CMake module for building Ragel machine files.
2014-05-10, Georg Sauthoff mail@georg.so
Ragel is a parser generator for regular languages with some advanced features. In some aspects it is similar to Lex/Flex but without the need to use a certain buffering scheme, more flexible, not restricted to a scanner approach and has rich support for regular language operators and user defined actions. The ragel binary takes a regular state machine description as input and generates efficient C/C++/... code.
The example CMakeLists.txt project shows how to use the FindRAGEL.cmake
module (additional comments are in the module itself). It builds 2 Ragel
example programs (located in the example sub-directory).
You can build them like this:
$ mkdir build
$ cd build
$ cmake ../CMakeLists.txt ..
-- The CXX compiler identification is GNU 4.8.2
-- The C compiler identification is GNU 4.8.2
-- Check for working CXX compiler: /usr/lib64/ccache/c++
-- Check for working CXX compiler: /usr/lib64/ccache/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working C compiler: /usr/lib64/ccache/cc
-- Check for working C compiler: /usr/lib64/ccache/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Found RAGEL: /usr/bin/ragel (found suitable version "6.6", minimum required is "6.6")
-- Configuring done
-- Generating done
-- Build files have been written to: /home/gms/program/cmake_ragel/build
$ make
Scanning dependencies of target nested
[ 25%] Building CXX object CMakeFiles/nested.dir/nested.cc.o
Linking CXX executable nested
[ 50%] Built target nested
[ 75%] [RAGEL][number] Compiling state machine with Ragel 6.6
Scanning dependencies of target number
[100%] Building C object CMakeFiles/number.dir/number.c.o
Linking C executable number
[100%] Built target number
You can also use an alternative build file generator:
$ mkdir build
$ cd build
$ cmake ../CMakeLists.txt -G Ninja ..
-- The CXX compiler identification is GNU 4.8.2
-- The C compiler identification is GNU 4.8.2
-- Check for working CXX compiler using: Ninja
-- Check for working CXX compiler using: Ninja -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working C compiler using: Ninja
-- Check for working C compiler using: Ninja -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Found RAGEL: /usr/bin/ragel (found suitable version "6.6", minimum required is "6.6")
-- Configuring done
-- Generating done
-- Build files have been written to: /home/gms/program/cmake_ragel/build
$ ninja-build
[6/6] Linking CXX executable nested
Usage notes for the examples are included in the source files.
There is also a ticket on adding a FindRAGEL module in the cmake bug tracker.