Thanks for pointing this out, Simon

What you’ve pasted is the trace of the ghc-toolchain program.

We should probably lower the verbosity after !10976 lands, but in the meantime it’s just useful to debug mostly CI.

At the end of the configure step there might be a message that starts with “Don’t worry! This will not affect your build in any way”. That’s as less alarming as I could make it :).

If you do see the warning, it’s due to a discrepancy between the output produced by configure and the one produced by ghc-toolchain:

We’re fixing all the discrepancies caught by CI in !10976 — after which we’ll always validate these discrepancies in CI, to ensure ghc-toolchain is kept up to date with configure, while configure still configures toolchains.

I’ve also been busy writing the blog about this. It should come out soon enough.

Rodrigo

On 7 Aug 2023, at 10:50, Simon Peyton Jones <simon.peytonjones@gmail.com> wrote:

Rodrigo

I'm getting lots of errors from ./configure, see below.

Seems to be something to do with your toolchain stuff?  I'm lost.  Should I worry? If not, could they be made to look less alarming somehow?

Simon

Entering: checking for C compiler
  checking for -Qunused-arguments support...
  Entering: checking for -Qunused-arguments support
    Execute: /usr/bin/gcc -Qunused-arguments -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.c
    Command failed: /usr/bin/gcc -Qunused-arguments -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.c
Exited with code 1

  found for -Qunused-arguments support: Cc {ccProgram = Program {prgPath = "/usr/bin/gcc", prgFlags = []}}
  checking whether Cc supports --target...
  Entering: checking whether Cc supports --target
    Execute: /usr/bin/gcc -Werror --target=x86_64-unknown-linux -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.c
    Command failed: /usr/bin/gcc -Werror --target=x86_64-unknown-linux -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.c
Exited with code 1

  found whether Cc supports --target: Cc {ccProgram = Program {prgPath = "/usr/bin/gcc", prgFlags = []}}
  checking whether Cc works...
  Entering: checking whether Cc works
    Execute: /usr/bin/gcc -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.c
  found whether Cc works: ()
  checking for C99 support...
  Entering: checking for C99 support
    Execute: /usr/bin/gcc -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.c
  found for C99 support: ()
  checking whether cc supports extra via-c flags...
  Entering: checking whether cc supports extra via-c flags
    Execute: /usr/bin/gcc -c -fwrapv -fno-builtin -Werror -x c -o /tmp/tmp0/test.o /tmp/tmp0/test.c
  found whether cc supports extra via-c flags: ()
found for C compiler: Cc {ccProgram = Program {prgPath = "/usr/bin/gcc", prgFlags = []}}
checking for C++ compiler...
Entering: checking for C++ compiler
  x86_64-unknown-linux-g++ not found in search path
  x86_64-unknown-linux-clang++ not found in search path
  x86_64-unknown-linux-c++ not found in search path
  checking whether C++ supports --target...
  Entering: checking whether C++ supports --target
    Execute: /usr/bin/g++ -Werror --target=x86_64-unknown-linux -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.cpp
    Command failed: /usr/bin/g++ -Werror --target=x86_64-unknown-linux -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.cpp
Exited with code 1

  found whether C++ supports --target: Cxx {cxxProgram = Program {prgPath = "/usr/bin/g++", prgFlags = []}}
  Execute: /usr/bin/g++ -c -o /tmp/tmp0/test.o /tmp/tmp0/test.o.cpp
found for C++ compiler: Cxx {cxxProgram = Program {prgPath = "/usr/bin/g++", prgFlags = []}}
checking for C preprocessor...