undefined references: __sync_fetch_and_add_4 and __sync_val_compare_and_swap_4

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尝试编译最新版 glibc 时出现未定义引用错误，涉及 __sync_fetch_and_add_4 和 __sync_val_compare_and_swap_4 函数。错误出现在 dl-lookup.c 和 dl-runtime.c 文件中。

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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.