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Russ Cox c1a4fc3b36 cmd/go: add $GOFLAGS environment variable
People sometimes want to turn on a particular go command flag by default.
In Go 1.11 we have at least two different cases where users may need this.

1. Linking can be noticeably slower on underpowered systems
due to DWARF, and users may want to set -ldflags=-w by default.

2. For modules, some users or CI systems will want vendoring always,
so they want -getmode=vendor (soon to be -mod=vendor) by default.

This CL generalizes the problem to “set default flags for the go command.”

$GOFLAGS can be a space-separated list of flag settings, but each
space-separated entry in the list must be a standalone flag.
That is, you must do 'GOFLAGS=-ldflags=-w' not 'GOFLAGS=-ldflags -w'.
The latter would mean to pass -w to go commands that understand it
(if any do; if not, it's an error to mention it).

For #26074.
For #26318.
Fixes #26585.

Change-Id: I428f79c1fbfb9e41e54d199c68746405aed2319c
Reviewed-on: https://go-review.googlesource.com/126656
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
2018-08-01 00:35:21 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api api: add ErrorHandler function to httputil.ReverseProxy 2018-07-19 20:39:19 +00:00
doc doc: fix link in contribute.html 2018-07-31 21:42:50 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc cmd/cgo: make sure we FinishType everything 2018-07-31 19:29:20 +00:00
src cmd/go: add $GOFLAGS environment variable 2018-08-01 00:35:21 +00:00
test cmd/compile: set stricter inlining threshold in large functions 2018-07-24 16:11:08 +00:00
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