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Roger Sayle 6bb96d13a2 nvptx: Emulate clock and other machine stubs.
This patch to the libc/machine/nvptx port of newlib implements an
approximation of "clock" and provides some additional stub routines.
These changes not only reduce the number of (link) failures in the GCC
testsuite when targeting nvptx-none, but also allow the NIST scimark4
benchmark to compile and run without modification.

newlib already contains support for backends to provide their own
clock implementations via -DCLOCK_PROVIDED.  That functionality is
used here to return an approximate elapsed time based on the NVidia
GPU's clock64 cycle counter.  Although not great, this is better than
the current behaviour of link error from the unresolved symbol
_times_r.

The other part of the patch is to add a small number of stub functions
to nvptx's misc.c.  Adding isatty, for example, resolves linking
problems in libc from the dependency in __smakebuf_r, and the sync
stub, for example, fixes the failure with GCC's
testsuite/gfortran.dg/ISO_Fortran_binding_14.f90 [which simply tests
that gfortran can call a/any C function].

newlib/
        configure.host: Add -DCLOCK_PROVIDED to newlib_cflags on nvptx*.

newlib/libc/machine/nvptx
        Makefile.am: Add clock.c to lib_a_SOURCES.
        clock.c: New source file to implement/approximate clock().
        misc.c: Add stubs for fstat, isatty, open, sync and unlink.
2021-08-25 10:20:27 +02:00
.github/workflows Cygwin: CI configuration update 2021-04-30 14:22:07 +01:00
config
etc
include
libgloss RISC-V: Reliably initialize t0 in _times() 2021-08-04 11:44:33 +02:00
newlib nvptx: Emulate clock and other machine stubs. 2021-08-25 10:20:27 +02:00
texinfo
winsup fix race condition in List_insert 2021-08-23 19:36:10 +02:00
.appveyor.yml Cygwin: Use parallel make on AppVeyor 2021-05-10 16:57:41 +01:00
.gitattributes
.gitignore Cygwin: drop all generated autotools files 2021-04-29 11:16:38 +02:00
COPYING
COPYING.LIB
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COPYING.NEWLIB RTEMS: Add <poll.h> and <sys/poll.h> 2021-01-05 13:41:34 -05:00
COPYING3
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ChangeLog
MAINTAINERS
Makefile.def
Makefile.in Introduce @unless/@endunless and postbootstrap Makefile targets 2018-06-30 00:12:40 -03:00
Makefile.tpl Introduce @unless/@endunless and postbootstrap Makefile targets 2018-06-30 00:12:40 -03:00
README
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config.rpath
config.sub Bump config.guess and config.sub 2021-02-24 11:03:28 +01:00
configure Introduce @unless/@endunless and postbootstrap Makefile targets 2018-06-30 00:12:40 -03:00
configure.ac Introduce @unless/@endunless and postbootstrap Makefile targets 2018-06-30 00:12:40 -03:00
depcomp
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README

		   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.