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6.39 C++ Style Comments

In GNU C, you may use C++ style comments, which start with ‘//’ and continue until the end of the line. Many other C implementations allow such comments, and they are included in the 1999 C standard. However, C++ style comments are not recognized if you specify an -std option specifying a version of ISO C before C99, or -ansi (equivalent to -std=c90).

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https://gcc.gnu.org/onlinedocs/gcc-7.3.0/gcc/C_002b_002b-Comments.html