I think it means array ELEMENT, not subscript, has type char.
(Also, once upon a time char widened to int...)
John
On Thursday, 26 March 2020, 21:23:41 GMT, Åke Rehnman
<[email protected]> wrote:
Hello all,
newlib forces parameter c to isalnum(c) to be unsigned char or int.
BR
/Ake
In file included from ../src/helper/system.h:29,
from ./config.h:338,
from ../src/flash/nor/nrf5.c:22:
../src/flash/nor/nrf5.c: In function ‘nrf5_info_variant_to_str’:
../src/flash/nor/nrf5.c:575:16: error: array subscript has type ‘char’
[-Werror=char-subscripts]
575 | if (isalnum(bf[0]) && isalnum(bf[1]) && isalnum(bf[2]) &&
isalnum(bf[3]))
| ~~^~~
../src/flash/nor/nrf5.c:575:34: error: array subscript has type ‘char’
[-Werror=char-subscripts]
575 | if (isalnum(bf[0]) && isalnum(bf[1]) && isalnum(bf[2]) &&
isalnum(bf[3]))
| ~~^~~
../src/flash/nor/nrf5.c:575:52: error: array subscript has type ‘char’
[-Werror=char-subscripts]
575 | if (isalnum(bf[0]) && isalnum(bf[1]) && isalnum(bf[2]) &&
isalnum(bf[3]))
| ~~^~~
../src/flash/nor/nrf5.c:575:70: error: array subscript has type ‘char’
[-Werror=char-subscripts]
575 | if (isalnum(bf[0]) && isalnum(bf[1]) && isalnum(bf[2]) &&
isalnum(bf[3]))
| ~~^~~
from ctype.h:
/* 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. */
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