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Summary

Hadrian merge objects is using target linker when merging object on stage0 which is wrong as it should use system linker (host linker).

Steps to reproduce

On x64/linux:

./configure --target=i686-unknown-linux-gnu # assuming cross tools are installed and in the path ./hadrian/build --flavour=quick-cross -V

Error:

| Run MergeObjects Stage0: _build/stage0/libraries/ghc-boot-th/build/GHC/LanguageExtensions/Type.o (and 2 more) => _build/stage0/libraries/ghc-boot-th/build/HSghc-boot-th-9.1.0.20201002.o
/export/home/karel/sfw/x-tools/i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-ld -r -o _build/stage0/libraries/ghc-boot-th/build/HSghc-boot-th-9.1.0.20201002.o _build/stage0/libraries/ghc-boot-th/build/GHC/LanguageExtensions/Type.o _build/stage0/libraries/ghc-boot-th/build/GHC/ForeignSrcLang/Type.o _build/stage0/libraries/ghc-boot-th/build/GHC/Lexeme.o
/export/home/karel/sfw/x-tools/i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-ld: relocatable linking with relocations from format elf64-x86-64 (_build/stage0/libraries/ghc-boot-th/build/GHC/LanguageExtensions/Type.o) to format elf32-i386 (_build/stage0/libraries/ghc-boot-th/build/HSghc-boot-th-9.1.0.20201002.o) is not supported
Error when running Shake build system:
  at action, called at src/Rules.hs:40:19 in main:Rules
  at need, called at src/Rules.hs:62:5 in main:Rules
* Depends on: _build/stage0/lib/package.conf.d/template-haskell-2.17.0.0.conf
  at apply1, called at src/Development/Shake/Internal/Rules/Oracle.hs:159:32 in shake-0.19.1-6a97e69d0545d3ba1eb59903d23e00e0d9c4b6d3edc79eb4573a53c7e0697438:Development.Shake.Internal.Rules.Oracle
* Depends on: OracleQ (ContextDataKey (Context {stage = Stage0, package = Package {pkgType = Library, pkgName = "template-haskell", pkgPath = "libraries/template-haskell"}, way = v}))
  at need, called at src/Hadrian/Oracles/Cabal/Rules.hs:54:9 in main:Hadrian.Oracles.Cabal.Rules
* Depends on: _build/stage0/libraries/template-haskell/setup-config
  at need, called at src/Rules/Library.hs:157:18 in main:Rules.Library
* Depends on: _build/stage0/libraries/ghc-boot-th/build/HSghc-boot-th-9.1.0.20201002.o
  at cmd', called at src/Builder.hs:293:23 in main:Builder
  at cmd, called at src/Builder.hs:380:8 in main:Builder
* Raised the exception:
Development.Shake.cmd, system command failed
Command line: /export/home/karel/sfw/x-tools/i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-ld -r -o _build/stage0/libraries/ghc-boot-th/build/HSghc-boot-th-9.1.0.20201002.o _build/stage0/libraries/ghc-boot-th/build/GHC/LanguageExtensions/Type.o _build/stage0/libraries/ghc-boot-th/build/GHC/ForeignSrcLang/Type.o _build/stage0/libraries/ghc-boot-th/build/GHC/Lexeme.o
Exit code: 1
Stderr and Stdout:
/export/home/karel/sfw/x-tools/i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-ld: relocatable linking with relocations from format elf64-x86-64 (_build/stage0/libraries/ghc-boot-th/build/GHC/LanguageExtensions/Type.o) to format elf32-i386 (_build/stage0/libraries/ghc-boot-th/build/HSghc-boot-th-9.1.0.20201002.o) is not supported

Expected behavior

For stage0 we need to use hosts' tools.

Environment

• GHC version used:

Optional:

• Operating System:
• System Architecture: