mirror of git://sourceware.org/git/glibc.git
8df5d34720
There is a configure option --without-fp that specifies that nofpu sysdeps directories should be used instead of fpu directories. For most glibc configurations, this option is of no use: either there is no valid nofpu variant of that configuration, or there are no fpu or nofpu sysdeps directories for that processor and so the option does nothing. For a few configurations, if you are using a soft-float compiler this option is required, and failing to use it generally results in compilation errors from inline asm using unavailable floating-point instructions. We're moving away from --with-cpu to configuring glibc based on how the compiler generates code, and it is natural to do so for --without-fp as well; in most cases the soft-float and hard-float ABIs are incompatible so you have no hope of building a working glibc with an inappropriately configured compiler or libgcc. This patch eliminates --without-fp, replacing it entirely by automatic configuration based on the compiler. Configurations for which this is relevant (coldfire / mips / powerpc32 / sh) define a variable with_fp_cond in their preconfigure fragments (under the same conditions under which those fragments do anything); this is a preprocessor conditional which the toplevel configure script then uses in a test to determine which sysdeps directories to use. The config.make with-fp variable remains. It's used only by powerpc (sysdeps/powerpc/powerpc32/Makefile) to add -mhard-float to various flags variables. For powerpc, -mcpu= options can imply use of soft-float. That could be an issue if you want to build for e.g. 476fp, but are using --with-cpu=476 because there isn't a 476fp sysdeps directory. If in future we eliminate --with-cpu and replace it entirely by testing the compiler, it would be natural at that point to eliminate that code as well (as the user should then just use a compiler defaulting to 476fp and the 476 sysdeps directory would be used automatically). Tested for x86_64, and tested with build-many-glibcs.py that installed shared libraries are unchanged by this patch. * configure.ac (--with-fp): Remove configure option. (with_fp_cond): New variable. (libc_cv_with_fp): New configure test. Use this variable instead of with_fp. * configure: Regenerated. * config.make.in (with-fp): Use @libc_cv_with_fp@. * manual/install.texi (Configuring and compiling): Remove --without-fp. * INSTALL: Regenerated. * sysdeps/m68k/preconfigure (with_fp_cond): Define for ColdFire. * sysdeps/mips/preconfigure (with_fp_cond): Define. * sysdeps/powerpc/preconfigure (with_fp_cond): Define for 32-bit. * sysdeps/sh/preconfigure (with_fp_cond): Define. * scripts/build-many-glibcs.py (Context.add_all_configs): Do not use --without-fp to configure glibc. |
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|---|---|---|
| .. | ||
| bits | ||
| fpu | ||
| ieee754 | ||
| include/sys | ||
| mips32 | ||
| mips64 | ||
| nptl | ||
| sys | ||
| Implies | ||
| Makefile | ||
| __longjmp.c | ||
| abort-instr.h | ||
| add_n.S | ||
| addmul_1.S | ||
| atomic-machine.h | ||
| backtrace.c | ||
| bsd-_setjmp.S | ||
| bsd-setjmp.S | ||
| configure | ||
| configure.ac | ||
| dl-dtprocnum.h | ||
| dl-machine-reject-phdr.h | ||
| dl-machine.h | ||
| dl-procinfo.c | ||
| dl-procinfo.h | ||
| dl-tls.h | ||
| dl-trampoline.c | ||
| fpregdef.h | ||
| fpu_control.h | ||
| gccframe.h | ||
| jmpbuf-unwind.h | ||
| ldsodefs.h | ||
| libc-tls.c | ||
| linkmap.h | ||
| localplt.data | ||
| lshift.S | ||
| machine-gmon.h | ||
| math-tests.h | ||
| math_private.h | ||
| memcpy.S | ||
| memset.S | ||
| memusage.h | ||
| mul_1.S | ||
| nan-high-order-bit.h | ||
| preconfigure | ||
| regdef.h | ||
| rshift.S | ||
| setjmp.S | ||
| setjmp_aux.c | ||
| sgidefs.h | ||
| sotruss-lib.c | ||
| stackinfo.h | ||
| start.S | ||
| strcmp.S | ||
| sub_n.S | ||
| submul_1.S | ||
| tininess.h | ||
| tls-macros.h | ||
| tst-abi-fp32mod.c | ||
| tst-abi-fp64amod.c | ||
| tst-abi-fp64mod.c | ||
| tst-abi-fpxxmod.c | ||
| tst-abi-fpxxomod.c | ||
| tst-abi-interlink.c | ||
| tst-audit.h | ||
| tst-mode-switch-1.c | ||
| tst-mode-switch-2.c | ||
| tst-mode-switch-3.c | ||