[PATCH] Kbuild: provide a __UNIQUE_ID for clang

On Mon, Feb 08, 2016 at 03:38:32PM +0100, Arnd Bergmann wrote:

The default __UNIQUE_ID macro in compiler.h fails to work for some drivers:

drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:615:1: error: redefinition of
      '__UNIQUE_ID_firmware615'
BRCMF_FW_NVRAM_DEF(4354, "brcmfmac4354-sdio.bin", "brcmfmac4354-sdio.txt");

I applied the patch to kbuild.git#kbuild, but can you tell me with which
commit and config you get such failure. I only see a single
MODULE_FIRMWARE() call in the expansion of BRCMF_FW_NVRAM_DEF(), which
should work with line numbers as well. And I can't reproduce it with
today's linux-next. If there is some issue with code not yet in
linux-next, it needs to be worked around, because older GCCs did not
have __COUNTER__.

Michal