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Pack relative ELF relocations by default

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Leftover from the Fedora 39 toolchain changes.
This commit is contained in:
Florian Weimer 2024-01-02 16:44:30 +01:00
parent 363ddf0a1c
commit 5fca01af52
3 changed files with 21 additions and 2 deletions
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13
buildflags.md
View File

@ -290,6 +290,16 @@ For example, this can be required if shared objects are used for their
side effects in ELF constructors, or for making them available to
dynamically loaded plugins.
### Switching to legacy relative relocations
By default, ELF objects use the architecture-independent `DT_RELR`
mechanism for relative relocations. To switch to the older,
architecture-specific relocation scheme, add this to the RPM spec file:
%undefine _ld_pack_relocs
This adds `-Wl,-z,pack-relative-relocs` to the linker flags (`LDFLAGS`).
### Specifying the build-id algorithm
If you want to specify a different build-id algorithm for your builds, you
@ -631,6 +641,9 @@ to the compiler driver `gcc`, and not directly to the link editor
for shared objects that actually provide symbols required by the link.
Shared objects which are not needed to fulfill symbol dependencies
are essentially ignored due to this flag.
* `-z pack-relative-relocs`: Use the portable `DT_RELR` scheme for
relative relocations, resulting in reduced startup time compared to
legacy architecture-specific relocations.
* `-z defs`: Refuse to link shared objects (DSOs) with undefined symbols
(optional, see above).

5
macros
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@ -79,7 +79,7 @@
# the flags, while intended for ld, are still passed through the gcc
# compiler driver. At the beginning of %%build, the environment
# variable RPM_LD_FLAGS to this value.
%build_ldflags -Wl,-z,relro %{_ld_as_needed_flags} %{_ld_symbols_flags} %{_hardened_ldflags} %{_annotation_ldflags} %[ "%{toolchain}" == "clang" ? "%{?_clang_extra_ldflags}" : "" ] %{_build_id_flags} %{?_package_note_flags} %{?_distro_extra_ldflags}
%build_ldflags -Wl,-z,relro %{_ld_as_needed_flags} %{_ld_symbols_flags} %{_ld_pack_relocs_flags} %{_hardened_ldflags} %{_annotation_ldflags} %[ "%{toolchain}" == "clang" ? "%{?_clang_extra_ldflags}" : "" ] %{_build_id_flags} %{?_package_note_flags} %{?_distro_extra_ldflags}
# Expands to shell code to set the compiler/linker environment
# variables CFLAGS, CXXFLAGS, FFLAGS, FCFLAGS, VALAFLAGS, LDFLAGS if they
@ -372,6 +372,9 @@ for k,_ in pairs(stripped_flags) do print(k .. " ") end
%_ld_as_needed 1
%_ld_as_needed_flags %{?_ld_as_needed:-Wl,--as-needed}
%_ld_pack_relocs 1
%_ld_pack_relocs_flags %{?_ld_pack_relocs:-Wl,-z,pack-relative-relocs}
# LTO is the default in Fedora.
# "%define _lto_cflags %{nil}" to opt out
#

5
redhat-rpm-config.spec
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@ -4,7 +4,7 @@
# 2) When making changes, increment the version (in baserelease) by 1.
# rpmdev-bumpspec and other tools update the macro below, which is used
# in Version: to get the desired effect.
%global baserelease 272
%global baserelease 273
Summary: Red Hat specific rpm configuration files
Name: redhat-rpm-config
@ -256,6 +256,9 @@ install -p -m 644 -t %{buildroot}%{_rpmluadir}/fedora common.lua
%doc buildflags.md
%changelog
* Tue Jan 2 2024 Florian Weimer <fweimer@redhat.com> - 273-1
- Pack relative ELF relocations by default
* Tue Dec 26 2023 Jan Drögehoff <sentrycraft123@gmail.com> - 272-1
- Add zig-srpm-macros