Strip libgcc to only keep fallback symbols
We use libgcc as fallback for symbols not present in libclang_rt
builtins, however we didn't know what exact symbols were being used,
some may not be intended to fallback.
Create libgcc_stripped, which only contains unwind symbols from libgcc.
Bug: 29275768
Test: bionic-unit-tests
Change-Id: I5b349fa6138e51663bf3b67109b880b4356da8e8
diff --git a/cc/builder.go b/cc/builder.go
index 7b26d51..c99e461 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -255,6 +255,7 @@
groupStaticLibs bool
stripKeepSymbols bool
+ stripKeepSymbolsList string
stripKeepMiniDebugInfo bool
stripAddGnuDebuglink bool
stripUseGnuStrip bool
@@ -835,6 +836,9 @@
if flags.stripKeepSymbols {
args += " --keep-symbols"
}
+ if flags.stripKeepSymbolsList != "" {
+ args += " -k" + flags.stripKeepSymbolsList
+ }
if flags.stripUseGnuStrip {
args += " --use-gnu-strip"
}
diff --git a/cc/cc_test.go b/cc/cc_test.go
index 05d74b9..f3d5e60 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -1833,13 +1833,13 @@
// Check the shared version of lib2.
variant := "android_arm64_armv8-a_core_shared"
module := ctx.ModuleForTests("lib2", variant).Module().(*Module)
- checkStaticLibs(t, []string{"lib1", "libclang_rt.builtins-aarch64-android", "libatomic", "libgcc"}, module)
+ checkStaticLibs(t, []string{"lib1", "libclang_rt.builtins-aarch64-android", "libatomic", "libgcc_stripped"}, module)
// Check the static version of lib2.
variant = "android_arm64_armv8-a_core_static"
module = ctx.ModuleForTests("lib2", variant).Module().(*Module)
// libc++_static is linked additionally.
- checkStaticLibs(t, []string{"lib1", "libc++_static", "libclang_rt.builtins-aarch64-android", "libatomic", "libgcc"}, module)
+ checkStaticLibs(t, []string{"lib1", "libc++_static", "libclang_rt.builtins-aarch64-android", "libatomic", "libgcc_stripped"}, module)
}
var compilerFlagsTestCases = []struct {
diff --git a/cc/linker.go b/cc/linker.go
index e724df6..986a562 100644
--- a/cc/linker.go
+++ b/cc/linker.go
@@ -228,10 +228,10 @@
// libclang_rt.builtins, libgcc and libatomic have to be last on the command line
if !Bool(linker.Properties.No_libcrt) {
deps.LateStaticLibs = append(deps.LateStaticLibs, config.BuiltinsRuntimeLibrary(ctx.toolchain()))
- }
-
- deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
- if !Bool(linker.Properties.No_libgcc) {
+ deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
+ deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc_stripped")
+ } else if !Bool(linker.Properties.No_libgcc) {
+ deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc")
}
diff --git a/cc/strip.go b/cc/strip.go
index 02397f4..7122585 100644
--- a/cc/strip.go
+++ b/cc/strip.go
@@ -15,15 +15,19 @@
package cc
import (
+ "strings"
+
"android/soong/android"
)
type StripProperties struct {
Strip struct {
- None *bool
- All *bool
- Keep_symbols *bool
- }
+ None *bool `android:"arch_variant"`
+ All *bool `android:"arch_variant"`
+ Keep_symbols *bool `android:"arch_variant"`
+ Keep_symbols_list []string `android:"arch_variant"`
+ Use_gnu_strip *bool `android:"arch_variant"`
+ } `android:"arch_variant"`
}
type stripper struct {
@@ -42,9 +46,14 @@
} else {
if Bool(stripper.StripProperties.Strip.Keep_symbols) {
flags.stripKeepSymbols = true
+ } else if len(stripper.StripProperties.Strip.Keep_symbols_list) > 0 {
+ flags.stripKeepSymbolsList = strings.Join(stripper.StripProperties.Strip.Keep_symbols_list, ",")
} else if !Bool(stripper.StripProperties.Strip.All) {
flags.stripKeepMiniDebugInfo = true
}
+ if Bool(stripper.StripProperties.Strip.Use_gnu_strip) {
+ flags.stripUseGnuStrip = true
+ }
if ctx.Config().Debuggable() && !flags.stripKeepMiniDebugInfo {
flags.stripAddGnuDebuglink = true
}
diff --git a/cc/testing.go b/cc/testing.go
index 2f41de1..8d76c2f 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -69,6 +69,13 @@
src: "",
}
+ toolchain_library {
+ name: "libgcc_stripped",
+ vendor_available: true,
+ recovery_available: true,
+ src: "",
+ }
+
cc_library {
name: "libc",
no_libgcc: true,
diff --git a/cc/toolchain_library.go b/cc/toolchain_library.go
index 6494a26..b4c51ab 100644
--- a/cc/toolchain_library.go
+++ b/cc/toolchain_library.go
@@ -34,6 +34,8 @@
type toolchainLibraryDecorator struct {
*libraryDecorator
+ stripper
+
Properties toolchainLibraryProperties
}
@@ -45,7 +47,7 @@
func (library *toolchainLibraryDecorator) linkerProps() []interface{} {
var props []interface{}
props = append(props, library.libraryDecorator.linkerProps()...)
- return append(props, &library.Properties)
+ return append(props, &library.Properties, &library.stripper.StripProperties)
}
// toolchain_library is used internally by the build tool to link the specified
@@ -78,7 +80,17 @@
return android.PathForSource(ctx, "")
}
- return android.PathForSource(ctx, *library.Properties.Src)
+ srcPath := android.PathForSource(ctx, *library.Properties.Src)
+
+ if library.stripper.StripProperties.Strip.Keep_symbols_list != nil {
+ fileName := ctx.ModuleName() + staticLibraryExtension
+ outputFile := android.PathForModuleOut(ctx, fileName)
+ buildFlags := flagsToBuilderFlags(flags)
+ library.stripper.strip(ctx, srcPath, outputFile, buildFlags)
+ return outputFile
+ }
+
+ return srcPath
}
func (library *toolchainLibraryDecorator) nativeCoverage() bool {