perhapsmaple opened a new issue, #349:
URL: https://github.com/apache/logging-log4cxx/issues/349
Hi, I am trying to build log4cxx with the MultiprocessRollingFileAppender
using CMake with the following command:
```
cmake -B build -S . -DLOG4CXX_MULTIPROCESS_ROLLING_FILE_APPENDER=ON
-DCMAKE_CXX_STANDARD=17
```
When I build the project, I get the following error:
```
/home/harish/build/original-log4cxx/src/main/cpp/timebasedrollingpolicy.cpp:
In member function ‘const string
log4cxx::rolling::TimeBasedRollingPolicy::createFile(const string&, const
string&, log4cxx::helpers::Pool&)’:
/home/harish/build/original-log4cxx/src/main/cpp/timebasedrollingpolicy.cpp:181:21:
error: ‘log4cxx::filesystem’ has not been declared
181 | LOG4CXX_NS::filesystem::path path(fileName);
| ^~~~~~~~~~
/home/harish/build/original-log4cxx/src/main/cpp/timebasedrollingpolicy.cpp:182:35:
error: ‘path’ was not declared in this scope
182 | std::string newFilename = path.filename().string() + szUid +
suffix;
| ^~~~
/home/harish/build/original-log4cxx/src/main/cpp/timebasedrollingpolicy.cpp:182:35:
note: suggested alternatives:
In file included from /usr/include/c++/11/filesystem:45,
from
/home/harish/build/original-log4cxx/build/src/main/include/log4cxx/private/boost-std-configuration.h:9,
from
/home/harish/build/original-log4cxx/src/main/cpp/timebasedrollingpolicy.cpp:31:
/usr/include/c++/11/bits/fs_path.h:248:9: note:
‘std::filesystem::__cxx11::path’
248 | class path
| ^~~~
In file included from
/home/harish/build/original-log4cxx/src/main/cpp/timebasedrollingpolicy.cpp:31:
/home/harish/build/original-log4cxx/build/src/main/include/log4cxx/private/boost-std-configuration.h:12:35:
note: ‘{anonymous}::filesystem::path’
12 | typedef std::filesystem::path path;
| ^~~~
/home/harish/build/original-log4cxx/src/main/cpp/timebasedrollingpolicy.cpp:183:21:
error: ‘log4cxx::filesystem’ has not been declared
183 | LOG4CXX_NS::filesystem::path retval = path.parent_path() /
newFilename;
| ^~~~~~~~~~
/home/harish/build/original-log4cxx/src/main/cpp/timebasedrollingpolicy.cpp:184:16:
error: ‘retval’ was not declared in this scope
184 | return retval.string();
| ^~~~~~
gmake[2]: *** [src/main/cpp/CMakeFiles/log4cxx.dir/build.make:1868:
src/main/cpp/CMakeFiles/log4cxx.dir/timebasedrollingpolicy.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:1366:
src/main/cpp/CMakeFiles/log4cxx.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2
```
After scratching my head for a bit, I found the boost-std-configuration.h
file inside my cmake build folder:
```
#ifndef BOOST_STD_CONFIGURATION_H
#define BOOST_STD_CONFIGURATION_H
#define STD_FILESYSTEM_FOUND 1
#define Boost_FILESYSTEM_FOUND 0
#define STD_EXPERIMENTAL_FILESYSTEM_FOUND 1
#if STD_FILESYSTEM_FOUND
#include <filesystem>
namespace {
namespace filesystem {
typedef std::filesystem::path path;
}
}
#elif STD_EXPERIMENTAL_FILESYSTEM_FOUND
#include <experimental/filesystem>
namespace {
namespace filesystem {
typedef std::experimental::filesystem::path path;
}
}
#elif Boost_FILESYSTEM_FOUND
#include <boost/filesystem.hpp>
namespace {
namespace filesystem {
typedef boost::filesystem::path path;
}
}
#endif
#endif /* BOOST_STD_CONFIGURATION_H */
```
which is generated by this:
```
configure_file(${LOG4CXX_SOURCE_DIR}/src/cmake/boost-fallback/boost-std-configuration.h.cmake
${CMAKE_CURRENT_BINARY_DIR}/log4cxx/private/boost-std-configuration.h
```
That value is not set and comes up empty when trying to print with:
```message (NAMESPACE=${NAMESPACE_ALIAS})```
gives the following in the output:```NAMESPACE=```
The build errors do go away when built with the CMake option
```-DLOG4CXX_NS="log4cxx"```
I'm happy to help with any further investigations.
Built latest log4cxx with ```gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0```
Thanks
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