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Asked: 2026-05-20T04:39:40+00:00

Why does not GCC compile the C99 by default? I mean why is it

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Why does not GCC compile the C99 by default? I mean why is it necessary to add –std=c99 flag
everytime a code in C99 is written?

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  1. Editorial Team

    Edit: As of GCC 5, -std=gnu11 is the default. See Porting to GCC 5.

    See C Dialect Options, gnu89 is the default.

    `gnu89′

    GNU dialect of ISO C90 (including some
    C99 features). This is the default for
    C code.

    As @tsv mentioned, ISO C99 is not fully supported yet:

    `c99′
    `c9x’
    `iso9899:1999′
    `iso9899:199x’

    ISO C99. Note that this standard is not yet fully supported; see http://gcc.gnu.org/c99status.html for more information. The names `c9x’ and `iso9899:199x’ are deprecated.

    And also:

    `gnu99′
    `gnu9x’

    GNU dialect of ISO C99. When ISO C99 is fully implemented in GCC, this will become the default. The name `gnu9x’ is deprecated.

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