linter should ignore C/C++ sources

[vitalyisaev2]

It seems like linter tries to analyze *.cc files that may occur in cgo projects. Since it treats them just like common *.go files, it causes false arams.

main.go:

package main

import (
	"fmt"

	"gopkg.in/kothar/brotli-go.v0/enc"
)

func main() {
	params := enc.NewBrotliParams()
	fmt.Println(params)
}

This file can be compiled and run, but doesn't pass typecheck:

➜  linter-issue go run .
&{{0 11 22 0 true false false true}}
➜  linter-issue golangci-lint run .   
main.go:1: /home/isaev/go/src/gopkg.in/kothar/brotli-go.v0/enc/backward_references.cc:9:1: illegal character U+0023 '#' (typecheck)
package main

1. Version of golangci-lint: golangci-lint --version (or git commit if you don't use binary distribution)
   7514bf823931b8c777a68ba7a7af8e5217fff191

2. Config file: cat .golangci.yml
   No config file is used.

3. Go environment: go version && go env

go version go1.12 linux/amd64
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/isaev/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/isaev/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
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-build596847704=/tmp/go-build -gno-record-gcc-switches"

4. Verbose output of running: golangci-lint run -v

golangci-lint run -v .
INFO [config_reader] Config search paths: [./ /home/isaev/go/src/github.com/vitalyisaev2/linter-issue /home/isaev/go/src/github.com/vitalyisaev2 /home/isaev/go/src/github.com /home/isaev/go/src /home/isaev/go /home/isaev /home /] 
INFO [lintersdb] Active 10 linters: [deadcode errcheck gosimple govet ineffassign staticcheck structcheck typecheck unused varcheck] 
INFO [lintersdb] Optimized sublinters [staticcheck gosimple unused] into metalinter megacheck 
INFO [loader] Go packages loading at mode load deps types and syntax took 742.125074ms 
INFO [loader] SSA repr building timing: packages building 4.937668ms, total 36.069116ms 
INFO [loader] Packages that do not compile: [github.com/vitalyisaev2/linter-issue] 
INFO [runner] worker.7 took 76.357µs with stages: errcheck: 52.698µs, varcheck: 2.864µs 
INFO [runner] worker.6 took 833ns                 
INFO [runner] worker.3 took 37.586µs with stages: deadcode: 21.01µs 
INFO [runner] worker.1 took 28.934µs              
INFO [runner] worker.5 took 141.67µs              
INFO [runner] worker.2 took 278.9µs with stages: typecheck: 120.243µs, structcheck: 20.106µs 
INFO [runner] worker.4 took 405.213µs with stages: ineffassign: 365.296µs, govet: 12.664µs 
main.go:1: /home/isaev/go/src/gopkg.in/kothar/brotli-go.v0/enc/backward_references.cc:9:1: illegal character U+0023 '#' (typecheck)
package main
INFO [runner] worker.8 took 236.518326ms with stages: megacheck: 236.509499ms 
INFO [runner] Workers idle times: #1: 236.318923ms, #2: 236.248691ms, #3: 236.323475ms, #4: 236.128353ms, #5: 236.281168ms, #6: 236.327591ms, #7: 236.354175ms 
INFO [runner] Issues before processing: 2, after processing: 1 
INFO [runner] processing took 374.161µs with stages: identifier_marker: 159.691µs, exclude: 116.6µs, source_code: 28.743µs, cgo: 16.878µs, path_prettifier: 14.418µs, skip_dirs: 13.585µs, nolint: 11.939µs, max_same_issues: 2.148µs, replacement_builder: 2.061µs, uniq_by_line: 1.965µs, path_shortener: 1.462µs, diff: 1.307µs, max_per_file_from_linter: 1.043µs, max_from_linter: 960ns, autogenerated_exclude: 802ns, skip_files: 374ns, exclude-rules: 185ns 
INFO Memory: 11 samples, avg is 130.4MB, max is 204.5MB 
INFO Execution took 1.05068674s

[jirfag]

thank you!
closing it as #438 was merged