[Bug driver/39439] The Driver hides "undefined reference" messages from shared libs (but not object files) in linker phase

["pinskia at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from pinskia at gmail dot com  2009-03-12 04:42 -------
Subject: Re:   New: The Driver hides "undefined reference" messages from shared
libs (but not object files) in linker phase



Sent from my iPhone

On Mar 11, 2009, at 9:27 PM, "rob1weld at aol dot com"
<gcc-bugzilla@gcc.gnu.org 
 > wrote:

> The Driver hides "undefined reference" messages from shared libs but
> not from object files. This seems inconsistent and is not helpful.
>

Why do you think the driver is doing instead of the linker?

> When compiling 'ppl' using the Trunk I'm getting a terse message
> about "undefined reference to `typeinfo for int'". This is not
> particularly useful since the words are common (can't grep for
> them) and there is no line number info explaining the location of
> the code that causes this issue.
>
> This page may suggest a reason this error occurs:
> http://stackoverflow.com/questions/307352/g-undefined-reference-to-typeinfo
>
>
> I'm calling this an RFE since I desire an increase in verbosity
> but there are no doubt arguments favoring this being a Bug.
>
>
> # gcc -v
> Using built-in specs.
> Target: i386-pc-solaris2.11
> Configured with: ../gcc_trunk/configure --prefix=/usr/local/gcc4
> --enable-languages=ada,c,c++,fortran,java,objc,obj-c++ --enable-shared
> --disable-static --enable-multilib --enable-decimal-float
> --with-long-double-128 --with-included-gettext --disable-stage1- 
> checking
> --enable-checking=release --with-tune=k8 --with-cpu=k8 --with-arch=k8
> --with-gnu-as --with-as=/usr/local/bin/as --with-gnu-ld
> --with-ld=/usr/local/bin/ld --with-gmp=/usr/local --with-mpfr=/usr/ 
> local
> --without-ppl
> Thread model: posix
> gcc version 4.4.0 20090309 (experimental) [trunk revision 144720]  
> (GCC)
>
>
> # gmake
> ...
> gmake[4]: Entering directory `/usr/share/src/ppl-build/demos/ 
> ppl_lpsol'
> gcc -DHAVE_CONFIG_H -I. -I../../../ppl/demos/ppl_lpsol -I../..
> -I../../interfaces/C  -I/usr/local/include -pedantic -std=gnu89 - 
> Werror -g -O3
> -fomit-frame-pointer -march=k8 -frounding-math  -W -Wall -MT  
> ppl_lpsol.o -MD
> -MP -MF .deps/ppl_lpsol.Tpo -c -o ppl_lpsol.o
> ../../../ppl/demos/ppl_lpsol/ppl_lpsol.c
> mv -f .deps/ppl_lpsol.Tpo .deps/ppl_lpsol.Po
> /bin/sh ../../libtool --tag=CXX   --mode=link g++  -g -O3 -fomit- 
> frame-pointer
> -march=k8 -frounding-math  -W -Wall   -o ppl_lpsol ppl_lpsol.o  
> dummy.o -lglpk
> ../../interfaces/C/libppl_c.la -lm -L/usr/local/lib -lgmpxx -L/usr/ 
> local/lib
> -lgmp -R/usr/local/lib -R/usr/local/lib
> libtool: link: g++ -g -O3 -fomit-frame-pointer -march=k8 -frounding- 
> math -W
> -Wall -o .libs/ppl_lpsol ppl_lpsol.o dummy.o  /usr/local/lib/ 
> libglpk.so -lz
> ../../interfaces/C/.libs/libppl_c.so -L/usr/local/lib
> /usr/share/src/ppl-build/src/.libs/libppl.so /usr/local/lib/libstdc+ 
> +.so
> /usr/local/lib/libgmpxx.so /usr/local/gcc4/lib/libstdc++.so -lm
> /usr/local/lib/libgmp.so -Wl,-rpath -Wl,/usr/local/lib -Wl,-rpath
> -Wl,/usr/local/gcc4/lib
> ../../interfaces/C/.libs/libppl_c.so: undefined reference to  
> `typeinfo for int'
> collect2: ld returned 1 exit status
> gmake[4]: *** [ppl_lpsol] Error 1
> gmake[4]: Leaving directory `/usr/share/src/ppl-build/demos/ppl_lpsol'
>
>
> If I run that using "-v" I get this collect command:
>
> /usr/local/gcc4/libexec/gcc/i386-pc-solaris2.11/4.4.0/collect2 -V -m  
> elf_i386
> -Y P,/usr/ccs/lib:/usr/lib -Qy -o .libs/ppl_lpsol /usr/lib/crt1.o
> /usr/lib/crti.o /usr/lib/values-Xa.o
> /usr/local/gcc4/lib/gcc/i386-pc-solaris2.11/4.4.0/crtbegin.o -L/usr/ 
> local/lib
> -L/usr/local/gcc4/lib/gcc/i386-pc-solaris2.11/4.4.0
> -L/usr/local/gcc4/lib/gcc/i386-pc-solaris2.11/4.4.0/../../..  
> ppl_lpsol.o
> dummy.o --verbose /usr/local/lib/libglpk.so -lz
> ../../interfaces/C/.libs/libppl_c.so
> /usr/share/src/ppl-build/src/.libs/libppl.so /usr/local/lib/libstdc+ 
> +.so
> /usr/local/lib/libgmpxx.so /usr/local/gcc4/lib/libstdc++.so
> /usr/local/lib/libgmp.so -rpath /usr/local/lib -rpath /usr/local/ 
> gcc4/lib
> -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
> /usr/local/gcc4/lib/gcc/i386-pc-solaris2.11/4.4.0/crtend.o /usr/lib/ 
> crtn.o
>
>
> If I run that then I get this simple and useless output:
>
> ../../interfaces/C/.libs/libppl_c.so: undefined reference to  
> `typeinfo for int'
> collect2: ld returned 1 exit status
>
>
> If I run that exact same command but make a simple alteration:
> - ... -lz ../../interfaces/C/.libs/libppl_c.so
> + ... -lz ../../interfaces/C/.libs/*.o
>
> I can use the Object files that were used to create the Shared Library
> instead of using the Shared Library. This is useful (due to this
> Bug or needed RFE) since the error messages printed are by _far_ more
> useful, see:
>
> # /usr/local/gcc4/libexec/gcc/i386-pc-solaris2.11/4.4.0/collect2 -V - 
> m elf_i386
> -Y P,/usr/ccs/lib:/usr/lib -Qy -o .libs/ppl_lpsol /usr/lib/crt1.o
> /usr/lib/crti.o /usr/lib/values-Xa.o
> /usr/local/gcc4/lib/gcc/i386-pc-solaris2.11/4.4.0/crtbegin.o -L/usr/ 
> local/lib
> -L/usr/local/gcc4/lib/gcc/i386-pc-solaris2.11/4.4.0
> -L/usr/local/gcc4/lib/gcc/i386-pc-solaris2.11/4.4.0/../../..  
> ppl_lpsol.o
> dummy.o /usr/local/lib/libglpk.so -lz   ../../interfaces/C/.libs/*.o
> /usr/share/src/ppl-build/src/.libs/libppl.so /usr/local/lib/libstdc+ 
> +.so
> /usr/local/lib/libgmpxx.so /usr/local/gcc4/lib/libstdc++.so
> /usr/local/lib/libgmp.so -rpath /usr/local/lib -rpath /usr/local/ 
> gcc4/lib
> -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
> /usr/local/gcc4/lib/gcc/i386-pc-solaris2.11/4.4.0/crtend.o /usr/lib/ 
> crtn.o
> GNU ld (GNU Binutils) 2.19.1
>  Supported emulations:
>   elf_i386_ldso
>   elf_i386
>   elf_x86_64
> ../../interfaces/C/.libs/ppl_c__BD_Shape_mpq_class.o: In function
> `sgn<Parma_Polyhedra_Library::Checked_Number<__gmp_expr<__mpz_struct  
> [1],
> __mpz_struct [1]>, Parma_Polyhedra_Library::Extended_Number_Policy>  
> >':
> /usr/share/src/ppl-build/interfaces/C/../../src/ppl.hh:11187:  
> undefined
> reference to `typeinfo for int'
> ../../interfaces/C/.libs/ppl_c__BD_Shape_mpq_class.o: In function
> `sgn<Parma_Polyhedra_Library::Checked_Number<__gmp_expr<__mpq_struct  
> [1],
> __mpq_struct [1]>,  
> Parma_Polyhedra_Library::WRD_Extended_Number_Policy> >':
> /usr/share/src/ppl-build/interfaces/C/../../src/ppl.hh:11187:  
> undefined
> reference to `typeinfo for int'
> ../../interfaces/C/.libs/ppl_c__BD_Shape_mpq_class.o: In function
> `sgn<Parma_Polyhedra_Library::Checked_Number<__gmp_expr<__mpz_struct  
> [1],
> __mpz_struct [1]>,  
> Parma_Polyhedra_Library::WRD_Extended_Number_Policy> >':
> /usr/share/src/ppl-build/interfaces/C/../../src/ppl.hh:11187:  
> undefined
> reference to `typeinfo for int'
> ../../interfaces/C/.libs/ppl_c__BD_Shape_mpq_class.o: In function
> `sgn<Parma_Polyhedra_Library::Checked_Number<__gmp_expr<__mpq_struct  
> [1],
> __mpq_struct [1]>, Parma_Polyhedra_Library::Extended_Number_Policy>  
> >':
> /usr/share/src/ppl-build/interfaces/C/../../src/ppl.hh:11187:  
> undefined
> reference to `typeinfo for int'
> /usr/share/src/ppl-build/interfaces/C/../../src/ppl.hh:11187:  
> undefined
> reference to `typeinfo for int'
> ../../interfaces/C/.libs/ppl_c__BD_Shape_mpq_class.o:/usr/share/src/ 
> ppl-build/interfaces/C/../../src/ppl.hh:11187:
> more undefined references to `typeinfo for int' follow
> collect2: ld returned 1 exit status
>
> See how gcc now gives line numbers that show exactly were the  
> undefined
> references may be located instead of just complaining that there are  
> some,
> somewhere.
>
> Rob
>
>
> -- 
>           Summary: The Driver hides "undefined reference" messages  
> from
>                    shared libs (but not object files) in linker phase
>           Product: gcc
>           Version: 4.4.0
>            Status: UNCONFIRMED
>          Severity: enhancement
>          Priority: P3
>         Component: driver
>        AssignedTo: unassigned at gcc dot gnu dot org
>        ReportedBy: rob1weld at aol dot com
> GCC build triplet: *
>  GCC host triplet: *
> GCC target triplet: *
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39439
>


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39439