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CGo is needed for the rp2040 and for macOS (GOOS=darwin), without it
these targets just won't work. And there really isn't a benefit from
disabling CGo: we don't need any external linkers for example.
This avoids a somewhat common issue of people having CGO_ENABLED=0
somewhere in their environment and not understanding why things don't
work. See for example: https://github.com/tinygo-org/tinygo/issues/3450
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This allows us to test a large corpus of external packages against the compiler.
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This makes it possible to select the Go version using GOROOT, and works
even if the `go` binary is not in $PATH.
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There were a few problems with the go/packages package. While it is more
or less designed for our purpose, it didn't work quite well as it didn't
provide access to indirectly imported packages (most importantly the
runtime package). This led to a workaround that sometimes broke
`tinygo test`.
This PR contains a number of related changes:
* It uses `go list` directly to retrieve the list of packages/files to
compile, instead of relying on the go/packages package.
* It replaces our custom TestMain replace code with the standard code
for running tests (generated by `go list`).
* It adds a dummy runtime/pprof package and modifies the testing
package, to get tests to run again with the code generated by
`go list`.
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