GNU Fortran Compiler Options Quiz
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Questions and Answers

What does the -Wintrinsic-shadow option do?

  • Warns if a procedure has the same name as an intrinsic. (correct)
  • Provides hints for optimizing intrinsic procedures.
  • Automatically renames user-defined procedures.
  • Suppresses warnings about intrinsic procedures.

    • What are the implications of using the -Wunused-parameter option in gfortran?

  • It is included in the -Wall option.
  • It ignores all parameter warnings.
  • It warns about unused PARAMETER values. (correct)
  • It warns about unused dummy arguments.

    • What does the -Werror option accomplish?

  • It turns all warnings into errors. (correct)
  • It suppresses all warnings during compilation.
  • It converts errors into warnings.
  • It treats all warnings as non-critical.

    • What is the primary use of the -fdump-parse-tree option?

    <p>To debug the internal working of the gfortran compiler.</p> Signup and view all the answers

    Which IEEE exceptions can be specified with the -ffpe-trap option?

    <p>Invalid, zero, overflow, underflow, precision, and denormal.</p> Signup and view all the answers

    What happens when the -Walign-commons option is activated?

    <p>It warns about variable padding for alignment in COMMON blocks.</p> Signup and view all the answers

    Which option is used to suppress the warnings generated by -Walign-commons?

    <p>-Wno-align-commons</p> Signup and view all the answers

    What does the parameter 'list' in the -ffpe-trap option represent?

    <p>A list of specific IEEE exceptions to raise for FPE.</p> Signup and view all the answers

    Which version of the Fortran standard is NOT fully supported by the GNU Fortran compiler?

    <p>Fortran 2008</p> Signup and view all the answers

    What is the primary purpose of the gfortran command?

    <p>To invoke the GNU Fortran compiler</p> Signup and view all the answers

    What happens after the compilation of a Fortran program using gfortran?

    <p>The source code is translated into machine code</p> Signup and view all the answers

    Which of the following best describes the errors the Fortran 90 standard requires the compiler to report?

    <p>Flaws in source code that prevent binary creation</p> Signup and view all the answers

    What is a key benefit of using high-level programming languages like Fortran over machine code?

    <p>They are faster to write</p> Signup and view all the answers

    Which of the following statements is true regarding the GNU Fortran compiler's support for language standards?

    <p>It completely supports Fortran 77, 90, and 95 standards.</p> Signup and view all the answers

    In what case will the GNU Fortran compiler provide error messages to users?

    <p>When the source code is flawed</p> Signup and view all the answers

    Which of the following is NOT a goal of the GNU Fortran compiler?

    <p>Providing a debugging environment for users</p> Signup and view all the answers

    What does the option '-fopenmp' enable in a Fortran program?

    <p>OpenMP directives and runtime library linking</p> Signup and view all the answers

    What is the consequence of using '-fno-range-check' in a Fortran compilation?

    <p>Expressions outside the range will be assigned +Inf or -Inf</p> Signup and view all the answers

    Which of the following standards does the option '-std=legacy' refer to?

    <p>Old non-standard programs without warnings</p> Signup and view all the answers

    Which option specifies that preprocessing should be enabled in Fortran?

    <p>-cpp</p> Signup and view all the answers

    What is the default standard value for Fortran when no standard is specified?

    <p>gnu</p> Signup and view all the answers

    What does the option '-std=f2003' enforce during compilation?

    <p>Strict conformance to Fortran 2003 standards</p> Signup and view all the answers

    What will occur if an integer overflow is detected with '-fno-range-check' option?

    <p>The value will wrap around to -1</p> Signup and view all the answers

    When enabling OpenMP with '-fopenmp', which feature is also implicitly enabled?

    <p>Recursive function support</p> Signup and view all the answers

    What is the impact of using the option '-fmax-stack-var-size=n'?

    <p>It affects the size of the largest array placed on the stack.</p> Signup and view all the answers

    Which option should be used to allow recursive procedures without the RECURSIVE attribute?

    <p>-frecursive</p> Signup and view all the answers

    What does the '-fpack-derived' option do?

    <p>It packs derived type members closely together.</p> Signup and view all the answers

    How does the '-frepack-arrays' option affect array handling?

    <p>It ensures data is passed contiguously for better performance.</p> Signup and view all the answers

    What is the consequence of using the '-fshort-enums' option?

    <p>It allows all enumerators to fit into the smallest INTEGER kind.</p> Signup and view all the answers

    What is a potential downside of using the '-fpack-derived' option?

    <p>It could lead to incompatibilities with other compiled code.</p> Signup and view all the answers

    What is the default value for the '-fmax-stack-var-size' option?

    <p>32768</p> Signup and view all the answers

    What happens when the size of an array exceeds the limit set by '-fmax-stack-var-size'?

    <p>Static memory will be used instead of stack memory.</p> Signup and view all the answers

    What type of function is BESSEL_J1?

    <p>Bessel function of the first kind of order 1</p> Signup and view all the answers

    Which function is used to test for NaN (Not a Number) values?

    <p>ISNAN</p> Signup and view all the answers

    The CEILING function is used to:

    <p>Round up to the nearest integer</p> Signup and view all the answers

    Which intrinsic function would you use to get the current time as a string?

    <p>CTIME</p> Signup and view all the answers

    Which function provides the bit size inquiry for a variable?

    <p>BIT_SIZE</p> Signup and view all the answers

    What does the MOD function do?

    <p>Returns the remainder of a division</p> Signup and view all the answers

    To convert a double precision real number to a default real number, which function would you use?

    <p>SNGL</p> Signup and view all the answers

    Which function would you use to remove trailing blank characters from a string?

    <p>TRIM</p> Signup and view all the answers

    What is the purpose of the EXIT function?

    <p>To terminate a program or process</p> Signup and view all the answers

    Which function calculates the Euclidean distance between two points?

    <p>HYPOT</p> Signup and view all the answers

    Which function can be used to initialize a pseudo-random number sequence?

    <p>RANDOM_SEED</p> Signup and view all the answers

    What does the LEN_TRIM function return?

    <p>The length excluding trailing blanks</p> Signup and view all the answers

    Which of the following functions converts an integer to a default real type?

    <p>FLOAT</p> Signup and view all the answers

    Which of the following file extensions will GNU Fortran recognize for compiling Fortran source code?

    <p>.f90</p> Signup and view all the answers

    What is the purpose of the GCC middle end in the compilation process?

    <p>Optimizes code</p> Signup and view all the answers

    What is the role of the 'gfortran' driver program within the GCC?

    <p>It automatically links Fortran runtime libraries</p> Signup and view all the answers

    Which statement about preprocessing and conditional compilation in GNU Fortran is correct?

    <p>The GNU C Preprocessor is commonly used for preprocessing.</p> Signup and view all the answers

    How does GCC determine whether to treat a source file as fixed form or free form?

    <p>By the file extension</p> Signup and view all the answers

    What is the primary document that provides a complete reference for the GNU Fortran compiler?

    <p>GNU Fortran and GCC Manual</p> Signup and view all the answers

    Which command does the gcc driver program primarily use to compile Fortran source files?

    <p>f951</p> Signup and view all the answers

    What characteristic do the capitalized file extensions have when processed by the GNU Fortran compiler?

    <p>They undergo preprocessing.</p> Signup and view all the answers

    Study Notes

    GNU Fortran Compiler

    • GNU Fortran is a Fortran compiler, part of the GCC compiler suite.
    • It supports Fortran 77, 90, 95, parts of 2003 and 2008 standards.
    • It also supports some vendor extensions.

    GNU Fortran Documentation

    • Published by the Free Software Foundation
    • Licensed under the GNU Free Documentation License.
    • The manual covers invoking GNU Fortran, its command options, runtime, language reference, extensions, mixed-language programming, intrinsic procedures, modules, and contributing sections.

    Table of Contents

    • The table of contents details sections within the manual, including specific topics like introduction, command options, runtime, language reference, extensions, etc.
    • The table is organized by Parts and sections.

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    GNU Fortran PDF

    Description

    Test your knowledge about various options available in the GNU Fortran compiler. This quiz covers options like -Wintrinsic-shadow, -Wunused-parameter, and more, helping you understand their implications and uses. Perfect for students and developers looking to deepen their understanding of Fortran compiler behavior.

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