Add CONTRIBUTING, and move the dev instructions into there.

CONTRIBUTING.rst

+CONTRIBUTING
+============
+
+To contribute code or documentation, submit a pull request at the
+`source repository website
+<https://code.uplex.de/uplex-varnish/libvmod-re2>`_.
+
+If you have a problem or discover a bug, you can post an `issue
+<https://code.uplex.de/uplex-varnish/libvmod-re2/issues>`_ at
+the website. You can also write to <varnish-support@uplex.de>.
+
+For developers
+--------------
+
+The VMOD source code is in C and C++, since the RE2 API is
+C++. Compilation has been tested with gcc/g++ and clang.
+
+The build specifies C99 conformance for C sources (``-std=c99``), and
+C++11 for C++ (``-std=c++11``). For both, all compiler warnings are
+turned on, and all warnings are considered errors (``-Werror -Wall
+-Wextra``).  The code MUST always build without warnings or errors
+under these constraints.
+
+By default, ``CFLAGS`` and ``CXXFLAGS`` are set to ``-g -O2``, so that
+symbols are included in the shared library, and optimization is at
+level ``O2``. To change or disable these options, set ``CFLAGS``
+and/or ``CXXFLAGS`` explicitly before calling ``configure`` (they may
+be set to the empty string).
+
+For development/debugging cycles, the ``configure`` option
+``--enable-debugging`` is recommended (off by default). This will turn
+off optimizations and function inlining, so that a debugger will step
+through the code as expected.
+
+By default, the VMOD is built with the stack protector enabled
+(compile option ``-fstack-protector``), but it can be disabled with
+the ``configure`` option ``--disable-stack-protector``.

README.rst

@@ -833,33 +833,6 @@ Other files such as this man-page are installed in the locations
 determined by ``configure``, which inherits its default ``--prefix``
 setting from Varnish.
 
-For developers
---------------
-
-The VMOD source code is in C and C++, since the RE2 API is
-C++. Compilation has been tested with gcc/g++ and clang.
-
-The build specifies C99 conformance for C sources (``-std=c99``), and
-C++11 for C++ (``-std=c++11``). For both, all compiler warnings are
-turned on, and all warnings are considered errors (``-Werror -Wall``).
-The code should always build without warnings or errors under these
-constraints.
-
-By default, ``CFLAGS`` and ``CXXFLAGS`` are set to ``-g -O2``, so that
-symbols are included in the shared library, and optimization is at
-level ``O2``. To change or disable these options, set ``CFLAGS``
-and/or ``CXXFLAGS`` explicitly before calling ``configure`` (they may
-be set to the empty string).
-
-For development/debugging cycles, the ``configure`` option
-``--enable-debugging`` is recommended (off by default). This will turn
-off optimizations and function inlining, so that a debugger will step
-through the code as expected.
-
-By default, the VMOD is built with the stack protector enabled
-(compile option ``-fstack-protector``), but it can be disabled with
-the ``configure`` option ``--disable-stack-protector``.
-
 LIMITATIONS
 ===========
 

src/vmod_re2.vcc

@@ -715,33 +715,6 @@ Other files such as this man-page are installed in the locations
 determined by ``configure``, which inherits its default ``--prefix``
 setting from Varnish.
 
-For developers
---------------
-
-The VMOD source code is in C and C++, since the RE2 API is
-C++. Compilation has been tested with gcc/g++ and clang.
-
-The build specifies C99 conformance for C sources (``-std=c99``), and
-C++11 for C++ (``-std=c++11``). For both, all compiler warnings are
-turned on, and all warnings are considered errors (``-Werror -Wall``).
-The code should always build without warnings or errors under these
-constraints.
-
-By default, ``CFLAGS`` and ``CXXFLAGS`` are set to ``-g -O2``, so that
-symbols are included in the shared library, and optimization is at
-level ``O2``. To change or disable these options, set ``CFLAGS``
-and/or ``CXXFLAGS`` explicitly before calling ``configure`` (they may
-be set to the empty string).
-
-For development/debugging cycles, the ``configure`` option
-``--enable-debugging`` is recommended (off by default). This will turn
-off optimizations and function inlining, so that a debugger will step
-through the code as expected.
-
-By default, the VMOD is built with the stack protector enabled
-(compile option ``-fstack-protector``), but it can be disabled with
-the ``configure`` option ``--disable-stack-protector``.
-
 LIMITATIONS
 ===========