memcached: drop libhugetlbfs

In Linux, memcached relies on transparent huge pages, and even if
libhugetlbfs is enabled by the PACKAGECONFIG (and detected during
do_configure, of course), it is simply not used:

root@qemuriscv64:~# ldd $(which memcached)
    linux-vdso.so.1 (0x0000003fa4358000)
    libevent-2.1.so.7 => /lib/libevent-2.1.so.7 (0x0000003fa42b0000)
    libc.so.6 => /lib/libc.so.6 (0x0000003fa4157000)
    /usr/lib/ld-linux-riscv64-lp64d.so.1 (0x0000003fa435a000)

The main reason is the fact that the only call to a function coming from
libhugetlbfs is here:

https://github.com/memcached/memcached/blob/master/memcached.c#L4274

and getpagesizes() is only called if the #if block evaluates to true:

    int ret = -1;
    size_t sizes[32];
    int avail = getpagesizes(sizes, 32);
(...)
    /* check if transparent hugepages is compiled into the kernel */
    /* RH based systems possibly uses a different path */
    static const char *mm_thp_paths[] = {
        "/sys/kernel/mm/transparent_hugepage/enabled",
        "/sys/kernel/mm/redhat_transparent_hugepage/enabled",
        NULL
    };
(...)

This block relies on HAVE_MEMCNTL, which is a Solaris-specific feature.
Therefore, the dependency link between memcached and libhugetlbfs
doesn't exist in Linux.

Drop libhugetlbfs from memcached's recipe.

Signed-off-by: João Marcos Costa <joaomarcos.costa@bootlin.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions