undefined references: __sync_fetch_and_add_4 and __sync_val_compare_and_swap_4

From: root <root at server dot boros dot com>
To: libc-alpha at sourceware dot org
Date: Tue, 6 Feb 2007 15:57:20 -0600 (CST)
Subject: undefined references: __sync_fetch_and_add_4 and __sync_val_compare_and_swap_4

Upon attempting to compile the latest libc from *cvs*, I get the following
errors when compiling.

make[4]: Leaving directory `/tmp/glibc-2.6/string'

make subdir=time -C ../time ..=../ objdir=/tmp/glibc-build -f Makefile -f

../elf/rtld-Rules rtld-all rtld-modules='rtld-setitimer.os'

make[4]: Entering directory `/tmp/glibc-2.6/time'

make[4]: Nothing to be done for `rtld-all'.

make[4]: Leaving directory `/tmp/glibc-2.6/time'

make[3]: Leaving directory `/tmp/glibc-2.6/elf'

gcc -nostdlib -nostartfiles -shared \

-Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both

-Wl,-z,defs -Wl,--verbose 2>&1 | \

LC_ALL=C \

sed -e '/^=========/,/^=========/!d;/^=========/d' \

-e 's/\. = 0 + SIZEOF_HEADERS;/& _begin = . -

SIZEOF_HEADERS;/' \

> /tmp/glibc-build/elf/ld.so.lds

gcc -nostdlib -nostartfiles -shared -o /tmp/glibc-build/elf/ld.so

\

-Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both

-Wl,-z,defs \

/tmp/glibc-build/elf/librtld.os

-Wl,--version-script=/tmp/glibc-build/ld.map \

-Wl,-soname=ld-linux.so.2 -T

/tmp/glibc-build/elf/ld.so.lds

/tmp/glibc-build/elf/librtld.os: In function `add_dependency':

/tmp/glibc-2.6/elf/dl-lookup.c:106: undefined reference to `__sync_fetch_and_add_4'

/tmp/glibc-2.6/elf/dl-lookup.c:110: undefined reference to

`__sync_val_compare_and_swap_4'

/tmp/glibc-build/elf/librtld.os: In function `_dl_profile_fixup':

/tmp/glibc-2.6/elf/dl-runtime.c:196: undefined reference to

`__sync_val_compare_and_swap_4'

/tmp/glibc-2.6/elf/dl-runtime.c:205: undefined reference to

`__sync_fetch_and_add_4'

/tmp/glibc-build/elf/librtld.os: In function `_dl_fixup':

/tmp/glibc-2.6/elf/dl-runtime.c:102: undefined reference to

`__sync_val_compare_and_swap_4'

/tmp/glibc-2.6/elf/dl-runtime.c:110: undefined reference to

`__sync_fetch_and_add_4'

/tmp/glibc-build/elf/librtld.os: In function `dl_open_worker':

/tmp/glibc-2.6/elf/dl-open.c:424: undefined reference to

`__sync_val_compare_and_swap_4'

/tmp/glibc-2.6/elf/dl-open.c:426: undefined reference to

`__sync_fetch_and_add_4'

/tmp/glibc-build/elf/librtld.os: In function `_dl_close_worker':

/tmp/glibc-2.6/elf/dl-close.c:406: undefined reference to

`__sync_val_compare_and_swap_4'

/tmp/glibc-2.6/elf/dl-close.c:408: undefined reference to

`__sync_fetch_and_add_4'

collect2: ld returned 1 exit status

make[2]: *** [/tmp/glibc-build/elf/ld.so] Error 1

I grepped through all the sources and I couldn't find any reference to
those two functions. This has been an issues with the latest libc for a
couple of weeks already.

Follow-Ups:

Re: undefined references: __sync_fetch_and_add_4 and __sync_val_compare_and_swap_4

From: Ulrich Drepper

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