The gcc source distribution is a stand-alone distribution.
It is designed to be unpacked (producing the gcc
source tree) and built as is, assuming certain
prerequisites are met (including the availability of compatible
UNIX programs such as make, cc, and so on).
However, before building gcc, you will want to unpack
and merge the g77 distribution in with it, so that you
build a Fortran-capable version of gcc, which includes
the g77 command, the necessary run-time libraries,
and this manual.
Unlike gcc, the g77 source distribution
is not a stand-alone distribution.
It is designed to be unpacked and, afterwards, immediately merged
into an applicable gcc source tree.
That is, the g77 distribution augments a
gcc distribution--without gcc, generally
only the documentation is immediately usable.
A sequence of commands typically used to unpack gcc
and g77 is:
sh# cd /usr/src sh# gunzip -c /usr/FSF/gcc-2.8.1.tar.gz | tar xf - sh# gunzip -c /usr/FSF/g77-0.5.23.tar.gz | tar xf - sh# ln -s gcc-2.8.1 gcc sh# ln -s g77-0.5.23 g77 sh# mv -i g77/* gcc
Notes: The commands beginning with `gunzip...' might
print `Broken pipe...' as they complete.
That is nothing to worry about, unless you actually
hear a pipe breaking.
The ln commands are helpful in reducing typing
and clutter in installation examples in this manual.
Hereafter, the top level of gcc source tree is referred to
as `gcc', and the top level of just the g77
source tree (prior to issuing the mv command, above)
is referred to as `g77'.
There are three top-level names in a g77 distribution:
g77/COPYING.g77 g77/README.g77 g77/f
All three entries should be moved (or copied) into a gcc
source tree (typically named after its version number and
as it appears in the FSF distributions--e.g. `gcc-2.8.1').
`g77/f' is the subdirectory containing all of the
code, documentation, and other information that is specific
to g77.
The other two files exist to provide information on g77
to someone encountering a gcc source tree with g77
already present, who has not yet read these installation
instructions and thus needs help understanding that the
source tree they are looking at does not come from a single
FSF distribution.
They also help people encountering an unmerged g77 source
tree for the first time.
Note: Please use only gcc and g77
source trees as distributed by the FSF.
Use of modified versions is likely to result in problems that appear to be
in the g77 code but, in fact, are not.
Do not use such modified versions
unless you understand all the differences between them and the versions
the FSF distributes--in which case you should be able to modify the
g77 (or gcc) source trees appropriately so g77
and gcc can coexist as they do in the stock FSF distributions.
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