fprintf warnings with "%lu" and a size_t value in infcover.c on a 32-bit build #930
Description
Seeing the same warning with gcc & clang on Ubuntu. clang helpfully suggests the fix to change the %lu into %zu
Not sure how far back into the past that %zu goes but both gcc & clang set to c89 mode build fine with %zu. Suspect that there may still be some compilers that will barf at %zu .
Other options are to cast the values to unsigned long or to use uLong for these values like in z_stream
This is what I see with gcc
$ CFLAGS="-m32" CC=gcc ./configure && make infcover
...
gcc -m32 -D_LARGEFILE64_SOURCE=1 -DHAVE_HIDDEN -I. -c -o infcover.o test/infcover.c
test/infcover.c: In function ‘mem_used’:
test/infcover.c:188:28: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
188 | fprintf(stderr, "%s: %lu allocated\n", prefix, zone->total);
| ~~^ ~~~~~~~~~~~
| | |
| long unsigned int size_t {aka unsigned int}
| %u
test/infcover.c: In function ‘mem_high’:
test/infcover.c:196:28: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
196 | fprintf(stderr, "%s: %lu high water mark\n", prefix, zone->highwater);
| ~~^ ~~~~~~~~~~~~~~~
| | |
| long unsigned int size_t {aka unsigned int}
| %u
test/infcover.c: In function ‘mem_done’:
test/infcover.c:221:35: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
221 | fprintf(stderr, "** %s: %lu bytes in %d blocks not freed\n",
| ~~^
| |
| long unsigned int
| %u
222 | prefix, zone->total, count);
| ~~~~~~~~~~~
| |
| size_t {aka unsigned int}
This is with clang
clang -m32 -D_LARGEFILE64_SOURCE=1 -DHAVE_HIDDEN -I. -c -o infcover.o test/infcover.c
test/infcover.c:188:52: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
fprintf(stderr, "%s: %lu allocated\n", prefix, zone->total);
~~~ ^~~~~~~~~~~
%zu
test/infcover.c:196:58: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
fprintf(stderr, "%s: %lu high water mark\n", prefix, zone->highwater);
~~~ ^~~~~~~~~~~~~~~
%zu
test/infcover.c:222:25: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
prefix, zone->total, count);
^~~~~~~~~~~
3 warnings generated.