BTW I forgot to report that I intended to test this on 32-bit ARM too, because that sometimes triggers "funny" behavior, but the build fails like this:
In file included from tuplesort.c:630: mk_qsort_tuple.c: In function ‘mkqs_compare_datum_by_shortcut’: mk_qsort_tuple.c:167:23: warning: implicit declaration of function ‘ApplySignedSortComparator’; did you mean ‘ApplyUnsignedSortComparator’? [-Wimplicit-function-declaration] 167 | ret = ApplySignedSortComparator(tuple1->datum1, | ^~~~~~~~~~~~~~~~~~~~~~~~~ | ApplyUnsignedSortComparator mk_qsort_tuple.c: In function ‘mkqs_compare_tuple’: mk_qsort_tuple.c:376:23: warning: implicit declaration of function ‘qsort_tuple_signed_compare’; did you mean ‘qsort_tuple_unsigned_compare’? [-Wimplicit-function-declaration] 376 | ret = qsort_tuple_signed_compare(a, b, state); | ^~~~~~~~~~~~~~~~~~~~~~~~~~ | qsort_tuple_unsigned_compare /usr/bin/ld: utils/sort/tuplesort.o: in function `mkqs_compare_datum_by_shortcut': /home/debian/postgres/src/backend/utils/sort/mk_qsort_tuple.c:167: undefined reference to `ApplySignedSortComparator' /usr/bin/ld: /home/debian/postgres/src/backend/utils/sort/mk_qsort_tuple.c:167: undefined reference to `ApplySignedSortComparator' /usr/bin/ld: /home/debian/postgres/src/backend/utils/sort/mk_qsort_tuple.c:167: undefined reference to `ApplySignedSortComparator' /usr/bin/ld: utils/sort/tuplesort.o: in function `mkqs_compare_tuple': /home/debian/postgres/src/backend/utils/sort/mk_qsort_tuple.c:376: undefined reference to `qsort_tuple_signed_compare' /usr/bin/ld: utils/sort/tuplesort.o: in function `mkqs_compare_datum_by_shortcut': /home/debian/postgres/src/backend/utils/sort/mk_qsort_tuple.c:167: undefined reference to `ApplySignedSortComparator' collect2: error: ld returned 1 exit status make[2]: *** [Makefile:67: postgres] Error 1 make[1]: *** [Makefile:42: all-backend-recurse] Error 2 make: *** [GNUmakefile:11: all-src-recurse] Error 2 I haven't investigated why it fails. regards -- Tomas Vondra EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company