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2023-09-25newlib: Add missing prototype for _getentropyTorbjörn SVENSSON1-0/+1
2023-09-11Reentrancy, attempt to always provide _Thread_local in <sys/reent.h>Pekka Seppänen1-0/+1
Attempt to always provide _Thread_local in <sys/reent.h> by including <sys/cdefs.h>. The C specific keyword _Thread_local is not available unless targetting a suitable C version.
2023-09-11Reentrancy, conditionally provide default __getreent() implementationPekka Seppänen1-0/+4
Conditionally provide default __getreent() implementation only if _REENT_THREAD_LOCAL is not defined. If struct _reent is replaced by dedicated thread-local objects neither the structure nor _impure_ptr is available.
2023-09-11Reentrancy, use _REENT_ERRNO()Pekka Seppänen4-14/+14
Use _REENT_ERRNO() macro to access errno. This encapsulation is required, as errno might be either _errno member of struct _reent, _tls_errno or any such implementation detail.
2023-08-29libc/stdlib/nano-mallocr.c, typo in variable namePekka Seppänen1-1/+1
Nano malloc uses `size' in assertation whereas the correct variable would be `s'. Given this has existed ever since nano malloc support was added, based on the context ("returned payload area of desired size does not exceed the actual allocated chunk") I presume that indeed `s' (user input) and not `r->size' (computed) shall be used.
2023-08-17newlib: add Xtensa portAlexey Lapshin25-1/+2334
2023-08-15struct _reent: add state for unicode functionsCorinna Vinschen1-0/+16
C23 requires that the unicode functions c16rtomb, c8rtomb, mbrtoc16, mbrtoc32 and mbrtoc8 use their own internal state object. c32rtomb only needs an internal state if the lib supports encoding with shift states, but that's the case for newlib and Cygwin. Only Cygwin implements these functions so add the states objects only for Cygwin for now. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-08-09sys/unistd.h: define GNU extensions SEEK_DATA and SEEK_HOLECorinna Vinschen1-0/+4
SEEK_DATA and SEEK_HOLE are GNU nonstandard extensions also present in Solaris, FreeBSD, and DragonFly BSD; they are proposed for inclusion in the next POSIX revision (Issue 8). Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-08-09Add stub for getentropyTorbjörn SVENSSON6-0/+71
Example test case that fails with undefined reference to getentropy: Testing g++.robertl/eb77.C, -std=c++20 doing compile Executing on host: /build/gcc-13-2709-g9ac9fde961f/bin/arm-none-eabi-g++ /build/src/gcc/gcc/testsuite/g++.old-deja/g++.robertl/eb77.C -mthumb -march=armv6s-m -mcpu=cortex-m0 -mfloat-abi=soft -fdiagnostics-plain-output -fmessage-length=0 -std=c++20 -pedantic-errors -Wno-long-long -Wl,--start-group -lc -lm -Wl,--end-group --specs=nosys.specs -Wl,--allow-multiple-definition -Wl,-u,_isatty,-u,_fstat -Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort -Wl,g++_tg.o -lm -o ./eb77.exe (timeout = 800) spawn -ignore SIGHUP /build/gcc-13-2709-g9ac9fde961f/bin/arm-none-eabi-g++ /build/src/gcc/gcc/testsuite/g++.old-deja/g++.robertl/eb77.C -mthumb -march=armv6s-m -mcpu=cortex-m0 -mfloat-abi=soft -fdiagnostics-plain-output -fmessage-length=0 -std=c++20 -pedantic-errors -Wno-long-long -Wl,--start-group -lc -lm -Wl,--end-group --specs=nosys.specs -Wl,--allow-multiple-definition -Wl,-u,_isatty,-u,_fstat -Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort -Wl,g++_tg.o -lm -o ./eb77.exe pid is 28414 -28414 /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): in function `std::(anonymous namespace)::__libc_getentropy(void*)': (.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined reference to `getentropy' /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): in function `std::random_device::_M_init(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': (.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): undefined reference to `getentropy' /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libc.a(libc_a-arc4random.o): in function `_rs_stir': (.text._rs_stir+0x8): undefined reference to `getentropy' collect2: error: ld returned 1 exit status pid is -1 close result is 28414 exp6 0 1 output is /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): in function `std::(anonymous namespace)::__libc_getentropy(void*)': (.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined reference to `getentropy' /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): in function `std::random_device::_M_init(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': (.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): undefined reference to `getentropy' /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libc.a(libc_a-arc4random.o): in function `_rs_stir': (.text._rs_stir+0x8): undefined reference to `getentropy' collect2: error: ld returned 1 exit status status 1 compiler exited with status 1 FAIL: g++.old-deja/g++.robertl/eb77.C -std=c++20 (test for excess errors) Excess errors: (.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined reference to `getentropy' (.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): undefined reference to `getentropy' (.text._rs_stir+0x8): undefined reference to `getentropy' UNRESOLVED: g++.old-deja/g++.robertl/eb77.C -std=c++20 compilation failed to produce executable Contributed by STMicroelectronics Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
2023-08-07sys/cdefs.h: introduce __restrict_arr, as in glibcCorinna Vinschen1-0/+13
C99 allows to define arrays as non-overlappiung using the restrict keyword. This is supported by GCC 3.1 and later, but it's not allowed in C++. This is in preparation of fixing a Cygwin build problem introduce by commit 3c75fac130b5. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-08-07sys/cdefs.h: fix for use __restrict in C++Sebastian Huber1-9/+7
Newlib shares large parts of <sys/cdefs.h> with FreeBSD and received this bug report: https://sourceware.org/pipermail/newlib/2023/020400.html As an extension, GCC and clang offer C99-style restricted pointers in C++ mode: https://gcc.gnu.org/onlinedocs/gcc/Restricted-Pointers.html We notice that this extension is broken when including newlib headers: restricted pointers are treated as ordinary pointers. We traced this to the following section of newlib/libc/include/sys/cdefs.h: /* * GCC 2.95 provides `__restrict' as an extension to C90 to support the * C99-specific `restrict' type qualifier. We happen to use `__restrict' as * a way to define the `restrict' type qualifier without disturbing older * software that is unaware of C99 keywords. */ #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95) #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 #define __restrict #else #define __restrict restrict #endif #endif While the GCC __restrict extension was indeed introduced in GCC 2.95, it is not limited to this version; the extension is also not limited to C90: https://gcc.gnu.org/gcc-2.95/c++features.html Rewrite the logic in the header so that __restrict is kept alone when available. PR: 272723 MFC after: 1 week
2023-08-07<sys/cdefs.h>: Decay expression passed to fallbackJohn Baldwin1-1/+4
version of __generic() This ensures that __generic() more closely matches _Generic() when using the fallback version when _Generic() is not available (such as GCC). Co-authored by: jrtc27 Reviewed by: jrtc27 Differential Revision: https://reviews.freebsd.org/D38215
2023-08-04newlib: gdtoa: Suppress compiler warning.Takashi Yano1-1/+1
Fixes: 5ac83ea47a7a ("newlib: Fix memory leak regarding gdtoa-based _ldtoa_r().") Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
2023-08-02sys/features.h: Define _ISOC2X_SOURCE and __ISO_C_VISIBLECorinna Vinschen1-1/+14
Add feature test for C2X code. Add matching definitions _ISOC2X_SOURCE for requesting sources and __ISO_C_VISIBLE to be used in headers. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-08-02newlib: Fix memory leak regarding gdtoa-based _ldtoa_r().Takashi Yano2-13/+14
After the commit a4705d387f78, printf() for floating-point values causes a memory leak. The legacy _ldtoa_r() assumed the char pointer returned will be free'ed by Bfree(). However, gdtoa-based _ldtoa_r() returns the pointer returned by gdtoa() which should be free'ed by freedtoa(). Due to this issue, the caller of _ldtoa_r() fails to free the allocated char buffer. This is the cause of the said memory leak. https://cygwin.com/pipermail/cygwin/2023-July/254054.html This patch makes rv_alloc()/freedtoa() allocate/free the buffer in a compatible way with legacy _ldtoa_r(). Fixes: a4705d387f78 ("ldtoa: Import gdtoa from OpenBSD.") Reported-by: natan_b <natan_b@libero.it> Reviewed-by: Corinna Vinschen <corinna@vinschen.de> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
2023-07-31Revert "* libc/stdlib/mbtowc_r.c (__ascii_mbtowc): Disallow conversion of"Corinna Vinschen2-12/+0
This reverts commit 2b77087a48ea56e77fca5aeab478c922f6473d7c. For some reason lost in time, commit 2b77087a48ea5 introduced Cygwin-specific code treating single byte characters outside the portable character set as illegal chars. However, Cygwin was always alone with this over-correct behaviour and it leads to stuff like gnulib replacing functions defined in Cygwin with their own implementation just due to that. Revert this change, sans the changes to ChangeLog. Fixes: 2b77087a48ea ("* libc/stdlib/mbtowc_r.c (__ascii_mbtowc): Disallow conversion of") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-07-26Rename _NL_CTYPE_OUTDIGITSx_MB/WC to _NL_CTYPE_OUTDIGITx_MB/WCCorinna Vinschen1-20/+20
The extended _NL_foo names were originally designed after their GLibc counterparts. However, the OUTDIGIT macros were accidentally defined as OUTDIGITS, plural. Fix them. Fixes: d47d5b850bed ("Extend locale support to maintain wide char values of native strings") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-07-26RISC-V: Support Zfinx/Zdinx extension.Kito Cheng via Newlib3-8/+8
Zfinx/Zdinx are new extensions ratified in 2022, it similar to F/D extensions, support hard float operation for single/double precision, but the difference between Zfinx/Zdinx and F/D is Zfinx/Zdinx is operating under general purpose registers rather than dedicated floating-point registers. This patch improve the hard float support detection for RISC-V port, so that Zfinx/Zdinx can have better/right performance. Co-authored-by: Jesse Huang <jesse.huang@sifive.com>
2023-07-26Define _AT_NULL_PATHNAME_ALLOWEDCorinna Vinschen1-5/+6
Cygwin needs an internal flag to allow specifying an empty pathname in utimesat (GLIBC extension). We define it in _default_fcntl.h to make sure we never introduce a value collision accidentally. While at it, define the values as 16 bit hex values. Reviewed-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-07-18Fix typo.Jeff Johnston1-1/+1
2023-07-17Change getlogin() to only check stdin being nullJordi Sanfeliu1-2/+0
2023-07-13newlib: posix: add HAVE_OPENDIR build condition for [n]ftw.cAlexey Lapshin2-0/+6
2023-06-21Make SIG2STR_MAX usable in #ifMingye Wang1-2/+2
The text accepted for POSIX issue 8 requires that SIG2STR_MAX be usable in #if, which we currently break with sizeof. Use static values instead.
2023-05-30m68k: disallow unaligned access for m68010 and m68020Remy Bohmer1-1/+1
Disable at least m68010 and m68020. These processors certainly do not like unaligned accesses. Signed-off-by: Remy Bohmer <linux@bohmer.net> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> Signed-off-by: Austin Morton <austinpmorton@gmail.com> Signed-off-by: Chris Packham <judge.packham@gmail.com>
2023-05-17fix __time_load_locale return codeAlexey Lapshin1-1/+3
- add explicit __HAVE_LOCALE_INFO__ check
2023-05-16newlib: Add non LDBL_EQ_DBL math support for aarch64, i386, and x86_64Jennifer Averett3-8/+18
Rename s_nearbyint.c, s_fdim.c and s_scalbln.c to remove conflicts Remove functions that are not needed from above files Modify include paths Add includes missing in cygwin build Add missing types Create Makefiles Create header files to resolve dependencies between directories Modify some instances of unsigned long to uint64_t for 32 bit platforms Add HAVE_FPMATH_H
2023-05-16newlib: Add FreeBSD files for non LDBL_EQ_DBL supportJennifer Averett4-0/+378
FreeBSD files to add long double support for i386, aarch64 and x86_64.
2023-05-05Move signgm.c from libc/reent to libm/mathJennifer Averett2-17/+0
2023-04-26Fix _REENT_EMERGENCY() if TLS is enabledSebastian Huber2-2/+2
If the thread-local storage (TLS) support was enabled, the _REENT_EMERGENCY() object had the wrong size. It must be a buffer of length _REENT_EMERGENCY_SIZE and not just a single character.
2023-04-24RTEMS: Add __m68k_read_tp() to crt0.cSebastian Huber1-0/+4
This is required to build libgomp.
2023-04-19posix_spawn_file_actions_addfchdir_np: return EBADF on negative fdCorinna Vinschen1-1/+6
FreeBSD and Musl implement posix_spawn_file_actions_addfchdir_np so that it checks the incoming descriptor for being negative, and, if so, return with EBADF. The POSIX proposal defining posix_spawn_file_actions_addfchdir follows this behaviour, see https://www.austingroupbugs.net/view.php?id=1208 Fixes: 7e03fc35f528 ("Add posix_spawn_file_actions_add{f}chdir_np") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-04-18Add posix_spawn_file_actions_add{f}chdir_npCorinna Vinschen2-2/+94
These are defined as _np functions and available in glibc, musl, macOS, FreeBSD, Solaris ≥ 11.3 They are likely to be standardized without the _np suffix as a result of Austin Group issue 1208. if so, both names will be kept as aliases. Introduce HAVE_CHDIR and HAVE_FCHDIR to allow building on systems not providing these calls. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-03-30Bump newlib version in the manual to 4.3.0Tobias Burnus1-2/+2
While commit 9e09d6ed8 (tag: newlib-4.3.0) bumped the newlib version to 4.3.0, this commit updates the version/date in the libc/libm manuals to match.
2023-03-24newlocale: set errno to ENOENT if __loadlocale failsCorinna Vinschen1-1/+4
__loadlocale never sets errno, but newlocale is supposed to return ENOENT if the locale isn't valid. Fixes: aefd8b5b518b ("Implement newlocale, freelocale, duplocale, uselocale") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-03-16Cygwin: add support for GB18030 codesetCorinna Vinschen2-4/+13
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-03-03arm: Restrict processor mode change when in hypervisor modeSrinath Parvathaneni1-7/+7
If a CPU implements EL2 as its highest exception level then programs using newlib may start in hypervisor mode. In that state it is not trivial to switch into the various EL1 modes to configure the individual exception stacks, so do not try.
2023-03-03arm: Fix the SP used in setting stack limit for standalone application.Srinath Parvathaneni1-2/+1
Move the instruction that saves SP before the mode check so that applications that start in USER mode correctly set the stack limit.
2023-02-27nano-mallocr: Prevent NULL pointer de-reference in free_listHenrik Nilsson via Newlib1-5/+14
The existing code checked if there was a chunk in free_list and that the tail was not the next chunk. The check if there is a chunk is not needed since it's already known but the case of a single chunk in free_list needs to be handled differently.
2023-02-25ctype_cp.h/ctype_iso.h: clean whitespaceCorinna Vinschen2-43/+43
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-02-25Cygwin: fully support KOI8-T codesetCorinna Vinschen3-6/+50
Commit 89eb4bce152f was pretty half-hearted, missing the codepage character type tables and wctomb/mbtowc mappings. Fixes: 89eb4bce152f ("Cygwin: support KOI8-T codeset") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-02-24Cygwin: convert Windows locale handling from LCID to ISO5646 stringsCorinna Vinschen1-1/+1
Since Windows Vista, locale handling is converted from using numeric locale identifiers (LCID) to using ISO5646 locale strings. In the meantime Windows introduced new locales which don't even have a LCID attached. Those were unusable in Cygwin because locale information for these locales required to call the new locale functions taking a locale string. Convert Cygwin to drop LCIDs and use Windows ISO5646 locales instead. The last place using LCIDs is the __set_charset_from_locale function. Checking numerically is easier and uslay faster than checking strings. However, this function is clearly a TODO
2023-02-24Cygwin: support KOI8-T codesetCorinna Vinschen3-25/+52
Used on Linux as default codeset for Tajik. There's no matching Windows codepage, so fake it as CP103. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-02-22RISC-V: Use the new libm code if possibleHau Hsu1-0/+5
Set __OBSOLETE_MATH_DEFAULT to 0 if 'd' extension is supported (i.e. __riscv_flen == 64). Base on the comment for __OBSOLETE_MATH_DEFAULT: > ... it assumes that the toolchain has ISO C99 support (hexfloat > literals, standard fenv semantics), the target has IEEE-754 conforming > binary32 float and binary64 double (not mixed endian) representation, > standard SNaN representation, double and single precision arithmetics > has similar latency and it has no legacy SVID matherr support, only > POSIX errno and fenv exception based error handling. Signed-off-by: Hau Hsu <hau.hsu@sifive.com>
2023-02-20newlib/libc/{ctype, string}/*.t: Unicode 15 character width and property tablesBrian Inglis3-58/+91
2023-02-20newlib/libc/ctype/mkcaseconv: fix POSIX shell invalid == comparisonBrian Inglis1-1/+1
2023-02-06setlocale: create LC_ALL string when changing localeCorinna Vinschen1-4/+10
This patch is for the sake of gnulib. gnulib implements some form of a thread-safe setlocale variant called setlocale_null_r, which is supposed to return the locale strings in a thread-safe manner. This only succeeds if the system's setlocale already handles this thread-safe, otherwise gnulib adds some locking on its own. Newlib's setlocale always writes the global string array holding the LC_ALL value anew on each invocation of setlocale(LC_ALL, NULL). Since that doesn't allow to call setlocale(LC_ALL, NULL) in a thread-safe manner, so locking in gnulib is required. And here's the problem... The lock is decorated as dllexport when building for Cygwin. This collides with the default behaviour of ld to export all symbols. If it finds one decorated symbol, it will only export this symbol to the DLL import lib. Change setlocale so that it writes the global string array holding the LC_ALL value at the time the locale gets changed. On setlocale(LC_ALL, NULL), just return the pointer to the global LC_ALL string array, just as in GLibc. The burden of doing so is negligibly for all targets, but adds thread-safety for gnulib's setlocal_null_r() function, and gnulib can drop the lock entirely when building for Cygwin. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2023-02-03libc: arm: Implement setjmp GCC backwards compatibility.Victor L. Do Nascimento1-0/+22
When compiling Newlib for arm targets with GCC 12.1 onward, the passing of architecture extension information to the assembler is automatic, making the use of .fpu and .arch_extension directives in assembly files redundant. With older versions of GCC, however, these directives must be hard-coded into the `arm/setjmp.S' file to allow the assembly of instructions concerning the storage and subsequent reloading of the floating point registers to/from the jump buffer, respectively. This patch conditionally adds the `.fpu vfpxd' and `.arch_extension mve' directives based on compile-time preprocessor macros concerning GCC version and target architectural features, such that both the assembly and linking of setjmp.S succeeds for older versions of Newlib.
2023-01-27RISC-V: Fix floating-point environment support for soft floatMaciej W. Rozycki1-0/+9
We don't have floating-point exception or non-default rounding mode support for the RISC-V soft-float environment, `feraiseexcept' and `fesetround' do nothing unless the `__riscv_flen' macro has been set. Therefore following ISO C language requirements[1] only define macros for soft float that correspond to actually supported floating-point environment features, removing failures from GCC testing such as: FAIL: gcc.dg/torture/fp-int-convert-timode-3.c -O0 execution test FAIL: gcc.dg/torture/fp-int-convert-timode-4.c -O0 execution test References: [1] "Programming languages -- C", ISO/IEC 9899:2023, working draft -- September 3, 2022, Section 7.6 "Floating-point environment <fenv.h>" Fixes: 7040b2de0883 ("Add RISC-V port for libm") Signed-off-by: Maciej W. Rozycki <macro@embecosm.com>
2023-01-19nvptx: In offloading execution, map '_exit' to 'abort' [GCC PR85463]Thomas Schwinge1-3/+12
This is still not properly resolving <https://gcc.gnu.org/PR85463> '[nvptx] "exit" in offloaded region doesn't terminate process', but is one step into that direction, and allows for simplifying some GCC code.
2023-01-19nvptx: Provide stub 'getpid', 'kill', 'stat'Thomas Schwinge1-0/+17
... as implemented for GCN in 'newlib/libc/sys/amdgcn/*' files, but (for now) still adding to the catch-all 'newlib/libc/machine/nvptx/misc.c' file. This is necessary for the GCC/Fortran I/O system, for example. Co-authored-by: Andrew Stubbs <ams@codesourcery.com>
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