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Building and Installing the Ada Milter API
==========================================
Requirements
------------
These instructions assume a Unix-like system with the GNAT tools and GNU Make.
The makefiles may not work with other Make clones than GNU Make. If you can't
use Make you will need to manually preprocess some GNAT project files with
Gnatprep. If you have another Ada compiler than GNAT, then the included build
system will probably not work and you should do whatever that compiler requires
you to do to compile the code.
The project files require GPRbuild. Gnatmake won't do because this is a mixed-
language project.
Basic Installation
------------------
The simplest way to build and install the Ada Milter API is:
1: Go to the directory that contains this file and the makefiles, and run
"make" to build the library.
2: Run "make install" to copy the files to the default locations. You will
probably need root privileges if you install to the default locations.
Testing
-------
"make test_milter" will build a test milter that can be used to check that the
library works. The testing is not automated. A Mail Transfer Agent will need to
be configured to use the test milter, and some email messages will need to be
sent through that MTA.
Installation Directories
------------------------
By default the files are installed in directories under /usr/local. You can
specify other locations by setting variables on the Make command line, or on
the Gnatprep command line if you can't use Make. The following Make variables
are relevant during the build:
dirgpr
The filename of the directory project, if your system has one and you want
to install to the directories it specifies. A directory project is a GNAT
project file that defines directory variables for use by other project
files. Multilib support requires a directory project that can refer to
different directories depending on the target architecture. A directory
project overrides some but not all of the directory variables listed below.
prefix
A prefix used in the default values of the directory variables listed
below. Default: /usr/local
exec_prefix
A prefix used in the default locations for architecture-specific files.
Default: <prefix>
bindir
The directory for programs that can be run from a command prompt.
Default: <exec_prefix>/bin
datarootdir
The root of the directory tree for read-only architecture-independent data
files. Default: <prefix>/share
includedir
The directory for source files that are needed for compilation of code that
uses the library, used only if no directory project is provided.
Default: <prefix>/include
libdir
The directory for binary libraries and other architecture-specific files,
used only if no directory project is provided. Default: <exec_prefix>/lib
gprdir
The directory for GNAT project files. Default: <datarootdir>/gpr
If you want to install to a staging directory from which the files will later
be copied to their final locations, then set DESTDIR to the staging directory.
All the other directory variables shall be the final locations. Unlike the
variables listed above, DESTDIR is effective in the installation step.
The following preprocessor symbols are defined by the makefiles, and may be
defined manually if Make can't be used:
Directory_GPR
The filename of the directory project, if any; corresponding to dirgpr.
Directory_Project
The name of the directory project, if any. This is supposed to be the
filename without a path or a suffix.
Prefix
Exec_Prefix
Bindir
Includedir
Libdir
These correspond to the like-named Make variables.
Optional Thread Wrapper
-----------------------
The Ada Milter API contains a thread wrapper. It wraps threads that Libmilter
starts, and registers and unregisters them in the Ada run-time system. This may
be necessary on some platforms and works around a memory leak in some versions
of Libgnat, but can also trigger bugs in some older versions of Libgnat. The
thread wrapper is disabled by default. To enable it, set the variable
wrap_threads to "true" on the Make or Gnatprep command line.
Build Tools and Options
-----------------------
The following variables, which may be set in the environment or on the Make
command line, control which programs are invoked to do the build and which
options are passed to them:
GNATPREP
The command for invoking Gnatprep, in case you want to use a nondefault
version of Gnatprep or a wrapper for example. Default: gnatprep
GNAT_BUILDER
The command for invoking the builder, that is GPRbuild. Default: gprbuild
GNATFLAGS
A space-separated list with all of the optional parameters to be passed to
the builder, including any options to be forwarded to the compiler, binder
and linker. If GNATFLAGS is defined it overrides the options variables
listed below.
GNAT_BUILDER_FLAGS
A space-separated list of options for the builder, used only if GNATFLAGS
is undefined. This may include not only options for the builder itself but
also command line separators (also called mode switches) followed by
options to be forwarded to the compiler, binder or linker.
ADAFLAGS
A space-separated list of options to be passed to the compiler when
compiling Ada code, used only if GNATFLAGS is undefined.
CFLAGS
A space-separated list of options to be passed to the compiler when
compiling C code, used only if GNATFLAGS is undefined.
LDFLAGS
A space-separated list of options to be passed to the linker, used only if
GNATFLAGS is undefined. (Unfortunately GPRbuild can't forward command line
options to the linker when linking a shared library, so LDFLAGS affects
only the test milter.)
Copyright of This File
----------------------
Copyright 2013 B. Persson, Bjorn@Rombobeorn.se
This material is provided as is, with absolutely no warranty expressed
or implied. Any use is at your own risk.
Permission is hereby granted to use or copy this documentation file
for any purpose, provided the above notices are retained on all copies.
Permission to modify the text and to distribute modified text is granted,
provided the above notices are retained, and a notice that the text was
modified is included with the above copyright notice.
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