05-14-2006
Quote:
Originally Posted by jim mcnamara
1. this forum is really not for homework
2. if gcc reports syntax errors, that means the code needs to be changed.
3. gcc myfile.c compiles C code not C++ code.
4. g++ myfile.cpp compiles C++ code
C++ and C are very different languages, compilers that expect C (gcc) will not compile C++ code.
ok, this is sort of a misconception. gcc compiles both. I just finished an ADMIN control area in C++ with the .cpp extension and compiled it with gcc without problem. but in response to the actual problem here, id just use this line.
we'll call the source EXAMPLE.cpp, and the output will be EXOUT."file".
gcc -lg++ -Wall -pedantic -ansi -g -o EXOUT EXAMPLE.cpp
this is a good choice for debugging and compiling, it calls upon the normal system area for #include header files, uses the Wall function for the debugging side of things, ansi for ..... ansi compatibility i think and the -o gets rid of the a.out leaving you with the desired file, with the blank extension for linux/Unix.... hope that helped..Pe@cE
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LEARN ABOUT NETBSD
__builtin_constant_p
__BUILTIN_CONSTANT_P(3) BSD Library Functions Manual __BUILTIN_CONSTANT_P(3)
NAME
__builtin_constant_p -- GNU extension to determine compile time constants
SYNOPSIS
int
__builtin_constant_p(value);
DESCRIPTION
The __builtin_constant_p() is a GNU extension for determining whether a value is known to be constant at compile time. The function is
closely related to the concept of ``constant folding'' used by modern optimizing compilers.
If the value is known to be a compile-time constant, a value 1 is returned. If __builtin_constant_p() returns 0, the value is not a compile-
time constant in the sense that gcc(1) was unable to determine whether the value is constant or not.
EXAMPLES
A typical example of the use of __builtin_constant_p() involves a situation where it may be desirable to fold the computation if it involves
a constant, but a function call is needed otherwise. For instance, bswap16(3) is defined in NetBSD as:
#define bswap16(x)
(__builtin_constant_p((x)) ?
__byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
SEE ALSO
gcc(1), __builtin_object_size(3), __builtin_return_address(3)
CAVEATS
This is a non-standard, compiler-specific extension.
BSD
December 19, 2010 BSD