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clang has started generating a -Wc11-extensions warning when compiling programs/prog_util.c and programs/tgetopt.c, because glibc's string.h started using _Generic. Let's go ahead and just upgrade the targeted C standard from C99 to C11. Even MSVC supports it now (though this does bump the requirement from Visual Studio 2015 to 2019 v16.8).
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Now that C11 is targeted, 'restrict' is now always supported.
MSVC doesn't drop the restrict qualifier from arguments when assessing
function prototype compatibility, causing warning C4113 on the line
'decompress_func_t decompress_impl = dispatch_decomp;'. Work around
this by adding restrict qualifiers to dispatch_decomp().
Note that MSVC's behavior seems to violate the following from C11:
In the determination of type compatibility and of a composite type,
each parameter declared with function or array type is taken as
having the adjusted type and each parameter declared with qualified
type is taken as having the unqualified version of its declared
type.
The windows-visualstudio-build-and-test job stopped being able to find zlib because the filename changed. Update the filename.
Ubuntu shipped a clang version that broke backwards compatibility by requiring evex512 and no-evex512 flags. It was rolled back in the next version, but for now, this workaround is still needed. Fixes the "Build and test (x86_64, ubuntu-24.04, clang)" job.
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