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cmd/go: handle -C properly during toolchain switches

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The -C dir flag was added in Go 1.20.
This CL adds a new restriction: the -C must appear as the first flag on the command line.
This restriction makes finding the -C flag robust and matches the general way
people tend to think about and use the -C flag anyway.
It may break a few scripts that have been written since Go 1.20
but hopefully they will not be hard to find and fix.
(There is no strict compatibility guarantee for the command line.)

For #57001.

Change-Id: Ice2e5982c58d41eabdaef42a80d3624cde2c9873
Reviewed-on: https://go-review.googlesource.com/c/go/+/500915
TryBot-Bypass: Russ Cox <rsc@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
This commit is contained in:
Russ Cox 2023-06-05 11:19:03 -04:00
parent e23273ddd4
commit 96d8d3eb32
8 changed files with 140 additions and 46 deletions
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1
src/cmd/go/internal/work/build.go
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@ -61,6 +61,7 @@ and test commands:
Change to dir before running the command.
Any files named on the command line are interpreted after
changing directories.
If used, this flag must be the first one in the command line.
-a
force rebuilding of packages that are already up-to-date.
-n