[release-branch.go1.15] cmd/link: pass arch-specific flags to external linker when testing supported flag
When testing if a flag (e.g. "-no-pie") is supported by the
external linker, pass arch-specific flags (like "-marm").
In particular, on the ARM builder, if CGO_LDFLAGS=-march=armv6
is set, the C toolchain fails to build if -marm is not passed.
# cc -march=armv6 1.c
1.c: In function 'main':
1.c:3:1: sorry, unimplemented: Thumb-1 hard-float VFP ABI
int main() {
^~~
This makes the Go linker think "-no-pie" is not supported when it
actually is.
Passing -marm makes it work.
Fixes #46684.
Change-Id: I4e8b71f08818993cbbcb2494b310c68d812d6b50
Reviewed-on: https://go-review.googlesource.com/c/go/+/278592
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
(cherry picked from commit
a318d56c1e6e89996a3852a780f45c792d860d64)
Reviewed-on: https://go-review.googlesource.com/c/go/+/326711
Run-TryBot: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>