The behaviour is semantically identical, however,
the tool additionally sorts the symbols by address,
compresses frame unwind information more efficiently,
and improves random-accessibility for lazy decompression.
Overall, the changes balance and the output size is same,
however, libunwindstack can access the data much faster
while using less memory (due to the lazy decompression).
It will also enable further improvements in the future.
Bug: 110133331
Test: ART unwinding tests, run prefetto on the device.
Change-Id: Id48f9fe67fb67fcf2b90cc3b217b71bb8f5147ca
The section is stripped from binaries (but preserved in /symbols).
However, is it also unintentionally copied into the minidebuginfo
compressed section, which is included in the final shipped binary.
(This does not affect symtab symbols, which are handled as usual)
Removing it from mini-debug-info shrinks some rust binaries by
up to 10x, saving >10MB on the system partition overall (AOSP).
Test: extract minidebuginfo and check it manually with readelf
Change-Id: I462d81455626bb2b5244e1bf3d5f8b71646f3401
With clang r377782, llvm binutils implements all the necessary
funtionaility for strip.sh. We can finally get rid of all the fallback
GNU binutils usage.
Test: m
Bug: 141010852
Bug: 135627985
Change-Id: I110f6028dab7f599decf59a5cb1b927b35e11857
This allows the compression to be done on multiple threads
and more importantly, it allows libunwindstack to decompress
only the needed blocks, which reduces unwind time and memory.
Bug: 110133331
Test: verify lazy decompression in libunwindstack
Change-Id: Ia3f597928edcbc85acdf05cb5c83ac7fced39148
We rely on a weird, GNU specific behaviour of objcopy:
$ aarch64-linux-android-objcopy -w libgcc.a stripped.a --strip-unneeded-symbol=*
$ llvm-nm --defined-only stripped.a | grep multi
0000000000000000 T __multi3
$ aarch64-linux-android-objcopy -w libgcc.a stripped.a --strip-unneeded-symbol=* --keep-symbol=FOO
$ llvm-nm --defined-only stripped.a | grep multi
llvm-objcopy has a different, more consistent behaviour that does not
mark exported symbols as unneeded when "--keep-symbol" flag exists.
However this behaviour will leave most symbols not deleted in the
libgcc_stripped library.
Revert the change while I'm implementing an alternative solution.
Test: presubmit
Bug: 142585047
Change-Id: I175e811f8a1f6afc6558267fc54e159ad5e12acf
Also fix an issue with deps file introduced in ab5e5142. Now correctly
depends on llvm-readelf insteaf of GNU readelf.
Test: presubmit
Change-Id: Id287e2844626c07917348a62820f8b5edbb22c3d
We had a typo in the original checkin. We need two hypens before
"remove-section" for llvm-strip, just like we have for strip.
Bug: 140721128
Test: Clean build of Go device
Change-Id: Ifb83dc4e6ad8f8070d9ced678f9147d6a040aee7
llvm-objcopy now implements '--regex' option, which allows it to replace
GNU objcopy for creating libgcc_stripped archieve.
Test: build
Bug: 131631155
Change-Id: Ie1733ac8e9b3765f7652a562406dcedb4735cc1a
New strip option named keep_symbols_and_debug_frame, that will keep the
symbols and the .debug_frame. This is meant for use by libc.so only on
arm32. Other libraries might want to use it to keep better unwinding
information on device.
Bug: 132992102
Test: Built libc.so with this option and verified that it contains
Test: the .debug_frame section.
Change-Id: I823a28199dec8316e8b26fe31ff9f17e6b11d406
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
When no-vendor-variant VNDK is enabled, the vendor variant of VNDK
libraries are not installed. Since not all VNDK libraries will be
ready for this, we keep a list of library names in cc/vndk.go to
indicate which libraries must have their vendor variants always
installed regardless of whether no-vendor-variant VNDK is enabled.
Also add --remove-build-id option to the strip script to facilitate
the check of functional identity of the two variants.
Bug: 119423884
Test: Add a dummy VNDK library and build with
TARGET_VNDK_USE_CORE_VARIANT := true, with the corresponding
build/make change.
Change-Id: Ieb1589488690e1cef1e310669a8b47a8b8759dac
... except for Darwin Mach-O, as it is not supported by llvm-strip.
Test: m checkbuild
Bug: 119221035
Change-Id: I021637b6dd3530bff1f563f2ec7c2168e1083b7e
Bug: http://b/122481018
The '-keep' option of llvm-strip has changed to '-keep-section'. Update
scripts/strip.sh accordingly.
Test: Tested on various targets in AOSP and internal branch. Googlers
see http://go/clang-r349610-testing
Change-Id: Ibfc97ecdcdc305c97a4169cead1e1e3cddda9c4c
The intermediate files generated by strip.sh --keep-symbols can be
very large, and are not useful after the build. Remove them once
the final output file has been generated.
Saves ~6GB on an aosp_sailfish-userdebug build.
Test: m checkbuild
Change-Id: I0413f16ac5f423bc1b010cc9b8538f19bdea561e
This also changes over llvm-strip to use the -o flag, rather than
relying on nonstandard (and no longer functional) positional arguments.
Bug: http://b/111998531
Test: Multiple new builds. For googlers - http://go/clang-r339409-testing
Change-Id: I8c82d06304af24a001e6552e36e2f540d8e364ce
Stripping static executables prints a warning:
bash: prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-nm: No such file or directory
The message is harmless, just hide it.
Also turn on pipefail so that the script will exit if the command
returns an error.
Bug: 24409581
Test: m checkbuild
Change-Id: I9647c55c3509e4573e6d4f2f6d88119bdf31e9fb
strip.sh --keep-mini-debug-info matches the default for Make, and
is currently used on lots of files that are not elf files. For
now, just make the behavior match Make and skip files when
strip --strip-all fails.
Bug: 113936524
Test: m checkbuild
Change-Id: I3648c914c0fd7cc9b68aa93fd3cb0b77504d42f6
strip.sh --keep-mini-debug-info had extra $$ escaping from when it
was copied from make.
Bug: 113936524
Test: m checkbuild
Change-Id: I47dec958152584ca94c6149b11a06e64be2f22f9
* Pass LLVM_{OBJCOPY,STRIP} to makefile rules.
* strip.sh is used only in soong-only mode.
It will use llvm-strip and and llvm-objcopy
when --use-llvm-strip is given.
Keep flags of strip.sh in alphabetic order.
* Tested build/soong/scripts/build-ndk-prebuilts.sh
by adding "UseClangLld": true, to soong.variables file.
Bug: 80093681
Test: build/soong/scripts/build-ndk-prebuilts.sh
Change-Id: I612267304eea434c7a33cc086b27b577d5f64094
If there are no symbols to keep (i.e. all function symbols are also in
the dynsym table), then the "${outfile}.keep_symbols" file has size 0.
When objcopy parses a --keep-symbols file, it has a special case for
0-sized files where it silently fails (exits with status 1, no error
message). On the other hand, objcopy is happy with a file containing no
symbols, as long as there is some whitespace or a comment. Avoid the
special case by appending a newline to keep_symbols.
Bug: b/62815515
Bug: b/77242617
Test: manual
Change-Id: I90fd3258426176dc18aa5a8c19389c55fe6329c7
Instead of whichever xz happens to be on the PATH.
Bug: 36130900
Test: prebuilts/build-tools/build-prebuilts.sh
Change-Id: Ic9b66062ca7947f0eca9d839c0864da492d4ef71
Prebuilts may already be stripped. Instead of requiring every stripped
prebuilt to be annotated with LOCAL_STRIP_MODULE := false, just make
the default (mini-debug-info) pass through already-stripped modules
without failing.
Bug: 36793128
Test: manual
Change-Id: I9aec008a867eb7df0fbba82b6dd36605dcbf6b9f
Strip all shared libraries and binaries by default. Use a shell script
to wrap the long sequences of commands needed by some strip variants.
Change-Id: I465bf7cc48330913e60e24762fd55fa2a7731c26
