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glibc's Makeconfig defines some variables such as $(libm) and $(libdl) for linking with libraries built by glibc, and nptl/Makeconfig (included by the toplevel Makeconfig) defines others such as $(shared-thread-library). In some places glibc's Makefiles use those variables when linking against the relevant libraries, but in other places they hardcode the location of the libraries in the build tree. This patch cleans up various places to use the variables that already exist (in the case of libm, replacing several duplicate definitions of a $(link-libm) variable in subdirectory Makefiles). (It's not necessarily exactly equivalent to what the existing code does - in particular, $(shared-thread-library) includes libpthread_nonshared, but is replacing places that just referred to libpthread.so. But I think that change is desirable on the general principle of linking things as close as possible to the way in which they would be linked with an installed library, unless there is a clear reason not to do so.) To support running tests with an installed copy of glibc without needing the full build tree from when that copy was built, I think it will be useful to use such variables more generally and systematically - every time the rules for building a test refer to some file from the build tree that's also installed by glibc, use a makefile variable so that the installed-testing case can point those variables to installed copies of the files. This patch just deals with straightforward cases where such variables already exist. It's quite possible some uses of $(shared-thread-library) should actually be a new $(thread-library) variable that's set appropriately in the --disable-shared case, if those uses would in fact work without shared libraries. I didn't change the status quo that those cases hardcode use of a shared library whether or not it's actually needed (but other uses such as $(libm) and $(libdl) would now get the static library if the shared library isn't built, when some previously hardcoded use of the shared library - if they actually need shared libraries, the test itself needs an enable-shared conditional anyway). Tested x86_64. * benchtests/Makefile ($(addprefix $(objpfx)bench-,$(bench-math))): Depend on $(libm), not $(common-objpfx)math/libm.so. ($(addprefix $(objpfx)bench-,$(bench-pthread))): Depend on $(shared-thread-library), not $(common-objpfx)nptl/libpthread.so. * elf/Makefile ($(objpfx)noload): Depend on $(libdl), not $(common-objpfx)dlfcn/libdl.so. ($(objpfx)tst-audit8): Depend on $(libm), not $(common-objpfx)math/libm.so. * malloc/Makefile ($(objpfx)libmemusage.so): Depend on $(libdl), not $(common-objpfx)dlfcn/libdl.so. * math/Makefile ($(addprefix $(objpfx),$(filter-out $(tests-static),$(tests)))): Depend on $(libm), not $(objpfx)libm.so. Do not condition on [$(build-shared) = yes]. ($(objpfx)test-fenv-tls): Depend on $(shared-thread-library), not $(common-objpfx)nptl/libpthread.so. * misc/Makefile ($(objpfx)tst-tsearch): Depend on $(libm), not $(common-objpfx)math/libm.so$(libm.so-version) or $(common-objpfx)math/libm.a depending on [$(build-shared) = yes]. * nptl/Makefile ($(objpfx)tst-unload): Depend on $(libdl), not $(common-objpfx)dlfcn/libdl.so. * setjmp/Makefile (link-libm): Remove variable. ($(objpfx)tst-setjmp-fp): Depend on $(libm), not $(link-libm). * stdio-common/Makefile (link-libm): Remove variable. ($(objpfx)tst-printf-round): Depend on $(libm), not $(link-libm). * stdlib/Makefile (link-libm): Remove variable. ($(objpfx)bug-getcontext): Depend on $(libm), not $(link-libm). ($(objpfx)tst-strtod-round): Likewise. ($(objpfx)tst-tininess): Likewise. ($(objpfx)tst-strtod-underflow): Likewise. ($(objpfx)tst-strtod6): Likewise. ($(objpfx)tst-tls-atexit): Depend on $(shared-thread-library) and $(libdl), not $(common-objpfx)nptl/libpthread.so and $(common-objpfx)dlfcn/libdl.so.
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 The code for other CPU configurations supported by volunteers outside of the core glibc maintenance effort is contained in the `ports' add-on, located in the `ports' subdirectory of the source tree. 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.