[Bug target/81193] PowerPC GCC __builtin_cpu_is and __builtin_cpu_supports should warn about old libraries

["meissner at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81193

--- Comment #13 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Wed Jul 12 23:07:50 2017
New Revision: 250165

URL: https://gcc.gnu.org/viewcvs?rev=250165&root=gcc&view=rev
Log:
[gcc]
2017-07-12  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/81193
        * config/rs6000/rs6000-c.c (rs6000_cpu_cpp_builtins): If GLIBC
        provides the hardware capability bits, define the macro
        __BUILTIN_CPU_SUPPORTS__.
        * config/rs6000/rs6000.c (cpu_expand_builtin): Generate a warning
        if GLIBC does not provide the hardware capability bits.  Add a
        gcc_unreachable call if the built-in cpu function is neither
        __builtin_cpu_is nor __builtin_cpu_supports.
        (rs6000_get_function_versions_dispatcher): Change the warning
        that an old GLIBC is used which does not export the capability
        bits to be an error.
        * doc/extend.texi (target_clones attribute): Document the
        restriction that GLIBC 2.23 or newer is needed on the PowerPC.
        (PowerPC built-in functions): Document that GLIBC 2.23 or newer is
        needed by __builtin_cpu_is and __builtin_cpu_supports.  Document
        the macros defined by GCC if the newer GLIBC is available.

[gcc/testsuite]
2017-07-12  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/81193
        * gcc.target/powerpc/bmi-andn-1.c: Add guard against using
        __builtin_cpu_supports with old GLIBC's.
        * gcc.target/powerpc/bmi-andn-2.c: Likewise.
        * gcc.target/powerpc/bmi-bextr-1.c: Likewise.
        * gcc.target/powerpc/bmi-bextr-2.c: Likewise.
        * gcc.target/powerpc/bmi-bextr-4.c: Likewise.
        * gcc.target/powerpc/bmi-bextr-5.c: Likewise.
        * gcc.target/powerpc/bmi-blsi-1.c: Likewise.
        * gcc.target/powerpc/bmi-blsi-2.c: Likewise.
        * gcc.target/powerpc/bmi-blsmsk-1.c: Likewise.
        * gcc.target/powerpc/bmi-blsmsk-2.c: Likewise.
        * gcc.target/powerpc/bmi-blsr-1.c: Likewise.
        * gcc.target/powerpc/bmi-blsr-2.c: Likewise.
        * gcc.target/powerpc/bmi-tzcnt-1.c: Likewise.
        * gcc.target/powerpc/bmi-tzcnt-2.c: Likewise.
        * gcc.target/powerpc/bmi2-bzhi32-1.c: Likewise.
        * gcc.target/powerpc/bmi2-bzhi64-1.c: Likewise.
        * gcc.target/powerpc/bmi2-mulx32-1.c: Likewise.
        * gcc.target/powerpc/bmi2-mulx32-2.c: Likewise.
        * gcc.target/powerpc/bmi2-mulx64-1.c: Likewise.
        * gcc.target/powerpc/bmi2-mulx64-2.c: Likewise.
        * gcc.target/powerpc/bmi2-pdep32-1.c: Likewise.
        * gcc.target/powerpc/bmi2-pdep64-1.c: Likewise.
        * gcc.target/powerpc/bmi2-pext32-1.c: Likewise.
        * gcc.target/powerpc/bmi2-pext64-1.c: Likewise.
        * gcc.target/powerpc/cpu-builtin-1.c: Likewise.

[libgcc]
2017-07-12  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/81193
        * configure.ac (PowerPC float128 hardware support): Test whether
        we can use __builtin_cpu_supports before enabling the ifunc
        handler.
        * configure: Regenerate.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/rs6000-c.c
    trunk/gcc/config/rs6000/rs6000.c
    trunk/gcc/doc/extend.texi
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-andn-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-andn-2.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-bextr-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-bextr-2.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-bextr-4.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-bextr-5.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-blsi-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-blsi-2.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-blsmsk-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-blsmsk-2.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-blsr-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-blsr-2.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-tzcnt-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi-tzcnt-2.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-bzhi32-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-bzhi64-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-mulx32-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-mulx32-2.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-mulx64-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-mulx64-2.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-pdep32-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-pdep64-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-pext32-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/bmi2-pext64-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/cpu-builtin-1.c
    trunk/libgcc/ChangeLog
    trunk/libgcc/configure
    trunk/libgcc/configure.ac