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Re: undefined reference to C++ constructs in libppl when linking cc1-dummy.exe


Hi,

On Tue, Aug 31, 2010 at 4:39 PM, Doug Crawford <dcraw101@yahoo.com> wrote:
> I am using crossstool-ng 1.8.1 built and hosted on cygwin and targeting powerpc
> linux uclibc.? It successfully builds libbackend.a then tries to link
> cc1-dummy.exe but that step generates a lot of errors related to undefined
> references to exception handlers and other C++ standard library stuff in
> libppl_c.a.
Sounds like a known, recurrent, issue. See
http://sourceware.org/ml/crossgcc/2010-07/msg00055.html and
follow-ups. The patch will not work. The problem is that
$(final_LDFLAGS) ends up before -lppl, whereas it should be placed
after to resolve undefined symbol brought in by -lppl.

> If libppl_c.a contains c++ constructs shouldn't the link too be
> i686_build_pc_cygwin_g++?
No -g++ should not be used for the link, gcc is written (so far) in C
and is only using the C interface to Cloog/PPL. The link fails only
because we're using static companion libraries. You can enable shared
companion libraries, with the C wrapper, it "may" work.

 - Arnaud

> I have included the relevant error from
> the log.? The complete log is here: http://pastebin.com/Ugsy55a5
> ? ? ? ?1. i686-build_pc-cygwin-gcc ?-pipe -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE ?-W
> -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual
> -Wold-style-definition -Wc++-compat -Wmissing-format-attribute -pedantic
> -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings ? -DHAVE_CONFIG_H
> -lstdc++ -lm -Wl,--stack,8388608 -o cc1-dummy.exe c-lang.o stub-objc.o attribs.o
> c-errors.o c-lex.o c-pragma.o c-decl.o c-typeck.o c-convert.o c-aux-info.o
> c-common.o c-opts.o c-format.o c-semantics.o c-ppoutput.o c-cppbuiltin.o
> c-objc-common.o c-dump.o c-pch.o c-parser.o rs6000-c.o c-gimplify.o
> tree-mudflap.o c-pretty-print.o c-omp.o dummy-checksum.o ? ? ? ? ? main.o
> ?libbackend.a ../libcpp/libcpp.a ../libdecnumber/libdecnumber.a
> ../libcpp/libcpp.a ?-liconv ../libiberty/libiberty.a
> ../libdecnumber/libdecnumber.a
> -L/opt/x-tools/targets/powerpc-860-linux-uclibc/build/static/lib -lcloog
> -L/opt/x-tools/targets/powerpc-860-linux-uclibc/build/static/lib -lppl_c -lppl
> -lgmpxx ?-L/opt/x-tools/targets/powerpc-860-linux-uclibc/build/static/lib
> -L/opt/x-tools/targets/powerpc-860-linux-uclibc/build/static/lib -lmpfr -lgmp
> ? ? ? ?2. [ALL ?]
> ?/opt/x-tools/targets/powerpc-860-linux-uclibc/build/static/lib/libppl_c.a(ppl_c_BD_Shape_mpz_class.o):ppl_c_BD_Shape_mpz_class.cc:(.text+0xf6):
> ?undefined reference to `___cxa_begin_catch'
> ? ? ? ?3. [ALL ?]
> ?/opt/x-tools/targets/powerpc-860-linux-uclibc/build/static/lib/libppl_c.a(ppl_c_BD_Shape_mpz_class.o):ppl_c_BD_Shape_mpz_class.cc:(.text+0x10f):
> ?undefined reference to `___cxa_end_catch'
>
>
>
>
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>

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