cmd/link: using CGO with DWARF5 generates malformed Windows binaries #75077
Description
Go version
go version go1.25.0 windows/amd64
Output of go env in your module/workspace:
set AR=ar
set CC=gcc
set CGO_CFLAGS=-O2 -g
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-O2 -g
set CGO_ENABLED=1
set CGO_FFLAGS=-O2 -g
set CGO_LDFLAGS=-O2 -g
set CXX=g++
set GCCGO=gccgo
set GO111MODULE=on
set GOAMD64=v1
set GOARCH=amd64
set GOAUTH=netrc
set GOBIN=
set GOCACHE=C:\Users\cj\AppData\Local\go-build
set GOCACHEPROG=
set GODEBUG=
set GOENV=C:\Users\cj\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFIPS140=off
set GOFLAGS=
set GOGCCFLAGS=-m64 -mthreads -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=C:\Users\cj\AppData\Local\Temp\go-build3808498674=/tmp/go-build -gno-record-gcc-switches
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\cj\go\pkg\mod
set GOOS=windows
set GOPATH=C:\Users\cj\go
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:/Program Files/Go
set GOSUMDB=sum.golang.org
set GOTELEMETRY=local
set GOTELEMETRYDIR=C:\Users\cj\AppData\Roaming\go\telemetry
set GOTMPDIR=
set GOTOOLCHAIN=auto
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.25.0
set GOWORK=
set PKG_CONFIG=pkg-configWhat did you do?
As of Go 1.25, a simple app which uses CGO will fail to run on Windows with the error failed to run: The specified executable is not a valid application for this OS
Example code: https://go.dev/play/p/YKuBXwCGWAd
This same code will run successfully when built with GOEXPERIMENT=nodwarf5 OR stripping debug info -ldflags="-s -w"
dumpbin.exe output shows sections being placed at virtual addresses outside of the normal Windows PE address space.
With DWARF5 enabled:
SECTION HEADER #1
/4 name (.debug_rnglists)
1B7D1 virtual size
C0000000 virtual address (0000000200000000 to 000000020001B7D0)
1B800 size of raw data
548 file pointer to raw data (00000548 to 0001BD47)
0 file pointer to relocation table
0 file pointer to line numbers
0 number of relocations
0 number of line numbers
42100040 flags
Initialized Data
RESERVED - UNKNOWN
Discardable
Read Only
With GOEXPERIMENT=nodwarf5:
SECTION HEADER #1
.text name
B0720 virtual size
1000 virtual address (0000000140001000 to 00000001400B171F)
B0800 size of raw data
600 file pointer to raw data (00000600 to 000B0DFF)
0 file pointer to relocation table
0 file pointer to line numbers
0 number of relocations
0 number of line numbers
60600060 flags
Code
Initialized Data
RESERVED - UNKNOWN
RESERVED - UNKNOWN
Execute Read
What did you see happen?
Program 'main.exe' failed to run: The specified executable is not a valid application for this OS platform.At line:1 char:1
What did you expect to see?
Message: Hello from C!