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Re: trying to get AC_PATH_PROG into config.h... - follow up question
From: |
Akim Demaille |
Subject: |
Re: trying to get AC_PATH_PROG into config.h... - follow up question |
Date: |
25 Apr 2002 12:13:31 +0200 |
User-agent: |
Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Common Lisp) |
>>>>> "Mario" == Mario Schubert <address@hidden> writes:
Mario> I write AC_DEFINE_UNQUOTED(datadir, "$datadir", [path to data])
Mario> in configure.in and get /* path to data */ #define datadir
Mario> "${prefix}/share" in config.h. How do I get the complete path?
Read the doc.
Installation Directory Variables
--------------------------------
The following variables specify the directories where the package
will be installed, see *Note Variables for Installation Directories:
(standards)Directory Variables, for more information. See the end of
this section for details on when and how to use these variables.
- Variable: bindir
The directory for installing executables that users run.
- Variable: datadir
The directory for installing read-only architecture-independent
data.
- Variable: exec_prefix
The installation prefix for architecture-dependent files. By
default it's the same as PREFIX. You should avoid installing
anything directly to EXEC_PREFIX. However, the default value for
directories containing architecture-dependent files should be
relative to EXEC_PREFIX.
- Variable: includedir
The directory for installing C header files.
- Variable: infodir
The directory for installing documentation in Info format.
- Variable: libdir
The directory for installing object code libraries.
- Variable: libexecdir
The directory for installing executables that other programs run.
- Variable: localstatedir
The directory for installing modifiable single-machine data.
- Variable: mandir
The top-level directory for installing documentation in man format.
- Variable: oldincludedir
The directory for installing C header files for non-gcc compilers.
- Variable: prefix
The common installation prefix for all files. If EXEC_PREFIX is
defined to a different value, PREFIX is used only for
architecture-independent files.
- Variable: sbindir
The directory for installing executables that system
administrators run.
- Variable: sharedstatedir
The directory for installing modifiable architecture-independent
data.
- Variable: sysconfdir
The directory for installing read-only single-machine data.
Most of these variables have values that rely on `prefix' or
`exec_prefix'. It is deliberate that the directory output variables
keep them unexpanded: typically address@hidden@' will be replaced by
`${prefix}/share', not `/usr/local/share'.
This behavior is mandated by the GNU coding standards, so that when
the user runs:
`make'
she can still specify a different prefix from the one specified to
`configure', in which case, if needed, the package shall hard code
dependencies corresponding to the make-specified prefix.
`make install'
she can specify a different installation location, in which case
the package _must_ still depend on the location which was compiled
in (i.e., never recompile when `make install' is run). This is an
extremely important feature, as many people may decide to install
all the files of a package grouped together, and then install
links from the final locations to there.
In order to support these features, it is essential that `datadir'
remains being defined as `${prefix}/share' to depend upon the current
value of `prefix'.
A corollary is that you should not use these variables except in
Makefiles. For instance, instead of trying to evaluate `datadir' in
`configure' and hardcoding it in Makefiles using e.g.
`AC_DEFINE_UNQUOTED(DATADIR, "$datadir")', you should add
`-DDATADIR="$(datadir)"' to your `CPPFLAGS'.
Similarly you should not rely on `AC_OUTPUT_FILES' to replace
`datadir' and friends in your shell scripts and other files, rather let
`make' manage their replacement. For instance Autoconf ships templates
of its shell scripts ending with `.sh', and uses this Makefile snippet:
.sh:
rm -f $@ address@hidden
sed 's,@datadir\@,$(pkgdatadir),g' $< >address@hidden
chmod +x address@hidden
mv address@hidden $@
Three things are noteworthy:
address@hidden@'
The backslash prevents `configure' from replacing address@hidden@' in
the sed expression itself.
`$(pkgdatadir)'
Don't use address@hidden@'! Use the matching makefile variable
instead.
`,'
Don't use `/' in the sed expression(s) since most probably the
variables you use, such as `$(pkgdatadir)', will contain some.
--
Ashamed.