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Date: Sat, 1 Dec 2018 19:18:21 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Cc: argante <argante@...me>
Subject: Re: static linking problem
On Sat, Dec 01, 2018 at 10:07:53PM +0000, argante wrote:
> Hi,
>
> Does anyone have any idea why this is happening? The compiler (7.3.0) doesn't produce a statically linked binaries.
>
> # cat test.c
> #include <stdio.h>
> int main() { printf("hello..\n"); return 0; }
> # gcc -static test.c
> # ldd a.out
> ldd (0x7f67f767e000)
> # readelf -d a.out
>
> Dynamic section at offset 0x1e88 contains 16 entries:
> Tag Type Name/Value
> 0x0000000000000010 (SYMBOLIC) 0x0
> 0x000000000000000c (INIT) 0x290
> 0x000000000000000d (FINI) 0x1207
> 0x0000000000000004 (HASH) 0x158
> 0x0000000000000005 (STRTAB) 0x180
> 0x0000000000000006 (SYMTAB) 0x168
> 0x000000000000000a (STRSZ) 1 (bytes)
> 0x000000000000000b (SYMENT) 24 (bytes)
> 0x0000000000000015 (DEBUG) 0x0
> 0x0000000000000003 (PLTGOT) 0x202000
> 0x0000000000000007 (RELA) 0x188
> 0x0000000000000008 (RELASZ) 264 (bytes)
> 0x0000000000000009 (RELAENT) 24 (bytes)
> 0x000000006ffffffb (FLAGS_1) Flags: PIE
> 0x000000006ffffff9 (RELACOUNT) 11
> 0x0000000000000000 (NULL) 0x0
This does not indicate that the program is dynamic-linked, just that
it's PIE. Use readelf -l and look for INTERP. If it's present, the
program is dynamic linked. If it's absent, the program is static
linked.
> # /usr/local/musl/bin/musl-gcc -static test.c
> # ldd a.out
> ldd (0x7f5a608f9000)
> # gcc -static -specs=/lib/musl-gcc.specs test.c
> # ldd a.out
> ldd (0x7fb6c936f000)
Is this the musl ldd? I believe it will do this or similar, and that's
a known bug or at least limitation. It should report that the program
is not dynamic-linked.
> # gcc -v
> Using built-in specs.
> COLLECT_GCC=gcc
> COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-linux-musl/7.3.0/lto-wrapper
> Target: x86_64-linux-musl
> Configured with: ./configure CFLAGS='-Os -g0' CXXFLAGS= --enable-languages=c,c++ --disable-nls --disable-multilib --disable-werror --disable-libmudflap --disable-libsanitizer --disable-gnu-indirect-function --disable-libmpx --disable-libssp --disable-symver --disable-libgomp --disable-fixed-point --enable-tls --enable-deterministic-archives --enable-__cxa_atexit --enable-default-pie --build=x86_64-linux-musl
> Thread model: posix
> gcc version 7.3.0 (GCC)
>
>
> without '-static' everything looks ok
>
> # gcc test.c
> # ldd a.out
> /lib/ld-musl-x86_64.so.1 (0x7ff0dca25000)
> libc.so => /lib/ld-musl-x86_64.so.1 (0x7ff0dca25000)
This is dynamic-linked, yes. But there's nothing wrong with your
static-linked program. If you really don't want pie, use -no-pie or a
toolchain that wasn't built to produce pie by default (gcc's
--enable-default-pie option at configure time).
Rich
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