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    SubjectRe: [ERROR] perf build failure on current tip:perf/core

    * Namhyung Kim <namhyung@gmail.com> wrote:

    > >> $ map pwrite
    > >> The program 'map' is currently not installed. You can install it by
    > >> typing:
    > >> sudo apt-get install sgt-puzzles
    > >>
    > >> I don't think this is the package what you said. Anyway quick grep'ing
    > >> pwrite tells me it's in the unistd.h:
    > >>
    > >> $ grep pwrite /usr/include/unistd.h
    > >> extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n,
    > >> extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf,
    > >> pwrite64) __wur;
    > >> # define pwrite pwrite64
    > >
    > > There's multiple definitions there, and we get lost somehow - as
    > > unistd.h is included:
    > >
    > > ~/tip/tools/perf> grep -n unistd.h util/trace-event-info.c
    > > 34:#include <unistd.h>
    > >
    > > Thanks,
    > >
    > > Ingo
    >
    > This is the content of my /usr/include/unistd.h:
    >
    > #ifdef __USE_UNIX98
    > # ifndef __USE_FILE_OFFSET64
    > extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
    > __off_t __offset) __wur;
    > extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n,
    > __off_t __offset) __wur;
    > # else
    > # ifdef __REDIRECT
    > extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
    > __off64_t __offset),
    > pread64) __wur;
    > extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf,
    > size_t __nbytes, __off64_t __offset),
    > pwrite64) __wur;
    > # else
    > # define pread pread64
    > # define pwrite pwrite64
    > # endif
    > # endif
    >
    > # ifdef __USE_LARGEFILE64
    > extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
    > __off64_t __offset) __wur;
    > extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n,
    > __off64_t __offset) __wur;
    > # endif
    > #endif
    >
    > I think all of pread/write functions are properly defined here:
    >
    > $ echo '#include <unistd.h>' | \
    > > gcc -xc -E -dM -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 - | \
    > > grep -e UNIX98 -e LARGEFILE64 -e FILE_OFFSET
    > #define __ILP32_OFFBIG_CFLAGS "-m32 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
    > #define _LARGEFILE64_SOURCE 1
    > #define __USE_UNIX98 1
    > #define __USE_LARGEFILE64 1
    > #define _FILE_OFFSET_BITS 64
    > #define __USE_FILE_OFFSET64 1

    So which preprocessor branch within unistd.h does it get into on
    your system and why isnt there a pwrite()/pwrite64() prototype
    once it goes along that path?

    You could try an ugly approach and edit your unistd.h and put in
    debug lines like this:

    #warn got here: __LINE__

    and thus see which branch it really gets into.

    (save a backup copy of unistd.h first ;-)

    Thanks,

    Ingo


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