This manual describes very briefly how to use the ConceptGCC
compiler. If you want to learn instead about the ConceptC++
language, please refer to the ConceptC++ tutorial or specification.
Using the Compiler
The ConceptGCC compiler driver is named conceptg++. It
provides the same behavior as GCC's g++ compiler driver, but
with several new command line options.
ConceptGCC has all of the same command-line options as the version
of GCC it is based on. However, it includes several
- -std=c++98 or -std=gnu++98 turns off support for all C++0x features, including concepts.
- -D_GLIBCXX_NO_CONCEPTS turns off concepts support in the C++
Standard Library but not in the compiler itself.
Improving Compilation Speed
ConceptGCC is much slower than its GCC counterpart. While we expect
this to improve with later versions of ConceptGCC, the best fix for
now is to
headers, especially for the ConceptGCC Standard Library. Most
users can just add the following command-line option to their
invocations of conceptg++:
Whenever concept support is available, ConceptGCC defines the
macro __GXX_CONCEPTS__. ConceptGCC will also
define __GXX_EXPERIMENTAL_CXX0X__ to indicate that it is in
the experimental C++0x mode of GCC 4.3.