log4cpp build/compile in mingw envrionment

Recently, we have one project which need porting linux program to windows.

Because this project used log4cpp to do logging operation, we log4cpp also need be ported.

Here I will record each issue during porting process.

1. Missing “config-MinGW32.h”, this is a common issue at the beginning. I think log4cpp developer forgot to packing this header file when release package.

This file can be found in CVS of log4cpp project.

2. ‘long long long’ is too long for GCC

$ g++ -I. -I../include -I../include -O2 -DNDEBUG -Wall -Wno-unused -pedantic –

MT Appender.lo -MD -MP -MF .deps/Appender.Tpo -c Appender.cpp -DDLL_EXPORT -DP

IC -o .libs/Appender.o

In file included from c:\mingw\bin\../lib/gcc/mingw32/4.4.0/../../../../include/wchar.h:405,

from c:\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cwchar:47,

from c:\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/bits/postypes.h:42,

from c:\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/bits/char_traits.h:42,

from c:\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/string:42,

from ../include/log4cpp/Appender.hh:14,

from Appender.cpp:11:

c:\mingw\bin\../lib/gcc/mingw32/4.4.0/../../../../include/stdint.h:33: error: ‘long long long’ is too long for GCC

a) Add –g3 and -save-temps to see preprocess source.

We see in temp reprocess file “Appender.ii” there are one line “typedef long long long long”, this is because:

in <stdint.h> “ typedef long long int64_t”,

but in config-MinGW32.h, int64_t was defined as “#define int64_t __int64”

and in <_mingw.h> __int64 was defined as “#define __int64 long long”

So error happened.

To fixing this issue, I comment one line in “config-MinGW32.h”, LINE 20: “#define int64_t __int64”

3. dd

C:/msys/1.0/bin/sh.exe ../libtool –tag=CXX –mode=compile g++ -DHAVE_CONFIG_H -I. -I../include -I../include -O2 -DNDEBUG -Wall -Wno-unused -pedantic -MT PatternLayout.lo -MD -MP -MF .deps/PatternLayout.Tpo -c -o PatternLayout.lo PatternLayout.cpp

g++ -DHAVE_CONFIG_H -I. -I../include -I../include -O2 -DNDEBUG -Wall -Wno-unused -pedantic -MT PatternLayout.lo -MD -MP -MF .deps/PatternLayout.Tpo -c PatternLayout.cpp -DDLL_EXPORT -DPIC -o .libs/PatternLayout.o

PatternLayout.cpp: In member function ‘virtual void log4cpp::PatternLayout::setConversionPattern(const std::string&)’:

PatternLayout.cpp:373: error: call of overloaded ‘abs(int&)’ is ambiguous

c:\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cmath:94: note: candidates are: double std::abs(double)

c:\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cmath:98: note: float std::abs(float)

c:\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cmath:102: note: long double std::abs(long double)

a) changed to “abs((double)xxx)” in PatternLayout.cpp