commit | 2dee08980c8e3d5d1cac7d3394b207b062da0bf4 | [log] [tgz] |
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author | Nick Desaulniers <ndesaulniers@google.com> | Sun Jan 27 02:54:23 2019 +0000 |
committer | Nick Desaulniers <ndesaulniers@google.com> | Sun Jan 27 02:54:23 2019 +0000 |
tree | 5b7962ccbc5ecbf93bc0b923fc1b5d4eefcadd77 | |
parent | 35ff9b29ba45c2e7ada6c5a279ab9471057aafd7 [diff] |
lld: elf: discard more specific .gnu.linkonce section Summary: lld discards .gnu.linonce.* sections work around a bug in glibc. https://sourceware.org/bugzilla/show_bug.cgi?id=20543 Unfortunately, the Linux kernel uses a section named .gnu.linkonce.this_module to store infomation about kernel modules. The kernel reads data from this section when loading kernel modules, and errors if it fails to find this section. The current behavior of lld discards this section when kernel modules are linked, so kernel modules linked with lld are unloadable by the linux kernel. The Linux kernel should use a comdat section instead of .gnu.linkonce. The minimum version of binutils supported by the kernel supports comdat sections. The kernel is also not relying on the old linkonce behavior; it seems to have chosen a name that contains a deprecated GNU feature. Changing the section name now in the kernel would require all kernel modules to be recompiled to make use of the new section name. Instead, rather than discarding .gnu.linkonce.*, let's discard the more specific section name to continue working around the glibc issue while supporting linking Linux kernel modules. Link: https://github.com/ClangBuiltLinux/linux/issues/329 Reviewers: pcc, espindola Reviewed By: pcc Subscribers: nathanchance, emaste, arichardson, void, srhines Differential Revision: https://reviews.llvm.org/D57294 git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@352302 91177308-0d34-0410-b5e6-96231b3b80d8
This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.
lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.
In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.
It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz
The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.