1dnl Copyright (C) 2012-2018 Free Software Foundation, Inc.
2dnl This file is free software; the Free Software Foundation
3dnl gives unlimited permission to copy and/or distribute it,
4dnl with or without modifications, as long as this notice is preserved.
5
6dnl gl_NON_RECURSIVE_GNULIB_PREFIX_HACK LIB_DIR
7dnl Adjust configure-set $gl_LIBOBJS and each AC_SUBST'd *_H variable
8dnl with a value ending in ".h" to reflect that these files are located
9dnl in the directory specified by LIB_DIR.
10AC_DEFUN([gl_NON_RECURSIVE_GNULIB_PREFIX_HACK],
11[
12  # Tell AC_LIBSOURCES where to find source files like alloca.c.
13  AC_CONFIG_LIBOBJ_DIR([$1])
14
15  # This hack originated in bison.  It is required when using non-recursive
16  # automake rules to build from gnulib-provided lib/ sources.  Hence, LIB_DIR
17  # is usually simply "lib".  Those rules use the list of names like "fchdir.o"
18  # and "strstr.o" in gl_LIBOBJS.  With non-recursive make, we must prefix each
19  # such file name with the "lib/" prefix.  See also build-aux/prefix-gnulib-mk.
20  gl_LIBOBJS=`echo "$gl_LIBOBJS" | sed -e 's, , $1/,g'`
21
22  # Listing the names of the variables to prefix is error-prone.
23  # Rather, adjust each AC_SUBST'd variable whose name ends in '_H'
24  # and whose value ends in '.h'.
25  for ac_var in $ac_subst_vars
26  do
27    eval "ac_val=\$$ac_var"
28    case $ac_var:$ac_val in
29      *_H:*.h) eval "$ac_var=$1/\$$ac_var";;
30    esac
31  done
32])
33