Source: http://www.nabble.com/-PATCH--uclibc-extern-inline-td14223616.html

Description:

Needed for uclibc-0.9.29 to compile with gcc 4.3.1

You get this error without

libc/libc_so.a(libc_pthread_init.oS): In function `testandset':
libc_pthread_init.c:(.text+0x0): multiple definition of `testandset'
libc/libc_so.a(forward.oS):forward.c:(.text+0x0): first defined here
libc/libc_so.a(rpc_thread.oS): In function `testandset':
rpc_thread.c:(.text+0x0): multiple definition of `testandset'
libc/libc_so.a(forward.oS):forward.c:(.text+0x0): first defined here
make[1]: *** [lib/libc.so] Error 1
make: *** [lib/libc.so.0] Error 2


---
 Rules.mak |    1 +
 1 file changed, 1 insertion(+)

Index: uClibc-0.9.29/Rules.mak
===================================================================
--- uClibc-0.9.29.orig/Rules.mak	2008-08-19 13:43:56.000000000 -0700
+++ uClibc-0.9.29/Rules.mak	2008-08-19 13:45:04.000000000 -0700
@@ -402,6 +402,7 @@ CFLAGS += -DSTATIC
 endif
 
 CFLAGS += $(call check_gcc,-std=gnu99,)
+CFLAGS += $(call check_gcc,-fgnu89-inline,)
 
 LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared --warn-common --warn-once -z combreloc
 # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok