Manual part of copyright year updates.

2025-01-02  Jakub Jelinek  <jakub@redhat.com>

gcc/
	* gcc.cc (process_command): Update copyright notice dates.
	* gcov-dump.cc (print_version): Ditto.
	* gcov.cc (print_version): Ditto.
	* gcov-tool.cc (print_version): Ditto.
	* gengtype.cc (create_file): Ditto.
	* doc/cpp.texi: Bump @copying's copyright year.
	* doc/cppinternals.texi: Ditto.
	* doc/gcc.texi: Ditto.
	* doc/gccint.texi: Ditto.
	* doc/gcov.texi: Ditto.
	* doc/install.texi: Ditto.
	* doc/invoke.texi: Ditto.
gcc/ada/
	* gnat_ugn.texi: Bump @copying's copyright year.
	* gnat_rm.texi: Likewise.
gcc/d/
	* gdc.texi: Bump @copyrights-d year.
gcc/fortran/
	* gfortranspec.cc (lang_specific_driver): Update copyright notice
	dates.
	* gfc-internals.texi: Bump @copying's copyright year.
	* gfortran.texi: Ditto.
	* intrinsic.texi: Ditto.
	* invoke.texi: Ditto.
gcc/go/
	* gccgo.texi: Bump @copyrights-go year.
libgomp/
	* libgomp.texi: Bump @copying's copyright year.
libitm/
	* libitm.texi: Bump @copying's copyright year.
libquadmath/
	* libquadmath.texi: Bump @copying's copyright year.

2024 -> 2025

libquadmath/ChangeLog:

	* libquadmath.texi (M_LOG2Eq, M_LOG10Eq, M_1_PIq,
	M_2_PIq, M_2_SQRTPIq, M_SQRT1_2q): Adjust descriptioni
	of these constants.

My PR114623 change started using soft-fp.h and quad.h for the sqrtq implementation.
Unfortunately, that seems to fail building in some powerpc* configurations, where
TFmode isn't available.
quad.h has:
 #ifndef TFtype
 typedef float TFtype __attribute__ ((mode (TF)));
 #endif
and uses TFtype.  quad.h has:
 /* Define the complex type corresponding to __float128
    ("_Complex __float128" is not allowed) */
 #if (!defined(_ARCH_PPC)) || defined(__LONG_DOUBLE_IEEE128__)
 typedef _Complex float __attribute__((mode(TC))) __complex128;
 #else
 typedef _Complex float __attribute__((mode(KC))) __complex128;
 #endif
with the conditional and KCmode use added during porting of libquadmath
to powerpc*, so I've just defined TFtype for powerpc when __LONG_DOUBLE_IEEE128__
isn't defined; I could define it to float __attribute__ ((mode (KF))) but it
seemed easier to just define it to __float128 which should do the same thing.

2024-08-03  Jakub Jelinek  <jakub@redhat.com>

	PR target/116007
	* math/sqrtq.c (TFtype): For PowerPC without __LONG_DOUBLE_IEEE128__
	define to __float128 before including soft-fp.h and quad.h.

The recent move of libgfortran object files to subdirs and the resulting
breakage of libgfortran.so symbol exports demonstrated how fragile
deriving object and archive names from their libtool counterparts in the
Makefiles is.  Therefore, this patch moves that step into
make_sunver.pl, considerably simplifying the Makefile rules to create
the version scripts.

Bootstrapped without regressions on i386-pc-solaris2.11 and
sparc-sun-solaris2.11, verifying that the version scripts are identical
except for the input filenames.

2024-05-06  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	contrib:
	* make_sunver.pl: Use File::Basename;
	Skip -lLIB args.
	Convert libtool object/archive names to underlying
	objects/archives.

	libatomic:
	* Makefile.am [LIBAT_BUILD_VERSIONED_SHLIB_SUN]
	(libatomic.map-sun): Pass $(libatomic_la_OBJECTS),
	$(libatomic_la_LIBADD) to make_sunver.pl unmodified.
	* Makefile.in: Regenerate.

	libffi:
	* Makefile.am [LIBFFI_BUILD_VERSIONED_SHLIB_SUN] (libffi.map-sun):
	Pass $(libffi_la_OBJECTS), $(libffi_la_LIBADD) to make_sunver.pl
	unmodified.
	* Makefile.in: Regenerate.

	libgfortran:
	* Makefile.am [LIBGFOR_USE_SYMVER_SUN} (gfortran.ver-sun): Pass
	$(libgfortran_la_OBJECTS), $(libgfortran_la_LIBADD) to
	make_sunver.pl unmodified.
	* Makefile.in: Regenerate.

	libgomp:
	* Makefile.am [LIBGOMP_BUILD_VERSIONED_SHLIB_SUN]
	(libgomp.ver-sun): Pass $(libgomp_la_OBJECTS),
	$(libgomp_la_LIBADD) to make_sunver.pl unmodified.
	* Makefile.in: Regenerate.

	libitm:
	* Makefile.am [LIBITM_BUILD_VERSIONED_SHLIB_SUN] (libitm.map-sun):
	Pass $(libitm_la_OBJECTS), $(libitm_la_LIBADD) to make_sunver.pl
	unmodified.
	* Makefile.in: Regenerate.

	libquadmath:
	* Makefile.am [LIBQUAD_USE_SYMVER_SUN] (quadmath.map-sun): Pass
	$(libquadmath_la_OBJECTS), $(libquadmath_la_LIBADD) to
	make_sunver.pl unmodified.
	* Makefile.in: Regenerate.

	libssp:
	* Makefile.am [LIBSSP_USE_SYMVER_SUN] (ssp.map-sun): Pass
	$(libssp_la_OBJECTS), $(libssp_la_LIBADD) to make_sunver.pl
	unmodified.
	* Makefile.in: Regenerate.

	libstdc++-v3:
	* src/Makefile.am [ENABLE_SYMVERS_SUN]
	(libstdc++-symbols.ver-sun): Pass $(libstdc___la_OBJECTS),
	$(libstdc___la_LIBADD) to make_sunver.pl unmodified.
	* src/Makefile.in: Regenerate.

My earlier libquadmath change apparently broke mingw32 build, while on Linux
<bits/endian.h> is included and defines these, on Mingw apparently that isn't
the case, while soft-fp wants a guarantee that sfp-machine.h defines these.

2024-04-09  Jakub Jelinek  <jakub@redhat.com>

	* sfp-machine.h (__LITTLE_ENDIAN, __BIG_ENDIAN, __BYTE_ORDER): Define
	if __BYTE_ORDER isn't defined.

sqrt should be 0.5ulp precise, but the current implementation is less
precise than that.
The following patch uses the soft-fp code (like e.g. glibc for x86) for it
if possible.  I didn't want to replicate the libgcc infrastructure for
choosing the right sfp-machine.h, so the patch just uses a single generic
implementation.  As the code is used solely for the finite positive arguments,
it shouldn't generate NaNs (so the exact form of canonical QNaN/SNaN is
irrelevant), and sqrt for these shouldn't produce underflows/overflows either,
for < 1.0 arguments it always returns larger values than the argument and for
> 1.0 smaller values than the argument.

2024-04-09  Jakub Jelinek  <jakub@redhat.com>

	PR libquadmath/114623
	* sfp-machine.h: New file.
	* math/sqrtq.c: Include from libgcc/soft-fp also soft-fp.h and quad.h
	if possible.
	(USE_SOFT_FP): Define in that case.
	(sqrtq): Use soft-fp based implementation for the finite positive
	arguments if possible.

With the register_printf_type/register_printf_modifier/register_printf_specifier
APIs the C library is just told the size of the argument and is provided with
a callback to fetch the argument from va_list using va_arg into C library provided
memory.  The C library isn't told what alignment requirement it has, but we were
using direct load of a __float128 value from that memory which assumes
__alignof (__float128) alignment.

The following patch fixes that by using memcpy instead.

I haven't been able to reproduce an actual crash, tried
 #include <quadmath.h>
 #include <stdlib.h>
 #include <stdio.h>

int main ()
{
  __float128 r;
  int prec = 20;
  int width = 46;
  char buf[128];

  r = 2.0q;
  r = sqrtq (r);
  int n = quadmath_snprintf (buf, sizeof buf, "%+-#*.20Qe", width, r);
  if ((size_t) n < sizeof buf)
    printf ("%s\n", buf);
    /* Prints: +1.41421356237309504880e+00 */
  quadmath_snprintf (buf, sizeof buf, "%Qa", r);
  if ((size_t) n < sizeof buf)
    printf ("%s\n", buf);
    /* Prints: 0x1.6a09e667f3bcc908b2fb1366ea96p+0 */
  n = quadmath_snprintf (NULL, 0, "%+-#46.*Qe", prec, r);
  if (n > -1)
    {
      char *str = malloc (n + 1);
      if (str)
        {
          quadmath_snprintf (str, n + 1, "%+-#46.*Qe", prec, r);
          printf ("%s\n", str);
          /* Prints: +1.41421356237309504880e+00 */
        }
      free (str);
    }
  printf ("%+-#*.20Qe\n", width, r);
  printf ("%Qa\n", r);
  printf ("%+-#46.*Qe\n", prec, r);
  printf ("%d %Qe %d %Qe %d %Qe\n", 1, r, 2, r, 3, r);
  return 0;
}
In any case, I think memcpy for loading from it is right.

2024-04-03  Simon Chopin  <simon.chopin@canonical.com>
	    Jakub Jelinek  <jakub@redhat.com>

	PR libquadmath/114533
	* printf/printf_fp.c (__quadmath_printf_fp): Use memcpy to copy
	__float128 out of args.
	* printf/printf_fphex.c (__quadmath_printf_fphex): Likewise.

Signed-off-by: Simon Chopin <simon.chopin@canonical.com>

Manual part of copyright year updates.

2024-01-03  Jakub Jelinek  <jakub@redhat.com>

gcc/
	* gcc.cc (process_command): Update copyright notice dates.
	* gcov-dump.cc (print_version): Ditto.
	* gcov.cc (print_version): Ditto.
	* gcov-tool.cc (print_version): Ditto.
	* gengtype.cc (create_file): Ditto.
	* doc/cpp.texi: Bump @copying's copyright year.
	* doc/cppinternals.texi: Ditto.
	* doc/gcc.texi: Ditto.
	* doc/gccint.texi: Ditto.
	* doc/gcov.texi: Ditto.
	* doc/install.texi: Ditto.
	* doc/invoke.texi: Ditto.
gcc/ada/
	* gnat_ugn.texi: Bump @copying's copyright year.
	* gnat_rm.texi: Likewise.
gcc/d/
	* gdc.texi: Bump @copyrights-d year.
gcc/fortran/
	* gfortranspec.cc (lang_specific_driver): Update copyright notice
	dates.
	* gfc-internals.texi: Bump @copying's copyright year.
	* gfortran.texi: Ditto.
	* intrinsic.texi: Ditto.
	* invoke.texi: Ditto.
gcc/go/
	* gccgo.texi: Bump @copyrights-go year.
libgomp/
	* libgomp.texi: Bump @copying's copyright year.
libitm/
	* libitm.texi: Bump @copying's copyright year.
libquadmath/
	* libquadmath.texi: Bump @copying's copyright year.

2023 -> 2024

While investigating possible race conditions in the GCC testsuites
caused by bufferization issues, I wanted to investigate workarounds
similar to GDB's READ1 [1], and I noticed it was not always possible
to override EXPECT when running 'make check'.

This patch adds the missing support in various Makefiles.

I was not able to test the patch for all the libraries updated here,
but I confirmed it works as intended/needed for libstdc++.

libatomic, libitm, libgomp already work as intended because their
Makefiles do not have:
MAKEOVERRIDES=

Tested on (native) aarch64-linux-gnu, confirmed the patch introduces
the behaviour I want in gcc, g++, gfortran and libstdc++.

I updated (but could not test) libgm2, libphobos, libquadmath and
libssp for consistency since their Makefiles have MAKEOVERRIDES=

libffi, libgo, libsanitizer seem to need a similar update, but they
are imported from their respective upstream repo, so should not be
patched here.

[1] https://github.com/bminor/binutils-gdb/blob/master/gdb/testsuite/README#L269

2023-12-21  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/
	* Makefile.in: Allow overriding EXEPCT.

	libgm2/
	* Makefile.am: Allow overriding EXEPCT.
	* Makefile.in: Regenerate.

	libphobos/
	* Makefile.am: Allow overriding EXEPCT.
	* Makefile.in: Regenerate.

	libquadmath/
	* Makefile.am: Allow overriding EXEPCT.
	* Makefile.in: Regenerate.

	libssp/
	* Makefile.am: Allow overriding EXEPCT.
	* Makefile.in: Regenerate.

	libstdc++-v3/
	* Makefile.am: Allow overriding EXEPCT.
	* Makefile.in: Regenerate.

The r14-4825 change added AC_CHECK_LIBM to libquadmath configure.ac and
replaced unconditional linking with -lm with linking with $(LIBM)
determined by that.
Unfortunately that broke bare metal targets because AC_CHECK_LIBM attempts
to link against -lm and this was after (unconditional) GCC_NO_EXECUTABLES.
Then r14-4863 partially reverted that change (no longer AC_CHECK_LIBM),
but didn't revert the Makefile.am change of -lm to $(LIBM), which had
the effect that libquadmath is not linked against -lm on any arch.
That is a serious problem though e.g. on Linux, because libquadmath calls
a few libm entrypoints and e.g. on powerpc64le the underlinking can cause
crashes in IFUNC resolvers of libm.
Instead of adding further reversion of the r14-4825 commit and use -lm
unconditionally again, this patch adds an AC_CHECK_LIBM like substitutions
with the *-ncr-sysv4.3* target handling removed (I think we don't support
such targets, especially not in libquadmath) and with the default case
replaced by simple using -lm.  That is something in between using -lm
unconditionally and what AC_CHECK_LIBM does if it would work on bare metal
- we know from GCC 13 and earlier that we can link -lm on all targets
libquadmath is built for, and just white list a couple of targets which
we know don't have separate -lm and don't want to link against that
(like Darwin, Cygwin, ...).

2023-12-12  Jakub Jelinek  <jakub@redhat.com>

	PR libquadmath/112963
	* configure.ac (LIBM): Readd AC_CHECK_LIBM-like check without doing
	AC_CHECK_LIB in it.
	* configure: Regenerated.
	* Makefile.in: Regenerated.

This was a rebase error, that managed to pass testing on Darwin and
Linux (but fails on bare metal).

	PR libquadmath/111928

libquadmath/ChangeLog:

	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Remove AC_CHECK_LIBM.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

Recent Darwin versions place contraints on the use of run paths
specified in environment variables.  This breaks some assumptions
in the GCC build.

This change allows the user to configure a Darwin build to use
'@rpath/libraryname.dylib' in library names and then to add an
embedded runpath to executables (and libraries with dependents).

The embedded runpath is added by default unless the user adds
'-nodefaultrpaths' to the link line.

For an installed compiler, it means that any executable built with
that compiler will reference the runtimes installed with the
compiler (equivalent to hard-coding the library path into the name
of the library).

During build-time configurations  any "-B" entries will be added to
the runpath thus the newly-built libraries will be found by exes.

Since the install name is set in libtool, that decision needs to be
available here (but might also cause dependent ones in Makefiles,
so we need to export a conditional).

This facility is not available for Darwin 8 or earlier, however the
existing environment variable runpath does work there.

We default this on for systems where the external DYLD_LIBRARY_PATH
does not work and off for Darwin 8 or earlier.  For systems that can
use either method, if the value is unset, we use the default (which
is currently DYLD_LIBRARY_PATH).

ChangeLog:

	* configure: Regenerate.
	* configure.ac: Do not add default runpaths to GCC exes
	when we are building -static-libstdc++/-static-libgcc (the
	default).
	* libtool.m4: Add 'enable-darwin-at-runpath'.  Act  on the
	enable flag to alter Darwin libraries to use @rpath names.

gcc/ChangeLog:

	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.
	* config/darwin.h: Handle Darwin rpaths.
	* config/darwin.opt: Handle Darwin rpaths.
	* Makefile.in:  Handle Darwin rpaths.

gcc/ada/ChangeLog:

	* gcc-interface/Makefile.in: Handle Darwin rpaths.

gcc/jit/ChangeLog:
	* Make-lang.in: Handle Darwin rpaths.

libatomic/ChangeLog:

	* Makefile.am: Handle Darwin rpaths.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

libbacktrace/ChangeLog:

	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

libcc1/ChangeLog:

	* configure: Regenerate.

libffi/ChangeLog:

	* Makefile.am: Handle Darwin rpaths.
	* Makefile.in: Regenerate.
	* configure: Regenerate.

libgcc/ChangeLog:

	* config/t-slibgcc-darwin: Generate libgcc_s
	with an @rpath name.
	* config.host: Handle Darwin rpaths.

libgfortran/ChangeLog:

	* Makefile.am: Handle Darwin rpaths.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths

libgm2/ChangeLog:

	* Makefile.am: Handle Darwin rpaths.
	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.
	* libm2cor/Makefile.am: Handle Darwin rpaths.
	* libm2cor/Makefile.in: Regenerate.
	* libm2iso/Makefile.am: Handle Darwin rpaths.
	* libm2iso/Makefile.in: Regenerate.
	* libm2log/Makefile.am: Handle Darwin rpaths.
	* libm2log/Makefile.in: Regenerate.
	* libm2min/Makefile.am: Handle Darwin rpaths.
	* libm2min/Makefile.in: Regenerate.
	* libm2pim/Makefile.am: Handle Darwin rpaths.
	* libm2pim/Makefile.in: Regenerate.

libgomp/ChangeLog:

	* Makefile.am: Handle Darwin rpaths.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths

libitm/ChangeLog:

	* Makefile.am: Handle Darwin rpaths.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

libobjc/ChangeLog:

	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

libphobos/ChangeLog:

	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.
	* libdruntime/Makefile.am: Handle Darwin rpaths.
	* libdruntime/Makefile.in: Regenerate.
	* src/Makefile.am: Handle Darwin rpaths.
	* src/Makefile.in: Regenerate.

libquadmath/ChangeLog:

	* Makefile.am: Handle Darwin rpaths.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

libsanitizer/ChangeLog:

	* asan/Makefile.am: Handle Darwin rpaths.
	* asan/Makefile.in: Regenerate.
	* configure: Regenerate.
	* hwasan/Makefile.am: Handle Darwin rpaths.
	* hwasan/Makefile.in: Regenerate.
	* lsan/Makefile.am: Handle Darwin rpaths.
	* lsan/Makefile.in: Regenerate.
	* tsan/Makefile.am: Handle Darwin rpaths.
	* tsan/Makefile.in: Regenerate.
	* ubsan/Makefile.am: Handle Darwin rpaths.
	* ubsan/Makefile.in: Regenerate.

libssp/ChangeLog:

	* Makefile.am: Handle Darwin rpaths.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

libstdc++-v3/ChangeLog:

	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.
	* src/Makefile.am: Handle Darwin rpaths.
	* src/Makefile.in: Regenerate.

libvtv/ChangeLog:

	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

lto-plugin/ChangeLog:
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

zlib/ChangeLog:
	* configure: Regenerate.
	* configure.ac: Handle Darwin rpaths.

This reports common symbols like GNU nm, via a type code of 'C'.

ChangeLog:

	* libtool.m4 (lt_cv_sys_global_symbol_pipe): Augment symcode for
	Solaris 11.

gcc/ChangeLog:

	* configure: Regenerate.

libatomic/ChangeLog:

	* configure: Regenerate.

libbacktrace/ChangeLog:

	* configure: Regenerate.

libcc1/ChangeLog:

	* configure: Regenerate.

libffi/ChangeLog:

	* configure: Regenerate.

libgfortran/ChangeLog:

	* configure: Regenerate.

libgm2/ChangeLog:

	* configure: Regenerate.

libgomp/ChangeLog:

	* configure: Regenerate.

libitm/ChangeLog:

	* configure: Regenerate.

libobjc/ChangeLog:

	* configure: Regenerate.

libphobos/ChangeLog:

	* configure: Regenerate.

libquadmath/ChangeLog:

	* configure: Regenerate.

libsanitizer/ChangeLog:

	* configure: Regenerate.

libssp/ChangeLog:

	* configure: Regenerate.

libstdc++-v3/ChangeLog:

	* configure: Regenerate.

libvtv/ChangeLog:

	* configure: Regenerate.

lto-plugin/ChangeLog:

	* configure: Regenerate.

zlib/ChangeLog:

	* configure: Regenerate.

These are the os support patches we have been grooming and maintaining
for quite a few years over on git.haiku-os.org.  All of these
architectures are working and most have been stable for quite some time.

ChangeLog:

	* configure: Regenerate.
	* configure.ac: Add Haiku to list of ELF OSes
	* libtool.m4: Update sys_lib_dlsearch_path_spec on Haiku.

gcc/ChangeLog:

	* configure: Regenerate.

libatomic/ChangeLog:

	* configure: Regenerate.

libbacktrace/ChangeLog:

	* configure: Regenerate.

libcc1/ChangeLog:

	* configure: Regenerate.

libffi/ChangeLog:

	* configure: Regenerate.

libgfortran/ChangeLog:

	* configure: Regenerate.

libgm2/ChangeLog:

	* configure: Regenerate.

libgomp/ChangeLog:

	* configure: Regenerate.

libitm/ChangeLog:

	* configure: Regenerate.

libobjc/ChangeLog:

	* configure: Regenerate.

libphobos/ChangeLog:

	* configure: Regenerate.

libquadmath/ChangeLog:

	* configure: Regenerate.

libsanitizer/ChangeLog:

	* configure: Regenerate.

libssp/ChangeLog:

	* configure: Regenerate.

libstdc++-v3/ChangeLog:

	* configure: Regenerate.

libvtv/ChangeLog:

	* configure: Regenerate.

lto-plugin/ChangeLog:

	* configure: Regenerate.

zlib/ChangeLog:

	* configure: Regenerate.

My previous nm patch handled all cases but one -- if the user set NM in
the environment to a path which contained an option, libtool's nm
detection tries to run nm against a copy of nm with the options in it:
e.g. if NM was set to "nm --blargle", and nm was found in /usr/bin, the
test would try to run "/usr/bin/nm --blargle /usr/bin/nm --blargle".
This is unlikely to be desirable: in this case we should run
"/usr/bin/nm --blargle /usr/bin/nm".

Furthermore, as part of this nm has to detect when the passed-in $NM
contains a path, and in that case avoid doing a path search itself.
This too was thrown off if an option contained something that looked
like a path, e.g. NM="nm -B../prev-gcc"; libtool then tries to run
"nm -B../prev-gcc nm" which rarely works well (and indeed it looks
to see whether that nm exists, finds it doesn't, and wrongly concludes
that nm -p or whatever does not work).

Fix all of these by clipping all options (defined as everything
including and after the first " -") before deciding whether nm
contains a path (but not using the clipped value for anything else),
and then removing all options from the path-modified nm before
looking to see whether that nm existed.

NM=my-nm now does a path search and runs e.g.
  /usr/bin/my-nm -B /usr/bin/my-nm

NM=/usr/bin/my-nm now avoids a path search and runs e.g.
  /usr/bin/my-nm -B /usr/bin/my-nm

NM="my-nm -p../wombat" now does a path search and runs e.g.
  /usr/bin/my-nm -p../wombat -B /usr/bin/my-nm

NM="../prev-binutils/new-nm -B../prev-gcc" now avoids a path search:
  ../prev-binutils/my-nm -B../prev-gcc -B ../prev-binutils/my-nm

This seems to be all combinations, including those used by GCC bootstrap
(which, before this commit, fails to bootstrap when configured
--with-build-config=bootstrap-lto, because the lto plugin is now using
--export-symbols-regex, which requires libtool to find a working nm,
while also using -B../prev-gcc to point at the lto plugin associated
with the GCC just built.)

Regenerate all affected configure scripts.

ChangeLog:

	* libtool.m4 (LT_PATH_NM): Handle user-specified NM with
	options, including options containing paths.

gcc/ChangeLog:

	* configure: Regenerate.

libatomic/ChangeLog:

	* configure: Regenerate.

libbacktrace/ChangeLog:

	* configure: Regenerate.

libcc1/ChangeLog:

	* configure: Regenerate.

libffi/ChangeLog:

	* configure: Regenerate.

libgfortran/ChangeLog:

	* configure: Regenerate.

libgm2/ChangeLog:

	* configure: Regenerate.

libgomp/ChangeLog:

	* configure: Regenerate.

libitm/ChangeLog:

	* configure: Regenerate.

libobjc/ChangeLog:

	* configure: Regenerate.

libphobos/ChangeLog:

	* configure: Regenerate.

libquadmath/ChangeLog:

	* configure: Regenerate.

libsanitizer/ChangeLog:

	* configure: Regenerate.

libssp/ChangeLog:

	* configure: Regenerate.

libstdc++-v3/ChangeLog:

	* configure: Regenerate.

libvtv/ChangeLog:

	* configure: Regenerate.

lto-plugin/ChangeLog:

	* configure: Regenerate.

zlib/ChangeLog:

	* configure: Regenerate.

Libtool needs to get BSD-format (or MS-format) output out of the system
nm, so that it can scan generated object files for symbol names for
-export-symbols-regex support.  Some nms need specific flags to turn on
BSD-formatted output, so libtool checks for this in its AC_PATH_NM.
Unfortunately the code to do this has a pair of interlocking flaws:

 - it runs the test by doing an nm of /dev/null.  Some platforms
   reasonably refuse to do an nm on a device file, but before now this
   has only been worked around by assuming that the error message has a
   specific textual form emitted by Tru64 nm, and that getting this
   error means this is Tru64 nm and that nm -B would work to produce
   BSD-format output, even though the test never actually got anything
   but an error message out of nm -B.  This is fixable by nm'ing *nm
   itself* (since we necessarily have a path to it).

 - the test is entirely skipped if NM is set in the environment, on the
   grounds that the user has overridden the test: but the user cannot
   reasonably be expected to know that libtool wants not only nm but
   also flags forcing BSD-format output.  Worse yet, one such "user" is
   the top-level Cygnus configure script, which neither tests for
   nor specifies any BSD-format flags.  So platforms needing BSD-format
   flags always fail to set them when run in a Cygnus tree, breaking
   -export-symbols-regex on such platforms.  Libtool also needs to
   augment $LD on some platforms, but this is done unconditionally,
   augmenting whatever the user specified: the nm check should do the
   same.

   One wrinkle: if the user has overridden $NM, a path might have been
   provided: so we use the user-specified path if there was one, and
   otherwise do the path search as usual.  (If the nm specified doesn't
   work, this might lead to a few extra pointless path searches -- but
   the test is going to fail anyway, so that's not a problem.)

(Tested with NM unset, and set to nm, /usr/bin/nm, my-nm where my-nm is a
symlink to /usr/bin/nm on the PATH, and /not-on-the-path/my-nm where
*that* is a symlink to /usr/bin/nm.)

ChangeLog:

	* libtool.m4 (LT_PATH_NM): Try BSDization flags with a user-provided
	NM, if there is one.  Run nm on itself, not on /dev/null, to avoid
	errors from nms that refuse to work on non-regular files.  Remove
	other workarounds for this problem.  Strip out blank lines from the
	nm output.

fixincludes/ChangeLog:

	* configure: Regenerate.

gcc/ChangeLog:

	* configure: Regenerate.

libatomic/ChangeLog:

	* configure: Regenerate.

libbacktrace/ChangeLog:

	* configure: Regenerate.

libcc1/ChangeLog:

	* configure: Regenerate.

libffi/ChangeLog:

	* configure: Regenerate.

libgfortran/ChangeLog:

	* configure: Regenerate.

libgm2/ChangeLog:

	* configure: Regenerate.

libgomp/ChangeLog:

	* configure: Regenerate.

libitm/ChangeLog:

	* configure: Regenerate.

libobjc/ChangeLog:

	* configure: Regenerate.

libphobos/ChangeLog:

	* configure: Regenerate.

libquadmath/ChangeLog:

	* configure: Regenerate.

libsanitizer/ChangeLog:

	* configure: Regenerate.

libssp/ChangeLog:

	* configure: Regenerate.

libstdc++-v3/ChangeLog:

	* configure: Regenerate.

libvtv/ChangeLog:

	* configure: Regenerate.

lto-plugin/ChangeLog:

	* configure: Regenerate.

zlib/ChangeLog:

	* configure: Regenerate.

AR from older binutils doesn't work with --plugin and rc:

[hjl@gnu-cfl-2 bin]$ touch foo.c
[hjl@gnu-cfl-2 bin]$ ar --plugin /usr/libexec/gcc/x86_64-redhat-linux/10/liblto_plugin.so rc libfoo.a foo.c
[hjl@gnu-cfl-2 bin]$ ./ar --plugin /usr/libexec/gcc/x86_64-redhat-linux/10/liblto_plugin.so rc libfoo.a foo.c
./ar: no operation specified
[hjl@gnu-cfl-2 bin]$ ./ar --version
GNU ar (Linux/GNU Binutils) 2.29.51.0.1.20180112
Copyright (C) 2018 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.
[hjl@gnu-cfl-2 bin]$

Check if AR works with --plugin and rc before passing --plugin to AR and
RANLIB.

ChangeLog:

	* configure: Regenerated.
	* libtool.m4 (_LT_CMD_OLD_ARCHIVE): Check if AR works with
	--plugin and rc before enabling --plugin.

config/ChangeLog:

	* gcc-plugin.m4 (GCC_PLUGIN_OPTION): Check if AR works with
	--plugin and rc before enabling --plugin.

gcc/ChangeLog:

	* configure: Regenerate.

libatomic/ChangeLog:

	* configure: Regenerate.

libbacktrace/ChangeLog:

	* configure: Regenerate.

libcc1/ChangeLog:

	* configure: Regenerate.

libffi/ChangeLog:

	* configure: Regenerate.

libgfortran/ChangeLog:

	* configure: Regenerate.

libgm2/ChangeLog:

	* configure: Regenerate.

libgomp/ChangeLog:

	* configure: Regenerate.

libiberty/ChangeLog:

	* configure: Regenerate.

libitm/ChangeLog:

	* configure: Regenerate.

libobjc/ChangeLog:

	* configure: Regenerate.

libphobos/ChangeLog:

	* configure: Regenerate.

libquadmath/ChangeLog:

	* configure: Regenerate.

libsanitizer/ChangeLog:

	* configure: Regenerate.

libssp/ChangeLog:

	* configure: Regenerate.

libstdc++-v3/ChangeLog:

	* configure: Regenerate.

libvtv/ChangeLog:

	* configure: Regenerate.

lto-plugin/ChangeLog:

	* configure: Regenerate.

zlib/ChangeLog:

	* configure: Regenerate.

Sync with binutils for building binutils with LTO:

50ad1254d50 GCC: Pass --plugin to AR and RANLIB

Detect GCC LTO plugin.  Pass --plugin to AR and RANLIB to support LTO
build.

ChangeLog:

	* Makefile.tpl (AR): Add @AR_PLUGIN_OPTION@
	(RANLIB): Add @RANLIB_PLUGIN_OPTION@.
	* configure.ac: Include config/gcc-plugin.m4.
	AC_SUBST AR_PLUGIN_OPTION and RANLIB_PLUGIN_OPTION.
	* libtool.m4 (_LT_CMD_OLD_ARCHIVE): Pass --plugin to AR and
	RANLIB if possible.
	* Makefile.in: Regenerated.
	* configure: Likewise.

config/ChangeLog:

	* gcc-plugin.m4 (GCC_PLUGIN_OPTION): New.

libiberty/ChangeLog:

	* Makefile.in (AR): Add @AR_PLUGIN_OPTION@
	(RANLIB): Add @RANLIB_PLUGIN_OPTION@.
	(configure_deps): Depend on ../config/gcc-plugin.m4.
	* configure.ac: AC_SUBST AR_PLUGIN_OPTION and
	RANLIB_PLUGIN_OPTION.
	* aclocal.m4: Regenerated.
	* configure: Likewise.

zlib/ChangeLog:

	* configure: Regenerated.

gcc/ChangeLog:

	* configure: Regenerate.

libatomic/ChangeLog:

	* configure: Regenerate.

libbacktrace/ChangeLog:

	* configure: Regenerate.

libcc1/ChangeLog:

	* configure: Regenerate.

libffi/ChangeLog:

	* configure: Regenerate.

libgfortran/ChangeLog:

	* configure: Regenerate.

libgm2/ChangeLog:

	* configure: Regenerate.

libgomp/ChangeLog:

	* configure: Regenerate.

libitm/ChangeLog:

	* configure: Regenerate.

libobjc/ChangeLog:

	* configure: Regenerate.

libphobos/ChangeLog:

	* configure: Regenerate.

libquadmath/ChangeLog:

	* configure: Regenerate.

libsanitizer/ChangeLog:

	* configure: Regenerate.

libssp/ChangeLog:

	* configure: Regenerate.

libstdc++-v3/ChangeLog:

	* configure: Regenerate.

libvtv/ChangeLog:

	* configure: Regenerate.

lto-plugin/ChangeLog:

	* configure: Regenerate.

This patch cherry-pickx 8 commits from glibc which fix various strtod_l
bugs.  Additionally, it makes mp_limb_t 64-bit on llp64 targets like
64-bit cygwin.

2023-03-03  niXman  <i.nixman@autistici.org>
	    Jakub Jelinek  <jakub@redhat.com>

	PR libquadmath/87204
	PR libquadmath/94756
	* printf/gmp-impl.h (mp_limb_t, mp_limb_signed_t, BITS_PER_MP_LIMB):
	Use 64-bit limbs on LLP64 targets.
	* strtod/strtod_l.c (round_and_return): Cherry-pick glibc
	9310c284ae9 BZ #16151, 4406c41c1d6 BZ #16965 and fcd6b5ac36a
	BZ #23279 fixes.
	(____STRTOF_INTERNAL): Cherry-pick glibc b0debe14fcf BZ #23007,
	5556d30caee BZ #18247, 09555b9721d and c6aac3bf366 BZ #26137 and
	d84f25c7d87 fixes.

Manual part of copyright year updates.

2023-01-02  Jakub Jelinek  <jakub@redhat.com>

gcc/
	* gcc.cc (process_command): Update copyright notice dates.
	* gcov-dump.cc (print_version): Ditto.
	* gcov.cc (print_version): Ditto.
	* gcov-tool.cc (print_version): Ditto.
	* gengtype.cc (create_file): Ditto.
	* doc/cpp.texi: Bump @copying's copyright year.
	* doc/cppinternals.texi: Ditto.
	* doc/gcc.texi: Ditto.
	* doc/gccint.texi: Ditto.
	* doc/gcov.texi: Ditto.
	* doc/install.texi: Ditto.
	* doc/invoke.texi: Ditto.
gcc/ada/
	* gnat_ugn.texi: Bump @copying's copyright year.
	* gnat_rm.texi: Likewise.
gcc/d/
	* gdc.texi: Bump @copyrights-d year.
gcc/fortran/
	* gfortranspec.cc (lang_specific_driver): Update copyright notice
	dates.
	* gfc-internals.texi: Bump @copying's copyright year.
	* gfortran.texi: Ditto.
	* intrinsic.texi: Ditto.
	* invoke.texi: Ditto.
gcc/go/
	* gccgo.texi: Bump @copyrights-go year.
libgomp/
	* libgomp.texi: Bump @copying's copyright year.
libitm/
	* libitm.texi: Bump @copying's copyright year.
libquadmath/
	* libquadmath.texi: Bump @copying's copyright year.

This reverts commit c63539ff.

This reverts commit 41a45cba.