openkylin
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platform_build_soong
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Omit .gnu_debuglink sections in object files 

I'm not sure if these sections are used, but by adding them to
libgcc_stripped.a, we can end up with multiple .gnu_debuglink sections in
an executable, where the first two unhelpfully point at "libgcc.a". e.g.:

$ readelf -SW -x.gnu_debuglink out/target/product/walleye/system/bin/bootstrap/linker64
...

Section Headers:
  ...
  [18] .gnu_debuglink    PROGBITS        0000000000000000 10f19c 000020 00      0   0  1
  ...
  [22] .gnu_debuglink    PROGBITS        0000000000000000 18a2c8 000010 00      0   0  4
  ...

Hex dump of section '.gnu_debuglink':
  0x00000000 6c696267 63632e61 00000000 3d5f65d8 libgcc.a....=_e.
  0x00000010 6c696267 63632e61 00000000 3d5f65d8 libgcc.a....=_e.

Hex dump of section '.gnu_debuglink':
  0x00000000 6c696e6b 65723634 00000000 f85db7ea linker64.....]..

Bug: none
Test: m libgcc_stripped linker
Test: no .gnu_debuglink section in libgcc_stripped.a
Test: only one .gnu_debuglink section in system/bin/bootstrap/linker64
Change-Id: I0c47a9acd6d52f5cbc5bfa8b67d072ebb075a242
This commit is contained in:
Ryan Prichard 2019-05-30 20:53:29 -07:00
parent 7d06395f0c
commit f979d73428
5 changed files with 19 additions and 9 deletions
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4
cc/binary.go
View File

@ -326,7 +326,7 @@ func (binary *binaryDecorator) link(ctx ModuleContext,
}
strippedOutputFile := outputFile
outputFile = android.PathForModuleOut(ctx, "unstripped", fileName)
binary.stripper.strip(ctx, outputFile, strippedOutputFile, builderFlags)
binary.stripper.stripExecutableOrSharedLib(ctx, outputFile, strippedOutputFile, builderFlags)
}
binary.unstrippedOutputFile = outputFile
@ -350,7 +350,7 @@ func (binary *binaryDecorator) link(ctx ModuleContext,
if binary.stripper.needsStrip(ctx) {
out := android.PathForModuleOut(ctx, "versioned-stripped", fileName)
binary.distFile = android.OptionalPathForPath(out)
binary.stripper.strip(ctx, versionedOutputFile, out, builderFlags)
binary.stripper.stripExecutableOrSharedLib(ctx, versionedOutputFile, out, builderFlags)
}
binary.injectVersionSymbol(ctx, outputFile, versionedOutputFile)

4
cc/library.go
View File

@ -721,7 +721,7 @@ func (library *libraryDecorator) linkShared(ctx ModuleContext,
}
strippedOutputFile := outputFile
outputFile = android.PathForModuleOut(ctx, "unstripped", fileName)
library.stripper.strip(ctx, outputFile, strippedOutputFile, builderFlags)
library.stripper.stripExecutableOrSharedLib(ctx, outputFile, strippedOutputFile, builderFlags)
}
library.unstrippedOutputFile = outputFile
@ -738,7 +738,7 @@ func (library *libraryDecorator) linkShared(ctx ModuleContext,
if library.stripper.needsStrip(ctx) {
out := android.PathForModuleOut(ctx, "versioned-stripped", fileName)
library.distFile = android.OptionalPathForPath(out)
library.stripper.strip(ctx, versionedOutputFile, out, builderFlags)
library.stripper.stripExecutableOrSharedLib(ctx, versionedOutputFile, out, builderFlags)
}
library.injectVersionSymbol(ctx, outputFile, versionedOutputFile)

4
cc/prebuilt.go
View File

@ -98,7 +98,7 @@ func (p *prebuiltLibraryLinker) link(ctx ModuleContext,
libName := ctx.baseModuleName() + flags.Toolchain.ShlibSuffix()
if p.needsStrip(ctx) {
stripped := android.PathForModuleOut(ctx, "stripped", libName)
p.strip(ctx, in, stripped, builderFlags)
p.stripExecutableOrSharedLib(ctx, in, stripped, builderFlags)
in = stripped
}
@ -197,7 +197,7 @@ func (p *prebuiltBinaryLinker) link(ctx ModuleContext,
if p.needsStrip(ctx) {
stripped := android.PathForModuleOut(ctx, "stripped", fileName)
p.strip(ctx, in, stripped, builderFlags)
p.stripExecutableOrSharedLib(ctx, in, stripped, builderFlags)
in = stripped
}

14
cc/strip.go
View File

@ -41,7 +41,7 @@ func (stripper *stripper) needsStrip(ctx ModuleContext) bool {
}
func (stripper *stripper) strip(ctx ModuleContext, in android.Path, out android.ModuleOutPath,
flags builderFlags) {
flags builderFlags, isStaticLib bool) {
if ctx.Darwin() {
TransformDarwinStrip(ctx, in, out)
} else {
@ -57,9 +57,19 @@ func (stripper *stripper) strip(ctx ModuleContext, in android.Path, out android.
if Bool(stripper.StripProperties.Strip.Use_gnu_strip) {
flags.stripUseGnuStrip = true
}
if ctx.Config().Debuggable() && !flags.stripKeepMiniDebugInfo {
if ctx.Config().Debuggable() && !flags.stripKeepMiniDebugInfo && !isStaticLib {
flags.stripAddGnuDebuglink = true
}
TransformStrip(ctx, in, out, flags)
}
}
func (stripper *stripper) stripExecutableOrSharedLib(ctx ModuleContext, in android.Path,
out android.ModuleOutPath, flags builderFlags) {
stripper.strip(ctx, in, out, flags, false)
}
func (stripper *stripper) stripStaticLib(ctx ModuleContext, in android.Path, out android.ModuleOutPath,
flags builderFlags) {
stripper.strip(ctx, in, out, flags, true)
}

2
cc/toolchain_library.go
View File

@ -86,7 +86,7 @@ func (library *toolchainLibraryDecorator) link(ctx ModuleContext,
fileName := ctx.ModuleName() + staticLibraryExtension
outputFile := android.PathForModuleOut(ctx, fileName)
buildFlags := flagsToBuilderFlags(flags)
library.stripper.strip(ctx, srcPath, outputFile, buildFlags)
library.stripper.stripStaticLib(ctx, srcPath, outputFile, buildFlags)
return outputFile
}