meson/environment.py

    #!/usr/bin/python3 -tt

# Copyright 2012 Jussi Pakkanen

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import subprocess, os.path, platform
import coredata
from glob import glob
import tempfile

build_filename = 'meson.build'

class EnvironmentException(Exception):
    def __init(self, *args, **kwargs):
        Exception.__init__(self, *args, **kwargs)

class CCompiler():
    def __init__(self, exelist):
        if type(exelist) == type(''):
            self.exelist = [exelist]
        elif type(exelist) == type([]):
            self.exelist = exelist
        else:
            raise TypeError('Unknown argument to CCompiler')
        self.language = 'c'
        self.default_suffix = 'c'
        self.id = 'unknown'
    
    def get_id(self):
        return self.id

    def get_dependency_gen_flags(self, outtarget, outfile):
        return ['-MMD', '-MT', outtarget, '-MF', outfile]

    def get_depfile_suffix(self):
        return 'd'

    def get_language(self):
        return self.language

    def get_exelist(self):
        return self.exelist[:]
    
    def get_linker_exelist(self):
        return self.exelist[:]

    def get_compile_only_flags(self):
        return ['-c']

    def get_output_flags(self, target):
        return ['-o', target]
    
    def get_linker_output_flags(self, outputname):
        return ['-o', outputname]

    def get_debug_flags(self):
        return ['-g']

    def get_coverage_flags(self):
        return ['--coverage']

    def get_coverage_link_flags(self):
        return ['-lgcov']

    def get_std_exe_link_flags(self):
        return []

    def get_include_arg(self, path):
        return '-I' + path

    def get_std_shared_lib_link_flags(self):
        return ['-shared']

    def can_compile(self, filename):
        suffix = filename.split('.')[-1]
        if suffix == 'c' or suffix == 'h':
            return True
        return False

    def get_pic_flags(self):
        return ['-fPIC']

    def name_string(self):
        return ' '.join(self.exelist)
    
    def sanity_check(self, work_dir):
        source_name = os.path.join(work_dir, 'sanitycheckc.c')
        binary_name = os.path.join(work_dir, 'sanitycheckc')
        ofile = open(source_name, 'w')
        ofile.write('int main(int argc, char **argv) { int class=0; return class; }\n')
        ofile.close()
        pc = subprocess.Popen(self.exelist + [source_name, '-o', binary_name])
        pc.wait()
        if pc.returncode != 0:
            raise EnvironmentException('Compiler %s can not compile programs.' % self.name_string())
        pe = subprocess.Popen(binary_name)
        pe.wait()
        if pe.returncode != 0:
            raise EnvironmentException('Executables created by C compiler %s are not runnable.' % self.name_string())
    
    def compiles(self, code):
        suflen = len(self.default_suffix)
        (fd, srcname) = tempfile.mkstemp(suffix='.'+self.default_suffix)
        os.close(fd)
        ofile = open(srcname, 'w')
        ofile.write(code)
        ofile.close()
        commands = self.get_exelist()
        commands += self.get_compile_only_flags()
        commands.append(srcname)
        p = subprocess.Popen(commands, cwd=os.path.split(srcname)[0], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        p.communicate()
        os.remove(srcname)
        try:
            trial = srcname[:-suflen] + 'o'
            os.remove(trial)
        except FileNotFoundError:
            pass
        try:
            os.remove(srcname[:-suflen] + 'obj')
        except FileNotFoundError:
            pass
        return p.returncode == 0

    def sizeof(self, element, prefix):
        templ = '''#include<stdio.h>
%s

int main(int argc, char **argv) {
    printf("%%ld\\n", (long)(sizeof(%s)));
    return 0;
};
'''
        (fd, srcname) = tempfile.mkstemp(suffix='.'+self.default_suffix)
        exename = srcname + '.exe' # Is guaranteed to be executable on every platform.
        os.close(fd)
        ofile = open(srcname, 'w')
        code = templ % (prefix, element)
        ofile.write(code)
        ofile.close()
        commands = self.get_exelist()
        commands.append(srcname)
        commands += self.get_output_flags(exename)
        p = subprocess.Popen(commands, cwd=os.path.split(srcname)[0], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        p.communicate()
        os.remove(srcname)
        if p.returncode != 0:
            raise EnvironmentException('Could not compile sizeof test.')
        pe = subprocess.Popen(exename, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        so = pe.communicate()[0]
        os.remove(exename)
        if pe.returncode != 0:
            raise EnvironmentException('Could not run sizeof test binary.')
        return int(so.decode())

cxx_suffixes = ['cc', 'cpp', 'cxx', 'hh', 'hpp', 'hxx']

class CXXCompiler(CCompiler):
    def __init__(self, exelist):
        CCompiler.__init__(self, exelist)
        self.language = 'cxx'
        self.default_suffix = 'cpp'

    def can_compile(self, filename):
        suffix = filename.split('.')[-1]
        if suffix in cxx_suffixes:
            return True
        return False

    def sanity_check(self, work_dir):
        source_name = os.path.join(work_dir, 'sanitycheckcxx.cc')
        binary_name = os.path.join(work_dir, 'sanitycheckcxx')
        ofile = open(source_name, 'w')
        ofile.write('class breakCCompiler;int main(int argc, char **argv) { return 0; }\n')
        ofile.close()
        pc = subprocess.Popen(self.exelist + [source_name, '-o', binary_name])
        pc.wait()
        if pc.returncode != 0:
            raise EnvironmentException('Compiler %s can not compile programs.' % self.name_string())
        pe = subprocess.Popen(binary_name)
        pe.wait()
        if pe.returncode != 0:
            raise EnvironmentException('Executables created by C++ compiler %s are not runnable.' % self.name_string())

class ObjCCompiler(CCompiler):
    def __init__(self, exelist):
        CCompiler.__init__(self, exelist)
        self.language = 'objc'
        self.default_suffix = 'm'
        
    def can_compile(self, filename):
        suffix = filename.split('.')[-1]
        if suffix == 'm' or suffix == 'h':
            return True
        return False

class ObjCXXCompiler(CXXCompiler):
    def __init__(self, exelist):
        CXXCompiler.__init__(self, exelist)
        self.language = 'objcxx'
        self.default_suffix = 'mm'

    def can_compile(self, filename):
        suffix = filename.split('.')[-1]
        if suffix == 'mm' or suffix == 'h':
            return True
        return False

    def sanity_check(self, work_dir):
        source_name = os.path.join(work_dir, 'sanitycheckobjcxx.mm')
        binary_name = os.path.join(work_dir, 'sanitycheckobjcxx')
        ofile = open(source_name, 'w')
        ofile.write('#import<stdio.h>\nclass MyClass;int main(int argc, char **argv) { return 0; }\n')
        ofile.close()
        pc = subprocess.Popen(self.exelist + [source_name, '-o', binary_name])
        pc.wait()
        if pc.returncode != 0:
            raise EnvironmentException('ObjC++ compiler %s can not compile programs.' % self.name_string())
        pe = subprocess.Popen(binary_name)
        pe.wait()
        if pe.returncode != 0:
            raise EnvironmentException('Executables created by ObjC++ compiler %s are not runnable.' % self.name_string())

class VisualStudioCCompiler(CCompiler):
    std_warn_flags = ['/W3']
    std_opt_flags= ['/O2']
    
    def __init__(self, exelist):
        CCompiler.__init__(self, exelist)
        self.id = 'msvc'

    def get_std_warn_flags(self):
        return VisualStudioCCompiler.std_warn_flags

    def get_std_opt_flags(self):
        return VisualStudioCCompiler.std_opt_flags
    
    def get_pch_suffix(self):
        return 'pch'

    def get_debug_flags(self):
        return ['/D_DEBUG', '/Zi', '/MDd', '/Ob0', '/RTC1']

    def get_compile_only_flags(self):
        return ['/c']

    def get_output_flags(self, target):
        return ['/Fo' + target]

    def get_dependency_gen_flags(self, outtarget, outfile):
        return []

    def get_linker_exelist(self):
        return ['link'] # FIXME, should have same path as compiler.

    def get_linker_output_flags(self, outputname):
        return ['/OUT:' + outputname]

    def get_pic_flags(self):
        return []

    def get_std_shared_lib_link_flags(self):
        return []

    def sanity_check(self, work_dir):
        source_name = os.path.join(work_dir, 'sanitycheckc.c')
        binary_name = os.path.join(work_dir, 'sanitycheckc')
        ofile = open(source_name, 'w')
        ofile.write('int main(int argc, char **argv) { return 0; }\n')
        ofile.close()
        pc = subprocess.Popen(self.exelist + [source_name, '/Fe' + binary_name],
                              stdout=subprocess.DEVNULL,
                              stderr=subprocess.DEVNULL)
        pc.wait()
        if pc.returncode != 0:
            raise EnvironmentException('Compiler %s can not compile programs.' % self.name_string())
        pe = subprocess.Popen(binary_name)
        pe.wait()
        if pe.returncode != 0:
            raise EnvironmentException('Executables created by C++ compiler %s are not runnable.' % self.name_string())

class VisualStudioCXXCompiler(VisualStudioCCompiler):
    def __init__(self, exelist):
        VisualStudioCCompiler.__init__(self, exelist)
        self.language = 'cxx'
        self.default_suffix = 'cpp'

    def can_compile(self, filename):
        suffix = filename.split('.')[-1]
        if suffix in cxx_suffixes:
            return True
        return False

    def sanity_check(self, work_dir):
        source_name = os.path.join(work_dir, 'sanitycheckcxx.cpp')
        binary_name = os.path.join(work_dir, 'sanitycheckcxx')
        ofile = open(source_name, 'w')
        ofile.write('class BreakPlainC;int main(int argc, char **argv) { return 0; }\n')
        ofile.close()
        pc = subprocess.Popen(self.exelist + [source_name, '/Fe' + binary_name],
                              stdout=subprocess.DEVNULL,
                              stderr=subprocess.DEVNULL)
        pc.wait()
        if pc.returncode != 0:
            raise EnvironmentException('Compiler %s can not compile programs.' % self.name_string())
        pe = subprocess.Popen(binary_name)
        pe.wait()
        if pe.returncode != 0:
            raise EnvironmentException('Executables created by C++ compiler %s are not runnable.' % self.name_string())

class GnuCCompiler(CCompiler):
    std_warn_flags = ['-Wall', '-Winvalid-pch']
    std_opt_flags = ['-O2']

    def __init__(self, exelist):
        CCompiler.__init__(self, exelist)
        self.id = 'gcc'

    def get_std_warn_flags(self):
        return GnuCCompiler.std_warn_flags

    def get_std_opt_flags(self):
        return GnuCCompiler.std_opt_flags

    def get_pch_suffix(self):
        return 'gch'

class GnuObjCCompiler(ObjCCompiler):
    std_warn_flags = ['-Wall', '-Winvalid-pch']
    std_opt_flags = ['-O2']
    
    def __init__(self, exelist):
        ObjCCompiler.__init__(self, exelist)
        self.id = 'gcc'

    def get_std_warn_flags(self):
        return GnuObjCCompiler.std_warn_flags

    def get_std_opt_flags(self):
        return GnuObjCCompiler.std_opt_flags

    def get_pch_suffix(self):
        return 'gch'

class GnuObjCXXCompiler(ObjCXXCompiler):
    std_warn_flags = ['-Wall', '-Winvalid-pch']
    std_opt_flags = ['-O2']

    def __init__(self, exelist):
        ObjCCompiler.__init__(self, exelist)
        self.id = 'gcc'

    def get_std_warn_flags(self):
        return GnuObjCXXCompiler.std_warn_flags

    def get_std_opt_flags(self):
        return GnuObjCXXCompiler.std_opt_flags

    def get_pch_suffix(self):
        return 'gch'

class ClangCCompiler(CCompiler):
    std_warn_flags = ['-Wall', '-Winvalid-pch']
    std_opt_flags = ['-O2']

    def __init__(self, exelist):
        CCompiler.__init__(self, exelist)
        self.id = 'clang'

    def get_std_warn_flags(self):
        return ClangCCompiler.std_warn_flags

    def get_std_opt_flags(self):
        return ClangCCompiler.std_opt_flags

    def get_pch_suffix(self):
        return 'pch'

class GnuCXXCompiler(CXXCompiler):
    std_warn_flags = ['-Wall', '-Winvalid-pch']
    std_opt_flags = ['-O2']
    
    def __init__(self, exelist):
        CXXCompiler.__init__(self, exelist)
        self.id = 'gcc'

    def get_std_warn_flags(self):
        return GnuCXXCompiler.std_warn_flags

    def get_std_opt_flags(self):
        return GnuCXXCompiler.std_opt_flags

    def get_pch_suffix(self):
        return 'gch'

class ClangCXXCompiler(CXXCompiler):
    std_warn_flags = ['-Wall', '-Winvalid-pch']
    std_opt_flags = ['-O2']

    def __init__(self, exelist):
        CXXCompiler.__init__(self, exelist)
        self.id = 'clang'

    def get_std_warn_flags(self):
        return ClangCXXCompiler.std_warn_flags

    def get_std_opt_flags(self):
        return ClangCXXCompiler.std_opt_flags

    def get_pch_suffix(self):
        return 'pch'

class VisualStudioLinker():
    def __init__(self, exelist):
        self.exelist = exelist
        
    def get_exelist(self):
        return self.exelist

    def get_std_link_flags(self):
        return []

    def get_output_flags(self, target):
        return ['/OUT:' + target]

    def get_coverage_link_flags(self):
        return []

class ArLinker():
    std_flags = ['csr']

    def __init__(self, exelist):
        self.exelist = exelist
        
    def get_exelist(self):
        return self.exelist
    
    def get_std_link_flags(self):
        return self.std_flags

    def get_output_flags(self, target):
        return [target]

    def get_coverage_link_flags(self):
        return []

def exe_exists(arglist):
    try:
        p = subprocess.Popen(arglist, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        p.communicate()
        if p.returncode == 0:
            return True
    except FileNotFoundError:
        pass
    return False

def find_coverage_tools():
    gcovr_exe = 'gcovr'
    lcov_exe = 'lcov'
    genhtml_exe = 'genhtml'
    
    if not exe_exists([gcovr_exe, '--version']):
        gcovr_exe = None
    if not exe_exists([lcov_exe, '--version']):
        lcov_exe = None
    if not exe_exists([genhtml_exe, '--version']):
        genhtml_exe = None
    return (gcovr_exe, lcov_exe, genhtml_exe)

def find_valgrind():
    valgrind_exe = 'valgrind'
    if not exe_exists([valgrind_exe, '--version']):
        valgrind_exe = None
    return valgrind_exe

def find_cppcheck():
    cppcheck_exe = 'cppcheck'
    if not exe_exists([cppcheck_exe, '-h']):
        cppcheck_exe = None
    return cppcheck_exe

def is_osx():
    return platform.system().lower() == 'darwin'

def is_windows():
    return platform.system().lower() == 'windows'

header_suffixes = ['h', 'hh', 'hpp', 'hxx', 'H']

class Environment():
    private_dir = 'meson-private'
    log_dir = 'meson-logs'
    coredata_file = os.path.join(private_dir, 'coredata.dat')

    def __init__(self, source_dir, build_dir, main_script_file, options):
        assert(os.path.isabs(main_script_file))
        assert(not os.path.islink(main_script_file))
        self.source_dir = source_dir
        self.build_dir = build_dir
        self.meson_script_file = main_script_file
        self.scratch_dir = os.path.join(build_dir, Environment.private_dir)
        self.log_dir = os.path.join(build_dir, Environment.log_dir)
        os.makedirs(self.scratch_dir, exist_ok=True)
        os.makedirs(self.log_dir, exist_ok=True)
        try:
            cdf = os.path.join(self.get_build_dir(), Environment.coredata_file)
            self.coredata = coredata.load(cdf)
        except IOError:
            self.coredata = coredata.CoreData(options)
        
        # List of potential compilers.
        if is_windows():
            self.default_c = ['cl', 'cc']
            self.default_cxx = ['cl', 'c++']
        else:
            self.default_c = ['cc']
            self.default_cxx = ['c++']
        self.default_objc = ['cc']
        self.default_objcxx = ['c++']
        self.default_static_linker = 'ar'
        self.vs_static_linker = 'lib'

        if is_windows():
            self.exe_suffix = 'exe'
            self.shared_lib_suffix = 'dll'
            self.shared_lib_prefix = ''
            self.static_lib_suffix = 'lib'
            self.static_lib_prefix = ''
            self.object_suffix = 'obj'
        else:
            self.exe_suffix = ''
            if is_osx():
                self.shared_lib_suffix = 'dylib'
            else:
                self.shared_lib_suffix = 'so'
            self.shared_lib_prefix = 'lib'
            self.static_lib_suffix = 'a'
            self.static_lib_prefix = 'lib'
            self.object_suffix = 'o'

    def generating_finished(self):
        cdf = os.path.join(self.get_build_dir(), Environment.coredata_file)
        coredata.save(self.coredata, cdf)

    def get_script_dir(self):
        return os.path.dirname(self.meson_script_file)
    
    def get_log_dir(self):
        return self.log_dir

    def get_coredata(self):
        return self.coredata

    def get_build_command(self):
        return self.meson_script_file

    def is_header(self, fname):
        suffix = fname.split('.')[-1]
        return suffix in header_suffixes

    def detect_c_compiler(self):
        evar = 'CC'
        if evar in os.environ:
            compilers = os.environ[evar].split()
            ccache = []
        else:
            compilers = self.default_c
            ccache = self.detect_ccache()
        for compiler in compilers:
            try:
                basename = os.path.basename(compiler).lower() 
                if basename == 'cl' or basename == 'cl.exe':
                    arg = '/?'
                else:
                    arg = '--version'
                p = subprocess.Popen([compiler] + [arg], stdout=subprocess.PIPE,
                                     stderr=subprocess.DEVNULL)
            except OSError:
                continue
            out = p.communicate()[0]
            out = out.decode()
            if (out.startswith('cc ') or out.startswith('gcc')) and \
                'Free Software Foundation' in out:
                return GnuCCompiler(ccache + [compiler])
            if 'apple' in out and 'Free Software Foundation' in out:
                return GnuCCompiler(ccache + [compiler])
            if (out.startswith('clang')):
                return ClangCCompiler(ccache + [compiler])
            if 'Microsoft' in out:
                return VisualStudioCCompiler([compiler])
        raise EnvironmentException('Unknown compiler(s): "' + ', '.join(compilers) + '"')

    def get_scratch_dir(self):
        return self.scratch_dir

    def get_depfixer(self):
        path = os.path.split(__file__)[0]
        return os.path.join(path, 'depfixer.py')

    def detect_cxx_compiler(self):
        evar = 'CC'
        if evar in os.environ:
            compilers = os.environ[evar].split()
            ccache = []
        else:
            compilers = self.default_cxx
            ccache = self.detect_ccache()
        for compiler in compilers:
            basename = os.path.basename(compiler).lower() 
            if basename == 'cl' or basename == 'cl.exe':
                arg = '/?'
            else:
                arg = '--version'
            try:
                p = subprocess.Popen([compiler, arg],
                                     stdout=subprocess.PIPE,
                                     stderr=subprocess.DEVNULL)
            except OSError:
                continue
            out = p.communicate()[0]
            out = out.decode()
            if (out.startswith('c++ ') or out.startswith('g++')) and \
                'Free Software Foundation' in out:
                return GnuCXXCompiler(ccache + [compiler])
            if 'apple' in out and 'Free Software Foundation' in out:
                return GnuCXXCompiler(ccache + [compiler])
            if out.startswith('clang'):
                return ClangCXXCompiler(ccache + [compiler])
            if 'Microsoft' in out:
                return VisualStudioCXXCompiler([compiler])
        raise EnvironmentException('Unknown compiler(s) "' + ', '.join(compilers) + '"')

    def detect_objc_compiler(self):
        exelist = self.get_objc_compiler_exelist()
        try:
            p = subprocess.Popen(exelist + ['--version'], stdout=subprocess.PIPE)
        except OSError:
            raise EnvironmentException('Could not execute ObjC compiler "%s"' % ' '.join(exelist))
        out = p.communicate()[0]
        out = out.decode()
        if (out.startswith('cc ') or out.startswith('gcc')) and \
            'Free Software Foundation' in out:
            return GnuObjCCompiler(exelist)
        if 'apple' in out and 'Free Software Foundation' in out:
            return GnuObjCCompiler(exelist)
        raise EnvironmentException('Unknown compiler "' + ' '.join(exelist) + '"')

    def detect_objcxx_compiler(self):
        exelist = self.get_objcxx_compiler_exelist()
        try:
            p = subprocess.Popen(exelist + ['--version'], stdout=subprocess.PIPE)
        except OSError:
            raise EnvironmentException('Could not execute ObjC++ compiler "%s"' % ' '.join(exelist))
        out = p.communicate()[0]
        out = out.decode()
        if (out.startswith('c++ ') or out.startswith('g++')) and \
            'Free Software Foundation' in out:
            return GnuObjCXXCompiler(exelist)
        if 'apple' in out and 'Free Software Foundation' in out:
            return GnuObjCXXCompiler(exelist)
        raise EnvironmentException('Unknown compiler "' + ' '.join(exelist) + '"')

    def detect_static_linker(self, compiler):
        evar = 'AR'
        if evar in os.environ:
            linker = os.environ[evar].strip()
        if isinstance(compiler, VisualStudioCCompiler):
            linker= self.vs_static_linker
        else:
            linker = self.default_static_linker
        basename = os.path.basename(linker).lower()
        if basename == 'lib' or basename == 'lib.exe':
            arg = '/?'
        else:
            arg = '--version'
        try:
            p = subprocess.Popen([linker, arg], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        except OSError:
            raise EnvironmentException('Could not execute static linker "%s".' % linker)
        (out, err) = p.communicate()
        out = out.decode()
        err = err.decode()
        if '/OUT:' in out or '/OUT:' in err:
            return VisualStudioLinker([linker])
        if p.returncode == 0:
            return ArLinker([linker])
        if p.returncode == 1 and err.startswith('usage'): # OSX
            return ArLinker([linker])
        raise EnvironmentException('Unknown static linker "%s"' % linker)

    def detect_ccache(self):
        try:
            has_ccache = subprocess.call(['ccache', '--version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        except OSError:
            has_ccache = 1
        if has_ccache == 0:
            cmdlist = ['ccache']
        else:
            cmdlist = []
        return cmdlist

    def get_objc_compiler_exelist(self):
        ccachelist = self.detect_ccache()
        evar = 'OBJCC'
        if evar in os.environ:
            return os.environ[evar].split()
        return ccachelist + self.default_objc

    def get_objcxx_compiler_exelist(self):
        ccachelist = self.detect_ccache()
        evar = 'OBJCXX'
        if evar in os.environ:
            return os.environ[evar].split()
        return ccachelist + self.default_objcxx

    def get_source_dir(self):
        return self.source_dir
    
    def get_build_dir(self):
        return self.build_dir

    def get_exe_suffix(self):
        return self.exe_suffix

    def get_shared_lib_prefix(self):
        return self.shared_lib_prefix

    def get_shared_lib_suffix(self):
        return self.shared_lib_suffix

    def get_static_lib_prefix(self):
        return self.static_lib_prefix

    def get_static_lib_suffix(self):
        return self.static_lib_suffix

    def get_object_suffix(self):
        return self.object_suffix

    def get_prefix(self):
        return self.coredata.prefix

    def get_libdir(self):
        return self.coredata.libdir

    def get_bindir(self):
        return self.coredata.bindir

    def get_includedir(self):
        return self.coredata.includedir

    def get_mandir(self):
        return self.coredata.mandir

    def get_datadir(self):
        return self.coredata.datadir

    def find_library(self, libname):
        dirs = self.get_library_dirs()
        suffixes = [self.get_shared_lib_suffix(), self.get_static_lib_suffix()]
        prefix = self.get_shared_lib_prefix()
        for d in dirs:
            for suffix in suffixes:
                trial = os.path.join(d, prefix + libname + '.' + suffix)
                if os.path.isfile(trial):
                    return trial

    def get_library_dirs(self):
        if is_windows():
            return ['C:/mingw/lib'] # Fixme
        if is_osx():
            return ['/usr/lib'] # Fix me as well.
        unixdirs = ['/usr/lib', '/lib']
        plat = subprocess.check_output(['uname', '-m']).decode().strip()
        unixdirs += glob('/usr/lib/' + plat + '*')
        unixdirs.append('/usr/local/lib')
        return unixdirs