7.20 --c99

Enables the compilation of C99 source code.

It enforces C only, and C++ syntax is not accepted.

Usage

This option can also be combined with other source language command-line options. For example, armcc --c99 --gnu.
To ensure conformance with the ISO/IEC 9899:1999, the 1999 International Standard for C, you must also use the --strict option.

Default

For files having a suffix of .c, .ac, or .tc, --c90 applies by default.
Related reference
7.19 --c90
7.74 --gnu
7.25 --cpp
7.156 --strict, --no_strict
7.26 --cpp11
7.27 --cpp_compat
1.2 Source language modes of the compiler
2.7 Filename suffixes recognized by the compiler
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