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Date: Thu, 4 Sep 2025 10:38:46 -0700 (PDT)
X-X-Sender: jeremyd AT resin DOT csoft DOT net
To: Thierry DECHAIZE <thierry DOT dechaize AT gmail DOT com>
cc: cygwin AT cygwin DOT com
Subject: Re: Strange behaviour with Resource Compiler og GCC (MinGW32/64)
 and LLVM
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Message-ID: <800bdaf6-6599-9708-904d-173245479113@jdrake.com>
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From: Jeremy Drake via Cygwin <cygwin AT cygwin DOT com>
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On Thu, 4 Sep 2025, Thierry DECHAIZE via Cygwin wrote:

> Hi,
>
> I test new implementation of LLVM 20.1.8 recently provided by CYGWIN64 on
> WIN11 64 bit.
>
> Just to illustrated this strange behaviour read joined text : some tests with
> different Resource Compiler.
>
> I'm not a specialist, but it's seem important to ameliorate this behaviour in
> future release of LLVM on Cygwin64.
>
> You agree ?

This was kind of hard to follow... TL;DR: using Windows-style paths with
Cygwin programs yields inconsistent results.  LLVM/Clang work better than
Binutils/GCC.

Specific failing case for llvm-windres:
$ mkdir src
$ touch src/resource.h
$ echo '#include "resource.h"' > src/test.rc
$ llvm-windres -v -o src/test.o src/test.rc
 /usr/bin/clang-21 --driver-mode=gcc -target x86_64-pc-windows-cygnus -E -xc -DRC_INVOKED src/test.rc -o /tmp/preproc-c14940.rc
$ llvm-windres -v -o src/test.o src\\test.rc
 /usr/bin/clang-21 --driver-mode=gcc -target x86_64-pc-windows-cygnus -E -xc -DRC_INVOKED "src\\test.rc" -o /tmp/preproc-9202d9.rc
src\test.rc:1:10: fatal error: 'resource.h' file not found
    1 | #include "resource.h"
      |          ^~~~~~~~~~~~
1 error generated.
llvm-rc: Preprocessing failed.


In general, it's better to stick with Cygwin paths (forward slashes,
/cygdrive/c/ instead of C:\) for Cygwin programs.  If you want native
LLVM/Clang that is also available, ie
https://github.com/mstorsjo/llvm-mingw or https://www.msys2.org CLANG64
environment

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