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I tried before to make relative imports work by simply invoking the compiler in the right directory, so that an import of ./foo could be resolved by ./foo.a. This required creating a separate tree of package binaries that included the full path to the source directory, so that /home/gopher/bar.go would be compiled in tmpdir/work/local/home/gopher and perhaps find a ./foo.a in that directory. This model breaks on Windows because : appears in path names but cannot be used in subdirectory names, and I missed one or two places where it needed to be removed. The model breaks more fundamentally when compiling a test of a package that lives outside the Go path, because we effectively use a ./ import in the generated testmain, but there we want to be able to resolve the ./ import of the test package to one directory and all the other ./ imports to a different directory. Piggybacking on the compiler's current working directory is then no longer possible. Instead, introduce a new compiler option -D prefix that makes the compiler turn a ./ import into prefix+that, so that import "./foo" with -D a/b/c turns into import "a/b/c/foo". Then we can invent a package hierarchy "_/" with subdirectories named for file system paths: import "./foo" in the directory /home/gopher becomes import "_/home/gopher/foo", and since that final path is just an ordinary import now, all the ordinary processing works, without special cases. We will have to change the name of the hierarchy if we ever decide to introduce a standard package with import path "_", but that seems unlikely, and the detail is known only in temporary packages that get thrown away at the end of a build. Fixes #3169. R=golang-dev, r CC=golang-dev https://golang.org/cl/5732045 |
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