[Log4cplus-devel] [log4cplus:bugs] #344 liblog4cplus. a linux library - compilation for std=c++11

[Václav H. <wi...@us...>]

- Description has changed:

Diff:

~~~~

--- old
+++ new
@@ -3,7 +3,7 @@
 I am using a Visual Studio GDB project and I have a problem including the liblog4cplus. a static library in  the linker inputs. 
 This are the errors received:
 
-```
+```text
 ..\..\Dependencies\log4cplus-1.2.1\.libs\liblog4cplus.a(liblog4cplus_la-appender.o): In function `void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>(char*, char*, std::forward_iterator_tag)':
 2>\usr\include\c++\5\bits\basic_string.tcc(223): error : undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_create(unsigned long&, unsigned long)'
 2>..\..\..\Dependencies\log4cplus-1.2.1\.libs\liblog4cplus.a(liblog4cplus_la-appender.o): In function `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator=(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&&)':
@@ -15,7 +15,7 @@
 In order compile the library with c++11 I added the command -std=c++11 in the configure file(CXXFLAGS = "-std=c++11") 
 This are the parts from configure file which I changed:
 
-```
+```sh
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_cxx_compiler_gnu" >&5
 $as_echo "$ac_cv_cxx_compiler_gnu" >&6; }

~~~~




---

** [bugs:#344] liblog4cplus. a linux library - compilation for std=c++11**

**Status:** open
**Group:** v1.1.3
**Created:** Mon Jul 29, 2019 02:53 PM UTC by Andreea Furnica
**Last Updated:** Mon Jul 29, 2019 04:43 PM UTC
**Owner:** nobody
**Attachments:**

- [configure](https://sourceforge.net/p/log4cplus/bugs/344/attachment/configure) (788.3 kB; text/plain)


Hello,

I am using a Visual Studio GDB project and I have a problem including the liblog4cplus. a static library in  the linker inputs. 
This are the errors received:

```text
..\..\Dependencies\log4cplus-1.2.1\.libs\liblog4cplus.a(liblog4cplus_la-appender.o): In function `void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>(char*, char*, std::forward_iterator_tag)':
2>\usr\include\c++\5\bits\basic_string.tcc(223): error : undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_create(unsigned long&, unsigned long)'
2>..\..\..\Dependencies\log4cplus-1.2.1\.libs\liblog4cplus.a(liblog4cplus_la-appender.o): In function `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator=(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&&)':
2>\usr\include\c++\5\bits\basic_string.h(589): error : undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::swap(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
```

It seems that the library is not recognised as being compiled with -std=c++11 

In order compile the library with c++11 I added the command -std=c++11 in the configure file(CXXFLAGS = "-std=c++11") 
This are the parts from configure file which I changed:

```sh
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_cxx_compiler_gnu" >&5
$as_echo "$ac_cv_cxx_compiler_gnu" >&6; }
if test $ac_compiler_gnu = yes; then
  GXX=yes
else
  GXX=
fi
ac_test_CXXFLAGS=${CXXFLAGS+set}
ac_save_CXXFLAGS=$CXXFLAGS
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX accepts -g" >&5
$as_echo_n "checking whether $CXX accepts -g... " >&6; }
if ${ac_cv_prog_cxx_g+:} false; then :
  $as_echo_n "(cached) " >&6
else
  ac_save_cxx_werror_flag=$ac_cxx_werror_flag
   ac_cxx_werror_flag=yes
   ac_cv_prog_cxx_g=no
   CXXFLAGS="-g -std=c++11"
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h.  */

int
main ()
{

  ;
  return 0;
}
_ACEOF
if ac_fn_cxx_try_compile "$LINENO"; then :
  ac_cv_prog_cxx_g=yes
else
  CXXFLAGS="-std=c++11"
      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h.  */

int
main ()
{

  ;
  return 0;
}
_ACEOF
if ac_fn_cxx_try_compile "$LINENO"; then :

else
  ac_cxx_werror_flag=$ac_save_cxx_werror_flag
	 CXXFLAGS="-g -std=c++11"
	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h.  */

int
main ()
{

  ;
  return 0;
}
_ACEOF
if ac_fn_cxx_try_compile "$LINENO"; then :
  ac_cv_prog_cxx_g=yes
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
   ac_cxx_werror_flag=$ac_save_cxx_werror_flag
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cxx_g" >&5
$as_echo "$ac_cv_prog_cxx_g" >&6; }
if test "$ac_test_CXXFLAGS" = set; then
  CXXFLAGS=$ac_save_CXXFLAGS
elif test $ac_cv_prog_cxx_g = yes; then
  if test "$GXX" = yes; then
    CXXFLAGS="-g -O2 -std=c++11"
  else
    CXXFLAGS="-g -std=c++11"
  fi
else
  if test "$GXX" = yes; then
    CXXFLAGS="-O2 -std=c++11"
  else
    CXXFLAGS="-std=c++11"
  fi
fi
```

The commad used to compile the library is:
sudo ./configure --enable-static

The compilation worked well.

I am using the log4cpuls 1.2.1 version and the gcc-5.4.0 version to compile the library.
I think the error from visual studio is related to c++11 compilation. 
Could you please tell me if the compilation procedure is ok?
If not, please tell which is the right procedure to compile the library for c++11?
Does the errors mean somenthing else?
Please find attached the configure file/



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