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ed0bc95f5d
git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@2395 57a11ea4-9604-0410-9ed3-97b8803252fd
83 lines
3.6 KiB
Plaintext
83 lines
3.6 KiB
Plaintext
-*-text-*-
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===========================================================================
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Automake
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GnuCash uses automake to handle the build process. Make sure you
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understand what automake provides/requires before you add anything
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particularly fancy to the Makefile.am files.
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Most of the time, a "make" or "make install" will automatically DTRT
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and regenerate Makefiles or Makefile.ins, re-run configure, regenerate
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configure from configure.in, etc. whenever needed. However, it is
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possible, if you make a mistake when working on the Makefile.am's to
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leave yourself in a situation where automake won't work because a
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Makefile is broken. To fix this, just run:
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aclocal && autoconf && automake --add-missing
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That should sledgehammer the problem bit back into place.
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===========================================================================
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Adding files to AC_OUTPUT in configure.in.
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Please do not add any non-makefiles to AC_OUTPUT unless you're
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*absolutely* sure that it's safe and necessary to do so. If you're
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not sure, then please use the "generation with sed by hand approach"
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that we use for other non-makefiles like src/scm/bootstrap.scm. See
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src/scm/bootstrap.scm.in and src/scm/Makefile.in for details.
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The reasoning behind this is that there are often variables that
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autoconf uses and replaces via the @@ mechanism that are recursively
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defined in terms of other variables. For example, @datadir@ might
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expand into $prefix/share, which itself contains an unexpanded
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variable. Unless the @datadir@ replacement is performed on a file
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that will eventually be processed by make, there's no guarantee that
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the variable will *ever* be fully expanded and then your code will
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break.
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To get around this, we handle all non-makefiles (with a few notable
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exceptions) manually with sed. For example, we have
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src/scm/bootstrap.scm.in which is processed in src/scm/Makefile.in
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according to the following rule:
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## We borrow guile's convention and use @-...-@ as the substitution
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## brackets here, instead of the usual @...@. This prevents autoconf
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## from substituting the values directly into the left-hand sides of
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## the sed substitutions. *sigh*
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bootstrap.scm: bootstrap.scm.in
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rm -f $@.tmp
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sed < $@.in > $@.tmp \
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-e 's:@-VERSION-@:${VERSION}:g' \
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-e 's:@-GNC_CONFIGDIR-@:${GNC_SHAREDIR}:g' \
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-e 's:@-GNC_SHAREDIR-@:${GNC_CONFIGDIR}:g'
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chmod +x $@.tmp
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mv $@.tmp $@
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This approach guarantees that the variables referred to will be
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properly expanded at the right times.
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The only non-Makefiles files that must be handled directly by
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AC_OUTPUT are files that refer to variables that, when expanded, may
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have makefile-hostile characters like '#' in them like
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INCLUDE_LOCALE_H. These may need to be replaced directly in the
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relevant file via AC_OUTPUT since going through a makefile would break
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the makefile when it interprets the '#' as the beginning of a comment.
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You'd have something like this:
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FOO = "#include <locale.h>"
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If you end up in a situation where you need to refer to both these
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makefile-hostile variables and non-makefile hostile variables in the
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same file, please restructure things (breaking the file up if
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necessary) so that only the makefile hostile variables are in the
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files being handled by AC_OUTPUT directly.
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===========================================================================
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It is not safe to use $prefix in configure.in for anything other than
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an unexpanded reference. If the user doesn't specify a --prefix, then
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it'll be set to NONE until the end of the configure process.
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===========================================================================
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