[Flex-devel] flex generated files collide with GCC flag

[Jan E. <je...@me...>]

Hi,



when one uses GCC's -Wredundant-decls, an ugly extra warning appears:

cc1: warnings being treated as errors
<stdout>:3279: error: redundant redeclaration of `isatty'
/usr/include/unistd.h:757: error: previous declaration of `isatty' was here
make[1]: *** [scanner.o] Error 1

Since the .l file in question does not contain any use of isatty, I 
wonder what that extra declaration that flex puts in is there for.

#ifndef __cplusplus
extern int isatty (int );
#endif /* __cplusplus */