Always generate PDB for Windows executable

Test: NA
Bug: 350154912
Change-Id: I0a4ebfb62643eb2c8d2b20992e728bcb8b5219a9

cc/builder.go

@@ -22,6 +22,7 @@ import (
 	"fmt"
 	"path/filepath"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 
@@ -910,6 +911,16 @@ func transformObjToDynamicBinary(ctx android.ModuleContext,
 		"ldFlags":       flags.globalLdFlags + " " + flags.localLdFlags,
 		"crtEnd":        strings.Join(crtEnd.Strings(), " "),
 	}
+
+	// On Windows, we always generate a PDB file
+	// --strip-debug is needed to also keep COFF symbols which are needed when
+	// we patch binaries with symbol_inject.
+	if ctx.Windows() {
+		pdb := outputFile.ReplaceExtension(ctx, "pdb")
+		args["ldFlags"] = args["ldFlags"] + " -Wl,--strip-debug -Wl,--pdb=" + pdb.String() + " "
+		implicitOutputs = append(slices.Clone(implicitOutputs), pdb)
+	}
+
 	if ctx.Config().UseRBE() && ctx.Config().IsEnvTrue("RBE_CXX_LINKS") {
 		rule = ldRE
 		args["implicitOutputs"] = strings.Join(implicitOutputs.Strings(), ",")

cc/config/x86_windows_host.go

@@ -43,6 +43,10 @@ var (
 		"-mno-ms-bitfields",
 
 		"--sysroot ${WindowsGccRoot}/${WindowsGccTriple}",
+
+		// Windows flags to generate PDB
+		"-g",
+		"-gcodeview",
 	}
 
 	windowsIncludeFlags = []string{