shared/base-filesystem: add define for arm64

https://wiki.debian.org/ArchitectureSpecificsMemo:
> arm64 aarch64-linux-gnu 64 AARCH64 /lib/ld-linux-aarch64.so.1 aarch64 aarch64

Fedora:
$ ls -l /lib /lib64
lrwxrwxrwx. 1 root root 7 Jul 27  2020 /lib -> usr/lib
lrwxrwxrwx. 1 root root 9 Jul 27  2020 /lib64 -> usr/lib64
$ ldd /bin/sh|grep ld
/lib/ld-linux-aarch64.so.1 (0x0000ffff8c905000)
$ ls -l /lib/ld-linux-aarch64.so.1 /lib64/ld-2.32.so
lrwxrwxrwx. 1 root root     19 Jul 13 07:28 /lib/ld-linux-aarch64.so.1 -> ../lib64/ld-2.32.so
-rwxr-xr-x. 1 root root 961248 Jul 13 07:56 /lib64/ld-2.32.so

$ uname -r
5.14.16-101.fc33.aarch64

So we need both /lib and /lib64 to be present, even though the canonical linker
path uses /lib.

diff --git a/src/shared/base-filesystem.c b/src/shared/base-filesystem.c
index 90fc5282a1ff9f6f4b917e5c1e766d0106b9c7d8..a07cd22e7ed40b682cae85f5a8bb1896e930bb42 100644 (file)
--- a/src/shared/base-filesystem.c
+++ b/src/shared/base-filesystem.c
@@ -46,6 +46,12 @@ static const BaseFilesystem table[] = {
          * create the symlink as needed should it be missing. We prefer doing this consistently with Debian's
          * multiarch logic, but support Fedora-style multilib too.*/
 #if defined(__aarch64__)
+        /* aarch64 ELF ABI actually says dynamic loader is in /lib/, but Fedora puts it in /lib64/ anyway and
+         * just symlinks /lib/ld-linux-aarch64.so.1 to ../lib64/ld-linux-aarch64.so.1. For this to work
+         * correctly, /lib64/ must be symlinked to /usr/lib64/. */
+        { "lib64",    0, "usr/lib/aarch64-linux-gnu\0"
+                         "usr/lib64\0",                "ld-linux-aarch64.so.1" },
+#  define KNOW_LIB64_DIRS 1
 #elif defined(__alpha__)
 #elif defined(__arc__) || defined(__tilegx__)
 #elif defined(__arm__)