linux-kernel - Re: [PATCH -next] iwlwifi: dbg: work around clang bug by marking debug strings static

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Date:   Thu, 01 Aug 2019 11:21:01 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nick Desaulniers <ndesaulniers@...gle.com>, kvalo@...eaurora.org,
        Luca Coelho <luciano.coelho@...el.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Shahar S Matityahu <shahar.s.matityahu@...el.com>,
        Sara Sharon <sara.sharon@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH -next] iwlwifi: dbg: work around clang bug by marking debug strings static

Nick Desaulniers <ndesaulniers@...gle.com> writes:
> Commit r353569 in prerelease Clang-9 is producing a linkage failure:
>
> ld: drivers/net/wireless/intel/iwlwifi/fw/dbg.o:
> in function `_iwl_fw_dbg_apply_point':
> dbg.c:(.text+0x827a): undefined reference to `__compiletime_assert_2387'

This breakage is also seen in older GCC versions (v4.6.3 at least):

  drivers/net/wireless/intel/iwlwifi/fw/dbg.c: In function 'iwl_fw_dbg_info_apply.isra.10':
  drivers/net/wireless/intel/iwlwifi/fw/dbg.c:2445:3: error: call to '__compiletime_assert_2446' declared with attribute error: BUILD_BUG_ON failed: err_str[sizeof(err_str) - 2] != '\n'
  drivers/net/wireless/intel/iwlwifi/fw/dbg.c:2451:3: error: call to '__compiletime_assert_2452' declared with attribute error: BUILD_BUG_ON failed: err_str[sizeof(err_str) - 2] != '\n'
  drivers/net/wireless/intel/iwlwifi/fw/dbg.c: In function '_iwl_fw_dbg_apply_point':
  drivers/net/wireless/intel/iwlwifi/fw/dbg.c:2789:5: error: call to '__compiletime_assert_2790' declared with attribute error: BUILD_BUG_ON failed: invalid_ap_str[sizeof(invalid_ap_str) - 2] != '\n'
  drivers/net/wireless/intel/iwlwifi/fw/dbg.c:2800:5: error: call to '__compiletime_assert_2801' declared with attribute error: BUILD_BUG_ON failed: invalid_ap_str[sizeof(invalid_ap_str) - 2] != '\n'
 
  http://kisskb.ellerman.id.au/kisskb/buildresult/13902155/


Luca, you said this was already fixed in your internal tree, and the fix
would appear soon in next, but I don't see anything in linux-next?

cheers