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test/codegen: mention in README that tests only run on Linux without -all_codegen

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This took me a while to figure out. The relevant code is in
test/run.go (note the "linux" hard-coded strings):

	var arch, subarch, os string
	switch {
	case archspec[2] != "": // 3 components: "linux/386/sse2"
		os, arch, subarch = archspec[0], archspec[1][1:], archspec[2][1:]
	case archspec[1] != "": // 2 components: "386/sse2"
		os, arch, subarch = "linux", archspec[0], archspec[1][1:]
	default: // 1 component: "386"
		os, arch, subarch = "linux", archspec[0], ""
		if arch == "wasm" {
			os = "js"
		}
	}

Change-Id: I92ba280025d2072e17532a5e43cf1d676789c167
Reviewed-on: https://go-review.googlesource.com/c/go/+/222819
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Russ Cox 2020-03-10 13:31:15 -04:00
parent 0e3ace42f5
commit 801a9d9a0c
1 changed files with 4 additions and 2 deletions
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6
test/codegen/README
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@ -16,8 +16,10 @@ step of the top-level test/run.go suite, called "asmcheck".
The codegen harness is part of the all.bash test suite, but for
performance reasons only the codegen tests for the host machine's
GOARCH are enabled by default. To perform comprehensive tests for all
the supported architectures, one can run the following command
GOARCH are enabled by default, and only on GOOS=linux.
To perform comprehensive tests for all the supported architectures
(even on a non-Linux system), one can run the following command
$ ../bin/go run run.go -all_codegen -v codegen