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To: cygwin@cygwin.com
Subject: Re: GCC doesn't find relative includes when passed paths using
 backward-slashes
References: <c593e554-d8ac-a0e5-96c0-c54fe9db633e@grundis.de>
Date: Sun, 15 Jan 2023 17:23:08 +0100
In-Reply-To: <c593e554-d8ac-a0e5-96c0-c54fe9db633e@grundis.de> (Alexander
 Grund via Cygwin's message of "Sun, 15 Jan 2023 13:38:31 +0100")
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From: Achim Gratz via Cygwin <cygwin@cygwin.com>
Reply-To: Achim Gratz <Stromeko@nexgo.de>
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Alexander Grund via Cygwin writes:
> consider the following MWE:
>
> |$ touch bar/foo.h $ cat bar/main.cpp #include "foo.h" int main(){}
> |With this most simple setup calling GCC with `g++ "bar\main.cpp"`
> |results in GCC failing to find the include file. However using `g++
> |"bar/main.cpp"` works as expected. |

Giving any Cygwin tools non-POSIX path constructs is asking for trouble,
notwithstanding the fact that sometimes it works (or seems to work).

> |So the compiler does find the CPP file and also is able to resolve
> | others paths passed with backslashes (e.g. -I arguments) but
> | basically disables resolving includes relative to the file including
> | it. For context: This turned up on CI for Boost where
> | "|C:\cygwin64\bin" is added to the PATH env variable to be able to
> | use the Cygwin GCC with B2. The build system, finding it is running
> | on Windows, will pass paths with backward slashes to the
> | compiler.

Then use a build system that doesn't do this.

> | This happens on both CMD with the added PATH and using the
> | bash. For reference I tried the same with MinGW and there either
> | path separator worked. So it seems to be an issue in the Cygwin
> | builds of GCC.

No it isn't, just like you couldn't expect this to work on Linux.


Achim.
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