[Bug 667470] Re: Linking against libc built with profiling fails

[Balint Reczey]

The libc6-prof package (in the form this bug has been written against)
has been removed after the 14.04 release.

** Changed in: glibc (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/667470

Title:
  Linking against libc built with profiling fails

Status in glibc package in Ubuntu:
  Fix Released

Bug description:
  I'm trying to build my program with the libc profiling (from package
  libc6-prof) enabled, and it doesn't work at all.

  $ lsb_release -rd
  Description:    Ubuntu 10.10
  Release:        10.10

  The README says I should add "-static-libgcc -lc_p" to my link line,
  but if I do that I get:

  gcc  -g -pg   -o foobar  ar.o arscan.o commands.o default.o dir.o expand.o file.o function.o getopt.o getopt1.o implicit.o job.o main.o misc.o read.o remake.o remote-stub.o rule.o signame.o strcache.o variable.o version.o vpath.o hash.o   -lrt -static-libgcc -lc_p
  read.o: In function `tilde_expand':
  read.c:2968: warning: Using 'getpwnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
  /usr/bin/ld: dynamic STT_GNU_IFUNC symbol `strcmp' with pointer equality in `/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/libc_p.a(strcmp.op)' can not be used when making an executable; recompile with -fPIE and relink with -pie
  collect2: ld returned 1 exit status

  If I take out the -static-libgcc (but leave in -lc_p of course) I get
  the same error.

  If I try linking my application statically, by adding -static to the
  link line, then I get just the warning:

  read.c:2968: warning: Using 'getpwnam' in statically linked
  applications requires at runtime the shared libraries from the glibc
  version used for linking

  and the link succeeds, but if I try to run the executable it simply
  coredumps:

  $ ./foobar
  Segmentation fault

  GDB says:

  (gdb) run
  Starting program: foobar

  Program received signal SIGSEGV, Segmentation fault.
  0x000000000049be0b in __mcount_internal ()

  Of course if I build without profiling it works fine.

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