I built a 32-bit dynamically linked Postgres using musl but I can't run on some machines because posix_fallocate() returns 95, "not supported".

Here's a sample program that reproduces the issue even when compiled statically. Any suggestions?

# Build a 32-bit static executable. Works.

$ cat test_posix_fallocate.c

#include <stdio.h>

#include <fcntl.h>

int main() {

int fd = open("foo", O_RDWR|O_CREAT, 0666);

if (fd < 0) return 1;

printf("posix_fallocate() returned %d\n", posix_fallocate(fd, 0, 400000));

}

$ uname -mrs

Linux 4.4.0-116-generic i686

$ musl-gcc -static -o test_posix_fallocate test_posix_fallocate.c

$ test_posix_fallocate

posix_fallocate() returned 0

# Copy it to an older OS. Fails.

$ uname -mrs

Linux 2.6.32-358.14.1.el6.x86_64 x86_64

$ test_posix_fallocate

posix_fallocate() returned 95