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adds loongarch64 and riscv32
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This was a bit trickier than it should be due to symbol conflicts with
zig's compiler-rt implementation. We attempt to use weak linkage in
our compiler-rt, but this does not seem to be working in all cases. I
manually disabled export of the problematic compiler-rt math functions
in order to cross compile musl's libc.so for all targets as input to
`tools/gen_stubs.zig`.
Other than that, this update went fairly smoothly. Quite a few
additional symbols were added to the blacklist in `tools/gen_stubs.zig`
due to recent reorganization of zig's compiler-rt.
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This commit also corrects a mistake from commit
6dc2236054dfcf911ce848f67a4078740a90783a which did not properly delete
files when upgrading to the 1.2.2 musl headers.
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The previous
[instructions](https://github.com/ziglang/zig/wiki/Updating-libc) for
updating musl libc headers had this (repeated for each architecture):
make DESTDIR=build-all/arm install-headers ARCH=arm
However musl's build system does not properly rebuild alltypes.h and
syscall.h from source, instead using whatever is cached from the
previous build. In the case of the previous time that I updated to musl
1.1.23, this happened to be the aarch64 architecture.
As a workaround, one can remove the obj/ directory to force rebuilding
this file. Now the instructions say this (repeated for each architecture):
rm -rf obj/ && make DESTDIR=build-all/arm install-headers ARCH=arm
This commit updates the resulting headers after this workaround is
applied and the process headers tool is run again.
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