Compiling distcc3.2rc1 on Windows/Cygwin causes some compiler warnings of the
following form:
cc1: warnings being treated as errors
../src/gcc-id.c: In function ‘strip_bad_chars’:
../src/gcc-id.c:45:13: error: array subscript has type ‘char’
Makefile:448: recipe for target `src/gcc-id.o' failed
The problem with these warnings is that they are treated as errors by default
(unless --disable-Werror is passed to configure)
The following macros are involved (copied from ctype.h):
# define tolower(__c) \
__extension__ ({ __typeof__ (__c) __x = (__c); \
isupper (__x) ? (int) __x - 'A' + 'a' : (int) __x;})
#define isupper(__c) ((__ctype_lookup(__c)&(_U|_L))==_U)
/* These macros are intentionally written in a manner that will trigger
a gcc -Wall warning if the user mistakenly passes a 'char' instead
of an int containing an 'unsigned char'. Note that the sizeof will
always be 1, which is what we want for mapping EOF to __ctype_ptr__[0];
the use of a raw index inside the sizeof triggers the gcc warning if
__c was of type char, and sizeof masks side effects of the extra __c.
Meanwhile, the real index to __ctype_ptr__+1 must be cast to int,
since isalpha(0x100000001LL) must equal isalpha(1), rather than being
an out-of-bounds reference on a 64-bit machine. */
#define __ctype_lookup(__c) ((__ctype_ptr__+sizeof(""[__c]))[(int)(__c)])
Unfortunately, I don't understand what should be wrong with the distcc source
code. Maybe someone else has a clue what's wrong (a cygwin/newlib bug?). IMHO
it would be nice to fix this issue in order to make a "./configure && make &&
make install" work on cygwin.
Original issue reported on code.google.com by zull...@gmail.com on 24 Feb 2013 at 10:32
Original issue reported on code.google.com by
zull...@gmail.comon 24 Feb 2013 at 10:32