A build problem of C++ code on Cygwin

[Angelo Graziosi <Angelo dot Graziosi at roma1 dot infn dot it>]

I want to flag the following problem occurred on Cygwin BUT NOT on Linux.
                                                        =======

I have tried to build LiDIA (A C++ Library For Computational Number
Theory, http://www.informatik.tu-darmstadt.de/TI/LiDIA/) library on
Cygwin.

After the 

   ./configure

the

    make

failed:

-----------------------------------------------------------
cd library  && make  all
make[1]: Entering directory `/tmp/lidia-2.2.0/.build/library'
Making all in base
make[2]: Entering directory `/tmp/lidia-2.2.0/.build/library/base'
if g++ -DHAVE_CONFIG_H   -I../../include -I../../src/base/include
-I../../../lib
rary/base/../../src/base/include   -O2 -MT bytes_to_int_flag_generator.o
-MD -MP
 -MF ".deps/bytes_to_int_flag_generator.Tpo" -c -o
bytes_to_int_flag_generator.o
 `test -f '../../src/portability/bytes_to_int_flag_generator.cc' || echo
'../../
../library/base/'`../../src/portability/bytes_to_int_flag_generator.cc; \ 
then mv -f
".deps/bytes_to_int_flag_generator.Tpo" ".deps/bytes_to_int_f
lag_generator.Po"; else rm -f
".deps/bytes_to_int_flag_generator.Tpo"; exit 1; f
i

gcc   bytes_to_int_flag_generator.o   -o bytes_to_int_flag_generator

bytes_to_int_flag_generator.o:bytes_to_int_flag_generator.cc:(.text+0x17): undef
ined reference to `std::basic_ostream<char, std::char_traits<char> >&
std::operator<< <std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char>
>&, char const*)'

[....]

collect2: ld returned 1 exit status
make[2]: *** [bytes_to_int_flag_generator] Error 1
make[2]: Leaving directory `/tmp/lidia-2.2.0/.build/library/base'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/tmp/lidia-2.2.0/.build/library'
make: *** [all-subdirs] Error 2
-----------------------------------------------------------

It tries to build C++ with gcc:

  gcc   bytes_to_int_flag_generator.o   -o bytes_to_int_flag_generator

The trick to solve this has been (before the 'make'):


   cd library/base
   g++ ../../../src/portability/bytes_to_int_flag_generator.cc \
       -c -o bytes_to_int_flag_generator.o
   g++ bytes_to_int_flag_generator.o -o bytes_to_int_flag_generator
   cd ../..

then
  
   make

In this way the build was completed succefully.


On Linux (with gcc 4.0.3) all worked fine:

   ./configure
   make

----------------------------------------------------------------
cd library  && make  all
make[1]: Entering directory `/home/angelo/tmp/lidia-2.2.0/.build/library'
Making all in base
make[2]: Entering directory
`/home/angelo/tmp/lidia-2.2.0/.build/library/base'
if g++ -DHAVE_CONFIG_H   -I../../include -I../../src/base/include
-I../../../lib
rary/base/../../src/base/include   -O2 -MT bytes_to_int_flag_generator.o
-MD -MP
 -MF ".deps/bytes_to_int_flag_generator.Tpo" -c -o
bytes_to_int_flag_generator.o
 `test -f '../../src/portability/bytes_to_int_flag_generator.cc' || echo
'../../
../library/base/'`../../src/portability/bytes_to_int_flag_generator.cc; \
        then mv -f
".deps/bytes_to_int_flag_generator.Tpo" ".deps/bytes_to_int_f
lag_generator.Po"; else rm -f
".deps/bytes_to_int_flag_generator.Tpo"; exit 1; f
i
/bin/sh ../../libtool --tag=CXX --mode=link g++  -O2   -o
bytes_to_int_flag_gene
rator  bytes_to_int_flag_generator.o
mkdir .libs
g++ -O2 -o bytes_to_int_flag_generator bytes_to_int_flag_generator.o
./bytes_to_int_flag_generator > ../../include/bytes_to_int_flag.h
make  all-am
...
----------------------------------------------------------------


So the question is : what could be the cause of this different behaviour ?


I have all Cygwin installed and updated. 

I use GCC 3.4.4-2 (but also 3.4.4-1 gives the same results).


Cheers,

   Angelo.


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