LIBRARY_PATH is used by gcc before compilation to search directories containing static and shared libraries that need to be linked to your program. LD_LIBRARY_PATH is used by your program to search directories containing shared libraries after it has been successfully compiled and linked. EDIT: As pointed below, your libraries can be static or shared. If … Read more
You can use the -Q –help=target options: gcc -march=native -Q –help=target … The -v option may also be of use. You can see the documentation on the –help option here.
The package you’re looking for is confusingly named gcc-c++.
You need to actually define the static member somewhere (after the class definition). Try this: class Foo { /* … */ }; const int Foo::MEMBER; int main() { /* … */ } That should get rid of the undefined reference.
Adding this answer partially because it fixed my problem of the same issue and so I can bookmark this question myself. I was able to fix it by doing the following: sudo apt-get install gcc-multilib g++-multilib If you’ve installed a version of gcc / g++ that doesn’t ship by default (such as g++-4.8 on lucid) … Read more
-w is the GCC-wide option to disable warning messages.
C99 way, also supported by VC++ compiler. #define FOO(fmt, …) printf(fmt, ##__VA_ARGS__)
One possible reason is because you are declaring a virtual function without defining it. When you declare it without defining it in the same compilation unit, you’re indicating that it’s defined somewhere else – this means the linker phase will try to find it in one of the other compilation units (or libraries). An example … Read more
This is a known bug under MinGW. Relevant Bugzilla. In the comments section you can get a patch to make it work with MinGW. This issue has been fixed in MinGW-w64 distros higher than GCC 4.8.0 provided by the MinGW-w64 project. Despite the name, the project provides toolchains for 32-bit along with 64-bit. The Nuwen … Read more
Make sure the members appear in the initializer list in the same order as they appear in the class Class C { int a; int b; C():b(1),a(2){} //warning, should be C():a(2),b(1) } or you can turn -Wno-reorder