On Mon, Jun 09, 2014 at 08:02:24PM -0400, Jeff King wrote:

> I'm still confused and disturbed that my gcc is not noticing this
> obvious const violation. Hmm, shutting off ccache seems to make it work.
> Doubly disturbing.

Ah, mystery solved. It's a gcc bug:


I get:

  $ gcc -c -Wall -Werror -DSHA1_HEADER='"block-sha1/sha1.h"' notes-merge.c
  notes-merge.c: In function ‘notes_merge_commit’:
  notes-merge.c:723:2: error: passing argument 2 of ‘strbuf_attach’
    discards ‘const’ qualifier from pointer target type [-Werror]

  $ gcc -E -Wall -Werror -DSHA1_HEADER='"block-sha1/sha1.h"' notes-merge.c 
  $ gcc -c -Wall -Werror -DSHA1_HEADER='"block-sha1/sha1.h"' foo.c
  [no warnings from either]

ccache uses the latter technique.

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