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cmd/link, cmd/cgo: support -flto in CFLAGS

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The linker now accepts unrecognized object files in external linking mode.
These objects will simply be passed to the external linker.
This permits using -flto which can generate pure byte code objects,
whose symbol table the linker does not know how to read.

The cgo tool now passes -fno-lto when generating objects whose symbols
it needs to read. The cgo tool now emits matching types in different
objects, so that the lto linker does not report a mismatch.

This is based on https://golang.org/cl/293290 by Derek Parker.

For #43505
Fixes #43830
Fixes #46295

Change-Id: I6787de213417466784ddef5af8899e453b4ae1ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/322614
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
This commit is contained in:
Ian Lance Taylor 2021-05-25 16:31:41 -07:00
parent 272552275f
commit 24e9707cbf
8 changed files with 140 additions and 15 deletions
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2
src/cmd/cgo/gcc.go
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@ -1638,6 +1638,8 @@ func (p *Package) gccCmd() []string {
c = append(c, "-maix64")
c = append(c, "-mcmodel=large")
}
// disable LTO so we get an object whose symbols we can read
c = append(c, "-fno-lto")
c = append(c, "-") //read input from standard input
return c
}