illumos gate

Build errors with clang:

    /code/illumos-gate/usr/src/lib/libcustr/common/custr.c:195:17: error: comparison of integers of different signs: 'size_t' (aka 'unsigned int') and 'int' [-Werror,-Wsign-compare]
            while (chunksz < len) {
                   ~~~~~~~ ^ ~~~
    1 error generated.

    cpcgen.c:123:9: error: missing field 'cwhite_human' initializer [-Werror,-Wmissing-field-initializers]
            { NULL }
                   ^
    cpcgen.c:161:44: error: missing field 'cpapi_papi' initializer [-Werror,-Wmissing-field-initializers]
            { "MEM_INST_RETIRED.STORES" "PAPI_sr_ins" },
                                                      ^
    cpcgen.c:162:43: error: missing field 'cpapi_papi' initializer [-Werror,-Wmissing-field-initializers]
            { "MEM_INST_RETIRED.LOADS" "PAPI_ld_ins" },
                                                     ^
    cpcgen.c:1217:42: error: format specifies type 'int' but the argument has type 'pid_t' (aka 'long') [-Werror,-Wformat]
            if (asprintf(&tmpname, ".%s.%d", fname, getpid()) == -1) {
                                        ~~          ^~~~~~~~
                                        %ld
    cpcgen.c:1286:42: error: format specifies type 'int' but the argument has type 'pid_t' (aka 'long') [-Werror,-Wformat]
            if (asprintf(&tmpname, ".%s.%d", fname, getpid()) == -1) {
                                        ~~          ^~~~~~~~
                                        %ld
    cpcgen.c:1625:42: error: format specifies type 'int' but the argument has type 'pid_t' (aka 'long') [-Werror,-Wformat]
            if (asprintf(&tmpname, ".%s.%d", fname, getpid()) == -1) {
                                        ~~          ^~~~~~~~
                                        %ld
    cpcgen.c:1834:42: error: format specifies type 'int' but the argument has type 'pid_t' (aka 'long') [-Werror,-Wformat]
                    if (asprintf(&tmpname, ".%s.%d", name, getpid()) == -1) {
                                                ~~         ^~~~~~~~
                                                %ld
    7 errors generated.

Some errors are because of not yet picked up warning suppression, some are otherwise interesting.