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Michael Matloob a2d01473ae cmd/go: support cgo files in overlays
This is a roll-forward of golang.org/cl/267197, which was reverted in
golang.org/cl/267357. It makes the following changes in addition to
the ones in the next paragraph: It avoids outputting trimpath
arguments for an overlay unless the overlay affects the package being
compiled (to avoid hitting windows command line argument limits), and
it fixes processing of regexps in the script test framework to treat
the first *non flag* argument to grep, stdout, and stderr as a regexp,
not just the first argument.

golang.org/cl/267917 was a roll-forward of golang.org/cl/262618, which
was reverted in golang.org/cl/267037. The only differences between
this CL and the original were the three calls to fflush from the C
files in build_overlay.txt, to guarantee that the string we were
expecting was
actually written out.

The CL requires rewriting the paths of the files passed to the cgo
tool toolchain to use the overlaid paths instead of the disk paths of
files. Because the directories of the overlaid paths don't exist in
general, the cgo tool have been updated to run in base.Cwd instead of
the package directory.

For #39958

Change-Id: I1bd96db257564bcfd95b3502aeca14d04bd28618
Reviewed-on: https://go-review.googlesource.com/c/go/+/267797
Trust: Michael Matloob <matloob@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2020-11-09 19:46:24 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api api: update next.txt 2020-10-29 20:51:49 +00:00
doc crypto/tls: add HandshakeContext method to Conn 2020-11-09 18:34:47 +00:00
lib/time lib/time, time/tzdata: update tz data to 2020d 2020-10-24 21:42:44 +00:00
misc cmd/dist,cmd/go,runtime: add support for cgo on linux/riscv64 2020-11-03 12:59:51 +00:00
src cmd/go: support cgo files in overlays 2020-11-09 19:46:24 +00:00
test cmd/compile: make sure linkname'd symbol is non-package 2020-11-09 16:09:16 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add Kush Patel (corporate CLA for Hootsuite Inc) 2020-07-08 00:10:44 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: update for the Go 1.15 release 2020-08-10 21:51:48 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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