Create empty .a on Darwin when there is no obj file.
On Darwin ar would fail if there is no object file to add.
We work around by adding a dummy.o.
Port to Soong of build/ 4aaa1a1fd8e7eb23ac5557cd326d1a48efdb54cd
Change-Id: I68bbebea2726058c25863d7026a645a520d05167
diff --git a/cc/builder.go b/cc/builder.go
index b97f29b..cd12635 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -88,7 +88,7 @@
darwinAppendAr = pctx.StaticRule("darwinAppendAr",
blueprint.RuleParams{
Command: "cp -f ${inAr} ${out}.tmp && ${macArPath} $arFlags ${out}.tmp $in && mv ${out}.tmp ${out}",
- CommandDeps: []string{"${macArPath}"},
+ CommandDeps: []string{"${macArPath}", "${inAr}"},
Description: "ar $out",
},
"arFlags", "inAr")
@@ -120,6 +120,12 @@
},
"args", "crossCompile")
+ emptyFile = pctx.StaticRule("emptyFile",
+ blueprint.RuleParams{
+ Command: "rm -f $out && touch $out",
+ Description: "empty file $out",
+ })
+
copyGccLibPath = pctx.SourcePathVariable("copyGccLibPath", "build/soong/scripts/copygcclib.sh")
copyGccLib = pctx.StaticRule("copyGccLib",
@@ -261,6 +267,37 @@
arFlags := "cqs"
+ if len(objFiles) == 0 {
+ dummy := common.PathForModuleOut(ctx, "dummy" + objectExtension)
+ dummyAr := common.PathForModuleOut(ctx, "dummy" + staticLibraryExtension)
+
+ ctx.ModuleBuild(pctx, common.ModuleBuildParams{
+ Rule: emptyFile,
+ Output: dummy,
+ })
+
+ ctx.ModuleBuild(pctx, common.ModuleBuildParams{
+ Rule: darwinAr,
+ Output: dummyAr,
+ Input: dummy,
+ Args: map[string]string{
+ "arFlags": arFlags,
+ },
+ })
+
+ ctx.ModuleBuild(pctx, common.ModuleBuildParams{
+ Rule: darwinAppendAr,
+ Output: outputPath,
+ Input: dummy,
+ Args: map[string]string{
+ "arFlags": "d",
+ "inAr": dummyAr.String(),
+ },
+ })
+
+ return
+ }
+
// ARG_MAX on darwin is 262144, use half that to be safe
objFilesLists, err := splitListForSize(objFiles.Strings(), 131072)
if err != nil {
@@ -291,7 +328,6 @@
Rule: darwinAppendAr,
Outputs: []string{out},
Inputs: l,
- Implicits: []string{in},
Args: map[string]string{
"arFlags": arFlags,
"inAr": in,