmissinglibname flags, or simply by naming the relevant files on the GHCi command line. Alternatively, this link failure might indicate a bug in GHCi. If you suspect the latter, please report this as a GHC bug: https://www.haskell.org/ghc/reportabug Compile failed (exit code 1) errors were: ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `iconv_open' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `hs_iconv' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziIOziEncodingziIconv_iconvEncoding2_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziIOziEncoding_getForeignEncoding_closure' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_ForeignziCziError_throwErrnoIfMinus1zu1_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `ghczuwrapperZC20ZCbaseZCSystemziPosixziInternalsZCwrite' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziIOziHandleziInternals_zdwreadTextDevice_closure' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziIOziHandleziText_zdwhGetBuf_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziFingerprint_fingerprintString_closure' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_DataziTypeableziInternal_zdwmkTrCon_closure' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziExceptionziType_underflowException_closure' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziReal_zczuzdszc_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_TextziReadziLex_expect2_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_DataziEither_Left_con_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_ControlziExceptionziBase_patError_closure' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziList_zdwznzn_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziShow_zdwitos_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziException_errorCallWithCallStackException1_info' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziIOziException_zdfxExceptionIOException_closure' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/base-4.16.0.0/libHSbase-4.16.0.0.a: unknown symbol `base_GHCziIO_mplusIO_closure' ghc-iserv: /usr/home/vagrant/ghc/_build/stage1/lib/x86_64-freebsd-ghc-9.3.20210908/template-haskell-2.18.0.0/libHStemplate-haskell-2.18.0.0.a: unknown symbol `base_GHCziBase_zpzp_info' ghc-iserv: ^^ Could not load 'templatezmhaskell_LanguageziHaskellziTHziSyntax_zdfApplicativeQ6_closure', dependency unresolved. See top entry above. ```