cgo: C compiler "D:\\Program" not found. Is space symbol in CC variable bugged again ?

[vault-thirteen]

What version of Go are you using (go version)?

go version
go1.20.3 windows/amd64

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

Windows 10,
Intel x86-64.

go env Output

$ go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=J:\Go\cache
set GOENV=C:\Users\***\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=J:\Go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=J:\Go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=D:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=D:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.20.3
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=D:\Program Files\LLVM\bin\clang.exe
set CXX=g++
set CGO_ENABLED=1
set GOMOD=J:\Go\src\test\sdl-wrapper\go.mod
set GOWORK=
set CGO_CFLAGS=-O2 -g
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-O2 -g
set CGO_FFLAGS=-O2 -g
set CGO_LDFLAGS=-O2 -g
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=. -m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=C:\Users\***\AppData\Local\Temp\go-build***=/tmp/go-build -gno-record-gcc-switches

What did you do?

I am trying to compile a binary using CGO.

go build .

The compiler exists at the path specified in CC variable.
Proof:

go env CC
D:\Program Files\LLVM\bin\clang.exe

"D:\Program Files\LLVM\bin\clang.exe" -v
clang version 16.0.0
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: D:\Program Files\LLVM\bin

What did you expect to see?

Successful compilation.

What did you see instead?

# runtime/cgo
cgo: C compiler "D:\\Program" not found: exec: "D:\\Program": file does not exist

[seankhliao]

From the fix in #41400, I believe you're expected to quote the CC path if it contains spaces

[vault-thirteen]

OK. I have found out that I have two ways to do it.

1. Golang way:

go env -w CC="\"D:\Program Files\LLVM\bin\clang.exe\""
go env CC
"D:\Program Files\LLVM\bin\clang.exe"

2. Windows way:

SET CC="D:\Program Files\LLVM\bin\clang.exe"

ECHO %CC%
"D:\Program Files\LLVM\bin\clang.exe"

go env CC
"D:\Program Files\LLVM\bin\clang.exe"