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redhat-annobin-plugin-select.sh
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#!/usr/bin/sh # This is a script to select which GCC spec file fragment # should be the destination of the redhat-annobin-cc1 symlink. # Author: Nick Clifton <nickc@redhat.com> # Copyright (c) 2021-2022 Red Hat. # # This is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published # by the Free Software Foundation; either version 2, or (at your # option) any later version. # It is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # Usage: # redhat-annobin-plugin-select [script-dir] # # If script-dir is not provided then /usr/lib/rpm/redhat is used # as the location where all of the annobin plugin selection files # can be found. if test "x$1" = "x" ; then rrcdir=/usr/lib/rpm/redhat else rrcdir=$1 fi # Set this variable to non-zero to enable the generation of debugging # messages. debug=0 # Decide which version of the annobin plugin for gcc should be used. # There are two possible versions, one created by the annobin package and one # created by the gcc package. The logic selects the gcc version unless both # have been built by the same version of the compiler. In that case the # annobin version is selected instead. # # The point of all this is that the annobin plugin is very sensitive to # mismatches with the version of gcc that built it. If the plugin is built # by version A of gcc, but then run on version B of gcc, it is possible for # the plugin to misbehave, which then causes problems if gating tests examine # the plugin's output. (This has happened more than once in RHEL...). # # So the plugin is built both by gcc and by the annobin package. This means # that whenever gcc is updated a fresh plugin is built, and the logic below # will select that version. But in order to allow annobin development to # proceed independtently of gcc, the annobin package can also update its # version of the plugin, and the logic will select this new version. # This is where the annobin package stores the information on the version # of gcc that built the annobin plugin. aver=`gcc --print-file-name=plugin`/annobin-plugin-version-info # This is where the gcc package stores its version information. gver=`gcc --print-file-name=rpmver` aplugin=`gcc --print-file-name=plugin`/annobin.so.0.0.0 gplugin=`gcc --print-file-name=plugin`/gcc-annobin.so.0.0.0 # This is the file that needs to be updated when either of those version # files changes. rac1=redhat-annobin-cc1 # This is the GCC spec file fragment that selects the gcc-built version of # the annobin plugin select_gcc=redhat-annobin-select-gcc-built-plugin # This is the GCC spec file fragment that selects the annobin-built version # of the annobin plugin select_annobin=redhat-annobin-select-annobin-built-plugin install_annobin_version=0 install_gcc_version=0 if [ -f $aplugin ] then if [ -f $gplugin ] then if [ $debug -eq 1 ] then echo " redhat-rpm-config: Both plugins exist, checking version information" fi if [ -f $gver ] then if [ -f $aver ] then if [ $debug -eq 1 ] then echo " redhat-rpm-config: Both plugin version files exist - comparing..." fi # Get the first line from the version info files. This is just in # vase there are extra lines in the files. avers=`head --lines=1 $aver` gvers=`head --lines=1 $gver` if [ $debug -eq 1 ] then echo " redhat-rpm-config: Annobin plugin built by gcc $avers" echo " redhat-rpm-config: GCC plugin built by gcc $gvers" fi # If both plugins were built by the same version of gcc then select # the one from the annobin package (in case it is built from newer # sources). If the plugin builder versions differ, select the gcc # built version instead. This assumes that the gcc built version # always matches the installed gcc, which should be true. if [ $avers = $gvers ] then if [ $debug -eq 1 ] then echo " redhat-rpm-config: Both plugins built by the same compiler - using annobin-built plugin" fi install_annobin_version=1 else if [ $debug -eq 1 ] then echo " redhat-rpm-config: Versions differ - using gcc-built plugin" fi install_gcc_version=1 fi else if [ $debug -eq 1 ] then echo " redhat-rpm-config: Annobin version file does not exist, using gcc-built plugin" fi install_gcc_version=1 fi else if [ -f $aver ] then # FIXME: This is suspicious. If the installed GCC does not supports plugins # then enabling the annobin plugin will not work. if [ $debug -eq 1 ] then echo " redhat-rpm-config: GCC plugin version file does not exist, using annobin-built plugin" fi install_annobin_version=1 else if [ $debug -eq 1 ] then echo " redhat-rpm-config: Neither version file exists - playing safe and using gcc-built plugin" echo " redhat-rpm-config: Note: expected to find $aver and/or $gver" fi install_gcc_version=1 fi fi else if [ $debug -eq 1 ] then echo " redhat-rpm-config: Only the annobin plugin exists - using that" fi install_annobin_version=1 fi else if [ -f $gplugin ] then if [ $debug -eq 1 ] then echo " redhat-rpm-config: Only the gcc plugin exists - using that" fi else if [ $debug -eq 1 ] then echo " redhat-rpm-config: Neither plugin exists - playing safe and using gcc-built plugin" echo " redhat-rpm-config: Note: expected to find $aplugin and/or $gplugin" fi fi install_gcc_version=1 fi if [ $install_annobin_version -eq 1 ] then if [ $debug -eq 1 ] then echo " redhat-rpm-config: Installing annobin version of $rac1" fi pushd $rrcdir > /dev/null rm -f $rac1 ln -s $select_annobin "$rac1" popd > /dev/null else if [ $install_gcc_version -eq 1 ] then if [ $debug -eq 1 ] then echo " redhat-rpm-config: Installing gcc version of $rac1" fi pushd $rrcdir > /dev/null rm -f $rac1 ln -s $select_gcc $rac1 popd > /dev/null fi fi