A.2.184 -xtrigraphs[={yes|no}]

Enables or disables recognition of trigraph sequences as defined by the ISO/ANSI C standard.

If your source code has a literal string containing question marks (?) that the compiler is interpreting as a trigraph sequence, you can use the -xtrigraph=no suboption to turn off the recognition of trigraph sequences.

A.2.184.1 Values

You can specify one of the following two values for -xtrigraphs:

Defaults

When you do not include the -xtrigraphs option on the command line, the compiler assumes -xtrigraphs=yes.

If only -xtrigraphs is specified, the compiler assumes -xtrigraphs=yes.

Examples

Consider the following example source file named trigraphs_demo.cc.

#include <stdio.h>

int main ()
{
    (void) printf("(\?\?) in a string appears as (??)\n");
    return 0;
}

Here is the output if you compile this code with -xtrigraphs=yes.

example% CC -xtrigraphs=yes trigraphs_demo.cc
example% a.out
(??) in a string appears as (]

Here is the output if you compile this code with -xtrigraphs=no.

example% CC -xtrigraphs=no trigraphs_demo.cc
example% a.out
(??) in a string appears as (??)

See also

For information on trigraphs, see the C User’s Guide chapter about transitioning to ANSI/ISO C.