cmd/link: load of "ld -r" host object fails in -newobj mode #35779
Description
What version of Go are you using (go version)?
$ go version go version devel +9c6f6409ad Wed Nov 20 15:16:17 2019 +0000 linux/amd64
Does this issue reproduce with the latest release?
Yes.
What operating system and processor architecture are you using (go env)?
linux/amd64
What did you do?
Build a small program that links in a *.syso object that contains multiple static symbols that have the same name and section.
This is a bit elaborate, but here is a repro recipe:
$ cat /tmp/c1.c
static void blah() { }
int c1() { return 42; }
$ cat /tmp/c2.c
static void blah() { }
int c2() { return 42; }
$ gcc -c -o c1.o /tmp/c1.c
$ gcc -c -o c2.o /tmp/c2.c
$ ld -r -o ldr.syso c1.o c2.o
$ objdump -t ldr.syso | fgrep blah
0000000000000000 l F .text 0000000000000007 blah
0000000000000012 l F .text 0000000000000007 blah
$ rm c1.o c2.o
$ cat main.go
package main
func main() {
}
$ go build .
$ go build -asmflags=all=-newobj -gcflags=all=-newobj -ldflags=-newobj .
# ...
loadelf: $WORK/b001/_pkg_.a(ldr.syso): duplicate symbol reference: blah in both main(.text) and main(.text)
$
What did you expect to see?
Clean build with -newobj.
What did you see instead?
loadelf error.