linux-kernel - linux-next: build failure after merge of the compiler-attributes tree

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Message-ID: <20190830085227.01676c93@canb.auug.org.au>
Date:   Fri, 30 Aug 2019 08:52:27 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Sedat Dilek <sedat.dilek@...il.com>
Subject: linux-next: build failure after merge of the compiler-attributes
 tree

Hi all,

After merging the compiler-attributes tree, today's linux-next build
(powerpc ppc64_defconfig) failed like this:

arch/powerpc/boot/main.c:153:45: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__section'
  153 | static char cmdline[BOOT_COMMAND_LINE_SIZE] __section(__builtin_cmdline);
      |                                             ^~~~~~~~~
arch/powerpc/boot/main.c: In function 'prep_cmdline':
arch/powerpc/boot/main.c:166:6: error: 'cmdline' undeclared (first use in this function)
  166 |  if (cmdline[0] == '\0')
      |      ^~~~~~~
arch/powerpc/boot/main.c:166:6: note: each undeclared identifier is reported only once for each function it appears in
arch/powerpc/boot/main.c: In function 'start':
arch/powerpc/boot/main.c:196:40: error: 'cmdline' undeclared (first use in this function)
  196 |  if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
      |                                        ^~~~~~~

Caused by commit

  e81c903fb9e2 ("powerpc: prefer __section and __printf from compiler_attributes.h")

I have reverted that commit for today.

gcc v9.2.1 (in case that matters)

The above error is from the PowerPC boot wrapper that is built without
the kernel headers (mainly, I think).

-- 
Cheers,
Stephen Rothwell

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