Messages in this thread | | | Date | Sun, 8 Jan 2012 15:03:19 +0100 | From | Ingo Molnar <> | Subject | Re: [ERROR] perf build failure on current tip:perf/core |
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* 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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