To specify a directory to search for (binary) libraries, you just use -L: -L/data[…]/lib To specify the actual library name, you use -l: -lfoo # (links libfoo.a or libfoo.so) To specify a directory to search for include files (different from libraries!) you use -I: -I/data[…]/lib So I think what you want is something like g++ … Read more
A .gch file is a precompiled header. If a .gch is not found then the normal header files will be used. However, if your project is set to generate pre-compiled headers it will make them if they don’t exist and use them in the next build. Sometimes the *.h.gch will get corrupted or contain outdated … Read more
This is because you have the following code: class JSONDeserializer { Value JSONDeserializer::ParseValue(TDR type, const json_string& valueString); }; This is not valid C++ but Visual Studio seems to accept it. You need to change it to the following code to be able to compile it with a standard compliant compiler (gcc is more compliant to … Read more
It is basically a header file that also includes every standard library and STL include file. The only purpose I can see for it would be for testing and education. Se e.g. GCC 4.8.0 /bits/stdc++.h source. Using it would include a lot of unnecessary stuff and increases compilation time. Edit: As Neil says, it’s an … Read more
The error message clearly says that the default constructor has been deleted implicitly. It even says why: the class contains a non-static, const variable, which would not be initialized by the default ctor. class X { const int x; }; Since X::x is const, it must be initialized — but a default ctor wouldn’t normally … Read more
I use it all the time in my coding. The -ansi flag is equivalent to -std=c89. As noted, it turns off some extensions of GCC. Adding -pedantic turns off more extensions and generates more warnings. For example, if you have a string literal longer than 509 characters, then -pedantic warns about that because it exceeds … Read more
Consider: struct A { int i; int j; A() : j(0), i(j) { } }; Now i is initialized to some unknown value, not zero. Alternatively, the initialization of i may have some side effects for which the order is important. E.g. A(int n) : j(n++), i(n++) { }
C99 and C++ standards require non-void functions to return a value, except main. The missing return statement in main will be defined (to return 0). In C++ it’s undefined behaviour if execution actually reaches the end of a non-void function other than main, while in C it’s only UB if the caller uses the return … Read more
SFINAE only works if substitution in argument deduction of a template argument makes the construct ill-formed. There is no such substitution. I thought of that too and tried to use std::is_same< T, int >::value and ! std::is_same< T, int >::value which gives the same result. That’s because when the class template is instantiated (which happens … Read more
You can do this with make – with gnu make it is the -j flag (this will also help on a uniprocessor machine). For example if you want 4 parallel jobs from make: make -j 4 You can also run gcc in a pipe with gcc -pipe This will pipeline the compile stages, which will … Read more