This single-@item @table is better defined with @deftypevr, since the
CHAR_BIT macro has @standards (being declared in a header), and @items
in @tables are not considered annotatable. Using @deftypevr
automatically includes the macro in the Variable and Constant Macro
Index and ensures its inclusion the Summary of Library Facilities.
@deftypevr is used to record the type of the macro so that it also
appears in the Summary.
The description is updated to mention a later POSIX requirement that
this macro have the value 8.
* manual/lang.texi (CHAR_BIT): Convert from an @table to an
@deftypevr. Change standard from ISO to C90. Mention the
POSIX.1-2001 requirement of the value 8.
The Summary is now generated from @standards, and syntax-checking is
performed. If invalid @standards syntax is detected, summary.pl will
fail, reporting all errors. Failure and error reporting is disabled
for now, however, since much of the manual is still incomplete
wrt. header and standards annotations.
Note that the sorting order of the Summary has changed; summary.pl
respects the locale, like summary.awk did, but the use of LC_ALL=C is
introduced in the Makefile. Other notable deviations are improved
detection of the annotated elements' names, which are used for
sorting, and improved detection of the @node used to reference into
the manual. The most noticeable difference in the rendered Summary is
that entries may now contain multiple lines, one for each header and
standard combination.
summary.pl accepts a `--help' option, which details the expected
syntax of @standards. If errors are reported, the user is directed to
this feature for further information.
* manual/Makefile: Generate summary.texi with summary.pl.
Force use of the C locale. Update Perl dependency comment.
* manual/header.texi: Update reference to summary.awk.
* manual/macros.texi: Refer authors to `summary.pl --help'.
* manual/summary.awk: Remove file.
* manual/summary.pl: New file. Generate summary.texi, and
check for @standards-related syntax errors.
* manual/argp.texi: Convert header and standards @comments to
@standards.
* manual/arith.texi: Likewise.
* manual/charset.texi: Likewise.
* manual/conf.texi: Likewise.
* manual/creature.texi: Likewise.
* manual/crypt.texi: Likewise.
* manual/ctype.texi: Likewise.
* manual/debug.texi: Likewise.
* manual/errno.texi: Likewise.
* manual/filesys.texi: Likewise.
* manual/getopt.texi: Likewise.
* manual/job.texi: Likewise.
* manual/lang.texi: Likewise.
* manual/llio.texi: Likewise.
* manual/locale.texi: Likewise.
* manual/math.texi: Likewise.
* manual/memory.texi: Likewise.
* manual/message.texi: Likewise.
* manual/pattern.texi: Likewise.
* manual/pipe.texi: Likewise.
* manual/process.texi: Likewise.
* manual/resource.texi: Likewise.
* manual/search.texi: Likewise.
* manual/setjmp.texi: Likewise.
* manual/signal.texi: Likewise.
* manual/socket.texi: Likewise.
* manual/startup.texi: Likewise.
* manual/stdio.texi: Likewise.
* manual/string.texi: Likewise.
* manual/sysinfo.texi: Likewise.
* manual/syslog.texi: Likewise.
* manual/terminal.texi: Likewise.
* manual/threads.texi: Likewise.
* manual/time.texi: Likewise.
* manual/users.texi: Likewise.
The conversion script will convert these annotations, but the
replacement Summary-generation script won't catch them because @items
in @tables are not generally considered annotatable, causing them to
be skipped over (or cause errors). Using @vtable ensures their
continued presence in the Summary, with the added benefit that Texinfo
will also automatically include them in the Variable and Constant
Macro index now.
* manual/conf.texi: Convert @tables of annotated @items to
@vtables.
* manual/lang.texi: Likewise.
* manual/pattern.texi: Likewise.
* manual/resource.texi: Likewise.
* manual/socket.texi: Likewise.
TS 18661-1 defines macros for the width of integer types, intended for
use with the fromfp functions to convert from floating-point types to
integer types of any width, in any rounding mode and with control over
whether "inexact" is raised. Such macros are, of course, more
generally useful than just with those functions.
Those macros are added to <limits.h> and <stdint.h>. Having
previously added the <limits.h> macros, this patch adds the <stdint.h>
ones. I've also added these macros to GCC's headers for GCC 7, but
for glibc systems, the definitions in GCC's <stdint.h> will only be
used with -ffreestanding.
Tested for x86_64 and x86.
* sysdeps/generic/stdint.h: Define
__GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION and include
<bits/libc-header-start.h> instead of including <features.h>.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT8_WIDTH): New macro.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT8_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT16_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT16_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT32_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT32_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT64_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT64_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_LEAST8_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_LEAST8_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_LEAST16_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_LEAST16_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_LEAST32_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_LEAST32_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_LEAST64_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_LEAST64_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_FAST8_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_FAST8_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_FAST16_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_FAST16_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_FAST32_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_FAST32_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_FAST64_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_FAST64_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INTPTR_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINTPTR_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INTMAX_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINTMAX_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (PTRDIFF_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (SIG_ATOMIC_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (SIZE_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (WCHAR_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (WINT_WIDTH): Likewise.
* manual/arith.texi (Integers): Document these macros for types
specified by width properties.
* manual/lang.texi (Width of Type): Document these macros for
other standard typedefs.
* stdlib/tst-width-stdint.c: New file.
* stdlib/Makefile (tests): Add tst-width-stdint.
TS 18661-1 defines macros for the width of integer types, intended for
use with the fromfp functions to convert from floating-point types to
integer types of any width, in any rounding mode and with control over
whether "inexact" is raised. Such macros are, of course, more
generally useful than just with those functions.
Those macros are added to <limits.h> and <stdint.h>. This patch adds
the <limits.h> macros to glibc's header, with the <stdint.h> ones
intended to be added in a separate patch (which would add to the NEWS
entry created by this patch). I've also added these macros to GCC's
headers for GCC 7, but definitions in glibc's <limits.h> are still
useful for older GCC, for non-GNU compilers and for when it's
_GNU_SOURCE rather than __STDC_WANT_IEC_60559_BFP_EXT__ that implies
the macros should be defined since the GCC header only considers
__STDC_WANT_IEC_60559_BFP_EXT__ (and for glibc systems, the
definitions in GCC's <stdint.h> will only be used with
-ffreestanding).
Tested for x86_64 and x86.
* include/limits.h: Define
__GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION and include
<bits/libc-header-start.h> instead of including <features.h>.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (CHAR_WIDTH): New macro.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (SCHAR_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UCHAR_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (SHRT_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (USHRT_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (INT_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (UINT_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (LONG_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (ULONG_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (LLONG_WIDTH): Likewise.
[__GLIBC_USE (IEC_60559_BFP_EXT)] (ULLONG_WIDTH): Likewise.
* manual/lang.texi (Width of Type): Document these macros.
* stdlib/tst-width.c: New file.
* stdlib/Makefile (tests): Add tst-width.
* manual/examples/strncat.c: Remove.
This example was misleading, as the code would have undefined
behavior if "hello" was longer than SIZE. Anyway, the manual
shouldn't encourage strncpy+strncat for this sort of thing.
* manual/string.texi (Copying Strings and Arrays): Split into
three sections Copying Strings and Arrays, Concatenating Strings,
and Truncating Strings, as this section was way too long. All
cross-referenced changed. Add advice about string-truncation
functions. Remove misleading strncat example.
2002-05-27 Alexandre Oliva <aoliva@redhat.com>
* configure.in (DO_STATIC_NSS): Define if --disable-shared.
2002-05-26 Bruno Haible <bruno@clisp.org>
* iconvdata/iso-2022-jp.c (BODY for TO_LOOP): Avoid running off the
end of the ISO-8859-7 from idx table.
2002-05-27 Ulrich Drepper <drepper@redhat.com>
* manual/lang.texi: Fix FLT_EPSILON description [PR libc/3649].
2002-05-24 David S. Miller <davem@redhat.com>
* string/bits/string2.h (memset): Do not try to optimize when
not _STRING_ARCH_unaligned if GCC will do the right thing.
1999-06-07 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* sysdeps/unix/sysv/linux/if_index.c: Use SIGIOCGIFINDEX and fix
another SIOGIFNAME typo.
1999-06-07 Ulrich Drepper <drepper@cygnus.com>
* elf/dl-lookup.c: Remove duplicated assert.h inclusion.
* sysdeps/generic/printf_fphex.c (__printf_fphex): Optimize a little
bit.
1999-06-05 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* sysdeps/generic/printf_fphex.c (__printf_fphex): Don't ignore
the precision if the mantissa is zero.
1999-06-05 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* manual/lang.texi (Floating Point Parameters): GCC already
supports long double for a long time.
1999-06-05 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* math/libm-test.c (j0_test, j1_test, jn_test, y0_test, y1_test,
yn_test): Increase some epsilons.
1999-01-11 Ulrich Drepper <drepper@cygnus.com>
* ctype/Versions [GLIBC_2.0]: Export __ctype32_b.
* include/wctype.h: Declare __iswctype.
* stdio-common/vfscanf.c (__vfscanf): Use __iswspace instead of
iswspace.
* wctype/Makefile (routines): Add wcextra_l.
* wctype/wcextra.c (iswblank): Implement function here and don't use
__iswctype.
(__iswblank_l): Move definition to...
* wctype/wcextra_l.c: ...here. New file.
* wctype/wcfuncs.c: Really implement functions and don't call
__iswctype or __towctrans.
* wctype/wctype.h: Change isw* and tow* macros. Don't call
__iswctype or __towctrans. Instead optimize constant argument case.
* iconv/gconv.h: Fix typos.
* iconv/skeleton.c: Fix typos. Optimize init function a bit.
Correctly emit escape sequence to return to initial state in
conversion function.
* iconvdata/iso-2022-jp.c (gconv_init): Correctly initialize
max_needed_to element.
* manual/mbyte.texi: Removed. This is now described in charset.texi.
* manual/charset.texi: New file.
* manual/Makefile (chapters): Replace mbyte by charset.
* manual/ctype.texi: Document wide character functions.
* manual/intro.texi: Fix reference to mbyte chapter.
* manual/lang.texi: Likewise.
* manual/locale.texi: Likewise.
* manual/stdio.texi: Likewise.
* manual/string.texi: Fix @node line for new charset chapter.
* manual/libc.texinfo (UPDATED): Updated. Also update copyright years.
* manual/memory.texi (savestring): Optimize code to give a good
example.
* manual/filesys.texi: Fix wording. Patches by Jim Meyering.
* nscd/nscd_getgr_r.c: Include stdint.h to get uintptr_t definition.
* nscd/nscd_getpw_r.c: Likewise.
* nscd/nscd_gethst_r.c: Likewise.
* stdlib/stdtold_l.c: Always include xlocale.h.
1999-01-11 Geoffrey Keating <geoffk@ozemail.com.au>
* stdlib/fpioconst.h (LDBL_MAX_10_EXP_LOG): Define to be same as
DBL_MAX_10_EXP_LOG if there is no long double.
(_fpioconst_pow10): Always use size as LDBL_MAX_10_EXP_LOG to match
printf_fp.c.
1999-01-10 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* timezone/Makefile ($(testdata)/GB): Changed to ...
($(testdata)/Europe/London): ... for tst-timezone test.
($(objpfx)tst-timezone.out): Change GB to Europe/London.
* timezone/tst-timezone.c (main): Enable DST switching test,
change GB to Europe/London.
1999-01-10 Philip Blundell <philb@gnu.org>
* socket/Makefile (headers): Remove bits/sockunion.h.
1999-01-09 Philip Blundell <philb@gnu.org>
* socket/sys/socket.h: Don't include <bits/sockunion.h>.
* sysdeps/generic/bits/sockunion.h: Deleted.
* sysdeps/unix/sysv/linux/bits/sockunion.h: Likewise.
1999-01-08 H.J. Lu <hjl@gnu.org>
* io/fts.c (fts_close): Don't access memory after having it freed.
1999-01-07 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/i386/bits/select.h (__FD_ZERO): Remove early clobbers
from c and D register output.
1999-01-07 Philip Blundell <philb@gnu.org>
* sysdeps/unix/sysv/linux/arm/sigcontextinfo.h: Fix bug in last change.
1999-01-07 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/alpha/bits/types.h: Correct type for
__fsfilcnt_t. Patch by Bruce Elliott <bde@nwlink.com>.
1999-01-05 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* manual/conf.texi: Remove pointers from first @node. Move old
@node spec inside comment.
* manual/lang.texi: Likewise.
* manual/libc-texinfo.sh: Also find `@node.*Top' in a comment.
* manual/stdio.texi: Fix typo.
1999-01-04 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* wcsmbs/btowc.c: Accept all values in the range [SCHAR_MIN
.. UCHAR_MAX]. Local var buf renamed to result and its type
changed from char[] to wchar_t to get proper alignment.
* posix/fnmatch.c: Also cast the arguments of the other ctype
functions to unsigned char.
1999-01-07 Ulrich Drepper <drepper@cygnus.com>
* Rules: Add rules for empty.{o,os,op} back.
1998-11-16 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/opendir.c: Use o_directory_works differently. Treat
zero value as uninitialized so that variable can go into .bss.
* dirent/opendir-tst1.c: Print error strings to stdout.
* sysdeps/unix/sysv/linux/mmap64.c: New file. Empty.
* sysdeps/unix/sysv/linux/syscalls.list: Add mmap with mmap64 alias.
* sysdeps/unix/sysv/linux/arm/mmap.S: Add mmap64 alias.
* sysdeps/unix/sysv/linux/i386/mmap.S: Likewise.
* sysdeps/unix/sysv/linux/m68k/mmap.S: Likewise.
1998-11-16 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* time/tzfile.c (__tzfile_read): Check that types[i].isdst is in
range.
1998-11-16 Ulrich Drepper <drepper@cygnus.com>
* libio/bits/stdio.h (fread_unlocked): Do handle zero size and number.
(fwrite_unlocked): Likewise.
1998-11-16 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* libio/bits/stdio.h (fread_unlocked): Don't evaluate non-constant
twice. Don't bother handling zero size.
(frwite_unlocked): Likewise.
1998-11-15 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* configure.in: Fix regex for makeinfo version string.
1998-11-15 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* sunrpc/rpc_sample.c (write_sample_server): Avoid -Wparentheses
warning.
* sunrpc/rpc_svcout.c (write_program): Likewise.
1998-11-15 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* time/Makefile (CFLAGS-test_time.c): Add -Wno-format.
1998-11-16 Ulrich Drepper <drepper@cygnus.com
* misc/sys/mman.h: Pretty print prototypes.
1998-11-15 Ulrich Drepper <drepper@cygnus.com
* misc/error.c (error): Don't use result of strerror_r call directly
since at least DEC Unix has a wrong return type.
Patch by Johan Danielsson <joda@pdc.kth.se>.
1998-11-16 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
1998-06-01 Gordon Matzigkeit <gord@profitpress.com>
* hurd/Makefile (routines): Add cthreads.
1998-05-31 Mark Kettenis <kettenis@phys.uva.nl>
* login/login.c (login): Let pututline take care of finding the
positin to insert the UTMP entry. This corrects a bug where ssh
was not reusing UTMP entries marked as DEAD_PROCESS.
Reported by Herbert Xu <herbert@gondor.apana.org.au>.
1998-05-31 Mark Kettenis <kettenis@phys.uva.nl>
* login/Makefile (tests): New variable, add tst-utmp and
tst-utmpx.
* login/tst-utmp.c: New file.
* login/tst-utmpx.c: New file.
1998-06-01 Gordon Matzigkeit <gord@profitpress.com>
* sysdeps/mach/hurd/errlist.c (sys_nerr, _sys_nerr): Make weak
aliases for _hurd_nerr, for programs that don't use sys_errlist,
but need sys_err.
1998-05-31 Mark Kettenis <kettenis@phys.uva.nl>
* sysdeps/generic/updwtmpx.c: Rename function to updwtmpx.
* libc.map: Add updwtmpx and utmpxname to GLIBC_2.1.
1998-05-31 Mark Kettenis <kettenis@phys.uva.nl>
* sysdeps/mach/hurd/read.c: Rename function to __libc_read and
make __read a weak alias. Use ANSI-style function definition.
* sysdeps/mach/hurd/write.c: Likewise.
1998-05-31 Mark Kettenis <kettenis@phys.uva.nl>
* sysdeps/mach/hurd/err_hurd.sub: Use _hurd_errlist instead of
_sys_errlist.
1998-05-30 Mark Kettenis <kettenis@phys.uva.nl>
* sysdeps/mach/hurd/Makefile ($(objpfx)librtld.os):
Renamed from librtld.so.
1998-06-02 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* libc.map: Remove _IO_getline_info which was erroneously
introduced in section GLIBC_2.0.
Noticed by Horst von Brand <vonbrand@sleipnir.valparaiso.cl>.
1998-06-01 Gordon Matzigkeit <gord@profitpress.com>
* sysdeps/generic/socket.c (__socket): Renamed from socket, and
created a weak alias.
* sysdeps/mach/hurd/socket.c (__socket): Likewise.
1998-05-31 Gordon Matzigkeit <gord@profitpress.com>
* sysdeps/mach/hurd/ftruncate.c (__ftruncate): Rename from old
ftruncate function, and create a weak alias to ftruncate.
1998-06-01 Gordon Matzigkeit <gord@profitpress.com>
* grp/fgetgrent_r.c: Use &errno instead of __errno_location ().
* inet/getnetgrent_r.c: Likewise.
* nss/getXXbyYY_r.c: Likewise.
* nss/getXXent_r.c: Likewise.
* pwd/fgetpwent_r.c: Likewise.
* shadow/sgetspent_r.c: Likewise.
* shadow/fgetspent_r.c: Likewise.
* sunrpc/publickey.c: Likewise.
1998-06-01 Gordon Matzigkeit <gord@profitpress.com>
* hurd/libhurduser.map: New file.
* mach/libmachuser.map: Likewise.
* libc.map: Add Hurd-specific functions to version 2.1.
Add __flshfp and __fillbf.
1998-05-30 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* manual/signal.texi (Basic Signal Handling): Fix typo.
* manual/errno.texi (Error Codes): Likewise.
1998-06-02 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/netipx/ipx.h: Include <bits/sockaddr.h>
instead of <sys/socket.h>.
Patch by NIIBE Yutaka <gniibe@mri.co.jp>
* sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c (DL_FIND_ARG_COMPONENTS):
Finally make it working.
Patch by Mark Hatle <fray@kernel.crashing.org>.
1998-03-22 Paul Eggert <eggert@twinsun.com>
* posix/regex.c: Include <wchar.h> before <wctype.h>, to work around
a Solaris 2.6 bug.
1997-04-02 16:55 Ulrich Drepper <drepper@cygnus.com>
* manual/socket.texi: Document behaviour of inet_ntoa in multi-
threaded programs.
* manual/stdio.texi: Change wording for snprintf description a bit.
Correct typo in example.
* manual/lang.texi: Add documentation of __va_copy.
* Makefile: Add rule to easily generate dir-add.texi file.
* manual/Makefile: Likewise.
* manual/arith.texi: Add description of lldiv_t, lldiv, and atoll.
Change description of strtoll and strtoull to make clear these
are the preferred names.
Describe `inf', `inifinity', `nan', `nan(...)' inputs for strtod
and friends.
Change references to HUGE_VALf and HUGE_VALl to HUGE_VALF and
HUGE_VALL.
* sysdeps/libm-ieee754/s_nan.c: Use strtod if parameter is not empty
* sysdeps/libm-ieee754/s_nanl.c: Likewise.