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

go version go1.10.1 linux/amd64

Does this issue reproduce with the latest release?

I guess, don't see why it wouldn't :P

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

GOARCH="amd64"
GOBIN=""
GOCACHE="/home/karalabe/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/work"
GORACE=""
GOROOT="/opt/google/go"
GOTMPDIR=""
GOTOOLDIR="/opt/google/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build670060735=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Some C libraries (e.g. openssl) expect/require macros containing a quoted string. However, CGO chokes on quotes failing with malformed argument errors:

package main

/*
#cgo CFLAGS: -DMYDEFINE='"quotedstring"'
*/
import "C"

func main() {}

What did you expect to see?

I expect this file to build/run successfully.

What did you see instead?

$ go run main.go 
package main: [...]/main.go: malformed #cgo argument: -DMYDEFINE="quotedstring"

Note, I can hack around this issue by replacing the CGO preamble statement with a direct define

package main

/*
#define MYDEFINE "quotedstring"
*/
import "C"

func main() {}

but the issue is that I would need to inject this into all CGO enabled Go files, opposed to just having a single CGO preamble file for all the sources.