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Date: Thu, 14 Jul 2011 13:24:37 -0700
From: Isaac Dunham <>
Subject: musl-gcc vs. BusyBox 1.18.5: multiple definitions of '_start'

I'm trying to set up a musl-based busybox system, using a version of
musl (d3fd192523db544e6005051f224a2d7bafabedd9) that I pulled from git
just an hour or so ago (prefix=/opt/musl).
My host is Ubuntu 10.04 "Lucid Lynx" with gcc 4.4.3.
When I build busybox 1.18.5 with the default cc (gcc using eglibc), it
compiles appropriately.  But when I use "CC=musl-gcc", compilation fails
at the link step (I did a little patching to get that far, BTW):  
AR util-linux/volume_id/lib.a 
LINK    busybox_unstripped
Trying libraries: crypt m
Failed: -Wl,--start-group -lcrypt -lm -Wl,--end-group
Output of:
musl-gcc -Wall -Wshadow -Wwrite-strings -Wundef -Wstrict-prototypes
-Wunused -Wunused-parameter -Wunused-function -Wunused-value
-Wmissing-prototypes -Wmissing-declarations
-Wdeclaration-after-statement -Wold-style-definition
-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer
-ffunction-sections -fdata-sections -fno-guess-branch-probability
-funsigned-char -static-libgcc -falign-functions=1 -falign-jumps=1
-falign-labels=1 -falign-loops=1 -Os -march=i386
-mpreferred-stack-boundary=2 -static -o busybox_unstripped
-Wl,--sort-common -Wl,--sort-section,alignment -Wl,--gc-sections
-Wl,--start-group applets/built-in.o archival/lib.a
archival/libarchive/lib.a console-tools/lib.a coreutils/lib.a
coreutils/libcoreutils/lib.a debianutils/lib.a e2fsprogs/lib.a
editors/lib.a findutils/lib.a init/lib.a libbb/lib.a libpwdgrp/lib.a
loginutils/lib.a mailutils/lib.a miscutils/lib.a modutils/lib.a
networking/lib.a networking/libiproute/lib.a networking/udhcp/lib.a
printutils/lib.a procps/lib.a runit/lib.a selinux/lib.a shell/lib.a
sysklogd/lib.a util-linux/lib.a util-linux/volume_id/lib.a
archival/built-in.o archival/libarchive/built-in.o
console-tools/built-in.o coreutils/built-in.o
coreutils/libcoreutils/built-in.o debianutils/built-in.o
e2fsprogs/built-in.o editors/built-in.o findutils/built-in.o
init/built-in.o libbb/built-in.o libpwdgrp/built-in.o
loginutils/built-in.o mailutils/built-in.o miscutils/built-in.o
modutils/built-in.o networking/built-in.o
networking/libiproute/built-in.o networking/udhcp/built-in.o
printutils/built-in.o procps/built-in.o runit/built-in.o
selinux/built-in.o shell/built-in.o sysklogd/built-in.o
util-linux/built-in.o util-linux/volume_id/built-in.o -Wl,--end-group
-Wl,--start-group -lcrypt -lm -Wl,--end-group ==========
applets/built-in.o: In function `_start': (.text+0x0): multiple
definition of `_start' /opt/musl/lib/crt1.o:(.text+0x0): first defined
here collect2: ld returned 1 exit status make: *** [busybox_unstripped]
Error 1
=======END of error
grep + strings tell me that "_start" is found in crt1.o, and in the
"start.o" section of libc.a (and 

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