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