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import os
from .compilation import compile_run_strings
from .util import CompilerNotFoundError

def has_fortran():
    if not hasattr(has_fortran, 'result'):
        try:
            (stdout, stderr), info = compile_run_strings(
                [('main.f90', (
                    'program foo\n'
                    'print *, "hello world"\n'
                    'end program'
                ))], clean=True
            )
        except CompilerNotFoundError:
            has_fortran.result = False
            if os.environ.get('SYMPY_STRICT_COMPILER_CHECKS', '0') == '1':
                raise
        else:
            if info['exit_status'] != os.EX_OK or 'hello world' not in stdout:
                if os.environ.get('SYMPY_STRICT_COMPILER_CHECKS', '0') == '1':
                    raise ValueError("Failed to compile test program:\n%s\n%s\n" % (stdout, stderr))
                has_fortran.result = False
            else:
                has_fortran.result = True
    return has_fortran.result


def has_c():
    if not hasattr(has_c, 'result'):
        try:
            (stdout, stderr), info = compile_run_strings(
                [('main.c', (
                    '#include <stdio.h>\n'
                    'int main(){\n'
                    'printf("hello world\\n");\n'
                    'return 0;\n'
                    '}'
                ))], clean=True
            )
        except CompilerNotFoundError:
            has_c.result = False
            if os.environ.get('SYMPY_STRICT_COMPILER_CHECKS', '0') == '1':
                raise
        else:
            if info['exit_status'] != os.EX_OK or 'hello world' not in stdout:
                if os.environ.get('SYMPY_STRICT_COMPILER_CHECKS', '0') == '1':
                    raise ValueError("Failed to compile test program:\n%s\n%s\n" % (stdout, stderr))
                has_c.result = False
            else:
                has_c.result = True
    return has_c.result


def has_cxx():
    if not hasattr(has_cxx, 'result'):
        try:
            (stdout, stderr), info = compile_run_strings(
                [('main.cxx', (
                    '#include <iostream>\n'
                    'int main(){\n'
                    'std::cout << "hello world" << std::endl;\n'
                    '}'
                ))], clean=True
            )
        except CompilerNotFoundError:
            has_cxx.result = False
            if os.environ.get('SYMPY_STRICT_COMPILER_CHECKS', '0') == '1':
                raise
        else:
            if info['exit_status'] != os.EX_OK or 'hello world' not in stdout:
                if os.environ.get('SYMPY_STRICT_COMPILER_CHECKS', '0') == '1':
                    raise ValueError("Failed to compile test program:\n%s\n%s\n" % (stdout, stderr))
                has_cxx.result = False
            else:
                has_cxx.result = True
    return has_cxx.result