Revert "cmd/go: import runtime/cgo when externally linking"

This reverts CL 477195.

Reason for revert: test fails on darwin and solaris builders.

Change-Id: I68085f06bc84b0b8649804b8968626ed0e788931
Reviewed-on: https://go-review.googlesource.com/c/go/+/477795
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Bypass: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

src/cmd/go/internal/load/pkg.go

@@ -684,15 +684,6 @@ const (
 	// GetTestDeps is for download (part of "go get") and indicates
 	// that test dependencies should be fetched too.
 	GetTestDeps
-
-	// The remainder are internal modes for calls to loadImport.
-
-	// cmdlinePkg is for a package mentioned on the command line.
-	cmdlinePkg
-
-	// cmdlinePkgLiteral is for a package mentioned on the command line
-	// without using any wildcards or meta-patterns.
-	cmdlinePkgLiteral
 )
 
 // LoadImport scans the directory named by path, which must be an import path,
@@ -747,30 +738,18 @@ func loadImport(ctx context.Context, opts PackageOpts, pre *preload, path, srcDi
 		return p
 	}
 
-	setCmdline := func(p *Package) {
-		if mode&cmdlinePkg != 0 {
-			p.Internal.CmdlinePkg = true
-		}
-		if mode&cmdlinePkgLiteral != 0 {
-			p.Internal.CmdlinePkgLiteral = true
-		}
-	}
-
 	importPath := bp.ImportPath
 	p := packageCache[importPath]
 	if p != nil {
 		stk.Push(path)
 		p = reusePackage(p, stk)
 		stk.Pop()
-		setCmdline(p)
 	} else {
 		p = new(Package)
 		p.Internal.Local = build.IsLocalImport(path)
 		p.ImportPath = importPath
 		packageCache[importPath] = p
 
-		setCmdline(p)
-
 		// Load package.
 		// loadPackageData may return bp != nil even if an error occurs,
 		// in order to return partial information.
@@ -2865,15 +2844,15 @@ func PackagesAndErrors(ctx context.Context, opts PackageOpts, patterns []string)
 			if pkg == "" {
 				panic(fmt.Sprintf("ImportPaths returned empty package for pattern %s", m.Pattern()))
 			}
-			mode := cmdlinePkg
+			p := loadImport(ctx, opts, pre, pkg, base.Cwd(), nil, &stk, nil, 0)
+			p.Match = append(p.Match, m.Pattern())
+			p.Internal.CmdlinePkg = true
 			if m.IsLiteral() {
 				// Note: do not set = m.IsLiteral unconditionally
 				// because maybe we'll see p matching both
 				// a literal and also a non-literal pattern.
-				mode |= cmdlinePkgLiteral
+				p.Internal.CmdlinePkgLiteral = true
 			}
-			p := loadImport(ctx, opts, pre, pkg, base.Cwd(), nil, &stk, nil, mode)
-			p.Match = append(p.Match, m.Pattern())
 			if seenPkg[p] {
 				continue
 			}

src/cmd/go/testdata/script/build_static.txt

@@ -1,38 +0,0 @@
-# This test requires external linking. Assume that if cgo is supported
-# then external linking works.
-[!cgo] skip 'links and runs binaries'
-
-# Only run on Unix systems that support -static.
-[GOOS:windows] skip
-[GOOS:plan9] skip
-
-# Ordinary build should work.
-go build
-exec ./hello
-stdout Hello
-
-# Building with -linkmode=external should not say anything about
-# runtime/cgo (issue #31544).
-go build -ldflags=-linkmode=external
-! stderr runtime/cgo
-exec ./hello
-stdout Hello
-
-# Building with -linkmode=external -extldflags=-static should work.
-go build -ldflags='-linkmode=external -extldflags=-static'
-! stderr runtime/cgo
-exec ./hello
-stdout Hello
-
--- go.mod --
-module hello
-
-go 1.20
--- hello.go --
-package main
-
-import "fmt"
-
-func main() {
-	fmt.Println("Hello, world")
-}