On Fri, Dec 19, 2025 at 4:04 PM Senthil Kumar
<[email protected]> wrote:
>
> Hello,
>
> In Win 10 and later, Windows removed MAX_PATH path length limitations
> but made it so that applications would have to opt-in by shipping a
> manifest with "longPathAware" set to true.
>
> gcc already ships with a manifest, sourced from
> gcc/config/i386/winnt-utf8.manifest when built for MinGW host. The
> manifest currently enables UTF-8 code page, but the XML namespaces
> don't line up with Microsoft's documentation (see
>
> https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests#activeCodePage)
> and also
> https://gcc.gnu.org/pipermail/gcc-patches/2025-December/702559.html.
>
> This patch fixes that and also adds longPathAware to the
> settings. Verified by inspecting the PEB on a Windows machine with the
> registry settings also configured to turn on long path support.
>
> Ok for master?
>
> gcc/ChangeLog:
>
> * config/i386/winnt-utf8.manifest: Fix namespaces and set
> longPathAware to true.
>
> diff --git a/gcc/config/i386/winnt-utf8.manifest
> b/gcc/config/i386/winnt-utf8.manifest
> index dab929e1515..c0bdb362c7b 100644
> --- a/gcc/config/i386/winnt-utf8.manifest
> +++ b/gcc/config/i386/winnt-utf8.manifest
> @@ -1,8 +1,9 @@
> -<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
> -<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
> - <application>
> - <windowsSettings>
> - <activeCodePage
> xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings";>UTF-8</activeCodePage>
> - </windowsSettings>
> - </application>
> -</assembly>
> +<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
> +<assembly manifestVersion="1.0"
> xmlns="urn:schemas-microsoft-com:asm.v1"
> xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
> + <asmv3:application>
> + <asmv3:windowsSettings>
> + <longPathAware
> xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings";>true</longPathAware>
> + <activeCodePage
> xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings";>UTF-8</activeCodePage>
> + </asmv3:windowsSettings>
> + </asmv3:application>
> +</assembly>
