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=== Context === This patch is part of a patch series to add support for ARMv8-R architecture. Its purpose is to set the feature bits on which to decide what the build attributes should be according to the mode (autodetection, user specified architecture or CPU, or -march/-mcpu=all). === Motivation === Currently, the flags variable which is used to determine the build attribute is constructed from the instruction used (arm_arch_used and thumb_arch_used) as well as the user specified architecture or CPU (selected_cpu). This means when several .arch are specified the resulting feature bits can be such that no architecture provide them all and can thus result in incorrect Tag_CPU_arch. See for instance what having both .arch armv8-a and .arch armv8-m.base would result in. This is not caught by the testsuite because of further bugs in the Tag_CPU_arch build attribute value selection logic (see next patch in the series). === Patch description === As one would expect, this patch solves the problem by setting flags from feature bits used if in autodetection mode [1] and from selected_cpu otherwise. The logic to set arm_ext_v1, arm_ext_v4t and arm_ext_os feature bits is also moved to only run in autodetection mode since otherwise the architecture or CPU would have a consistent set of feature bits already. [1] No architecture or CPU was specified by the user 2017-06-21 Thomas Preud'homme <thomas.preudhomme@arm.com> gas/ * config/tc-arm.c (aeabi_set_public_attributes): Populate flags from feature bits used or selected_cpu depending on whether a CPU was selected by the user.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.