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ELF: Add --strip-debug option. 

If --strip-debug option is given, then all sections whose names start
with ".debug" are removed from output.

llvm-svn: 265722
This commit is contained in:
Rui Ueyama 2016-04-07 21:04:51 +00:00
parent 07334f05de
commit fc6a4b045f
5 changed files with 41 additions and 3 deletions
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1
lld/ELF/Config.h
View File

@ -79,6 +79,7 @@ struct Configuration {
bool Shared;
bool Static = false;
bool StripAll;
bool StripDebug;
bool SysvHash = true;
bool Threads;
bool Trace;

10
lld/ELF/Driver.cpp
View File

@ -291,6 +291,7 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
Config->SaveTemps = Args.hasArg(OPT_save_temps);
Config->Shared = Args.hasArg(OPT_shared);
Config->StripAll = Args.hasArg(OPT_strip_all);
Config->StripDebug = Args.hasArg(OPT_strip_debug);
Config->Threads = Args.hasArg(OPT_threads);
Config->Trace = Args.hasArg(OPT_trace);
Config->Verbose = Args.hasArg(OPT_verbose);
@ -315,11 +316,16 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
Config->ZOrigin = hasZOption(Args, "origin");
Config->ZRelro = !hasZOption(Args, "norelro");
Config->Pic = Config->Pie || Config->Shared;
if (Config->Relocatable)
Config->StripAll = false;
// --strip-all implies --strip-debug.
if (Config->StripAll)
Config->StripDebug = true;
// Config->Pic is true if we are generating position-independent code.
Config->Pic = Config->Pie || Config->Shared;
if (auto *Arg = Args.getLastArg(OPT_hash_style)) {
StringRef S = Arg->getValue();
if (S == "gnu") {

7
lld/ELF/InputFiles.cpp
View File

@ -262,8 +262,13 @@ elf::ObjectFile<ELFT>::createInputSection(const Elf_Shdr &Sec) {
if (Name == ".note.GNU-stack")
return &InputSection<ELFT>::Discarded;
if (Name == ".note.GNU-split-stack")
if (Name == ".note.GNU-split-stack") {
error("objects using splitstacks are not supported");
return &InputSection<ELFT>::Discarded;
}
if (Config->StripDebug && Name.startswith(".debug"))
return &InputSection<ELFT>::Discarded;
// A MIPS object file has a special section that contains register
// usage info, which needs to be handled by the linker specially.

3
lld/ELF/Options.td
View File

@ -133,6 +133,9 @@ def start_lib : Flag<["--"], "start-lib">,
def strip_all : Flag<["--"], "strip-all">,
HelpText<"Strip all symbols">;
def strip_debug : Flag<["--"], "strip-debug">,
HelpText<"Strip debugging information">;
def sysroot : Joined<["--"], "sysroot=">,
HelpText<"Set the system root">;

23
lld/test/ELF/strip-debug.s Normal file
View File

@ -0,0 +1,23 @@
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux -g %s -o %t
# RUN: ld.lld %t -o %t2
# RUN: llvm-readobj -sections -symbols %t2 | FileCheck -check-prefix=DEFAULT %s
# RUN: ld.lld %t -o %t2 --strip-debug
# RUN: llvm-readobj -sections -symbols %t2 | FileCheck -check-prefix=STRIP %s
# RUN: ld.lld %t -o %t2 --strip-all
# RUN: llvm-readobj -sections -symbols %t2 | FileCheck -check-prefix=STRIP %s
# DEFAULT: Name: .debug_info
# DEFAULT: Name: .debug_abbrev
# DEFAULT: Name: .debug_aranges
# DEFAULT: Name: .debug_line
# STRIP-NOT: Name: .debug_info
# STRIP-NOT: Name: .debug_abbrev
# STRIP-NOT: Name: .debug_aranges
# STRIP-NOT: Name: .debug_line
.globl _start
_start:
ret