cmd/go: handle escapes in pkg-config ldflags output

#16455 handled escapes in pkg-config output but only for cflags. The fix
for #41400 left a note that we don't need to parse quotes and unescapes,
but it is still necessary to handle spaces in pkg-config output. As cflags
has already been processed correctly, we apply the same logic to ldflags
here.

Fixes #35262

Change-Id: Id01d422b103780f67f89e99ff1df0d8f51a7a137
GitHub-Last-Rev: c67e5112130fa008397cfd0bc03e1de58201da86
GitHub-Pull-Request: golang/go#58429
Reviewed-on: https://go-review.googlesource.com/c/go/+/466875
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: David Chase <drchase@google.com>

2 files changed, 22 insertions, 3 deletions

diff --git a/src/cmd/go/go_test.go b/src/cmd/go/go_test.go
index ef22499b87..f056ab9a37 100644
--- a/src/cmd/go/go_test.go
+++ b/src/cmd/go/go_test.go
@@ -1616,6 +1616,22 @@ func main() {
 `)
 	tg.setenv("PKG_CONFIG_PATH", tg.path("."))
 	tg.run("run", tg.path("foo.go"))
+
+	// test for ldflags
+	tg.tempFile("bar.pc", `
+Name: bar
+Description: The bar library
+Version: 1.0.0
+Libs: -Wl,-rpath=/path\ with\ spaces/bin
+`)
+	tg.tempFile("bar.go", `package main
+/*
+#cgo pkg-config: bar
+*/
+import "C"
+func main() {}
+`)
+	tg.run("run", tg.path("bar.go"))
 }
 
 func TestListTemplateContextFunction(t *testing.T) {
diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
index 8dde0a9e06..c1476f8757 100644
--- a/src/cmd/go/internal/work/exec.go
+++ b/src/cmd/go/internal/work/exec.go
@@ -1549,9 +1549,12 @@ func (b *Builder) getPkgConfigFlags(p *load.Package) (cflags, ldflags []string,
 			return nil, nil, err
 		}
 		if len(out) > 0 {
-			// NOTE: we don't attempt to parse quotes and unescapes here. pkg-config
-			// is typically used within shell backticks, which treats quotes literally.
-			ldflags = strings.Fields(string(out))
+			// We need to handle path with spaces so that C:/Program\ Files can pass
+			// checkLinkerFlags. Use splitPkgConfigOutput here just like we treat cflags.
+			ldflags, err = splitPkgConfigOutput(out)
+			if err != nil {
+				return nil, nil, err
+			}
 			if err := checkLinkerFlags("LDFLAGS", "pkg-config --libs", ldflags); err != nil {
 				return nil, nil, err
 			}