[ovs-dev] [PATCH 3/3] command-line: add ovs_cmdl_context

[Ben Pfaff]

On Tue, Mar 17, 2015 at 11:31:17AM -0400, Russell Bryant wrote:
> On 03/17/2015 11:11 AM, Ben Pfaff wrote:
> With just -Werror, I get:
> 
> libtool: compile:  clang -DHAVE_CONFIG_H -I. -I ./include -I ./include
> -I ./lib -I ./lib -Wstrict-prototypes -Wall -Wextra -Wno-sign-compare
> -Wpointer-arith -Wformat-security -Wno-format-zero-length -Wswitch-enum
> -Wunused-parameter -Wbad-function-cast -Wcast-align -Wstrict-prototypes
> -Wold-style-definition -Wmissing-prototypes -Wmissing-field-initializers
> -Wthread-safety -fno-strict-aliasing -Werror -MT lib/aes128.lo -MD -MP
> -MF lib/.deps/aes128.Tpo -c lib/aes128.c -o lib/aes128.o
> clang: error: argument unused during compilation: '-I .'
> clang: error: argument unused during compilation: '-I ./include'
> clang: error: argument unused during compilation: '-I ./include'
> clang: error: argument unused during compilation: '-I ./lib'
> clang: error: argument unused during compilation: '-I ./lib'
> Makefile:3454: recipe for target 'lib/aes128.lo' failed

It's bizarre to report -I options as "argument[s] unused during
compilation" so I typed this into Google and found
https://github.com/perl11/potion/issues/41, which says (in part):

    It's because ccache is not yet fully clang-compatible, and it
    produces this warning, ...

Any chance that ccache is enabled and interfering somehow with the clang
build?  Maybe it should be disabled for clang.