/usr/bin/fftw-wisdom-to-conf is in libfftw3-bin 3.3.7-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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if test "x$1" = "x--help" || test "x$1" = "x-h"; then
cat <<EOF
Usage: fftw-wisdom-to-conf [OPTIONS] [< INPUT] [> OUTPUT]
Convert wisdom (stdin) to C configuration routine (stdout).
Options:
-h, --help: print this help
-V, --version: print version/copyright info
EOF
exit 0
fi
if test "x$1" = "x--version" || test "x$1" = "x-V"; then
cat <<EOF
fftw-wisdom-to-conf from FFTW version 3.3.7
Copyright (c) 2003, 2007-14 Matteo Frigo
Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
EOF
exit 0
fi
read preamble fftw_wisdom
case "$preamble $fftw_wisdom" in
\(fftw-3.3.7\ *_wisdom*)
prefix=`echo $fftw_wisdom | cut -d_ -f1`_
;;
*)
echo "fftw-wisdom-to-conf: invalid wisdom" 1>&2
exit 1
;;
esac
cat <<EOF
/* Automatically generated by fftw-wisdom-to-conf from fftw 3.3.7.
DO NOT EDIT! (Unless you really, really want to. Then it's okay.) */
void ${prefix}configure_planner(void *plnr)
{
struct solvtab_s { void (*reg)(void *); const char *reg_nam; };
extern void ${prefix}solvtab_exec(const struct solvtab_s s[], void *);
#define DECLARE(name) extern void name(void *);
#define STRINGIZEx(x) #x
#define STRINGIZE(x) STRINGIZEx(x)
#define SOLVTAB(s) { s, STRINGIZE(s) },
#define DO(X) \\
EOF
sed 's/ *(//' | cut -d" " -f1 | grep -v -- - | egrep -v '^ *\)*$' | sort | uniq | while read reg_nam; do
printf ' X(%s)\\\n' "$reg_nam"
done
cat <<EOF
/* end DO(X) */
DO(DECLARE)
const struct solvtab_s s[] = {
DO(SOLVTAB)
{ 0, 0 }
};
${prefix}solvtab_exec(s, plnr);
}
EOF
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