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As discussed in bug 28327, C23 changed the fromfp functions to return floating types instead of intmax_t / uintmax_t. (Although the motivation in N2548 was reducing the use of intmax_t in library interfaces, the new version does have the advantage of being able to specify arbitrary integer widths for e.g. assigning the result to a _BitInt, as well as being able to indicate an error case in-band with a NaN return.) As with other such changes from interfaces introduced in TS 18661, implement the new types as a replacement for the old ones, with the old functions remaining as compat symbols but not supported as an API. The test generator used for many of the tests is updated to handle both versions of the functions. Tested for x86_64 and x86, and with build-many-glibcs.py. Also tested tgmath tests for x86_64 with GCC 7 to make sure that the modified case for older compilers in <tgmath.h> does work. Also tested for powerpc64le to cover the ldbl-128ibm implementation and the other things that are handled differently for that configuration. The new tests fail for ibm128, but all the failures relate to incorrect signs of zero results and turn out to arise from bugs in the underlying roundl, ceill, truncl and floorl implementations that I've reported in bug 33623, rather than indicating any bug in the actual new implementation of the functions for that format. So given fixes for those functions (which shouldn't be hard, and of course should add to the tests for those functions rather than relying only on indirect testing via fromfp), the fromfp tests should start passing for ibm128 as well.
This directory contains the sources of the GNU C Library. See the file "version.h" for what release version you have. The GNU C Library is the standard system C library for all GNU systems, and is an important part of what makes up a GNU system. It provides the system API for all programs written in C and C-compatible languages such as C++ and Objective C; the runtime facilities of other programming languages use the C library to access the underlying operating system. In GNU/Linux systems, the C library works with the Linux kernel to implement the operating system behavior seen by user applications. In GNU/Hurd systems, it works with a microkernel and Hurd servers. The GNU C Library implements much of the POSIX.1 functionality in the GNU/Hurd system, using configurations i[4567]86-*-gnu and x86_64-gnu. When working with Linux kernels, this version of the GNU C Library requires Linux kernel version 3.2 or later. Also note that the shared version of the libgcc_s library must be installed for the pthread library to work correctly. The GNU C Library supports these configurations for using Linux kernels: aarch64*-*-linux-gnu alpha*-*-linux-gnu arc*-*-linux-gnu arm-*-linux-gnueabi csky-*-linux-gnuabiv2 hppa-*-linux-gnu i[4567]86-*-linux-gnu x86_64-*-linux-gnu Can build either x86_64 or x32 loongarch64-*-linux-gnu Hardware floating point, LE only. m68k-*-linux-gnu microblaze*-*-linux-gnu mips-*-linux-gnu mips64-*-linux-gnu or1k-*-linux-gnu powerpc-*-linux-gnu Hardware or software floating point, BE only. powerpc64*-*-linux-gnu Big-endian and little-endian. s390-*-linux-gnu s390x-*-linux-gnu riscv32-*-linux-gnu riscv64-*-linux-gnu sh[34]-*-linux-gnu sparc*-*-linux-gnu sparc64*-*-linux-gnu If you are interested in doing a port, please contact the glibc maintainers; see https://www.gnu.org/software/libc/ for more information. See the file INSTALL to find out how to configure, build, and install the GNU C Library. You might also consider reading the WWW pages for the C library at https://www.gnu.org/software/libc/. The GNU C Library is (almost) completely documented by the Texinfo manual found in the `manual/' subdirectory. The manual is still being updated and contains some known errors and omissions; we regret that we do not have the resources to work on the manual as much as we would like. For corrections to the manual, please file a bug in the `manual' component, following the bug-reporting instructions below. Please be sure to check the manual in the current development sources to see if your problem has already been corrected. Please see https://www.gnu.org/software/libc/bugs.html for bug reporting information. We are now using the Bugzilla system to track all bug reports. This web page gives detailed information on how to report bugs properly. The GNU C Library is free software. See the file COPYING.LIB for copying conditions, and LICENSES for notices about a few contributions that require these additional notices to be distributed. License copyright years may be listed using range notation, e.g., 1996-2015, indicating that every year in the range, inclusive, is a copyrightable year that would otherwise be listed individually.