Create a make variable for all lsdump files.

This is needed so that we can embed the paths of lsdump files in a file,
in order to make lookup faster, while creating reference dumps.

Test: mm -j64 in external/libjpeg-turbo for aosp_arm64_ab;
      out/soong/make_vars-aosp_arm64_ab.mk contains
      SOONG_LSDUMP_PATHS := <list of lsdump paths>

Change-Id: I04608429e1add307cc1ee79d2f0c348fb041613c

cc/builder.go

@@ -687,6 +687,9 @@ func TransformObjToDynamicBinary(ctx android.ModuleContext,
 func TransformDumpToLinkedDump(ctx android.ModuleContext, sAbiDumps android.Paths, soFile android.Path,
 	baseName, exportedHeaderFlags string) android.OptionalPath {
 	outputFile := android.PathForModuleOut(ctx, baseName+".lsdump")
+	sabiLock.Lock()
+	lsdumpPaths = append(lsdumpPaths, outputFile.String())
+	sabiLock.Unlock()
 	symbolFilterStr := "-so " + soFile.String()
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        sAbiLink,

cc/makevars.go

@@ -100,6 +100,9 @@ func makeVarsProvider(ctx android.MakeVarsContext) {
 	ctx.Strict("LLNDK_LIBRARIES", strings.Join(llndkLibraries, " "))
 	ctx.Strict("VNDK_PRIVATE_LIBRARIES", strings.Join(vndkPrivateLibraries, " "))
 
+	sort.Strings(lsdumpPaths)
+	ctx.Strict("LSDUMP_PATHS", strings.Join(lsdumpPaths, " "))
+
 	ctx.Strict("ANDROID_WARNING_ALLOWED_PROJECTS", makeStringOfWarningAllowedProjects())
 	ctx.Strict("SOONG_MODULES_ADDED_WALL", makeStringOfKeys(ctx, modulesAddedWall))
 	ctx.Strict("SOONG_MODULES_USING_WNO_ERROR", makeStringOfKeys(ctx, modulesUsingWnoError))

cc/sabi.go

@@ -16,11 +16,17 @@ package cc
 
 import (
 	"strings"
+	"sync"
 
 	"android/soong/android"
 	"android/soong/cc/config"
 )
 
+var (
+	lsdumpPaths []string
+	sabiLock    sync.Mutex
+)
+
 type SAbiProperties struct {
 	CreateSAbiDumps        bool `blueprint:"mutated"`
 	ReexportedIncludeFlags []string