On Fri, 20 Feb 2026, Kirill Makurin wrote:
When you configuring such a package with autoconf-like
checks, you'll run those tests against msvcrt.dll on the build system,
which is likely to be Windows 10/11, which has many functions not
available in ancient versions of msvcrt.dll. You'll build the project
and it'll run on the build system, but it may fail to load on old system
with older versions of msvcrt.dll.
This is not true.
When autoconf does a compile/link test, it links against the msvcrt import
library in the form it is provided by mingw-w64. Whatever version of
msvcrt.dll is available on the build system is entirely irrelevant; you
may be cross compiling where there's no system msvcrt.dll at all. The only
case it makes a difference is if the autoconf project is set up to do not
just compile+link, but compile+link+execute tests, but that is rare.
// Martin
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