Hello I'm coming back to C++ after long years spent on other technologies and i'm stuck on some weird behavior when calling some methods taking std::string as parameters : An example of call : LocalNodeConfiguration *LocalNodeConfiguration::ReadFromFile(std::string & path) { // ... throw configuration_file_error(string("Configuration ...
I was trying to use the random function in Ubuntu compiling with g++ on a larger program and for some reason rand just gave weird compile errors. For testing purposes I made the simplest program I could and it still gives errors. Program: #include <iostream> using std::cout; using std::endl; #include <cstdlib> int main() { cout ...
I am trying to define a full specialization of std::basic_string< char, char_traits<char>, allocator<char> > which is typedef'd (in g++) by the <string> header. The problem is, if I include <string> first, g++ sees the typedef as an instantiation of basic_string and gives me errors. If I do my specialization first then I have no issues...
Hello I'm trying to start with autoconf / automake for a new project. To get started, I'm reading "Using GNU Autotools" and trying to build the Hello-World-Tutorial. The required files from page 96 (real Page=105 because it's a LaTeX-Presentation) configure.ac, Makefile.am and src/Makefile.am look exactly as stated in the document. Af...
Hi. I'm trying to compile code in g++ and I get the following errors: In file included from scanner.hpp:8, from scanner.cpp:5: parser.hpp:14: error: ‘Scanner’ does not name a type parser.hpp:15: error: ‘Token’ does not name a type Here's my g++ command: g++ parser.cpp scanner.cpp -Wall Here's parser.hpp: #ifndef PA...
I am using cygwin libraries to run C and C++ programs on Windows. gcc runs fine, but with g++, I get a long list of errors. I think these erros are because of linking problems with C libraries. Can you suggest what I need to do to fix this? beginning error lines: In file included from testgpp.cpp:1: /cygdrive/c/cygwin/bin/../lib/gc...
I am building using zlib.h which I have a local copy to v1.2.5, but in /usr/include/zlib.h there is v1.2.1.2. If I omit adding -I/my/path/to/zlib to my make I get error from using old version which doesn't have Z_FIXED: g++ -g -Werror -Wredundant-decls -D_FILE_OFFSET_BITS=64 -c -o ARCH.linux_26_i86/debug/sysParam.o sysParam.cpp sysPara...
This might be a silly question, but... I've been writing a number of classes that utilize non-copyable members. These classes are never initialized via the copy constructor in my source. When I try to compile without supplying my own copy-constructor, g++ throws out many errors about how it can't build a default copy constructor, due ...
What does '#if _LFS64_LARGEFILE-0' mean to the C Preprocessor for g++? Is that a minus zero or is that part of the symbol? If it is minus zero, how does that affect whether the #if is triggered? ...
I'm compiling a c++ program using g++ and ld. I have a .so library I want to be used during linking. However, a library of the same name exists in /usr/local/lib, and ld is choosing that library over the one I'm directly specifying. How can I fix this? For the examples below, my library file is /my/dir/libfoo.so.0. Things I've tried tha...
I'm using Ubuntu Server 9.10 AMD Phenom 2 cpu g++ (Ubuntu 4.4.1-4ubuntu9) 4.4.1 trying to run the application pftp-shit v 1.11, which runs successfully until the remote file list is going to be saved (into .pftp//pftpfxp--). The following code in tcp.cc is executed successfully: int outfile_fd = open(name, O_CREAT | O_TRUNC | O_RDWR |...
I recently switched to Linux and wanted to compile my Visual Studio 2010 C++ source code, which uses only the STL, on G++. My Linux machine currently isn't available but I can try to tell you what is going on, first: As I try to compile my project, all global variables I use in main and which perfectly work on MSVC result in myGlobalV...
In general, I want warnings of unsigned vs signed. However, in this particular case, I want it suppressed; std::vector<Blah> blahs; for(int i = 0; i < blahs.size(); ++i) { ... I want to kill this comparison. Thanks! (using g++) ...
Using boost 1.4.2 asio in a c++ app and getting linux compiler warnings i don't grok. still here? The app i'm working on needs a "socket" that might be an ssl socket or a regular tcp socket so we hide specifics behind a template "socket" class that takes either an ssl socket class or tcp socket class as template parameter - below is the...
We have a body of C++ code which is being ported from a RHEL4-based distro to RHEL-5-based. It used to compile with g++ 3.4.3, and now compiles with g++ 4.1.2. It turns out that there are local POD variables that are being used uninitialized, which is causing failures under the new environment -- not surprising, since C++ rules say that ...
I noticed that there are two ways to create C++ objects: BTree *btree = new BTree; and BTree btree; From what I can tell, the only difference is in how class objects are accessed (. vs. -> operator), and when the first way is used, private integers get initialized to 0. Which way is better, and what's the difference? How do you k...
I'm working on converting a Linux project of mine to compile on Windows using MinGW. It compiles and runs just fine on Linux, but when I attempt to compile it with MinGW it bombs out with the following error message: camera.h:11: error: declaration does not declare anything camera.h:12: error: declaration does not declare anything I'm...
I was wondering which is the default memory allocator in G++ 4.4.1, on Ubuntu 9.1. I am interested in comparing different C++ allocators in a multithreaded environment. And where can I get more information about the default memory allocator? EDIT: I refer to new and delete operators. The only linking is to rt and pthread Regards ...
I do not understand the documentation for gprof regarding how to compile your program for profiling with gprof. In g++, is it required to compile with the -g option (debugging information) in a addition to the -pg option or not. In each case I get different results, and I would like to see where the bottlenecks in my application are in r...
Can I install an older version of gcc/g++ (4.1.3) on the latest Ubuntu (which comes with 4.4.3) and use it to compile a .so which should run on CentOS? The binary compiled with the Ubuntu version of gcc fails to load on CentOS because of missing imports (GLIB_2_11, ...). I need C++ (including exceptions), so I can't just statically link ...