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Re: GCC 4.7.2: Mudflap linker errors

From: bd satish <bdsatish at gmail dot com>
To: vhaisman at gmail dot com, "Frank Ch. Eigler" <fche at redhat dot com>
Cc: gcc at gcc dot gnu dot org
Date: Sat, 22 Sep 2012 14:25:50 +0300
Subject: Re: GCC 4.7.2: Mudflap linker errors
References: <CAEA_72UTP6m=JhqS9JAzeqk=ZFAi0YnyStVYSvpDgOJDg6fFGA@mail.gmail.com> <y0mvcf6vo2e.fsf@fche.csb> <CAEA_72WRrDQdgbg0gm36N0GAH4i2BSFXfw5b4UFMMQXurKJYxw@mail.gmail.com>

Hi,

Thanks to Zeman, here is the output of (gcc -v -fmudflap file.cc -lmudflap):

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/user/foss/installed/gcc/libexec/gcc/x86_64-unknown-linux-gnu/4.7.2/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --prefix=/home/user/foss/installed/gcc
--enable-languages=c,c++ --disable-multilib --disable-multiarch
--enable-checking=runtime --enable-libmudflap --enable-libgomp
--disable-bootstrap --enable-static --disable-shared
--disable-decimal-float --with-system-zlib --disable-libitm
--disable-build-poststage1-with-cxx --disable-build-with-cxx
--without-cloog --without-ppl --disable-nls --enable-threads
--enable-__cxa_atexit --with-gmp=/home/user/foss/installed/gmp
--with-mpfr=/home/user/foss/installed/mpfr
--with-mpc=/home/user/foss/installed/mpc
Thread model: posix
gcc version 4.7.2 (GCC)
COLLECT_GCC_OPTIONS='-v' '-fmudflap' '-mtune=generic' '-march=x86-64'
 /home/user/foss/installed/gcc/libexec/gcc/x86_64-unknown-linux-gnu/4.7.2/cc1plus
-quiet -v -D_GNU_SOURCE references.cc -D_MUDFLAP -include mf-runtime.h
-quiet -dumpbase references.cc -mtune=generic -march=x86-64 -auxbase
references -version -fmudflap -fno-builtin -fno-merge-constants -o
/tmp/ccmawnfm.s
GNU C++ (GCC) version 4.7.2 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.4.5, GMP version 5.0.5, MPFR
version 2.4.2, MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../include/c++/4.7.2
 /home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../include/c++/4.7.2/x86_64-unknown-linux-gnu
 /home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../include/c++/4.7.2/backward
 /home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/include
 /usr/local/include
 /home/user/foss/installed/gcc/include
 /home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/include-fixed
 /usr/include
End of search list.
GNU C++ (GCC) version 4.7.2 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.4.5, GMP version 5.0.5, MPFR
version 2.4.2, MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 2a2682bf88529e20cb2f41b930a50deb
COLLECT_GCC_OPTIONS='-v' '-fmudflap' '-mtune=generic' '-march=x86-64'
 as -v --64 -o /tmp/ccThOFbp.o /tmp/ccmawnfm.s
GNU assembler version 2.20.1 (x86_64-linux-gnu) using BFD version (GNU
Binutils for Debian) 2.20.1-system.20100303
COMPILER_PATH=/home/user/foss/installed/gcc/libexec/gcc/x86_64-unknown-linux-gnu/4.7.2/:/home/user/foss/installed/gcc/libexec/gcc/x86_64-unknown-linux-gnu/4.7.2/:/home/user/foss/installed/gcc/libexec/gcc/x86_64-unknown-linux-gnu/:/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/:/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/
LIBRARY_PATH=/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/:/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-fmudflap' '-mtune=generic' '-march=x86-64'
 /home/user/foss/installed/gcc/libexec/gcc/x86_64-unknown-linux-gnu/4.7.2/collect2
--eh-frame-hdr -m elf_x86_64 -dynamic-linker
/lib64/ld-linux-x86-64.so.2 /usr/lib/../lib64/crt1.o
/usr/lib/../lib64/crti.o
/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/crtbegin.o
--wrap=main -L/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2
-L/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64
-L/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../..
/tmp/ccThOFbp.o -lmudflap -lstdc++ -lm -export-dynamic -lgcc -lc -lgcc
/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/crtend.o
/usr/lib/../lib64/crtn.o
/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib64/libmudflap.a(mf-runtime.o):
In function `__mfu_check':
/home/user/foss/gcc-4.7.2/build/x86_64-unknown-linux-gnu/libmudflap/../../../libmudflap/mf-runtime.c:912:
undefined reference to `__real_malloc'
/home/user/foss/gcc-4.7.2/build/x86_64-unknown-linux-gnu/libmudflap/../../../libmudflap/mf-runtime.c:1028:
undefined reference to `__real_free'
/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib64/libmudflap.a(mf-runtime.o):
In function `__mf_insert_new_object':
/home/user/foss/gcc-4.7.2/build/x86_64-unknown-linux-gnu/libmudflap/../../../libmudflap/mf-runtime.c:1074:
undefined reference to `__real_calloc'
/home/user/foss/installed/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib64/libmudflap.a(mf-runtime.o):
In function `__mfu_unregister':
/home/user/foss/gcc-4.7.2/build/x86_64-unknown-linux-gnu/libmudflap/../../../libmudflap/mf-runtime.c:1430:
undefined reference to `__real_free'
/home/user/foss/gcc-4.7.2/build/x86_64-unknown-linux-gnu/libmudflap/../../../libmudflap/mf-runtime.c:1433:
undefined reference to `__real_free'
/home/user/foss/gcc-4.7.2/build/x86_64-unknown-linux-gnu/libmudflap/../../../libmudflap/mf-runtime.c:1436:
undefined reference to `__real_free'


PS: Please keep me in CC, I'm not subscribed to the list.

Thanks & Regards,
Satish


On 22 September 2012 08:11, bd satish <bdsatish@gmail.com> wrote:
> Hi,
>
> Here is the output of (gcc -v):
> Using built-in specs.
> COLLECT_GCC=g++
> COLLECT_LTO_WRAPPER=/home/user/installed/gcc/libexec/gcc/x86_64-unknown-linux-gnu/4.7.2/lto-wrapper
> Target: x86_64-unknown-linux-gnu
> Configured with: ../configure --prefix=/home/user/installed/gcc
> --enable-languages=c,c++ --disable-multilib --disable-multiarch
> --enable-checking=runtime --enable-libmudflap --enable-libgomp
> --disable-bootstrap --enable-static --disable-shared
> --disable-decimal-float --with-system-zlib --disable-libitm
> --disable-build-poststage1-with-cxx --disable-build-with-cxx
> --without-cloog --without-ppl --disable-nls --enable-threads
> --enable-__cxa_atexit --with-gmp=/home/bdsatish/foss/installed/gmp
> --with-mpfr=/home/bdsatish/foss/installed/mpfr
> --with-mpc=/home/bdsatish/foss/installed/mpc
> Thread model: posix
> gcc version 4.7.2 (GCC)
>
> Thanks & Regards,
> Satish
>
> On 22 September 2012 04:33, Frank Ch. Eigler <fche@redhat.com> wrote:
>> bd satish <bdsatish@gmail.com> writes:
>>
>>> [...]
>>> The following piece of code, gives "undefined references" to
>>> __real_malloc, __real_free, etc.:
>>> Compiled with:
>>> g++ -fmudflap references.cc -lmudflap
>>>
>>> /lib64/libmudflap.a(mf-runtime.o): In function `__mfu_check':
>>> ../libmudflap/mf-runtime.c:912: undefined reference to `__real_malloc'
>>> [...]
>>
>> According to libmudflap/mf-impl.h, since you're using ordinary
>> archives rather than shared libraries (-fPIC) these __real_FOO
>> functions are expected to be provided by the linker:
>>
>>    (1) The static method involves a list of -wrap=foo flags being passed to
>>    the linker, which then links references to "foo" to the symbol
>>    "__wrap_foo", and links references to "__real_foo" to the symbol "foo".
>>    When compiled without -DPIC, libmudflap.a contains such __wrap_foo
>>    functions which delegate to __real_foo functions in libc to get their
>>    work done.
>>
>> So, something appears wrong with this wrapping mechanism in your case.
>> Can you rerun g++ with -v to see how the linker is invoked?  Perhaps
>> there is something missing for the C++ static-linking case.
>>
>>
>> - FChE

References:
- GCC 4.7.2: Mudflap linker errors
  - From: bd satish
- Re: GCC 4.7.2: Mudflap linker errors
  - From: Frank Ch. Eigler
- Re: GCC 4.7.2: Mudflap linker errors
  - From: bd satish

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