Fixes #8541 by getting version from -dumpversion then --version as fallback
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		@@ -36,9 +36,7 @@ def check_arm_gcc_version():
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    """Returns True if the arm-none-eabi-gcc version is not known to cause problems.
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    """
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    if 'output' in ESSENTIAL_BINARIES['arm-none-eabi-gcc']:
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        first_line = ESSENTIAL_BINARIES['arm-none-eabi-gcc']['output'].split('\n')[0]
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        second_half = first_line.split(')', 1)[1].strip()
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        version_number = second_half.split()[0]
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        version_number = ESSENTIAL_BINARIES['arm-none-eabi-gcc']['output'].strip()
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        cli.log.info('Found arm-none-eabi-gcc version %s', version_number)
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    return True  # Right now all known arm versions are ok
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@@ -48,8 +46,7 @@ def check_avr_gcc_version():
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    """Returns True if the avr-gcc version is not known to cause problems.
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    """
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    if 'output' in ESSENTIAL_BINARIES['avr-gcc']:
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        first_line = ESSENTIAL_BINARIES['avr-gcc']['output'].split('\n')[0]
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        version_number = first_line.split()[2]
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        version_number = ESSENTIAL_BINARIES['avr-gcc']['output'].strip()
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        major, minor, rest = version_number.split('.', 2)
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        if int(major) > 8:
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@@ -154,14 +151,18 @@ def is_executable(command):
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        return False
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    # Make sure the command can be executed
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    check = run([command, '--version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=5, universal_newlines=True)
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    check = subprocess.run([command, '-dumpversion'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=5, universal_newlines=True)
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    if check.returncode > 1:  # if -dumpversion returns error check with --version instead
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        check = subprocess.run([command, '--version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=5, universal_newlines=True)
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    ESSENTIAL_BINARIES[command]['output'] = check.stdout
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    if check.returncode in [0, 1]:  # Older versions of dfu-programmer exit 1
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        cli.log.debug('Found {fg_cyan}%s', command)
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        return True
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    cli.log.error("{fg_red}Can't run `%s --version`", command)
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    cli.log.error("{fg_red}Can't get version number of `%s`", command)
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    return False
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