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Message-ID: <5035E16E.50004@gmail.com>
Date: Thu, 23 Aug 2012 13:53:18 +0600
From: agent <agentprog@...il.com>
To: musl@...ts.openwall.com
Subject: build musl with clang
i am trying to build musl with clang 3.0 from ubuntu 12.04. musl itself
builds fairly fine with some notes on unused command line parameters and
coding style. but i have some issues compiling a simple hello world
program against this musl. the code is:
#include <stdio.h>
int main(int argc, char **argv) {
printf("Hello, World!\n");
return 0;
}
i have tried to link against musl both dynamically and statically. if i
compile a program with the default ld-linux.so dynamic linker the
program runs but fails at the end:
Hello, World!
Inconsistency detected by ld.so: dl-fini.c: 207: _dl_fini: Assertion `ns
!= 0 || i == nloaded' failed!
if i use musl's ld-musl (as far as i can notice it is just symlink to
libc.so) i get a segfault. gdb says:
(gdb) r
Starting program: /home/agent/dev/musl/musl-0.9.4_clang/lib/t.out
Program received signal SIGSEGV, Segmentation fault.
0xb7f9d73a in find_sym () from /lib/ld-musl-i386.so.1
(gdb) where
#0 0xb7f9d73a in find_sym () from /lib/ld-musl-i386.so.1
btw, exactly the same things happen when i try it with gcc (4.6.3 from
ubuntu).
if i compile statically with gcc the program works fine, but with clang
it even does not compile (i mean link):
/opt/musl-clang/lib/libc.a(vfprintf.o): In function `printf_core':
src/stdio/vfprintf.c:(.text+0x1088): undefined reference to `__udivdi3'
src/stdio/vfprintf.c:(.text+0x10a6): undefined reference to `__umoddi3'
/opt/musl-clang/lib/libc.a(vfprintf.o): In function `fmt_u':
src/stdio/vfprintf.c:(.text+0x1a11): undefined reference to `__udivdi3'
src/stdio/vfprintf.c:(.text+0x1a33): undefined reference to `__umoddi3'
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
i suppose those functions do not get into libc.a for some reason, but
they are in libc.so according to readelf.
my clang command lines:
dynamic link:
clang -Wall -nostdlib -nostdinc -Wl,-dynamic-linker
/lib/ld-musl-i386.so.1 -L/opt/musl-clang/lib -isystem
/opt/musl-clang/include/ /opt/musl-clang/lib/crt1.o
/opt/musl-clang/lib/crti.o t.c /opt/musl-clang/lib/crtn.o -o t.out -lc
static link:
clang -Wall -nostdlib -nostdinc -L/opt/musl-clang/lib -isystem
/opt/musl-clang/include/ /opt/musl-clang/lib/crt1.o
/opt/musl-clang/lib/crti.o t.c /opt/musl-clang/lib/crtn.o -o t.out
-static -lc
as far as i can see, musl do not provide crtbegin.o and crtend.o, clang
do not have it's own and if i add gcc's ones situation does not change.
maybe i am wrong with clang parameters (i based them on gcc spec
provided), maybe it is impossible to compile a working musl with clang
at this stage, maybe a quick fix can be applied (:
PS: sorry for so long message -- i'd like to be maximum verbose
PPS: and sorry for duplicates if any -- i didn't find any search on
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