cmd/go: macOS plugin builds are not reproducible #58557
Description
What version of Go are you using (go version)?
Tested with Go 1.19 and Go 1.20
$ go version go version go1.19.5 darwin/arm64
$ go version go version go1.20.1 darwin/arm64
Does this issue reproduce with the latest release?
Yes.
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GO111MODULE="" GOARCH="arm64" GOBIN="" GOCACHE="/Users/roman/Library/Caches/go-build" GOENV="/Users/roman/Library/Application Support/go/env" GOEXE="" GOEXPERIMENT="" GOFLAGS="" GOHOSTARCH="arm64" GOHOSTOS="darwin" GOINSECURE="" GOMODCACHE="/Users/roman/go/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="darwin" GOPATH="/Users/roman/go" GOPRIVATE="" GOPROXY="https://proxy.golang.org/,direct" GOROOT="/Users/roman/Work/Ridge/tectonic/_deps.darwin-arm64/go-1.20.1" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/Users/roman/Work/Ridge/tectonic/_deps.darwin-arm64/go-1.20.1/pkg/tool/darwin_arm64" GOVCS="" GOVERSION="go1.20.1" GCCGO="gccgo" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="/Users/roman/Work/Ridge/tectonic/go.mod" GOWORK="" CGO_CFLAGS="-O2 -g" CGO_CPPFLAGS="" CGO_CXXFLAGS="-O2 -g" CGO_FFLAGS="-O2 -g" CGO_LDFLAGS="-O2 -g" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/w2/fyw22w5x5737wfqnpw5ngnc40000gn/T/go-build2948842969=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
I have created a package with single main function and built it on Mac twice as a plugin:
package main
func main() {}
go build -trimpath -buildvcs=false -buildmode=plugin -o a.so .
go build -trimpath -buildvcs=false -buildmode=plugin -o b.so .
The resulting binaries differ.
Reproducer is at https://github.com/misha-ridge/test-plugin-build
What did you expect to see?
I expected the binaries to be identical.
What did you see instead?
Plugin embeds a temporary directory path, plus some other differences that might be related to it:
--- /dev/fd/63 2023-02-16 10:47:27
+++ /dev/fd/62 2023-02-16 10:47:27
@@ -113,7 +113,7 @@
00000700 64 65 72 73 2f 39 35 2f 76 7a 77 63 76 35 79 64 |ders/95/vzwcv5yd|
00000710 33 32 78 33 36 39 7a 30 63 39 74 34 62 66 72 30 |32x369z0c9t4bfr0|
00000720 30 30 30 30 67 6e 2f 54 2f 67 6f 2d 62 75 69 6c |0000gn/T/go-buil|
-00000730 64 31 38 39 36 31 38 31 30 36 30 2f 62 30 30 31 |d1896181060/b001|
+00000730 64 34 30 38 38 30 39 37 33 31 37 2f 62 30 30 31 |d4088097317/b001|
00000740 2f 65 78 65 2f 61 2e 6f 75 74 2e 73 6f 00 00 00 |/exe/a.out.so...|
00000750 34 00 00 80 10 00 00 00 00 00 11 00 48 2d 00 00 |4...........H-..|
00000760 33 00 00 80 10 00 00 00 48 2d 11 00 08 2d 00 00 |3.......H-...-..|
@@ -124,7 +124,7 @@
000007b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000007c0 28 11 12 00 44 01 00 00 00 00 00 00 00 00 00 00 |(...D...........|
000007d0 00 00 00 00 00 00 00 00 1b 00 00 00 18 00 00 00 |................|
-000007e0 39 45 f5 ea 0b 6e 3b 3b ba 71 2b 6d e9 69 0a 0a |9E...n;;.q+m.i..|
+000007e0 0a c9 64 b8 eb f2 39 97 b9 ea b9 30 3d a0 3f 2f |..d...9....0=.?/|
000007f0 32 00 00 00 20 00 00 00 01 00 00 00 00 00 0d 00 |2... ...........|
00000800 00 01 0d 00 01 00 00 00 03 00 00 00 00 01 34 03 |..............4.|
00000810 2a 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 |*...............|
@@ -74414,9 +74414,9 @@
0012ff80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
0012ffa0 00 06 80 00 00 00 00 00 00 00 00 00 61 2e 6f 75 |............a.ou|
-0012ffb0 74 00 21 40 04 9e 12 52 25 b7 3f 1f 1c 73 1f e2 |[email protected]%.?..s..|
-0012ffc0 6a 66 ba 9e 1d 06 01 62 9c 52 53 97 e4 69 e2 16 |jf.....b.RS..i..|
-0012ffd0 76 c5 ad 7f ac b2 58 6f c6 e9 66 c0 04 d7 d1 d1 |v.....Xo..f.....|
+0012ffb0 74 00 be f5 bf aa 8d 4d 87 8a b8 93 bf bd 90 fc |t......M........|
+0012ffc0 fe 3e f6 e7 54 cb 57 58 fe 78 bd e5 f8 cf fa 57 |.>..T.WX.x.....W|
+0012ffd0 c9 87 ad 7f ac b2 58 6f c6 e9 66 c0 04 d7 d1 d1 |......Xo..f.....|
0012ffe0 6b 02 4f 58 05 ff 7c b4 7c 7a 85 da bd 8b 48 89 |k.OX..|.|z....H.|
0012fff0 2c a7 ad 7f ac b2 58 6f c6 e9 66 c0 04 d7 d1 d1 |,.....Xo..f.....|
00130000 6b 02 4f 58 05 ff 7c b4 7c 7a 85 da bd 8b 48 89 |k.OX..|.|z....H.|