The difference between GCC and g++

First describe the error you encountered today:

Because before writing the program, write is CPP file, and then directly use g++ compile, no error, also did not care about these problems, today there is a C file, but contains after the STL vector syntax, think of using GCC to compile, the result error, error is: Can't find the vector.

What is gcc/g++

First of all: GCC and GCC are two different things

Gcc:gnu Compiler Collection (GUN compiler Collection), it can compile C, C + +, JAV, Fortran, Pascal, Object-c, Ada and other languages.

GCC is the gun C Compiler (C compiler) in GCC

G++ is the gun C + + Compiler (c + + compiler) in GCC

An interesting fact is that, in essence, GCC and g++ are not compilers, nor are they collections of compilers, they are just a kind of drive, depending on the type of file to be compiled in the parameter, call the corresponding gun compiler, for example, to compile a C file with GCC, there are several steps:

Step1:call a preprocessor, like CPP.

Step2:call an actual compiler, like CC or CC1.

Step3:call an assembler, like as.

Step4:call a linker, like LD

Because the compiler can be replaced, GCC can not only compile C files

So, more accurately, GCC calls C compiler, and g++ calls C + + compiler

The main differences between GCC and g++

1. For *.c and *.cpp files, GCC is compiled as C and CPP files respectively (c and CPP are not the same syntax strength)

2. For *.c and *.cpp files, g++ is unified as CPP file compilation

3. When compiling files using g++,g++ automatically links the standard library STL, and GCC does not automatically link the STL

4. GCC when compiling c file, can use the predetermined macros is relatively few

5. When compiling CPP files, gcc/g++ when compiling C files and CPP files (when both GCC and g++ invoke the CPP file compiler), some additional macros are added as follows:

#define __GXX_WEAK__ 1
#define __cplusplus 1
#define __DEPRECATED 1
#define __GNUG__ 4
#define __exceptions 1
#define __PRIVATE_EXTERN__ extern

6. When compiling C + + files with gcc, it is necessary to add parameter –lstdc++ in order to be able to use STL , but this does not mean that gcc–lstdc++ and g++ are equivalent, they are not only the difference between this

Main parameters

-g-turn on debugging (so GDB gives morefriendly output)

-wall-turns on most warnings

-O Or-o2-turn on optimizations

-o-name of the output file

-c-output an Object file (. O)

-i-specify an Includedirectory

-l-specify a Libdirectory

-l-link with LIBRARYLIB.A

Use example: g++-ohelloworld-i/homes/me/randomplace/include HelloWorld. C

The difference between GCC and g++