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Various glibc functions call __stpcpy and __mempcpy for namespace reasons instead of plain stpcpy and mempcpy. But __stpcpy and __mempcpy are macros that call __builtin_stpcpy and __builtin_mempcpy, and unless GCC optimizes the calls, they end up calling the C functions stpcpy and mempcpy. For calls from within shared libc, libc_hidden_builtin_proto ensures that calls to those C functions are in turn mapped to call __GI_stpcpy and __GI_mempcpy. However, for static libc, and for calls from shared libraries other than libc, the ELF symbols stpcpy and mempcpy end up getting called, breaking the ISO C namespace (in the case of stpcpy) or glibc conventions about not relying on the "future library directions" reservations (in the case of mempcpy). This patch fixes this by adding declarations of these functions to include/string.h, under an appropriate condition, with __asm__ used to change the assembler name used for calls (the mempcpy case was previously discussed, and the approach for the fix is as I suggested in <https://sourceware.org/ml/libc-alpha/2013-02/msg00063.html>). Tested for x86_64 with the testsuite; also checked that dcigettext.o (an example previously noted of undesired calls to stpcpy and mempcpy) now calls __stpcpy and __mempcpy instead, as do non-libc shared libraries (__stpcpy and __mempcpy were already exported from shared libc). Disassembly of installed shared libraries isn't easy to compare because of reordered PLT entries resulting from the change in functions called (libnsl, libnss_compat, libnss_dns, libnss_files, libnss_hesiod, libnss_nis, libnss_nisplus, libpthread, librt all have such changes). [BZ #17573] * include/string.h [NOT_IN_libc || !SHARED] (mempcpy): Declare with asm name __mempcpy. [NOT_IN_libc || !SHARED] (stpcpy): Declare with asm name __stpcpy. |
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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. The current GNU/Hurd support requires out-of-tree patches that will eventually be incorporated into an official GNU C Library release. When working with Linux kernels, this version of the GNU C Library requires Linux kernel version 2.6.32 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 arm-*-linux-gnueabi hppa-*-linux-gnu Not currently functional without patches. i[4567]86-*-linux-gnu x86_64-*-linux-gnu Can build either x86_64 or x32 ia64-*-linux-gnu m68k-*-linux-gnu microblaze*-*-linux-gnu mips-*-linux-gnu mips64-*-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 sh[34]-*-linux-gnu sparc*-*-linux-gnu sparc64*-*-linux-gnu tilegx-*-linux-gnu tilepro-*-linux-gnu If you are interested in doing a port, please contact the glibc maintainers; see http://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 http://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 http://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., 2000-2013, indicating that every year in the range, inclusive, is a copyrightable year that would otherwise be listed individually.