Hi Simon,

What happens when you try to compile that simple test with the bundled gcc?

Could you also run it through strace, this will force msys2 not to swallow errors from the OS.

Should you get an exception dialog then rm -rf inplace/mingw and rerun configure (I assume you’re on a recent revision).

If none of the above give a clue, you could try ./configure --enable-distro-toolchain, this will have it skip the bundled GCC

And use any installed by msys2. If this work then try rm’ing the GHC-tarballs folder and the inplace/mingw folder and try again

With –enable-tarballs-autodownloads.

Tamar.

From: Simon Peyton Jones via ghc-devs
Sent: Thursday, June 29, 2017 00:35
To: ghc-devs
Subject: Windows broken

Help please!

Suddenly my Windows build has stopped working.   See below.  What should I do?  I’m totally stuck.

This has never happened before.

I get this:

GHC path canonicalised to: c:/fp/ghc-8.0.2/bin/ghc

checking build system type... x86_64-pc-msys

checking host system type... x86_64-pc-msys

checking target system type... x86_64-pc-msys

Build platform inferred as: x86_64-unknown-mingw32

Host platform inferred as: x86_64-unknown-mingw32

Target platform inferred as: x86_64-unknown-mingw32

GHC build  : x86_64-unknown-mingw32

GHC host   : x86_64-unknown-mingw32

GHC target : x86_64-unknown-mingw32

LLVM target: x86_64-unknown-mingw32

checking for path to top of build tree... C:/code/HEAD

configure: Checking for Windows toolchain tarballs...

configure: Extracting Windows toolchain from archives (may take a while)...

configure: In-tree MingW-w64 tree created

configure: Making in-tree perl tree

configure: In-tree perl tree created

checking whether the C compiler works... no

configure: error: in `/c/code/HEAD':

configure: error: C compiler cannot create executables

See `config.log' for more details

Something wrong with the gcc.exe?  Config.log has this

gcc version 6.3.0 (Rev2, Built by MSYS2 project)

configure:4950: $? = 0

configure:4939: C:/code/HEAD/inplace/mingw/bin/gcc.exe -V >&5

gcc.exe: error: unrecognized command line option '-V'

gcc.exe: fatal error: no input files

compilation terminated.

configure:4950: $? = 1

configure:4939: C:/code/HEAD/inplace/mingw/bin/gcc.exe -qversion >&5

gcc.exe: error: unrecognized command line option '-qversion'; did you mean '--version'?

gcc.exe: fatal error: no input files

compilation terminated.

configure:4950: $? = 1

configure:4970: checking whether the C compiler works

configure:4992: C:/code/HEAD/inplace/mingw/bin/gcc.exe    conftest.c  >&5

configure:4996: $? = 1

configure:5034: result: no

configure: failed program was:

| /* confdefs.h */

| #define PACKAGE_NAME "The Glorious Glasgow Haskell Compilation System"

| #define PACKAGE_TARNAME "ghc-8.3"

| #define PACKAGE_VERSION "8.3"

| #define PACKAGE_STRING "The Glorious Glasgow Haskell Compilation System 8.3"

| #define PACKAGE_BUGREPORT "glasgow-haskell-bugs@haskell.org"

| #define PACKAGE_URL ""

| /* end confdefs.h.  */

|

| int

| main ()

| {

|

|   ;

|   return 0;

| }

configure:5039: error: in `/c/code/HEAD':

configure:5041: error: C compiler cannot create executables