[lld] Static linking fails when using GHC musl images with `gmp` big-integer implementation plus `ld.lld` as default linker

[benz0li]

Your environment

Which OS do you use? Alpine Linux 3.22.0

Which version of LLVM do you use and how do you install it? Version 20. Using apk.

Preparation

git clone https://github.com/benz0li/ghc-musl.git
cd ghc-musl
git checkout 361466df797552946aeece4d4e0d618203821b75

Build GHC musl

docker build \
  --progress plain \
  --target test \
  -t ghc-musl:9.10.2 \
  -f dockerfiles/9.10.2.Dockerfile .

Expected behaviour

Build succeeds. Test (static linking) succeeds.

Actual behaviour

Build succeeds. Test (static linking) fails.

Cross references:

• [lld] Not creating fully statically linked binaries on Alpine Linux #137510 (comment)
• ld.lld (the LLVM linker) is missing in the images benz0li/ghc-musl#13 (comment)

Output (excerpt):

#17 [test 1/4] WORKDIR /usr/local/src
#17 DONE 0.0s

#18 [test 2/4] COPY --from=ghc-stage2 /root/.local/bin/cabal /usr/local/bin/cabal
#18 DONE 0.5s

#19 [test 3/4] COPY Main.hs Main.hs
#19 DONE 0.0s

#20 [test 4/4] RUN ghc -static -optl-pthread -optl-static Main.hs   && file Main   && ./Main   && mkdir cabal-test   && cd cabal-test   && cabal update   && cabal init -n --is-executable -p tester -l MIT   && cabal run
#20 0.249 [1 of 2] Compiling Main             ( Main.hs, Main.o )
#20 0.333 [2 of 2] Linking Main
#20 0.677 ld.lld: error: undefined symbol: __gmpn_add_1
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzuaddzu1_slow$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzuaddzu1_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_bignatzuaddzuword_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 1 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpn_sub_1
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzusubzu1_slow$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzusubzu1_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_bignatzusubzuword_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 1 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpn_add
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzuadd_slow$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzuadd_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_bignatzuadd_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 2 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpn_sub
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzusub_slow$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzusub_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_bignatzusub_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 2 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpn_mul
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzumul_slow$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzumul_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_bignatzumul_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 1 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpn_cmp
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzucmp_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_bignatzucompare_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by BigNat.o:(ghczmbignum_GHCziNumziBigNat_bigNatEqzh_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 27 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpn_tdiv_qr
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzutdivzuqr_slow$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzutdivzuqr_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_bignatzuquotrem_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 5 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpn_mod_1
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_czumpnzumodzu1_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by GMP.o:(ghczmbignum_GHCziNumziBackendziGMP_bignatzuremzuword_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by BigNat.o:(ghczmbignum_GHCziNumziBigNat_bigNatRemWordzh_info$def) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 5 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpz_get_d
#20 0.677 >>> referenced by gmp_wrappers.o:(integer_gmp_mpn_get_d) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpz_get_d_2exp
#20 0.677 >>> referenced by gmp_wrappers.o:(integer_gmp_mpn_get_d) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpn_gcd_1
#20 0.677 >>> referenced by gmp_wrappers.o:(integer_gmp_gcd_word) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by gmp_wrappers.o:(integer_gmp_mpn_gcd_1) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpz_init
#20 0.677 >>> referenced by gmp_wrappers.o:(integer_gmp_mpn_gcd) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by gmp_wrappers.o:(integer_gmp_gcdext) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced by gmp_wrappers.o:(integer_gmp_gcdext) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.677 >>> referenced 8 more times
#20 0.677 
#20 0.677 ld.lld: error: undefined symbol: __gmpz_gcd
#20 0.678 >>> referenced by gmp_wrappers.o:(integer_gmp_mpn_gcd) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.678 
#20 0.678 ld.lld: error: undefined symbol: __gmpz_clear
#20 0.678 >>> referenced by gmp_wrappers.o:(integer_gmp_mpn_gcd) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.678 >>> referenced by gmp_wrappers.o:(integer_gmp_gcdext) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_gcdext) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 >>> referenced 8 more times
#20 0.679 
#20 0.679 ld.lld: error: undefined symbol: __gmpz_gcdext
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_gcdext) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 
#20 0.679 ld.lld: error: undefined symbol: __gmpz_sizeinbase
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_mpn_sizeinbase) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 
#20 0.679 ld.lld: error: undefined symbol: __gmpz_export
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_mpn_export) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 
#20 0.679 ld.lld: error: undefined symbol: __gmpz_probab_prime_p
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_test_prime) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 
#20 0.679 ld.lld: error: undefined symbol: __gmpz_nextprime
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_next_prime) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_next_prime1) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 
#20 0.679 ld.lld: error: undefined symbol: __gmpz_powm
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_powm) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 >>> referenced by gmp_wrappers.o:(integer_gmp_powm1) in archive /usr/local/lib/ghc-9.10.2/lib/../lib/aarch64-linux-ghc-9.10.2/ghc-bignum-1.3-inplace/libHSghc-bignum-1.3-inplace.a
#20 0.679 
#20 0.679 ld.lld: error: too many errors emitted, stopping now (use --error-limit=0 to see all errors)
#20 0.682 collect2: error: ld returned 1 exit status
#20 0.683 ghc-9.10.2: `gcc' failed in phase `Linker'. (Exit code: 1)
#20 0.683 HasCallStack backtrace:
#20 0.683   collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception
#20 0.683   toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/IO.hs:260:11 in ghc-internal:GHC.Internal.IO
#20 0.683   throwIO, called at libraries/exceptions/src/Control/Monad/Catch.hs:308:12 in exceptions-0.10.9-inplace:Control.Monad.Catch
#20 0.683   throwM, called at libraries/exceptions/src/Control/Monad/Catch.hs:797:84 in exceptions-0.10.9-inplace:Control.Monad.Catch
#20 0.683   onException, called at compiler/GHC/Driver/Make.hs:2983:23 in ghc-9.10.2-inplace:GHC.Driver.Make
#20 0.683 
#20 0.683 
#20 ERROR: process "/bin/sh -c ghc -static -optl-pthread -optl-static Main.hs   && file Main   && ./Main   && mkdir cabal-test   && cd cabal-test   && cabal update   && cabal init -n --is-executable -p tester -l MIT   && cabal run" did not complete successfully: exit code: 1

[benz0li]

It suceeds when using GHC musl images with native big-integer¹ backend plus ld.lld as default linker:

git clone https://github.com/benz0li/ghc-musl.git
cd ghc-musl
git checkout 7ce7b8f0bab49e9a6eea40cace86e44b194e5085

docker build \
  --progress plain \
  --target test \
  --build-arg GHC_NATIVE_BIGNUM=1 \
  -t ghc-musl:9.10.2 \
  -f dockerfiles/9.10.2.Dockerfile .

Footnotes

1. https://iohk.io/en/blog/posts/2020/07/28/improving-haskells-big-numbers-support ↩

[benz0li]

It also succeeds when using GHC musl images with gmp big-integer implementation plus ld.bfd (the GNU linker) as default linker.

git clone https://github.com/benz0li/ghc-musl.git
cd ghc-musl
git checkout 7ce7b8f0bab49e9a6eea40cace86e44b194e5085

docker build \
  --progress plain \
  --target test \
  -t ghc-musl:9.10.2 \
  -f dockerfiles/9.10.2.Dockerfile .

[benz0li]

Why does this work with ld.bfd (the GNU linker) but not with ld.lld (the LLVM linker)?

ld.lld --version states LLD 20.1.6 (compatible with GNU linkers).

[MaskRay]

Can you create a reproduce tarball and invoke both linkers with -y __gmpz_get_d to examine the symbol resolution behaviors?

https://maskray.me/blog/2022-02-27-analysis-and-introspection-options-in-linkers describes the instructions and -y.

clang -fuse-ld=lld -Wl,--reproduce=/tmp/rep.tar a.o b.o
LLD_REPRODUCE=/tmp/rep.tar clang -fuse-ld=lld a.o b.o

[benz0li]

Can you create a reproduce tarball and invoke both linkers with -y __gmpz_get_d to examine the symbol resolution behaviors?

To reproduce on a Linux/x86_64 machine with Docker (or Podman¹) installed:

docker run --rm -ti glcr.b-data.ch/ghc/ghc-musl:9.10.2-lld-linux-amd64-defunct bash

apk add nano

nano Main.hs

Main.hs:

module Main (main) where

main :: IO ()
main = putStrLn "Hello, World!"

Fails (default linker: ld.lld):

ghc -static -optl-pthread -optl-static Main.hs

Succeeds:

ghc -static -optl-pthread -optl-static -optl-fuse-ld=bfd Main.hs

Footnotes

1. podman run --rm -ti glcr.b-data.ch/ghc/ghc-musl:9.10.2-lld-linux-amd64-defunct bash ↩

[benz0li]

clang -fuse-ld=lld -Wl,--reproduce=/tmp/rep.tar Main.o

ld.lld: error: undefined symbol: newCAF
>>> referenced by Main.o:(Main_main_info)
>>> referenced by Main.o:(ZCMain_main_info)

ld.lld: error: undefined symbol: stg_bh_upd_frame_info
>>> referenced by Main.o:(Main_main_info)
>>> referenced by Main.o:(ZCMain_main_info)

ld.lld: error: undefined symbol: ghczminternal_GHCziInternalziSystemziIO_putStrLn_closure
>>> referenced by Main.o:(Main_main_info)
>>> referenced by Main.o:(.data+0x30)

ld.lld: error: undefined symbol: ghczminternal_GHCziInternalziTopHandler_runMainIO_closure
>>> referenced by Main.o:(ZCMain_main_info)
>>> referenced by Main.o:(.data+0x70)

ld.lld: error: undefined symbol: stg_ap_p_fast
>>> referenced by Main.o:(Main_main_info)
>>> referenced by Main.o:(ZCMain_main_info)

ld.lld: error: undefined symbol: stg_unpack_cstring_info
>>> referenced by Main.o:(.data+0x0)

ld.lld: error: undefined symbol: stg_SRT_2_info
>>> referenced by Main.o:(.data+0x28)
>>> referenced by Main.o:(.data+0x68)

ld.lld: error: undefined symbol: main
>>> referenced by crt1.c:18 (crt/crt1.c:18)
>>>               /usr/lib/Scrt1.o:(_start_c)

ld.lld: error: undefined symbol: ghczmprim_GHCziTypes_TrNameS_con_info
>>> referenced by Main.o:(.data+0xa8)
>>> referenced by Main.o:(.data+0xb8)

ld.lld: error: undefined symbol: ghczmprim_GHCziTypes_Module_con_info
>>> referenced by Main.o:(.data+0xc8)
clang: error: linker command failed with exit code 1 (use -v to see invocation)

rep.tar.gz

[benz0li]

ld.bfd -y __gmpz_get_d Main.o

ld.bfd: warning: cannot find entry symbol _start; defaulting to 0000000000401000
ld.bfd: Main.o: in function `Main_main_info':
(.text+0x29): undefined reference to `newCAF'
ld.bfd: (.text+0x3a): undefined reference to `stg_bh_upd_frame_info'
ld.bfd: (.text+0x4c): undefined reference to `ghczminternal_GHCziInternalziSystemziIO_putStrLn_closure'
ld.bfd: Main.o: in function `ZCMain_main_info':
(.text+0x91): undefined reference to `newCAF'
ld.bfd: (.text+0xa2): undefined reference to `stg_bh_upd_frame_info'
ld.bfd: (.text+0xb4): undefined reference to `ghczminternal_GHCziInternalziTopHandler_runMainIO_closure'
ld.bfd: Main.o: in function `Main_main_info':
(.text+0x55): undefined reference to `stg_ap_p_fast'
ld.bfd: Main.o: in function `ZCMain_main_info':
(.text+0xbd): undefined reference to `stg_ap_p_fast'
ld.bfd: Main.o:(.data+0x0): undefined reference to `stg_unpack_cstring_info'
ld.bfd: Main.o:(.data+0x28): undefined reference to `stg_SRT_2_info'
ld.bfd: Main.o:(.data+0x30): undefined reference to `ghczminternal_GHCziInternalziSystemziIO_putStrLn_closure'
ld.bfd: Main.o:(.data+0x68): undefined reference to `stg_SRT_2_info'
ld.bfd: Main.o:(.data+0x70): undefined reference to `ghczminternal_GHCziInternalziTopHandler_runMainIO_closure'
ld.bfd: Main.o:(.data+0xa8): undefined reference to `ghczmprim_GHCziTypes_TrNameS_con_info'
ld.bfd: Main.o:(.data+0xb8): undefined reference to `ghczmprim_GHCziTypes_TrNameS_con_info'
ld.bfd: Main.o:(.data+0xc8): undefined reference to `ghczmprim_GHCziTypes_Module_con_info'

[benz0li]

ld.lld -y __gmpz_get_d Main.o

ld.lld: error: undefined symbol: newCAF
>>> referenced by Main.o:(Main_main_info)
>>> referenced by Main.o:(ZCMain_main_info)

ld.lld: error: undefined symbol: stg_bh_upd_frame_info
>>> referenced by Main.o:(Main_main_info)
>>> referenced by Main.o:(ZCMain_main_info)

ld.lld: error: undefined symbol: ghczminternal_GHCziInternalziSystemziIO_putStrLn_closure
>>> referenced by Main.o:(Main_main_info)
>>> referenced by Main.o:(.data+0x30)

ld.lld: error: undefined symbol: ghczminternal_GHCziInternalziTopHandler_runMainIO_closure
>>> referenced by Main.o:(ZCMain_main_info)
>>> referenced by Main.o:(.data+0x70)

ld.lld: error: undefined symbol: stg_ap_p_fast
>>> referenced by Main.o:(Main_main_info)
>>> referenced by Main.o:(ZCMain_main_info)

ld.lld: error: undefined symbol: stg_unpack_cstring_info
>>> referenced by Main.o:(.data+0x0)

ld.lld: error: undefined symbol: stg_SRT_2_info
>>> referenced by Main.o:(.data+0x28)
>>> referenced by Main.o:(.data+0x68)

ld.lld: error: undefined symbol: ghczmprim_GHCziTypes_TrNameS_con_info
>>> referenced by Main.o:(.data+0xa8)
>>> referenced by Main.o:(.data+0xb8)

ld.lld: error: undefined symbol: ghczmprim_GHCziTypes_Module_con_info
>>> referenced by Main.o:(.data+0xc8)

[benz0li]

@MaskRay Do you require further information?