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Accepting request 1192095 from devel:tools:compiler

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- Update to version 2.33.0
  * mold gained a new linker flag --separate-debug-info to bundle debug info
    sections into a separate file instead of putting them into a main output file.
    You can optionally specify a filename in the form of
    --separate-debug-info=<filename>. By default, a debug info file is created in
    the same directory as the main output file with the .dbg extension. mold embeds
    the debug file's filename into the main output file so that gdb can
    automatically follow the link to find debug info when debugging the main output
    file.
  * The main objective of this flag is to speed up the mold linker even more. By
    default, mold creates a separate debug file in the background after creating a
    main output file, so that you can start running the executable as soon as
    possible while mold is still working on linking its debug info sections. For
    example, linking clang with debug info normally takes ~1.70s on a Threadripper
    7980X machine, while it takes only ~0.52s with --separate-debug-info. Shaving
    off a full second in quick edit-rebuild-run cycles should improve programmers'
    productivity. If you do not want mold to work in the background, pass the
    --no-detach option. (596ffa9)
  * mold now supports the --no-allow-shlib-undefined flag. If the option is given,
    mold checks if all undefined symbols are resolved not only for input object
    files but also for shared libraries passed to the linker. To use the feature,
    you need to pass all shared libraries, including transitively dependent ones, to
    the linker so that the linker can resolve all symbols that are available at
    runtime. (3001f02)
  * mold gained the --dynamic-list-data flag for the sake of compatibility with GNU
    ld. If the flag is given, all data symbols are exported as dynamic symbols.
    (dd8d971)
  * [x86-64] -z x86-64-v2, -z x86-64-v3, -z x86-64-v4 flags are supported. (5606087)
  * [x86-64] Recent x86-64 processors support Intel CET to protect control flow
    integrity. When the feature is enabled, the instruction that is executed

OBS-URL: https://build.opensuse.org/request/show/1192095
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/mold?expand=0&rev=46
This commit is contained in:
Dominique Leuenberger 2024-08-08 08:57:35 +00:00 committed by Git OBS Bridge
commit 7786356f4a
4 changed files with 72 additions and 4 deletions
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3
mold-2.32.1.tar.gz
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size 10010384

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mold-2.33.0.tar.gz Normal file
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size 10061838

68
mold.changes
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@ -1,3 +1,71 @@
-------------------------------------------------------------------
Wed Aug 7 06:37:53 UTC 2024 - Martin Liška <martin.liska@hey.com>
- Update to version 2.33.0
* mold gained a new linker flag --separate-debug-info to bundle debug info
sections into a separate file instead of putting them into a main output file.
You can optionally specify a filename in the form of
--separate-debug-info=<filename>. By default, a debug info file is created in
the same directory as the main output file with the .dbg extension. mold embeds
the debug file's filename into the main output file so that gdb can
automatically follow the link to find debug info when debugging the main output
file.
* The main objective of this flag is to speed up the mold linker even more. By
default, mold creates a separate debug file in the background after creating a
main output file, so that you can start running the executable as soon as
possible while mold is still working on linking its debug info sections. For
example, linking clang with debug info normally takes ~1.70s on a Threadripper
7980X machine, while it takes only ~0.52s with --separate-debug-info. Shaving
off a full second in quick edit-rebuild-run cycles should improve programmers'
productivity. If you do not want mold to work in the background, pass the
--no-detach option. (596ffa9)
* mold now supports the --no-allow-shlib-undefined flag. If the option is given,
mold checks if all undefined symbols are resolved not only for input object
files but also for shared libraries passed to the linker. To use the feature,
you need to pass all shared libraries, including transitively dependent ones, to
the linker so that the linker can resolve all symbols that are available at
runtime. (3001f02)
* mold gained the --dynamic-list-data flag for the sake of compatibility with GNU
ld. If the flag is given, all data symbols are exported as dynamic symbols.
(dd8d971)
* [x86-64] -z x86-64-v2, -z x86-64-v3, -z x86-64-v4 flags are supported. (5606087)
* [x86-64] Recent x86-64 processors support Intel CET to protect control flow
integrity. When the feature is enabled, the instruction that is executed
immediately after an indirect branch must be endbr64 or a CPU fault will raise.
In other words, it restricts the locations where the control can transfer to
with indirect branches. Doing that makes ROP attacks harder to conduct.
* A problem with that is the compiler needs to conservatively emit an endbr64 at
the beginning of each global function because the compiler doesn't know whether
or not the function's address is taken in other translation units. As a result,
the resulting binary contains more endbr64s than necessary, weakening the
protection.
* mold supports the -z rewrite-endbr option to conduct a whole program analysis
and rewrite endbr64 with nop if a function's address is not actually taken
within the program. Previously, mold didn't take section symbols into account
when conducting the analysis, which resulted in culling some endbr64s that must
not be removed. Now, the bug has been fixed. We confirmed that mold can build
itself with -z rewrite-endbr, and the resulting mold executable works fine with
Intel CET. (ed7eec5)
* mold now creates a .eh_frame section even if it's empty. (14a4b05)
* [LoongArch] The following relocations are now supported: R_LARCH_TLS_LE_HI20_R,
R_LARCH_TLS_LE_ADD_R, R_LARCH_TLS_LE_LO12_R, R_LARCH_CALL36, R_LARCH_RELAX
(36e5b4b, 98a7cff, 2c6f379)
* [LoongArch] Some relaxations that reduce the section size are now supported.
(74b359f, 121f917)
* [LoongArch] Range extension thunk support has been removed in favor of
R_LARCH_CALL36 relocations. (47c092a)
-------------------------------------------------------------------
Thu Jun 27 06:56:15 UTC 2024 - Martin Liška <martin.liska@hey.com>

2
mold.spec
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@ -17,7 +17,7 @@
Name: mold
Version: 2.32.1
Version: 2.33.0
Release: 0
Summary: A Modern Linker (mold)
License: MIT