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+#! /usr/bin/env python
+# encoding: utf-8
+# DC 2008
+# Thomas Nagy 2016-2018 (ita)
+
+"""
+Fortran configuration helpers
+"""
+
+import re, os, sys, shlex
+from waflib.Configure import conf
+from waflib.TaskGen import feature, before_method
+
+FC_FRAGMENT = ' program main\n end program main\n'
+FC_FRAGMENT2 = ' PROGRAM MAIN\n END\n' # what's the actual difference between these?
+
+@conf
+def fc_flags(conf):
+ """
+ Defines common fortran configuration flags and file extensions
+ """
+ v = conf.env
+
+ v.FC_SRC_F = []
+ v.FC_TGT_F = ['-c', '-o']
+ v.FCINCPATH_ST = '-I%s'
+ v.FCDEFINES_ST = '-D%s'
+
+ if not v.LINK_FC:
+ v.LINK_FC = v.FC
+
+ v.FCLNK_SRC_F = []
+ v.FCLNK_TGT_F = ['-o']
+
+ v.FCFLAGS_fcshlib = ['-fpic']
+ v.LINKFLAGS_fcshlib = ['-shared']
+ v.fcshlib_PATTERN = 'lib%s.so'
+
+ v.fcstlib_PATTERN = 'lib%s.a'
+
+ v.FCLIB_ST = '-l%s'
+ v.FCLIBPATH_ST = '-L%s'
+ v.FCSTLIB_ST = '-l%s'
+ v.FCSTLIBPATH_ST = '-L%s'
+ v.FCSTLIB_MARKER = '-Wl,-Bstatic'
+ v.FCSHLIB_MARKER = '-Wl,-Bdynamic'
+
+ v.SONAME_ST = '-Wl,-h,%s'
+
+@conf
+def fc_add_flags(conf):
+ """
+ Adds FCFLAGS / LDFLAGS / LINKFLAGS from os.environ to conf.env
+ """
+ conf.add_os_flags('FCPPFLAGS', dup=False)
+ conf.add_os_flags('FCFLAGS', dup=False)
+ conf.add_os_flags('LINKFLAGS', dup=False)
+ conf.add_os_flags('LDFLAGS', dup=False)
+
+@conf
+def check_fortran(self, *k, **kw):
+ """
+ Compiles a Fortran program to ensure that the settings are correct
+ """
+ self.check_cc(
+ fragment = FC_FRAGMENT,
+ compile_filename = 'test.f',
+ features = 'fc fcprogram',
+ msg = 'Compiling a simple fortran app')
+
+@conf
+def check_fc(self, *k, **kw):
+ """
+ Same as :py:func:`waflib.Tools.c_config.check` but defaults to the *Fortran* programming language
+ (this overrides the C defaults in :py:func:`waflib.Tools.c_config.validate_c`)
+ """
+ kw['compiler'] = 'fc'
+ if not 'compile_mode' in kw:
+ kw['compile_mode'] = 'fc'
+ if not 'type' in kw:
+ kw['type'] = 'fcprogram'
+ if not 'compile_filename' in kw:
+ kw['compile_filename'] = 'test.f90'
+ if not 'code' in kw:
+ kw['code'] = FC_FRAGMENT
+ return self.check(*k, **kw)
+
+# ------------------------------------------------------------------------
+# --- These are the default platform modifiers, refactored here for
+# convenience. gfortran and g95 have much overlap.
+# ------------------------------------------------------------------------
+
+@conf
+def fortran_modifier_darwin(conf):
+ """
+ Defines Fortran flags and extensions for OSX systems
+ """
+ v = conf.env
+ v.FCFLAGS_fcshlib = ['-fPIC']
+ v.LINKFLAGS_fcshlib = ['-dynamiclib']
+ v.fcshlib_PATTERN = 'lib%s.dylib'
+ v.FRAMEWORKPATH_ST = '-F%s'
+ v.FRAMEWORK_ST = ['-framework']
+
+ v.LINKFLAGS_fcstlib = []
+
+ v.FCSHLIB_MARKER = ''
+ v.FCSTLIB_MARKER = ''
+ v.SONAME_ST = ''
+
+@conf
+def fortran_modifier_win32(conf):
+ """
+ Defines Fortran flags for Windows platforms
+ """
+ v = conf.env
+ v.fcprogram_PATTERN = v.fcprogram_test_PATTERN = '%s.exe'
+
+ v.fcshlib_PATTERN = '%s.dll'
+ v.implib_PATTERN = '%s.dll.a'
+ v.IMPLIB_ST = '-Wl,--out-implib,%s'
+
+ v.FCFLAGS_fcshlib = []
+
+ # Auto-import is enabled by default even without this option,
+ # but enabling it explicitly has the nice effect of suppressing the rather boring, debug-level messages
+ # that the linker emits otherwise.
+ v.append_value('LINKFLAGS', ['-Wl,--enable-auto-import'])
+
+@conf
+def fortran_modifier_cygwin(conf):
+ """
+ Defines Fortran flags for use on cygwin
+ """
+ fortran_modifier_win32(conf)
+ v = conf.env
+ v.fcshlib_PATTERN = 'cyg%s.dll'
+ v.append_value('LINKFLAGS_fcshlib', ['-Wl,--enable-auto-image-base'])
+ v.FCFLAGS_fcshlib = []
+
+# ------------------------------------------------------------------------
+
+@conf
+def check_fortran_dummy_main(self, *k, **kw):
+ """
+ Determines if a main function is needed by compiling a code snippet with
+ the C compiler and linking it with the Fortran compiler (useful on unix-like systems)
+ """
+ if not self.env.CC:
+ self.fatal('A c compiler is required for check_fortran_dummy_main')
+
+ lst = ['MAIN__', '__MAIN', '_MAIN', 'MAIN_', 'MAIN']
+ lst.extend([m.lower() for m in lst])
+ lst.append('')
+
+ self.start_msg('Detecting whether we need a dummy main')
+ for main in lst:
+ kw['fortran_main'] = main
+ try:
+ self.check_cc(
+ fragment = 'int %s() { return 0; }\n' % (main or 'test'),
+ features = 'c fcprogram',
+ mandatory = True
+ )
+ if not main:
+ self.env.FC_MAIN = -1
+ self.end_msg('no')
+ else:
+ self.env.FC_MAIN = main
+ self.end_msg('yes %s' % main)
+ break
+ except self.errors.ConfigurationError:
+ pass
+ else:
+ self.end_msg('not found')
+ self.fatal('could not detect whether fortran requires a dummy main, see the config.log')
+
+# ------------------------------------------------------------------------
+
+GCC_DRIVER_LINE = re.compile('^Driving:')
+POSIX_STATIC_EXT = re.compile(r'\S+\.a')
+POSIX_LIB_FLAGS = re.compile(r'-l\S+')
+
+@conf
+def is_link_verbose(self, txt):
+ """Returns True if 'useful' link options can be found in txt"""
+ assert isinstance(txt, str)
+ for line in txt.splitlines():
+ if not GCC_DRIVER_LINE.search(line):
+ if POSIX_STATIC_EXT.search(line) or POSIX_LIB_FLAGS.search(line):
+ return True
+ return False
+
+@conf
+def check_fortran_verbose_flag(self, *k, **kw):
+ """
+ Checks what kind of verbose (-v) flag works, then sets it to env.FC_VERBOSE_FLAG
+ """
+ self.start_msg('fortran link verbose flag')
+ for x in ('-v', '--verbose', '-verbose', '-V'):
+ try:
+ self.check_cc(
+ features = 'fc fcprogram_test',
+ fragment = FC_FRAGMENT2,
+ compile_filename = 'test.f',
+ linkflags = [x],
+ mandatory=True)
+ except self.errors.ConfigurationError:
+ pass
+ else:
+ # output is on stderr or stdout (for xlf)
+ if self.is_link_verbose(self.test_bld.err) or self.is_link_verbose(self.test_bld.out):
+ self.end_msg(x)
+ break
+ else:
+ self.end_msg('failure')
+ self.fatal('Could not obtain the fortran link verbose flag (see config.log)')
+
+ self.env.FC_VERBOSE_FLAG = x
+ return x
+
+# ------------------------------------------------------------------------
+
+# linkflags which match those are ignored
+LINKFLAGS_IGNORED = [r'-lang*', r'-lcrt[a-zA-Z0-9\.]*\.o', r'-lc$', r'-lSystem', r'-libmil', r'-LIST:*', r'-LNO:*']
+if os.name == 'nt':
+ LINKFLAGS_IGNORED.extend([r'-lfrt*', r'-luser32', r'-lkernel32', r'-ladvapi32', r'-lmsvcrt', r'-lshell32', r'-lmingw', r'-lmoldname'])
+else:
+ LINKFLAGS_IGNORED.append(r'-lgcc*')
+RLINKFLAGS_IGNORED = [re.compile(f) for f in LINKFLAGS_IGNORED]
+
+def _match_ignore(line):
+ """Returns True if the line should be ignored (Fortran verbose flag test)"""
+ for i in RLINKFLAGS_IGNORED:
+ if i.match(line):
+ return True
+ return False
+
+def parse_fortran_link(lines):
+ """Given the output of verbose link of Fortran compiler, this returns a
+ list of flags necessary for linking using the standard linker."""
+ final_flags = []
+ for line in lines:
+ if not GCC_DRIVER_LINE.match(line):
+ _parse_flink_line(line, final_flags)
+ return final_flags
+
+SPACE_OPTS = re.compile('^-[LRuYz]$')
+NOSPACE_OPTS = re.compile('^-[RL]')
+
+def _parse_flink_token(lexer, token, tmp_flags):
+ # Here we go (convention for wildcard is shell, not regex !)
+ # 1 TODO: we first get some root .a libraries
+ # 2 TODO: take everything starting by -bI:*
+ # 3 Ignore the following flags: -lang* | -lcrt*.o | -lc |
+ # -lgcc* | -lSystem | -libmil | -LANG:=* | -LIST:* | -LNO:*)
+ # 4 take into account -lkernel32
+ # 5 For options of the kind -[[LRuYz]], as they take one argument
+ # after, the actual option is the next token
+ # 6 For -YP,*: take and replace by -Larg where arg is the old
+ # argument
+ # 7 For -[lLR]*: take
+
+ # step 3
+ if _match_ignore(token):
+ pass
+ # step 4
+ elif token.startswith('-lkernel32') and sys.platform == 'cygwin':
+ tmp_flags.append(token)
+ # step 5
+ elif SPACE_OPTS.match(token):
+ t = lexer.get_token()
+ if t.startswith('P,'):
+ t = t[2:]
+ for opt in t.split(os.pathsep):
+ tmp_flags.append('-L%s' % opt)
+ # step 6
+ elif NOSPACE_OPTS.match(token):
+ tmp_flags.append(token)
+ # step 7
+ elif POSIX_LIB_FLAGS.match(token):
+ tmp_flags.append(token)
+ else:
+ # ignore anything not explicitly taken into account
+ pass
+
+ t = lexer.get_token()
+ return t
+
+def _parse_flink_line(line, final_flags):
+ """private"""
+ lexer = shlex.shlex(line, posix = True)
+ lexer.whitespace_split = True
+
+ t = lexer.get_token()
+ tmp_flags = []
+ while t:
+ t = _parse_flink_token(lexer, t, tmp_flags)
+
+ final_flags.extend(tmp_flags)
+ return final_flags
+
+@conf
+def check_fortran_clib(self, autoadd=True, *k, **kw):
+ """
+ Obtains the flags for linking with the C library
+ if this check works, add uselib='CLIB' to your task generators
+ """
+ if not self.env.FC_VERBOSE_FLAG:
+ self.fatal('env.FC_VERBOSE_FLAG is not set: execute check_fortran_verbose_flag?')
+
+ self.start_msg('Getting fortran runtime link flags')
+ try:
+ self.check_cc(
+ fragment = FC_FRAGMENT2,
+ compile_filename = 'test.f',
+ features = 'fc fcprogram_test',
+ linkflags = [self.env.FC_VERBOSE_FLAG]
+ )
+ except Exception:
+ self.end_msg(False)
+ if kw.get('mandatory', True):
+ conf.fatal('Could not find the c library flags')
+ else:
+ out = self.test_bld.err
+ flags = parse_fortran_link(out.splitlines())
+ self.end_msg('ok (%s)' % ' '.join(flags))
+ self.env.LINKFLAGS_CLIB = flags
+ return flags
+ return []
+
+def getoutput(conf, cmd, stdin=False):
+ """
+ Obtains Fortran command outputs
+ """
+ from waflib import Errors
+ if conf.env.env:
+ env = conf.env.env
+ else:
+ env = dict(os.environ)
+ env['LANG'] = 'C'
+ input = stdin and '\n'.encode() or None
+ try:
+ out, err = conf.cmd_and_log(cmd, env=env, output=0, input=input)
+ except Errors.WafError as e:
+ # An WafError might indicate an error code during the command
+ # execution, in this case we still obtain the stderr and stdout,
+ # which we can use to find the version string.
+ if not (hasattr(e, 'stderr') and hasattr(e, 'stdout')):
+ raise e
+ else:
+ # Ignore the return code and return the original
+ # stdout and stderr.
+ out = e.stdout
+ err = e.stderr
+ except Exception:
+ conf.fatal('could not determine the compiler version %r' % cmd)
+ return (out, err)
+
+# ------------------------------------------------------------------------
+
+ROUTINES_CODE = """\
+ subroutine foobar()
+ return
+ end
+ subroutine foo_bar()
+ return
+ end
+"""
+
+MAIN_CODE = """
+void %(dummy_func_nounder)s(void);
+void %(dummy_func_under)s(void);
+int %(main_func_name)s() {
+ %(dummy_func_nounder)s();
+ %(dummy_func_under)s();
+ return 0;
+}
+"""
+
+@feature('link_main_routines_func')
+@before_method('process_source')
+def link_main_routines_tg_method(self):
+ """
+ The configuration test declares a unique task generator,
+ so we create other task generators from there for fortran link tests
+ """
+ def write_test_file(task):
+ task.outputs[0].write(task.generator.code)
+ bld = self.bld
+ bld(rule=write_test_file, target='main.c', code=MAIN_CODE % self.__dict__)
+ bld(rule=write_test_file, target='test.f', code=ROUTINES_CODE)
+ bld(features='fc fcstlib', source='test.f', target='test')
+ bld(features='c fcprogram', source='main.c', target='app', use='test')
+
+def mangling_schemes():
+ """
+ Generate triplets for use with mangle_name
+ (used in check_fortran_mangling)
+ the order is tuned for gfortan
+ """
+ for u in ('_', ''):
+ for du in ('', '_'):
+ for c in ("lower", "upper"):
+ yield (u, du, c)
+
+def mangle_name(u, du, c, name):
+ """Mangle a name from a triplet (used in check_fortran_mangling)"""
+ return getattr(name, c)() + u + (name.find('_') != -1 and du or '')
+
+@conf
+def check_fortran_mangling(self, *k, **kw):
+ """
+ Detect the mangling scheme, sets FORTRAN_MANGLING to the triplet found
+
+ This test will compile a fortran static library, then link a c app against it
+ """
+ if not self.env.CC:
+ self.fatal('A c compiler is required for link_main_routines')
+ if not self.env.FC:
+ self.fatal('A fortran compiler is required for link_main_routines')
+ if not self.env.FC_MAIN:
+ self.fatal('Checking for mangling requires self.env.FC_MAIN (execute "check_fortran_dummy_main" first?)')
+
+ self.start_msg('Getting fortran mangling scheme')
+ for (u, du, c) in mangling_schemes():
+ try:
+ self.check_cc(
+ compile_filename = [],
+ features = 'link_main_routines_func',
+ msg = 'nomsg',
+ errmsg = 'nomsg',
+ dummy_func_nounder = mangle_name(u, du, c, 'foobar'),
+ dummy_func_under = mangle_name(u, du, c, 'foo_bar'),
+ main_func_name = self.env.FC_MAIN
+ )
+ except self.errors.ConfigurationError:
+ pass
+ else:
+ self.end_msg("ok ('%s', '%s', '%s-case')" % (u, du, c))
+ self.env.FORTRAN_MANGLING = (u, du, c)
+ break
+ else:
+ self.end_msg(False)
+ self.fatal('mangler not found')
+ return (u, du, c)
+
+@feature('pyext')
+@before_method('propagate_uselib_vars', 'apply_link')
+def set_lib_pat(self):
+ """Sets the Fortran flags for linking with Python"""
+ self.env.fcshlib_PATTERN = self.env.pyext_PATTERN
+
+@conf
+def detect_openmp(self):
+ """
+ Detects openmp flags and sets the OPENMP ``FCFLAGS``/``LINKFLAGS``
+ """
+ for x in ('-fopenmp','-openmp','-mp','-xopenmp','-omp','-qsmp=omp'):
+ try:
+ self.check_fc(
+ msg = 'Checking for OpenMP flag %s' % x,
+ fragment = 'program main\n call omp_get_num_threads()\nend program main',
+ fcflags = x,
+ linkflags = x,
+ uselib_store = 'OPENMP'
+ )
+ except self.errors.ConfigurationError:
+ pass
+ else:
+ break
+ else:
+ self.fatal('Could not find OpenMP')
+
+@conf
+def check_gfortran_o_space(self):
+ if self.env.FC_NAME != 'GFORTRAN' or int(self.env.FC_VERSION[0]) > 4:
+ # This is for old compilers and only for gfortran.
+ # No idea how other implementations handle this. Be safe and bail out.
+ return
+ self.env.stash()
+ self.env.FCLNK_TGT_F = ['-o', '']
+ try:
+ self.check_fc(msg='Checking if the -o link must be split from arguments', fragment=FC_FRAGMENT, features='fc fcshlib')
+ except self.errors.ConfigurationError:
+ self.env.revert()
+ else:
+ self.env.commit()