import redhat-rpm-config-126-1.el8
This commit is contained in:
CentOS Sources
Stepan Oksanichenko
parent
0d9e70a168
commit
00ac4d7fe8
@ -13,6 +13,8 @@ this:
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This will invoke the `./configure` with arguments (such as
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`--prefix=/usr`) to adjust the paths to the packaging defaults.
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Prior to that, some common problems in autotools scripts are
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automatically patched across the source tree.
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As a side effect, this will set the environment variables `CFLAGS`,
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`CXXFLAGS`, `FFLAGS`, `FCFLAGS`, and `LDFLAGS`, so they can be used by
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@ -25,7 +27,8 @@ environment variables using
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%set_build_flags
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early in the `%build` section. (Again, existing environment variables
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are not overwritten.)
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are not overwritten.) `%set_build_flags` does not perform autotools
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script rewriting, unlike `%configure`.
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Individual build flags are also available through RPM macros:
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@ -66,11 +69,24 @@ For other considerations involving shared objects, see:
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* [Fedora Packaging Guidelines: Shared Libraries](https://fedoraproject.org/wiki/Packaging:Guidelines#Shared_Libraries)
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# Customizing compiler flags
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# Customizing compiler and other build flags
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It is possible to set RPM macros to change some aspects of the
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compiler flags. Changing these flags should be used as a last
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recourse if other workarunds are not available.
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recourse if other workarounds are not available.
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### Disable autotools compatibility patching
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By default, the invocation of the `%configure` macro replaces
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`config.guess` files in the source tree with the system version. To
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disable that, define this macro:
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%global _configure_gnuconfig_hack 0
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`%configure` also patches `ltmain.sh` scripts, so that linker flags
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are set as well during libtool-. This can be switched off using:
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%global _configure_libtool_hardening_hack 0
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### Lazy binding
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@ -145,6 +161,63 @@ to the RPM spec file to disable these strict checks. Alternatively,
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you can pass `-z undefs` to ld (written as `-Wl,-z,undefs` on the gcc
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command line). The latter needs binutils 2.29.1-12.fc28 or later.
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### Post-build ELF object processing
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By default, DWARF debugging information is separated from installed
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ELF objects and put into `-debuginfo` subpackages. To disable most
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debuginfo processing (and thus the generation of these subpackages),
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define `_enable_debug_packages` as `0`.
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Processing of debugging information is controlled using the
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`find-debuginfo` tool from the `debugedit` package. Several aspects
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of its operation can be controlled at the RPM level.
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* Creation of `-debuginfo` subpackages is enabled by default.
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To disable, undefine `_debuginfo_subpackages`.
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* Likewise, `-debugsource` subpackages are automatically created.
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To disable, undefine `_debugsource_subpackages`.
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See [Separate Subpackage and Source Debuginfo](https://fedoraproject.org/wiki/Changes/SubpackageAndSourceDebuginfo)
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for background information.
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* `_build_id_links`, `_unique_build_ids`, `_unique_debug_names`,
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`_unique_debug_srcs` control how debugging information and
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corresponding source files are represented on disk.
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See `/usr/lib/rpm/macros` for details. The defaults
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enable parallel installation of `-debuginfo` packages for
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different package versions, as described in
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[Parallel Installable Debuginfo](https://fedoraproject.org/wiki/Changes/ParallelInstallableDebuginfo).
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* By default, a compressed symbol table is preserved in the
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`.gnu_debugdata` section. To disable that, undefine
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`_include_minidebuginfo`.
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* To speed up debuggers, a `.gdb_index` section is created. It can be
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disabled by undefining `_include_gdb_index`.
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* Missing build IDs result in a build failure. To ignore such
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problems, undefine `_missing_build_ids_terminate_build`.
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* During processing, build IDs are recomputed to match the binary
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content. To skip this step, define `_no_recompute_build_ids` as `1`.
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* By default, the options in `_find_debuginfo_dwz_opts` turn on `dwz`
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(DWARF compression) processing. Undefine this macro to disable this
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step.
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* Additional options can be passed by defining the
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`_find_debuginfo_opts` macro.
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After separation of debugging information, additional transformations
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are applied, most of them also related to debugging information.
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These steps can be skipped by undefining the corresponding macros:
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* `__brp_strip`: Removal of leftover debugging information. The tool
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specified by the `__strip` macro is invoked with the `-g` option on
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ELF object (`.o`) files.
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* `__brp_strip_static_archive`: This is similar to `__brp_strip`, but
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processes static `.a` archives instead.
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* `__brp_strip_comment_note`: This step removes unallocated `.note`
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sections, and `.comment` sections from ELF files.
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* `__brp_ldconfig`: For each shared object on the library search path
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whose soname does not match its file name, a symbolic link from the
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soname to the file name is created. This way, these shared objects
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are loadable immediately after installation, even if they are not yet
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listed in the `/etc/ld.so.cache` file (because `ldconfig` has not been
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invoked yet).
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# Individual compiler flags
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Compiler flags end up in the environment variables `CFLAGS`,
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@ -202,6 +275,11 @@ The general (architecture-independent) build flags are:
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variables. (If the address of a variable is never taken, it is not
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possible that a buffer overflow is caused by incorrect pointer
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arithmetic involving a pointer to that variable.)
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* `-fstack-clash-protection`: Turn on instrumentation to avoid
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skipping the guard page in large stack frames. (Without this flag,
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vulnerabilities can result where the stack overlaps with the heap,
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or thread stacks spill into other regions of memory.) This flag is
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fully ABI-compatible and has adds very little run-time overhead.
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* `-grecord-gcc-switches`: Include select GCC command line switches in
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the DWARF debugging information. This is useful for detecting the
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presence of certain build flags and general hardening coverage.
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@ -240,13 +318,6 @@ added by default. This can be switched off by undefining the
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These compiler flags are enabled for all builds (hardened/annotated or
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not), but their selection depends on the architecture:
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* `-fstack-clash-protection`: Turn on instrumentation to avoid
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skipping the guard page in large stack frames. (Without this flag,
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vulnerabilities can result where the stack overlaps with the heap,
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or thread stacks spill into other regions of memory.) This flag is
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fully ABI-compatible and has adds very little run-time overhead, but
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is only available on certain architectures (currently aarch64, i386,
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ppc64, ppc64le, s390x, x86_64).
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* `-fcf-protection`: Instrument binaries to guard against
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ROP/JOP attacks. Used on i686 and x86_64.
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* `-m64` and `-m32`: Some GCC builds support both 32-bit and 64-bit in
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@ -260,24 +331,18 @@ not), but their selection depends on the architecture:
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useful because unwind information is available without having to
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install (and load) debugging ienformation.
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Asynchronous unwind tables are enabled for aarch64, i686, s390x,
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and x86_64. They are not needed on armhfp, ppc64 and ppc64le due
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and x86_64. They are not needed on ppc64le due
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to architectural differences in stack management. On these
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architectures, `-fexceptions` (see above) still enables regular
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unwind tables (or they are enabled by default even without this
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option).
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* `-funwind-tables`: A subset of the unwind information restricted
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to actual call sites. Used on ppc64, ppc64le. Also implied by
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to actual call sites. Used on ppc64le. Also implied by
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`-fexceptions`.
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In addition, `redhat-rpm-config` re-selects the built-in default
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tuning in the `gcc` package. These settings are:
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* **armhfp**: `-march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard`
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selects an Arm subarchitecture based on the ARMv7-A architecture
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with 16 64-bit floating point registers. `-mtune=cortex-8a` selects
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tuning for the Cortex-A8 implementation (while preserving compatibility
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with other ARMv7-A implementations). `-mabi=aapcs-linux` switches to
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the AAPCS ABI for GNU/Linux.
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* **i686**: `-march=x86-64` is used to select a minimum supported
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CPU level matching the baseline for the x86_64 architecture.
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`-mtune=generic` activates tuning for a current blend of CPUs.
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@ -296,7 +361,7 @@ tuning in the `gcc` package. These settings are:
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(z14).
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* **x86_64**: `-mtune=generic` selects tuning which is expected to
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beneficial for a broad range of current CPUs.
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* **ppc64** and **aarch64** do not have any architecture-specific tuning.
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* **aarch64** does not have any architecture-specific tuning.
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# Individual linker flags
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@ -6,7 +6,7 @@
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Summary: Red Hat specific rpm configuration files
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Name: redhat-rpm-config
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Version: 125
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Version: 126
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Release: 1%{?dist}
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# No version specified.
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License: GPL+
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@ -205,6 +205,9 @@ install -p -m 755 %{SOURCE21} %{buildroot}%{_rpmconfigdir}/kabi.sh
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%{_rpmconfigdir}/macros.d/macros.kmp
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%changelog
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* Mon Nov 29 2021 Florian Weimer <fweimer@redhat.com> - 126-1
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- buildflags.md: Documentation updates (#2005079)
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* Fri Nov 27 2020 Florian Festi <ffesti@redhat.com> - 125-1
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- Add missing macros.fedora-misc file (#1874576)
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