From: Ilya Trukhanov <lahvuun@gmail.com>
To: libc-help@sourceware.org
Subject: Dynamic loader path on x86_64
Date: Sun, 2 Jan 2022 19:29:10 +0200 [thread overview]
Message-ID: <20220102172910.au2emqbo5ntutxkk@lahvuun.lan> (raw)
Hello!
I'm building glibc-2.34 on x86_64 for a no-multilib prefix like so:
$ mkdir build && cd build
$ ../configure --prefix=/pfx
$ make -j16
$ make install
After looking at sysdeps/unix/sysv/linux/x86_64/ldconfig.h:
#define SYSDEP_KNOWN_INTERPRETER_NAMES \
{ "/lib/ld-linux.so.2", FLAG_ELF_LIBC6 }, \
{ "/libx32/ld-linux-x32.so.2", FLAG_ELF_LIBC6 }, \
{ "/lib64/ld-linux-x86-64.so.2", FLAG_ELF_LIBC6 },
I'd expect the loader to be installed to
/pfx/lib64/ld-linux-x86-64.so.2, but it is instead installed to
/pfx/lib/ld-linux-x86-64.so.2, breaking (at least) /pfx/bin/ldd, which
gives me "not a dynamic executable" for all files. Strace hints at the
problem:
...
faccessat2(AT_FDCWD, "/pfx/lib/ld-linux.so.2", X_OK, AT_EACCESS) = -1 ENOENT (No such file or directory)
faccessat2(AT_FDCWD, "/pfx/lib64/ld-linux-x86-64.so.2", X_OK, AT_EACCESS) = -1 ENOENT (No such file or directory)
faccessat2(AT_FDCWD, "/pfx/libx32/ld-linux-x32.so.2", X_OK, AT_EACCESS) = -1 ENOENT (No such file or directory)
...
Indeed, symlinking /pfx/lib64 to /pfx/lib makes it work.
Is this some sort of multilib quirk? Aarch64 and riscv ldconfig.h seem
to have theirs at /lib just fine.
Is the lib64->lib symlink the intended way to solve this?
Would things break if I simply patch ldconfig.h to add
{ "/lib/ld-linux-x86-64.so.2", FLAG_ELF_LIBC6 }?
Is there better way to do this that I'm not aware of, maybe?
Best,
Ilya Trukhanov.
next reply other threads:[~2022-01-02 17:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-02 17:29 Ilya Trukhanov [this message]
2022-01-03 17:31 ` Adhemerval Zanella
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