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Building and Installing System_Log
==================================
Requirements
------------
These instructions assume a Unix-like system with the GNAT tools and GNU Make.
The makefiles may not work with other clones and forks of Make. Use GNU Make if
possible; it is sometimes available as "gmake" on non-GNU systems. 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.
GPRbuild is used by default but Gnatmake can be used instead.
Basic Installation
------------------
The simplest way to build and install System_Log 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" will build a very simple demo program that can be used to check
that the library is usable.
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 directories project, if your system has one and you
want to install to the directories it specifies. A directories project is a
GNAT project file that defines directory variables for use by other project
files. Multiarch support requires a directories project that can refer to
different directories depending on the target architecture. A directories
project overrides the default values of some of the directory variables
listed below, but if one of those variables is set explicitly, then it
overrides the directories project.
relocatable_package
If relocatable_package is true and no directories project is provided, then
the project file that will be installed with the library will be configured
with relative pathnames so that the installed directory tree as a whole can
be moved to another location in the filesystem without breaking the project
file. Default: false
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 programs, binary libraries and
other architecture-specific files. Default: <prefix>
datarootdir
The root of the directory tree for read-only architecture-independent data
files. Default: <prefix>/share
includedir
The top-level directory for source files to be used in the compilation of
software using libraries; may be provided by a directories project.
Default: <prefix>/include
libdir
The directory for binary libraries to be used by other software, and the
top-level directory for other architecture-specific files; may be provided
by a directories project. Default: <exec_prefix>/lib
alidir
The parent of the library-specific directory for Ada library information
files for this library; may be provided by a directories project.
Default: <libdir>
gprdir
The directory for GNAT project files to be used in the building of software
using libraries. If you set this to a directory that GPRbuild and Gnatmake
don't search by default, then you will need to add it to the project search
path when using this library, for example through the environment variable
GPR_PROJECT_PATH. 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 used when the project files are
preprocessed. They are derived from the Make variables above when the makefiles
invoke Gnatprep. You may need to define them if you run Gnatprep manually.
Directories_GPR
The filename of the directories project, if any; corresponding to dirgpr.
Directories_Project
The name of the directories project, if any. This is supposed to be the
filename without a path or a suffix.
Prefix
Exec_Prefix
Includedir
Libdir
Alidir
These correspond to the like-named Make variables. The same defaults as
above will be used if the symbols are undefined.
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 or Gnatmake.
Default: gprbuild
GNATPREPFLAGS
A space-separated list of options to be passed to Gnatprep.
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.
GNATBINDFLAGS
A space-separated list of options to be passed to Gnatbind, used only if
GNATFLAGS is undefined and only when binding the demo program.
GNATLINKFLAGS
A space-separated list of options to be passed to Gnatlink, used only if
GNATFLAGS is undefined, only if the builder is Gnatmake, and only when
linking the demo program.
LDFLAGS
A space-separated list of options to be passed to the linker.
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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