Messages in this thread | | | From | Namhyung Kim <> | Subject | Re: [ERROR] perf build failure on current tip:perf/core | Date | Sun, 08 Jan 2012 21:30:58 +0900 |
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Ingo Molnar <mingo@elte.hu> wrote:
> * Namhyung Kim <namhyung@gmail.com> wrote: > >> 2012-01-08 (일), 10:00 +0100, Ingo Molnar: >> > * Namhyung Kim <namhyung@gmail.com> wrote: >> > >> > > Hi, >> > > >> > > When I tried to build perf, I was faced with following error: >> > > >> > > CC util/trace-event-info.o >> > > cc1: warnings being treated as errors >> > > util/trace-event-info.c: In function ‘record_file’: >> > > util/trace-event-info.c:192: error: implicit declaration of function >> > > ‘pwrite’ >> > > util/trace-event-info.c:192: error: nested extern declaration of >> > > ‘pwrite’ >> > > make: *** [util/trace-event-info.o] Error 1 >> > > >> > > The code I tried was latest tip:perf/core - 9e183426bfb5 ("perf kvm: Fix >> > > copy & paste error in description") and code in mainline (v3.2) doesn't >> > > have this problem. Looking at the code, I couldn't find any clue to >> > > this. Any idea? >> > > >> > > FYI, my system is Ubuntu 10.04 on x86_64. gcc version is 4.4.3: >> > >> > Which header does pwrite() belong to on that system - what does >> > 'map pwrite' say? It ought to be unistd.h, which is directly >> > included in util/trace-event-info.c. >> > >> > My guess is that it might be related to: >> > >> > tools/perf/Makefile:ALL_CFLAGS = $(CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 >> > >> > Which introduces pwrite64() and defines pwrite() to them. >> > >> > Does the patch below help? It's only a workaround really as >> > pwrite() ought to exist ... Also, i have only tested this on >> > 64-bit. >> > >> > Thanks, >> > >> > Ingo >> > >> > diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c >> > index ac6830d..ba8b024 100644 >> > --- a/tools/perf/util/trace-event-info.c >> > +++ b/tools/perf/util/trace-event-info.c >> > @@ -189,7 +189,7 @@ static void record_file(const char *file, size_t hdr_sz) >> > if (bigendian()) >> > sizep += sizeof(u64) - hdr_sz; >> > >> > - if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) >> > + if (hdr_sz && pwrite64(output_fd, sizep, hdr_sz, hdr_pos) < 0) >> > die("writing to %s", output_file); >> > } >> > >> >> Hello, >> >> Unfortunately, above patch doesn't work for my system: >> >> CC util/trace-event-info.o >> cc1: warnings being treated as errors >> util/trace-event-info.c: In function ‘record_file’: >> util/trace-event-info.c:192: error: implicit declaration of function >> ‘pwrite64’ >> util/trace-event-info.c:192: error: nested extern declaration of >> ‘pwrite64’ >> >> And 'map pwrite' on terminal says: > > 'man pwrite' i wanted to say.
Ah, OK :) here it is.
PREAD(2) Linux Programmer's Manual PREAD(2)
NAME pread, pwrite - read from or write to a file descriptor at a given offset
SYNOPSIS #define _XOPEN_SOURCE 500
#include <unistd.h>
ssize_t pread(int fd, void *buf, size_t count, off_t offset);
ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset); ...
And #defining _XOPEN_SOURCE to 500 before the #include doesn't resolve the issue.
> >> $ 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
Thanks, Namhyung
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