B.2.148 -xtransition

Issues warnings for the differences between K&R C and Sun ISO C.

The -xtransition option issues warnings in conjunction with the -Xa and -Xt options. You can eliminate all warning messages about differing behavior through appropriate coding. The following warnings no longer appear unless you issue the -xtransition option:

• \a is ISO C “alert” character

• \x is ISO C hex escape

• bad octal digit

• base type is really type tag: name

• comment is replaced by “##”

• comment does not concatenate tokens

• declaration introduces new type in ISO C: type tag

• macro replacement within a character constant

• macro replacement within a string literal

• no macro replacement within a character constant

• no macro replacement within a string literal

• operand treated as unsigned

• trigraph sequence replaced

• ISO C treats constant as unsigned: operator

• semantics of operator change in ISO C; use explicit cast