GNU bug report logs - #75939
bug in compile wrapper when using MSVC from Msys2

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Karl Berry <karl <at> freefriends.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#75939: closed (bug in compile wrapper when using MSVC from Msys2)
Date: Mon, 03 Feb 2025 22:21:02 +0000

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Your message dated Mon, 3 Feb 2025 23:20:02 +0100
with message-id <202502032220.513MK2O02764395 <at> tug.org>
and subject line Re: bug#75939: setting $MSYS2_ARG_CONV_EXCL in compile script?
has caused the debbugs.gnu.org bug report #75939,
regarding bug in compile wrapper when using MSVC from Msys2
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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75939: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=75939
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From: Kirill Makurin <maiddaisuki <at> outlook.com>
To: "bug-automake <at> gnu.org" <bug-automake <at> gnu.org>
Subject: bug in compile wrapper when using MSVC from Msys2
Date: Wed, 29 Jan 2025 23:09:40 +0000

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Hi,

I would like to report one quite annoying issue related to Automake's `compile` wrapper when it is used with `cl.exe` to compile some C++ files from Msys2.

I was building some GNU packages with MSVC's `cl.exe`, and compilation of some C++ source files was failing with `cl.exe` reporting non-sensual filenames like `H:E:/Msys2/{builddir}/somefile.cxx`.

Apparently, the issue is double conversion of a unix-style filename by Msys2's shell. In example above, Msys2 is installed to `E:/Msys2` and builddir is `/h/{builddir}`.

As I figured out later, it was happening because `compile` was converting `/h/{builddir}/somefile.cxx` to `H:/{builddir}/somefile.cxx` and passing it as `-TpH:/{builddir}/somefile.cxx` to `cl.exe`. However, Msys2 was interpreting `/{builddir}/somefile.cxx` as a unix-style path and converted it again, resulting in `-TpH:E:/Msys2/{builddir}/somefile.cxx`.

One way to work around this issue is :

```
export MSYS2_ARG_CONV_EXCL='-Tp'
```

However, this must be set by the user, which is inconvenient. I wonder if anything can be done in the `compile` wrapper to fix this.

I am using latest versions of MSVC tools and `cl.exe` allows to pass argument to `-Tp` as a separate argument and this seems to work correctly. However, I don't know whether older versions of `cl.exe` allow it.

- Kirill Makurin

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From: Karl Berry <karl <at> freefriends.org>
To: bruno <at> clisp.org, maiddaisuki <at> outlook.com, 75939 <at> debbugs.gnu.org
Subject: Re: bug#75939: setting $MSYS2_ARG_CONV_EXCL in compile script?
Date: Mon, 3 Feb 2025 23:20:02 +0100

    the three patches from the preceding mail are ready to commit.

Thanks very much for all your work (and explanations) on this, Bruno.
Committed. -k

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