[Bug c++/107974] New: compiler can't find source file in path that is longer than 255 characters

[Bug c++/107974] New: compiler can't find source file in path that is longer than 255 characters

[cristian.adam at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974

            Bug ID: 107974
           Summary: compiler can't find source file in path that is longer
                    than 255 characters
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cristian.adam at gmail dot com
  Target Milestone: ---

Created attachment 54013
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54013&action=edit
clang long path

Given the following path "c:\Projects\C++\this is a rather long path for a path
on windows where long paths are a problem with the limit of two hundred fifty
characters but there is a solution which implies adding a registry key and
configuring the project to include a manifest\hello.cpp"

g++ (x86_64-posix-seh-rev1, Built by MinGW-W64 project) 12.2.0 is not able to
compile the source file.

The error reported is:
cc1plus.exe: fatal error: hello.cpp: No such file or directory

Note that LLVM MinGW 15.0.0's clang.exe was able to compile the file just fine.

[Bug c++/107974] compiler can't find source file in path that is longer than 255 characters

[cristian.adam at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974

--- Comment #1 from Cristian Adam <cristian.adam at gmail dot com> ---
Visual C++ 2022 also suffers from the same problem, see
https://developercommunity.visualstudio.com/t/compiler-cant-find-source-file-in-path/10221576

For some reason clang is working fine.

[Bug c++/107974] compiler can't find source file in path that is longer than 255 characters

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC just does:
    file->fd = open (file->path, O_RDONLY | O_NOCTTY | O_BINARY, 0666);

[Bug preprocessor/107974] compiler can't find source file in path that is longer than 255 characters

[cristian.adam at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974

--- Comment #3 from Cristian Adam <cristian.adam at gmail dot com> ---
I've used the manifest tool from Visual C++ (mt.exe) to inject this manifest:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!-- Copyright (c) Microsoft Corporation -->
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<application  xmlns="urn:schemas-microsoft-com:asm.v3">
    <windowsSettings
xmlns:ws2="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
        <ws2:longPathAware>true</ws2:longPathAware>
    </windowsSettings>
</application>
</assembly>

with the command line:
mt.exe -nologo -manifest "cc1plus.exe.manifest"
-outputresource:"cc1plus.exe;#1"

And I was able to compile the hello.cpp source file!

[Bug preprocessor/107974] compiler can't find source file in path that is longer than 255 characters

[cristian.adam at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974

--- Comment #4 from Cristian Adam <cristian.adam at gmail dot com> ---
The manifest file is being mentioned at
https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry

[Bug preprocessor/107974] compiler can't find source file in path that is longer than 255 characters

[cristian.adam at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974

--- Comment #5 from Cristian Adam <cristian.adam at gmail dot com> ---
Created attachment 54016
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54016&action=edit
gcc long path working

[Bug preprocessor/107974] compiler can't find source file in path that is longer than 255 characters

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2022-12-05

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I would suspect this is a standard issue with all mingw projects so maybe it is
best to talk with them on how to solve this overall.

[Bug preprocessor/107974] compiler can't find source file in path that is longer than 255 characters

[nightstrike at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974

nightstrike <nightstrike at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nightstrike at gmail dot com

--- Comment #7 from nightstrike <nightstrike at gmail dot com> ---
Someone with build system experience could modify the build of the toolchain
binaries to include a call to windres to add the manifest. This would just be
gcc itself and not what gcc produces. I guess maybe the binutils executables
would benefit also.