#!/usr/bin/env python

from itertools import combinations
from os import uname
from multiprocessing import cpu_count

nparallel = cpu_count() * 2

uname = uname()[0]

def powerset(items):
    result = []
    for i in xrange(len(items) + 1):
        result += combinations(items, i)
    return result

possible_compilers = [('gcc', 'g++'), ('clang', 'clang++')]
possible_compiler_opts = [
    '-m32',
]
possible_config_opts = [
    '--enable-debug',
    '--enable-prof',
    '--disable-stats',
    '--with-malloc-conf=tcache:false',
]
possible_malloc_conf_opts = [
    'tcache:false',
    'dss:primary',
    'percpu_arena:percpu',
    'background_thread:true',
]

print 'set -e'
print 'if [ -f Makefile ] ; then make relclean ; fi'
print 'autoconf'
print 'rm -rf run_tests.out'
print 'mkdir run_tests.out'
print 'cd run_tests.out'

ind = 0
for cc, cxx in possible_compilers:
    for compiler_opts in powerset(possible_compiler_opts):
        for config_opts in powerset(possible_config_opts):
            for malloc_conf_opts in powerset(possible_malloc_conf_opts):
                if cc is 'clang' \
                  and '-m32' in possible_compiler_opts \
                  and '--enable-prof' in config_opts:
                    continue
                config_line = (
                    'EXTRA_CFLAGS=-Werror EXTRA_CXXFLAGS=-Werror '
                    + 'CC="{} {}" '.format(cc, " ".join(compiler_opts))
                    + 'CXX="{} {}" '.format(cxx, " ".join(compiler_opts))
                    + '../../configure '
                    + " ".join(config_opts) + (' --with-malloc-conf=' +
                    ",".join(malloc_conf_opts) if len(malloc_conf_opts) > 0
                    else '')
                )

                # Per CPU arenas are only supported on Linux.
                linux_supported = ('percpu_arena:percpu' in malloc_conf_opts \
                  or 'background_thread:true' in malloc_conf_opts)
                # Heap profiling and dss are not supported on OS X.
                darwin_unsupported = ('--enable-prof' in config_opts or \
                  'dss:primary' in malloc_conf_opts)
                if (uname == 'Linux' and linux_supported) \
                  or (not linux_supported and (uname != 'Darwin' or \
                  not darwin_unsupported)):
                    print """cat <<EOF > run_test_%(ind)d.sh
#!/bin/sh

set -e

abort() {
    echo "==> Error" >> run_test.log
    echo "Error; see run_tests.out/run_test_%(ind)d.out/run_test.log"
    exit 255 # Special exit code tells xargs to terminate.
}

# Environment variables are not supported.
run_cmd() {
    echo "==> \$@" >> run_test.log
    \$@ >> run_test.log 2>&1 || abort
}

echo "=> run_test_%(ind)d: %(config_line)s"
mkdir run_test_%(ind)d.out
cd run_test_%(ind)d.out

echo "==> %(config_line)s" >> run_test.log
%(config_line)s >> run_test.log 2>&1 || abort

run_cmd make all tests
run_cmd make check
run_cmd make distclean
EOF
chmod 755 run_test_%(ind)d.sh""" % {'ind': ind, 'config_line': config_line}
                    ind += 1

print 'for i in `seq 0 %(last_ind)d` ; do echo run_test_${i}.sh ; done | xargs -P %(nparallel)d -n 1 sh' % {'last_ind': ind-1, 'nparallel': nparallel}