On Tue, 23 Dec 2025, Pali Rohár wrote:
Hello, according to the information on Microsoft website
https://learn.microsoft.com/en-us/cpp/cppcx/crt-functions-not-supported-in-universal-windows-platform-apps
Environment variables functions are not available for UWP applications.
But currently mingw-w64 puts libapi-ms-win-crt-environment-l1-1-0.a
import library into the final libucrtapp.a library.
I have feeling that this is incorrect and import library
libapi-ms-win-crt-environment-l1-1-0.a should not be present in the
mingw-w64-crt/lib-common/ucrtapp.mri.
Just to note that in msvcr120_app.dll are missing all env functions.
There is just _environ symbol but it is NULL, same as 3rd argument
passed to main(). As the msvcr120_app.dll is another library specially
for Store / UWP apps, this can be an another proof that env functions
are not available.
Could you check if the api-ms-win-crt-environment-l1-1-0.dll is allowed
to use in UWP and if it should be part of our libucrtapp.a library?
I think the page you're linking to is outdated.
The exact set of allowed functions has changed over time. It's not a
technical limitation (it's not that the earlier versions of Windows 10
would refuse to run an UWP app that used such APIs), but it would be that
Microsoft would reject such an app in the Store submission process, as far
as I know. Therefore it's technically ok to widen the set of permitted
APIs over time.
When looking at "App Certification Kit/SupportedAPIs-x64.xml" in an old
(10.0.10586.0) version of the Windows 10 SDK, only very few functions are
allowed from api-ms-win-crt-environment-l1-1-0.dll. With a newer version
of the Windows 10 SDK (10.0.17763.0), many more functions from
api-ms-win-crt-environment-l1-1-0.dll are allowed.
So I see no reason to remove it from libucrtapp.a. For msvcr120_app.dll,
that's from an earlier time when those functions indeed were not
available.
// Martin
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