How to install a lua module in a subdirectory of libdir with the autotools - lua

Question

I have written a little lua module that I complile using the autotools and I want to modify its organization:
Now I have this in the main directory:
autogen.sh
configure.ac
Makefile.am
src
file1.c
file2.c
file3.c
the autogen.sh
#!/bin/sh
echo "Running aclocal..." ; aclocal $ACLOCAL_FLAGS || exit 1
echo "Running libtoolize..."; libtoolize --copy --automake || exit 1;
echo "Running autoheader..." ; autoheader || exit 1
echo "Running autoconf..." ; autoconf || exit 1
echo "Running automake..." ; automake --add-missing --copy --gnu || exit 1
./configure "$#"
The configure.ac
# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
AC_PREREQ([2.69])
AC_INIT([lua-clangc], [0.0.1], [cedlemo#gmx.com])
AC_CONFIG_SRCDIR([configure.ac])
AC_CONFIG_HEADERS([config.h])
# Checks for programs.
AC_PROG_CC(clang gcc)
# Checks for libraries.
PKG_CHECK_MODULES([DEPS], [lua])
#LUA_VERSION = $(pkg-config --version)
#AC_SUBST([LUA_VERSION])
# Checks for header files.
AC_CHECK_HEADERS([string.h stdlib.h clang-c/Index.h])
# Checks for typedefs, structures, and compiler characteristics.
# Checks for library functions.
AM_INIT_AUTOMAKE(1.13 dist-bzip2 foreign subdir-objects)
LT_PREREQ(2.4)
LT_INIT
AC_CONFIG_FILES([
Makefile
])
AC_OUTPUT
and the Makefile.am
MAINTAINERCLEANFILES = \
Makefile.in aclocal.m4 config.h.in configure \
depcomp install-sh missing compile config.sub \
config.guess ltmain.sh compile
lib_LTLIBRARIES = src/clangc.la
src_clangc_la_SOURCES = src/clangc.c src/indexlib.c src/translationunitlib.c src/constants.c src/clangc_module_functions.c
src_clangc_la_LDFLAGS = -module -avoid-version -shared -llua -lm -lclang -fPIC
I use this commands to compile and install the lua module:
./autogen.sh --libdir=/usr/lib/lua/5.3
make
sudo make install
My files are installed in /usr/lib/lua/5.3
/usr/lib/lua/5.3/clangc.so
/usr/lib/lua/5.3/clangc.la
I would like to just use
./autogen.sh --prefix=/usr
And that the configure.ac script build libdir like this:
libdir=prefix + /lib/lua/ + LUA_VERSION + /clangc/
(I have already a way to get the LUA_VERSION in the configure.ac)

Answer 1

As always I answer to myself:
I just have to modify my configure.ac like this:
AC_PREREQ([2.69])
AC_INIT([lua-clangc], [0.0.1], [cedlemo#gmx.com])
AC_CONFIG_SRCDIR([configure.ac])
AC_CONFIG_HEADERS([config.h])
# Checks for programs.
AC_PROG_CC(clang gcc)
# Checks for libraries.
PKG_CHECK_MODULES([DEPS], [lua])
LUA_VERSION=$(pkg-config --modversion lua | awk -F "." '{print $1"."$2}')
AC_SUBST([LUA_VERSION])
libdir=$prefix/lib/lua/$LUA_VERSION/clangc
# Checks for header files.
AC_CHECK_HEADERS([string.h stdlib.h clang-c/Index.h])
# Checks for typedefs, structures, and compiler characteristics.
# Checks for library functions.
AM_INIT_AUTOMAKE(1.13 dist-bzip2 foreign subdir-objects)
LT_PREREQ(2.4)
LT_INIT
AC_CONFIG_FILES([
Makefile
])
AC_OUTPUT
First I had to find the current lua version:
LUA_VERSION=$(pkg-config --modversion lua | awk -F "." '{print $1"."$2}')
On my system:
pkg-config --modversion lua returns 5.3.1
awk -F "." '{print $1"."$2}' returns 5.3
Then the line:
libdir=$prefix/lib/lua/$LUA_VERSION/clangc
Do all the magic.
When I use:
./autogen.sh --prefix=/usr
My lib is installed in:
/usr/lib/lua/5.3/clangc