4.6.3.4 Std Option

The -std=standard option specifies the C standard to which the compiler assumes source code will conform. Allowable standards and devices are tabulated below.

Note that MPLAB XC8 uses a different compiler front end for these two standards, thus you might see a change in compiler behavior when swapping between standards.

Table 4-20. Acceptable C Language Standards
Standard	Supports
`c89` or `c90`	ISO C90 (ANSI) programs (using the P1 front end for all devices).
`c99`	ISO C99 programs (using the Clang front end for PIC18 and Enhanced mid-range devices).

The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.