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Disable Windows critical error handler #5828

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merged 1 commit into from
Feb 12, 2024
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@dra27 dra27 commented Feb 11, 2024

When the WIndows loader cannot find DLLs, the default, very very legacy behaviour is to display a dialog such as this:

image

This dialog is problematic, as it's part of the loader, so the application itself is not able to handle this itself. It's doubly problematic for us, as it's blocking.

The convention is that calling applications are expected to disable this error handler. New processes inherit this setting, which causes the loader to suppress the dialog box and instead return an exit code. This is documented best practice (see the notes for SEM_FAILCRITICALERRORS in SetErrorMode on MSDN).

In particular, this suppresses the "execution cannot proceed because
X.dll was not found" dialog, instead returning an exit code.

Calling this at program startup is already recommended best practice for
Windows applications.
@dra27 dra27 added this to the 2.2.0~beta2 milestone Feb 11, 2024
@rjbou rjbou self-requested a review February 12, 2024 13:20
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As there is no simple way to have more information on the missing DLL, lgtm! thanks

@dra27 dra27 merged commit 55d45ad into ocaml:master Feb 12, 2024
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dra27 commented Feb 12, 2024

Let's get it merged before that screenshot of the dialog grows any further!

@dra27 dra27 deleted the critical-errors branch February 12, 2024 15:07
@dra27 dra27 mentioned this pull request Jun 13, 2024
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3 participants