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wanglongqi / pdf2djvu

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Fails to build with clang++ -stdlib=libc++: use of overloaded operator '<<' is ambiguous #88

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
I had pdf2djvu installed by means of MacPorts systems on MacOSX MountainLion, 
but after upgrading to OSX 10.9 Mavericks, trying to update the pdf2djvu port 
fails as described here:

https://trac.macports.org/ticket/41298

The same failure occurs if I do the following:

$ wgets https://pdf2djvu.googlecode.com/files/pdf2djvu_0.7.17.tar.gz

$ tar -xvf pdf2djvu_0.7.17.tar.gz

$ cd pdf2djvu-0.7.17/

$ ./configure CC=clang CXX=clang++
checking whether the C++ compiler works... yes
checking for C++ compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C++ compiler... yes
checking whether clang++ accepts -g... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking how to run the C++ preprocessor... clang++ -E
checking for pkg-config... /opt/local/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for DJVULIBRE... yes
checking DjVuLibre fitness... ok
checking for POPPLER... yes
checking for GRAPHICSMAGICK... yes
checking for XSLT... yes
checking for fork... yes
checking for PStreams... no (or not usable)
checking whether make sets $(MAKE)... yes
checking for a thread-safe mkdir -p... tools/install-sh -c -d
checking whether NLS is requested... yes
checking for msgfmt... /opt/local/bin/msgfmt
checking for gmsgfmt... /opt/local/bin/msgfmt
checking for xgettext... /opt/local/bin/xgettext
checking for msgmerge... /opt/local/bin/msgmerge
checking for gcc... clang
checking whether we are using the GNU C compiler... yes
checking whether clang accepts -g... yes
checking for clang option to accept ISO C89... none needed
checking build system type... x86_64-apple-darwin13.0.0
checking host system type... x86_64-apple-darwin13.0.0
checking for ld used by GCC... 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/u
sr/bin/ld
checking if the linker 
(/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/
usr/bin/ld) is GNU ld... no
checking for shared library run path origin... done
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for CFPreferencesCopyAppValue... yes
checking for CFLocaleCopyCurrent... yes
checking for GNU gettext in libc... no
checking for iconv... yes
checking for working iconv... yes
checking how to link with libiconv... -liconv
checking for GNU gettext in libintl... no
checking whether to use NLS... no
checking for wchar_t encoding... UTF-32 or UTF-16
checking for OpenMP flag of C++ compiler... unknown
checking for MinGW ANSI stdio... no
checking CXXFLAGS for maximum warnings... -Wall
configure: creating ./config.status
config.status: creating Makefile.common
config.status: creating version.hh
config.status: executing po-directories commands

WARNING: Parallel page rendering will be disabled.
Please consider using a compiler with OpenMP support to enable this
functionality.

$ make
clang++ -g -O2 -Wall -Werror=overloaded-virtual -I/opt/local/include  
-I/opt/local/include/poppler  -I/opt/local/include/GraphicsMagick  
-I/opt/local/include -I/opt/local/include/libxml2    -c -o config.o config.cc
clang++ -g -O2 -Wall -Werror=overloaded-virtual -I/opt/local/include  
-I/opt/local/include/poppler  -I/opt/local/include/GraphicsMagick  
-I/opt/local/include -I/opt/local/include/libxml2    -c -o debug.o debug.cc
tools/generate-paths-hh localedir /usr/local/share/locale djvulibre_bindir 
/opt/local/bin
clang++ -g -O2 -Wall -Werror=overloaded-virtual -I/opt/local/include  
-I/opt/local/include/poppler  -I/opt/local/include/GraphicsMagick  
-I/opt/local/include -I/opt/local/include/libxml2    -c -o i18n.o i18n.cc
clang++ -g -O2 -Wall -Werror=overloaded-virtual -I/opt/local/include  
-I/opt/local/include/poppler  -I/opt/local/include/GraphicsMagick  
-I/opt/local/include -I/opt/local/include/libxml2    -c -o image-filter.o 
image-filter.cc
clang++ -g -O2 -Wall -Werror=overloaded-virtual -I/opt/local/include  
-I/opt/local/include/poppler  -I/opt/local/include/GraphicsMagick  
-I/opt/local/include -I/opt/local/include/libxml2    -c -o pdf-backend.o 
pdf-backend.cc
In file included from pdf-backend.cc:29:
/opt/local/include/poppler/UTF8.h:59:12: warning: unused function 'mapUCS2'
      [-Wunused-function]
static int mapUCS2(Unicode u, char *buf, int bufSize) {
           ^
1 warning generated.
clang++ -g -O2 -Wall -Werror=overloaded-virtual -I/opt/local/include  
-I/opt/local/include/poppler  -I/opt/local/include/GraphicsMagick  
-I/opt/local/include -I/opt/local/include/libxml2    -c -o pdf-dpi.o pdf-dpi.cc
clang++ -g -O2 -Wall -Werror=overloaded-virtual -I/opt/local/include  
-I/opt/local/include/poppler  -I/opt/local/include/GraphicsMagick  
-I/opt/local/include -I/opt/local/include/libxml2    -c -o pdf2djvu.o 
pdf2djvu.cc
pdf2djvu.cc:215:11: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'File')
  command << *component.file;
  ~~~~~~~ ^  ~~~~~~~~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:983:29: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'File')
    djvused << "-s" << "-f" << outlines_sed_file << this->index_file;
    ~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:994:31: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'File')
      djvused << "-s" << "-f" << metadata_sed_file << this->index_file;
      ~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1028:33: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'TemporaryFile')
        djvused << "-s" << "-f" << dummy_sed_file << this->index_file;
        ~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1036:31: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'File')
      djvused << "-s" << "-f" << metadata_sed_file << this->index_file;
      ~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1092:5: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'TemporaryFile')
    << *this->index_file
    ^  ~~~~~~~~~~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1125:17: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'TemporaryFile')
    bzz << "-e" << bzz_file << "-";
    ~~~~~~~~~~~ ^  ~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1373:11: warning: unknown pragma ignored [-Wunknown-pragmas]
  #pragma omp parallel for private(out1, outm, outs, doc) firstprivate(d...
          ^
pdf2djvu.cc:1383:15: warning: unknown pragma ignored [-Wunknown-pragmas]
      #pragma omp critical
              ^
pdf2djvu.cc:1405:13: warning: unknown pragma ignored [-Wunknown-pragmas]
    #pragma omp critical
            ^
pdf2djvu.cc:1501:16: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'DjVuCommand' and 'TemporaryFile')
      csepdjvu << sep_file << component;
      ~~~~~~~~ ^  ~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1531:51: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'TemporaryFile')
        cjb2 << "-losslevel" << config.loss_level << pbm_file << sjbz_file;
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1546:35: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'TemporaryFile')
          c44 << "-slice" << "97" << ppm_file << c44_file;
          ~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1563:23: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'DjVuCommand' and 'TemporaryFile')
          djvuextract << c44_file << std::string("BG44=") + std::string(...
          ~~~~~~~~~~~ ^  ~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
pdf2djvu.cc:1604:44: error: use of overloaded operator '<<' is ambiguous (with
      operand types 'Command' and 'TemporaryFile')
      djvused << component << "-s" << "-f" << sed_file;
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~
./system.hh:83:12: note: candidate function
  Command &operator <<(const std::string& arg);
           ^
./system.hh:84:12: note: candidate function
  Command &operator <<(int i);
           ^
3 warnings and 12 errors generated.
make: *** [pdf2djvu.o] Error 1

Ciao,
 Angelo.

Original issue reported on code.google.com by graziosi...@gmail.com on 22 Nov 2013 at 8:51

GoogleCodeExporter commented 9 years ago 
Thanks for the bug report.

Very odd. I suspect it's a bug (or maybe a misfeature) in your compiler or in 
your C++ standard library.

It looks like File objects can be implicitly converted to int; but there's no 
such conversion operator declared in the File class itself, so it must have 
been derived from std::fstream.

Can you tell me if test_fstream_to_int.cc can be compiled with your clang++? 
Here (Linux, clang 3.2) it fails as expected:

$ clang++ test_fstream_to_int.cc
test_fstream_to_int.cc:6:4: error: invalid operands to binary expression 
('std::fstream' (aka 'basic_fstream<char>') and 'int')
        f + 42;
        ~ ^ ~~

But anyway, the attached patch should hopefully fix the problem.

Original comment by jwilk@jwilk.net on 23 Nov 2013 at 5:27

Attachments:

GoogleCodeExporter commented 9 years ago 
Thanks for the quick replay... :-)

Your test case on OSX 10.9 Mavericks builds with a warning:

$ clang++ test_fstream_to_int.cc
test_fstream_to_int.cc:6:4: warning: expression result unused [-Wunused-value]
        f + 42;
        ~ ^ ~~
1 warning generated.

being,

$ clang++ -v
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin13.0.0
Thread model: posix

Instead, trying on the same system, with g++ 4.8.2 (installed with as MacPorts 
port), it fails:

$ g++ test_fstream_to_int.cc
test_fstream_to_int.cc: In function 'int main(int, char**)':
test_fstream_to_int.cc:6:4: error: no match for 'operator+' (operand types are 
'std::fstream {aka std::basic_fstream<char>}' and 'int')
  f + 42;
    ^
test_fstream_to_int.cc:6:4: note: candidates are:
In file included from /opt/local/include/gcc48/c++/string:52:0,
                 from /opt/local/include/gcc48/c++/bits/locale_classes.h:40,
                 from /opt/local/include/gcc48/c++/bits/ios_base.h:41,
                 from /opt/local/include/gcc48/c++/ios:42,
                 from /opt/local/include/gcc48/c++/istream:38,
                 from /opt/local/include/gcc48/c++/fstream:38,
                 from test_fstream_to_int.cc:1:
/opt/local/include/gcc48/c++/bits/basic_string.h:2418:5: note: template<class 
_CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> 
std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, _CharT)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
     ^
/opt/local/include/gcc48/c++/bits/basic_string.h:2418:5: note:   template 
argument deduction/substitution failed:
test_fstream_to_int.cc:6:6: note:   'std::fstream {aka 
std::basic_fstream<char>}' is not derived from 'const std::basic_string<_CharT, 
_Traits, _Alloc>'
  f + 42;
      ^
In file included from /opt/local/include/gcc48/c++/string:52:0,
                 from /opt/local/include/gcc48/c++/bits/locale_classes.h:40,
                 from /opt/local/include/gcc48/c++/bits/ios_base.h:41,
                 from /opt/local/include/gcc48/c++/ios:42,
                 from /opt/local/include/gcc48/c++/istream:38,
                 from /opt/local/include/gcc48/c++/fstream:38,
                 from test_fstream_to_int.cc:1:
/opt/local/include/gcc48/c++/bits/basic_string.h:2402:5: note: template<class 
_CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> 
std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/opt/local/include/gcc48/c++/bits/basic_string.h:2402:5: note:   template 
argument deduction/substitution failed:
test_fstream_to_int.cc:6:6: note:   'std::fstream {aka 
std::basic_fstream<char>}' is not derived from 'const std::basic_string<_CharT, 
_Traits, _Alloc>'
  f + 42;
      ^
In file included from /opt/local/include/gcc48/c++/string:53:0,
                 from /opt/local/include/gcc48/c++/bits/locale_classes.h:40,
                 from /opt/local/include/gcc48/c++/bits/ios_base.h:41,
                 from /opt/local/include/gcc48/c++/ios:42,
                 from /opt/local/include/gcc48/c++/istream:38,
                 from /opt/local/include/gcc48/c++/fstream:38,
                 from test_fstream_to_int.cc:1:
/opt/local/include/gcc48/c++/bits/basic_string.tcc:708:5: note: template<class 
_CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> 
std::operator+(_CharT, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
     ^
/opt/local/include/gcc48/c++/bits/basic_string.tcc:708:5: note:   template 
argument deduction/substitution failed:
test_fstream_to_int.cc:6:6: note:   mismatched types 'const 
std::basic_string<_CharT, _Traits, _Alloc>' and 'int'
  f + 42;
      ^
In file included from /opt/local/include/gcc48/c++/string:53:0,
                 from /opt/local/include/gcc48/c++/bits/locale_classes.h:40,
                 from /opt/local/include/gcc48/c++/bits/ios_base.h:41,
                 from /opt/local/include/gcc48/c++/ios:42,
                 from /opt/local/include/gcc48/c++/istream:38,
                 from /opt/local/include/gcc48/c++/fstream:38,
                 from test_fstream_to_int.cc:1:
/opt/local/include/gcc48/c++/bits/basic_string.tcc:692:5: note: template<class 
_CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> 
std::operator+(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const _CharT* __lhs,
     ^
/opt/local/include/gcc48/c++/bits/basic_string.tcc:692:5: note:   template 
argument deduction/substitution failed:
test_fstream_to_int.cc:6:6: note:   mismatched types 'const _CharT*' and 
'std::basic_fstream<char>'
  f + 42;
      ^
In file included from /opt/local/include/gcc48/c++/string:52:0,
                 from /opt/local/include/gcc48/c++/bits/locale_classes.h:40,
                 from /opt/local/include/gcc48/c++/bits/ios_base.h:41,
                 from /opt/local/include/gcc48/c++/ios:42,
                 from /opt/local/include/gcc48/c++/istream:38,
                 from /opt/local/include/gcc48/c++/fstream:38,
                 from test_fstream_to_int.cc:1:
/opt/local/include/gcc48/c++/bits/basic_string.h:2365:5: note: template<class 
_CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> 
std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, const 
std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/opt/local/include/gcc48/c++/bits/basic_string.h:2365:5: note:   template 
argument deduction/substitution failed:
test_fstream_to_int.cc:6:6: note:   'std::fstream {aka 
std::basic_fstream<char>}' is not derived from 'const std::basic_string<_CharT, 
_Traits, _Alloc>'
  f + 42;
      ^
In file included from /opt/local/include/gcc48/c++/bits/stl_algobase.h:67:0,
                 from /opt/local/include/gcc48/c++/bits/char_traits.h:39,
                 from /opt/local/include/gcc48/c++/ios:40,
                 from /opt/local/include/gcc48/c++/istream:38,
                 from /opt/local/include/gcc48/c++/fstream:38,
                 from test_fstream_to_int.cc:1:
/opt/local/include/gcc48/c++/bits/stl_iterator.h:333:5: note: template<class 
_Iterator> std::reverse_iterator<_Iterator> std::operator+(typename 
std::reverse_iterator<_Iterator>::difference_type, const 
std::reverse_iterator<_Iterator>&)
     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
     ^
/opt/local/include/gcc48/c++/bits/stl_iterator.h:333:5: note:   template 
argument deduction/substitution failed:
test_fstream_to_int.cc:6:6: note:   mismatched types 'const 
std::reverse_iterator<_Iterator>' and 'int'
  f + 42;
      ^

For completeness,

$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin13/4.8.2/lto-wrapp
er
Target: x86_64-apple-darwin13
Configured with: 
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org
_release_tarballs_ports_lang_gcc48/gcc48/work/gcc-4.8.2/configure 
--prefix=/opt/local --build=x86_64-apple-darwin13 
--enable-languages=c,c++,objc,obj-c++,lto,fortran,java 
--libdir=/opt/local/lib/gcc48 --includedir=/opt/local/include/gcc48 
--infodir=/opt/local/share/info --mandir=/opt/local/share/man 
--datarootdir=/opt/local/share/gcc-4.8 --with-local-prefix=/opt/local 
--with-system-zlib --disable-nls --program-suffix=-mp-4.8 
--with-gxx-include-dir=/opt/local/include/gcc48/c++/ --with-gmp=/opt/local 
--with-mpfr=/opt/local --with-mpc=/opt/local --with-cloog=/opt/local 
--enable-cloog-backend=isl --disable-cloog-version-check 
--enable-stage1-checking --disable-multilib --enable-lto 
--enable-libstdcxx-time --with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld 
--with-ar=/opt/local/bin/ar --with-bugurl=https://trac.macports.org/newticket 
--with-pkgversion='MacPorts gcc48 4.8.2_0'
Thread model: posix
gcc version 4.8.2 (MacPorts gcc48 4.8.2_0)

So I have tried to build pdf2djvu with your patch,

$ wgets https://pdf2djvu.googlecode.com/files/pdf2djvu_0.7.17.tar.gz
$ tar -xvf pdf2djvu_0.7.17.tar.gz
$ cd pdf2djvu-0.7.17/

$ patch system.cc ../issue88.diff
patching file system.cc
patching file system.hh

(I needed also this patch:
--- tools/xml2c~    2013-05-30 22:22:26.000000000 +0200
+++ tools/xml2c 2013-11-23 20:18:06.000000000 +0100
@@ -6,7 +6,7 @@
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; version 2 dated June, 1991.

-exec sed \
+exec gsed \
   -e '/<!--# *\(.*\) *#-->/ { s//\1/; b; }' \
   -e '/<!--.*-->/ { s///g; b; }' \
   -e 's/\\\\/\\\\/g' \

)

$ ./configure CC=clang CXX=clang++
$ make

Now it builds and seems to work (I have tried with some PDF file..)

Ciao,
 Angelo.

Original comment by graziosi...@gmail.com on 23 Nov 2013 at 7:28

GoogleCodeExporter commented 9 years ago 
tools/xml2c indeed doesn't work with non-GNU sed. This should hopefully be 
fixed in r9e673a76694d.

I've been able to reproduce the build failure using clang++ with the 
-std=libc++ option. I suppose this is the default on OSX.

The problem appears to be that in C++98 mode libc++'s defines the following 
operator for std::basic_ios:

operator bool() const {return !fail();}

This makes objects deriving from std::basic_ios implicitly convertible to int.

This does not happen in C++11 mode (-std=gnu++11), because then the operator is 
declared as:

explicit operator bool() const {return !fail();}

This also doesn't happen in GCC, since it implements "void*()" conversion 
operator instead, as required by the C++98 standard:

operator void*() const
{ return this->fail() ? 0 : const_cast<basic_ios*>(this); }

Original comment by jwilk@jwilk.net on 27 Nov 2013 at 11:53

GoogleCodeExporter commented 9 years ago 
Thanks for clarification :)

Ciao,
  Angelo.

Original comment by graziosi...@gmail.com on 27 Nov 2013 at 1:39

GoogleCodeExporter commented 9 years ago 
Typo in message #3: instead of "-std=libc++" it should be "-stdlib=libc++".

Original comment by jwilk@jwilk.net on 13 Apr 2014 at 5:18

GoogleCodeExporter commented 9 years ago 

With he attached file , when i compile the code the clang++ compiler , getting 
error with "no viable operator overload" with -stdlib=libc++. 
Iam using clang version of 5.0 and if i use clang version of 5.1 , the problem 
is resolved. Is it a clang compiler  bug

Original comment by emb.mal...@gmail.com on 4 Jun 2014 at 7:53

Attachments:

GoogleCodeExporter commented 9 years ago 
Should be fixed in pdf2djvu 0.7.18.

Original comment by jwilk@jwilk.net on 18 Dec 2014 at 1:00