staticcheck: configurable Go version. (#1946)

.golangci.example.yml

@@ -358,6 +358,10 @@ linters-settings:
         per_char_threshold: "3.0"
         truncate: "32"
 
+  gosimple:
+    # Select the Go version to target. The default is '1.13'.
+    go: "1.15"
+
   govet:
     # report about shadowed variables
     check-shadowing: true
@@ -488,6 +492,14 @@ linters-settings:
       - name: indent-error-flow
         severity: warning
 
+  staticcheck:
+    # Select the Go version to target. The default is '1.13'.
+    go: "1.15"
+
+  stylecheck:
+    # Select the Go version to target. The default is '1.13'.
+    go: "1.15"
+
   tagliatelle:
     # check the struck tag name case
     case:
@@ -531,11 +543,8 @@ linters-settings:
     check-exported: false
 
   unused:
-    # treat code as a program (not a library) and report unused exported identifiers; default is false.
-    # XXX: if you enable this setting, unused will report a lot of false-positives in text editors:
-    # if it's called for subdir of a project it can't find funcs usages. All text editor integrations
-    # with golangci-lint call it on a directory with the changed file.
-    check-exported: false
+    # Select the Go version to target. The default is '1.13'.
+    go: "1.15"
 
   whitespace:
     multi-if: false   # Enforces newlines (or comments) after every multi-line if statement
@@ -556,8 +565,8 @@ linters-settings:
     force-short-decl-cuddling: false
     strict-append: true
 
-  # The custom section can be used to define linter plugins to be loaded at runtime. See README doc
-  #  for more info.
+  # The custom section can be used to define linter plugins to be loaded at runtime.
+  # See README doc for more info.
   custom:
     # Each custom linter should have a unique name.
      example:

pkg/config/linters_settings.go

@@ -104,6 +104,7 @@ type LintersSettings struct {
 	GoModDirectives  GoModDirectivesSettings
 	Gomodguard       GoModGuardSettings
 	Gosec            GoSecSettings
+	Gosimple         StaticCheckSettings
 	Govet            GovetSettings
 	Ifshort          IfshortSettings
 	ImportAs         ImportAsSettings
@@ -119,12 +120,14 @@ type LintersSettings struct {
 	Promlinter       PromlinterSettings
 	Revive           ReviveSettings
 	RowsErrCheck     RowsErrCheckSettings
+	Staticcheck      StaticCheckSettings
 	Structcheck      StructCheckSettings
+	Stylecheck       StaticCheckSettings
 	Tagliatelle      TagliatelleSettings
 	Testpackage      TestpackageSettings
 	Thelper          ThelperSettings
 	Unparam          UnparamSettings
-	Unused           UnusedSettings
+	Unused           StaticCheckSettings
 	Varcheck         VarCheckSettings
 	Whitespace       WhitespaceSettings
 	WSL              WSLSettings
@@ -376,6 +379,10 @@ type RowsErrCheckSettings struct {
 	Packages []string
 }
 
+type StaticCheckSettings struct {
+	GoVersion string `mapstructure:"go"`
+}
+
 type StructCheckSettings struct {
 	CheckExportedFields bool `mapstructure:"exported-fields"`
 }
@@ -414,10 +421,6 @@ type UnparamSettings struct {
 	Algo          string
 }
 
-type UnusedSettings struct {
-	CheckExported bool `mapstructure:"check-exported"`
-}
-
 type VarCheckSettings struct {
 	CheckExportedFields bool `mapstructure:"exported-fields"`
 }

pkg/golinters/gosimple.go

@@ -3,12 +3,12 @@ package golinters
 import (
 	"honnef.co/go/tools/simple"
 
+	"github.com/golangci/golangci-lint/pkg/config"
 	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
 )
 
-func NewGosimple() *goanalysis.Linter {
-	analyzers := analyzersMapToSlice(simple.Analyzers)
-	setAnalyzersGoVersion(analyzers)
+func NewGosimple(settings *config.StaticCheckSettings) *goanalysis.Linter {
+	analyzers := setupStaticCheckAnalyzers(simple.Analyzers, settings)
 
 	return goanalysis.NewLinter(
 		"gosimple",

pkg/golinters/staticcheck.go

@@ -3,12 +3,12 @@ package golinters
 import (
 	"honnef.co/go/tools/staticcheck"
 
+	"github.com/golangci/golangci-lint/pkg/config"
 	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
 )
 
-func NewStaticcheck() *goanalysis.Linter {
-	analyzers := analyzersMapToSlice(staticcheck.Analyzers)
-	setAnalyzersGoVersion(analyzers)
+func NewStaticcheck(settings *config.StaticCheckSettings) *goanalysis.Linter {
+	analyzers := setupStaticCheckAnalyzers(staticcheck.Analyzers, settings)
 
 	return goanalysis.NewLinter(
 		"staticcheck",

pkg/golinters/staticcheck_common.go

@@ -0,0 +1,33 @@
+package golinters
+
+import (
+	"golang.org/x/tools/go/analysis"
+
+	"github.com/golangci/golangci-lint/pkg/config"
+	"github.com/golangci/golangci-lint/pkg/logutils"
+)
+
+var debugf = logutils.Debug("megacheck")
+
+func setupStaticCheckAnalyzers(m map[string]*analysis.Analyzer, settings *config.StaticCheckSettings) []*analysis.Analyzer {
+	var ret []*analysis.Analyzer
+	for _, v := range m {
+		setAnalyzerGoVersion(v, settings)
+		ret = append(ret, v)
+	}
+	return ret
+}
+
+func setAnalyzerGoVersion(a *analysis.Analyzer, settings *config.StaticCheckSettings) {
+	// TODO: uses "1.13" for backward compatibility, but in the future (v2) must be set by using build.Default.ReleaseTags like staticcheck.
+	goVersion := "1.13"
+	if settings != nil && settings.GoVersion != "" {
+		goVersion = settings.GoVersion
+	}
+
+	if v := a.Flags.Lookup("go"); v != nil {
+		if err := v.Value.Set(goVersion); err != nil {
+			debugf("Failed to set go version: %s", err)
+		}
+	}
+}

pkg/golinters/stylecheck.go

@@ -3,12 +3,12 @@ package golinters
 import (
 	"honnef.co/go/tools/stylecheck"
 
+	"github.com/golangci/golangci-lint/pkg/config"
 	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
 )
 
-func NewStylecheck() *goanalysis.Linter {
-	analyzers := analyzersMapToSlice(stylecheck.Analyzers)
-	setAnalyzersGoVersion(analyzers)
+func NewStylecheck(settings *config.StaticCheckSettings) *goanalysis.Linter {
+	analyzers := setupStaticCheckAnalyzers(stylecheck.Analyzers, settings)
 
 	return goanalysis.NewLinter(
 		"stylecheck",

pkg/golinters/unused.go

@@ -7,12 +7,17 @@ import (
 	"golang.org/x/tools/go/analysis"
 	"honnef.co/go/tools/unused"
 
+	"github.com/golangci/golangci-lint/pkg/config"
 	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
 	"github.com/golangci/golangci-lint/pkg/lint/linter"
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
-func NewUnused() *goanalysis.Linter {
+type UnusedSettings struct {
+	GoVersion string
+}
+
+func NewUnused(settings *config.StaticCheckSettings) *goanalysis.Linter {
 	const name = "unused"
 
 	var mu sync.Mutex
@@ -49,13 +54,12 @@ func NewUnused() *goanalysis.Linter {
 		},
 	}
 
-	analyzers := []*analysis.Analyzer{analyzer}
-	setAnalyzersGoVersion(analyzers)
+	setAnalyzerGoVersion(analyzer, settings)
 
 	lnt := goanalysis.NewLinter(
 		name,
 		"Checks Go code for unused constants, variables, functions and types",
-		analyzers,
+		[]*analysis.Analyzer{analyzer},
 		nil,
 	).WithIssuesReporter(func(lintCtx *linter.Context) []goanalysis.Issue {
 		return resIssues

pkg/lint/lintersdb/manager.go

@@ -113,6 +113,10 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 	var goModDirectivesCfg *config.GoModDirectivesSettings
 	var tagliatelleCfg *config.TagliatelleSettings
 	var gosecCfg *config.GoSecSettings
+	var gosimpleCfg *config.StaticCheckSettings
+	var staticcheckCfg *config.StaticCheckSettings
+	var stylecheckCfg *config.StaticCheckSettings
+	var unusedCfg *config.StaticCheckSettings
 
 	if m.cfg != nil {
 		govetCfg = &m.cfg.LintersSettings.Govet
@@ -129,6 +133,10 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 		goModDirectivesCfg = &m.cfg.LintersSettings.GoModDirectives
 		tagliatelleCfg = &m.cfg.LintersSettings.Tagliatelle
 		gosecCfg = &m.cfg.LintersSettings.Gosec
+		gosimpleCfg = &m.cfg.LintersSettings.Gosimple
+		staticcheckCfg = &m.cfg.LintersSettings.Staticcheck
+		stylecheckCfg = &m.cfg.LintersSettings.Stylecheck
+		unusedCfg = &m.cfg.LintersSettings.Unused
 	}
 
 	const megacheckName = "megacheck"
@@ -166,28 +174,28 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 			WithPresets(linter.PresetBugs, linter.PresetSQL).
 			WithURL("https://github.com/jingyugao/rowserrcheck"),
 
-		linter.NewConfig(golinters.NewStaticcheck()).
+		linter.NewConfig(golinters.NewStaticcheck(staticcheckCfg)).
 			WithSince("v1.0.0").
 			WithLoadForGoAnalysis().
 			WithPresets(linter.PresetBugs, linter.PresetMetaLinter).
 			WithAlternativeNames(megacheckName).
 			WithURL("https://staticcheck.io/"),
-		linter.NewConfig(golinters.NewUnused()).
+		linter.NewConfig(golinters.NewUnused(unusedCfg)).
 			WithSince("v1.20.0").
 			WithLoadForGoAnalysis().
 			WithPresets(linter.PresetUnused).
 			WithAlternativeNames(megacheckName).
 			ConsiderSlow().
 			WithChangeTypes().
 			WithURL("https://github.com/dominikh/go-tools/tree/master/unused"),
-		linter.NewConfig(golinters.NewGosimple()).
+		linter.NewConfig(golinters.NewGosimple(gosimpleCfg)).
 			WithSince("v1.20.0").
 			WithLoadForGoAnalysis().
 			WithPresets(linter.PresetStyle).
 			WithAlternativeNames(megacheckName).
 			WithURL("https://github.com/dominikh/go-tools/tree/master/simple"),
 
-		linter.NewConfig(golinters.NewStylecheck()).
+		linter.NewConfig(golinters.NewStylecheck(stylecheckCfg)).
 			WithSince("v1.20.0").
 			WithLoadForGoAnalysis().
 			WithPresets(linter.PresetStyle).
@@ -499,16 +507,16 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 	}
 
 	enabledByDefault := map[string]bool{
-		golinters.NewGovet(nil).Name():    true,
-		golinters.NewErrcheck().Name():    true,
-		golinters.NewStaticcheck().Name(): true,
-		golinters.NewUnused().Name():      true,
-		golinters.NewGosimple().Name():    true,
-		golinters.NewStructcheck().Name(): true,
-		golinters.NewVarcheck().Name():    true,
-		golinters.NewIneffassign().Name(): true,
-		golinters.NewDeadcode().Name():    true,
-		golinters.NewTypecheck().Name():   true,
+		golinters.NewGovet(nil).Name():                  true,
+		golinters.NewErrcheck().Name():                  true,
+		golinters.NewStaticcheck(staticcheckCfg).Name(): true,
+		golinters.NewUnused(unusedCfg).Name():           true,
+		golinters.NewGosimple(gosimpleCfg).Name():       true,
+		golinters.NewStructcheck().Name():               true,
+		golinters.NewVarcheck().Name():                  true,
+		golinters.NewIneffassign().Name():               true,
+		golinters.NewDeadcode().Name():                  true,
+		golinters.NewTypecheck().Name():                 true,
 	}
 	return enableLinterConfigs(lcs, func(lc *linter.Config) bool {
 		return enabledByDefault[lc.Name()]