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New config files output variable `top_build_prefix'.

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* lib/autoconf/status.m4 (_AC_OUTPUT_FILE): Substitute
`top_build_prefix'.
* doc/autoconf.texi (Preset Output Variables): Document it.
* NEWS: Update.
Report by Bob Friesenhahn.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
This commit is contained in:
Ralf Wildenhues 2007-11-09 07:51:19 +01:00
parent 83bd220b0c
commit feef9e7e7e
4 changed files with 20 additions and 0 deletions
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7
ChangeLog
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@ -1,5 +1,12 @@
2007-11-09 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
New config files output variable `top_build_prefix'.
* lib/autoconf/status.m4 (_AC_OUTPUT_FILE): Substitute
`top_build_prefix'.
* doc/autoconf.texi (Preset Output Variables): Document it.
* NEWS: Update.
Report by Bob Friesenhahn.
Avoid expr for arithmetic evaluation if the shell accepts $((...)).
* lib/autotest/general.m4 (AT_INIT) <at_func_arith>: New
function, to parametrize arithmetic with expr vs. the shell.

2
NEWS
View File

@ -13,6 +13,8 @@ GNU Autoconf NEWS - User visible changes.
Further, for config headers, the total size of values is not limited by
the POSIX length limit of text lines any more, only each single line.
** New config variable `top_build_prefix'.
** Autoconf is now licensed under the General Public License version 3
or later (GPLv3+). As with earlier versions, the license includes
an exception clause so that you may release a configure script

10
doc/autoconf.texi
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@ -2436,6 +2436,16 @@ The relative name of the top level of the current build tree. In the
top-level directory, this is the same as @code{builddir}.
@end defvar
@defvar top_build_prefix
@ovindex top_build_prefix
The relative name of the top level of the current build tree with final
slash if nonemtpy. This is the same as @code{top_builddir}, except that
it contains of zero of more runs of @code{../}, so it should not be
appended with a slash for concatenation. This helps for @command{make}
implementations that otherwise do not treat @file{./file} and @file{file}
as equal in the toplevel build directory.
@end defvar
@defvar abs_top_builddir
@ovindex abs_top_builddir
Absolute name of @code{top_builddir}.

1
lib/autoconf/status.m4
View File

@ -622,6 +622,7 @@ dnl configure_input is a somewhat special, so we don't call AC_SUBST_TRACE.
s&@configure_input@&$configure_input&;t t
dnl During the transition period, this is a special case:
s&@top_builddir@&$ac_top_builddir_sub&;t t[]AC_SUBST_TRACE([top_builddir])
s&@top_build_prefix@&$ac_top_build_prefix&;t t[]AC_SUBST_TRACE([top_build_prefix])
m4_foreach([_AC_Var], [srcdir, abs_srcdir, top_srcdir, abs_top_srcdir,
builddir, abs_builddir,
abs_top_builddir]AC_PROVIDE_IFELSE([AC_PROG_INSTALL], [[, INSTALL]])AC_PROVIDE_IFELSE([AC_PROG_MKDIR_P], [[, MKDIR_P]]),