SLAU132 User guide | 德州仪器 TI.com.cn

SLAU132V October 2004 – February 2020

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5.16.3 Strict ANSI Mode and Relaxed ANSI Mode (--strict_ansi and --relaxed_ansi)

Under relaxed ANSI/ISO mode (the default), the compiler accepts language extensions that could potentially conflict with a strictly conforming ANSI/ISO C/C++ program. Under strict ANSI mode, these language extensions are suppressed so that the compiler will accept all strictly conforming programs.

Use the --strict_ansi option when you know your program is a conforming program and it will not compile in relaxed mode. In this mode, language extensions that conflict with ANSI/ISO C/C++ are disabled and the compiler will emit error messages where the standard requires it to do so. Violations that are considered discretionary by the standard may be emitted as warnings instead.

Examples:

The following is strictly conforming C code, but will not be accepted by the compiler in the default relaxed mode. To get the compiler to accept this code, use strict ANSI mode. The compiler will suppress the interrupt keyword language exception, and interrupt may then be used as an identifier in the code.

int main()
{
    int interrupt = 0;
    return 0;
}

The following is not strictly conforming code. The compiler will not accept this code in strict ANSI mode. To get the compiler to accept it, use relaxed ANSI mode. The compiler will provide the interrupt keyword extension and will accept the code.

interrupt void isr(void);

int main()
{
    return 0;
}

The following code is accepted in all modes. The __interrupt keyword does not conflict with the ANSI/ISO C standard, so it is always available as a language extension.

__interrupt void isr(void);

int main()
{
    return 0;
}

The default mode is relaxed ANSI. This mode can be selected with the --relaxed_ansi (or -pr) option. Relaxed ANSI mode accepts the broadest range of programs. It accepts all TI language extensions, even those which conflict with ANSI/ISO, and ignores some ANSI/ISO violations for which the compiler can do something reasonable. Some GCC language extensions described in Section 5.17 may conflict with strict ANSI/ISO standards, but many do not conflict with the standards.