"Gaurav Jain-SJR" <Gaurav.Jain@iflexsolutions.com> wrote on 11/19/2007 06:58:42 AM:
Hi,
// samp.cpp Boost Library Example #include <iostream> #include <string> #include <cstdlib> #include <fstream> #include "boost/filesystem/operations.hpp" #include "boost/filesystem/path.hpp" #include "boost/filesystem/exception.hpp" #include "boost/filesystem/convenience.hpp" #include "boost/filesystem/fstream.hpp" using namespace std;
int main( int argc, char* argv[] ) {
if ( argc != 2 ) { std::cout << "Usage: file_size path\n"; return 1; }
std::cout << "sizeof(intmax_t) is " << sizeof(boost::intmax_t) << '\n';
boost::filesystem::path p( argv[1], boost::filesystem::native );
if ( !boost::filesystem::exists( p ) ) { std::cout << "not found: " << argv[1] << std::endl; return 1; }
if ( boost::filesystem::is_directory( p ) ) { std::cout << "not a file: " << argv[1] << std::endl; return 1; }
std::cout << "size of " << argv[1] << " is " << boost::filesystem::file_size( p ) << std::endl; return 0; }
I tried to build the above sample which comes with BOOST File System library on AIX 5.3. It got failed at link time. The detail of this activity is as follow:
Compiler Details: XL C/C++ Enterprise Edition V9.0
OS Details:- AIX 5.3
Boost Version:- 1_34_0 (32 bit build)
Command for building the boost libraries:-
$bjam --v2 install toolset=vacpp --prefix=$HOME/1_34_1/32 --builddir=$HOME/tmp variant=release runtime-link=static,shared threading=single,multi --without-python Jamfile.v2
"samp.cpp":- Compilation Command
$xlC_r -q32 -I/home/1_34_0/include samp.cpp -L/home/1_34_0/lib -lboost_filesystem-xlc-mt-1_34
ld: 0711-317 ERROR: Undefined symbol: .boost::filesystem::detail::last_write_time_api( const std::basic_string<char,std::char_traits<char>,std::allocator<char>
&,int) ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
I tried to find a solution on google and came across with the following:
http://beta.boost.org/development/tests/trunk/output/IBM_Canada_Ltd-boos t-bin-v2-libs-filesystem-test-operations_test_dll-test-vacpp-debug.html
Even the regression test result on IBM site indicates that the certain test case of file system library isn't working:
http://www-1.ibm.com/support/docview.wss?rs=2030&context=SSJT9L&uid=swg2 7010184
I am not directly using the "boost::filesystem::detail::last_write_time_api" in my code, but I am not sure whether any other API's which I am using in my code, is using it indirectly.
Can somebody suggest me a work around to resolve this?
Regards, Gaurav Jain
The symbol referenced from operations_test.cpp, or in your case samp.cpp is: boost::filesystem::detail::last_write_time_api(const std::basic_string<char,std::char_traits<char>,std::allocator<char> >&,int) the symbol defined in the archive of Boost.Filesystem is: boost::filesystem::detail::last_write_time_api(const std::basic_string<char,std::char_traits<char>,std::allocator<char> >&,long) The problem originates with the last parameter, std::time_t, of the function boost::filesystem::detail::last_write_time_api(). In the Boost.Filesystem header, boost/filesystem/operations.hpp the function last_write_time() is declared as: last_write_time( const Path & ph, const std::time_t new_time) where std::time_t is typedef'ed to time_t which is defined as an int in /usr/include/time.h. However, inside libs/filesystem/src/operations.cpp where the definition of the function last_write_time() resides there is some code which changes the underlying type of time_t to a long ie) // enable the XPG-compliant version of readdir_r() on AIX #if defined(_AIX) # define _LINUX_SOURCE_COMPAT #endif This #define of _LINUX_SOURCE_COMPAT changes the time_t from an int to a long. So the declaration of last_write_time() has std::time_t as an int whereas the definition has std::time_t as a long, thus the link error message. There are two ways to fix this: 1) Compile samp.cpp with -D_LINUX_SOURCE_COMPAT but be warned this changes more than time_t 2) The best fix is to remove the define for LINUX_SOURCE_COMPAT and add checks around the call to readdir_r to make sure that _AIX and __THREAD_SAFE ie) the thread safe version of the compiler on AIX is being called so readdir_r() works correctly. Here is a libs/filesystem/src/operations.cpp patch for Boost trunk: (See attached file: operations.cpp.trunk.patch) Here is a libs/filesystem/src/operations.cpp patch for Boost.1.34.1: (See attached file: operations.cpp.1.34.patch) Chris Cambly IBM XL Compiler Development