Compiling with clang 3.7: breaks in 'external/libwpd'

[Stephan Bergmann]

On 10/10/2015 11:42 AM, Giuseppe Castagno wrote:
> Making all in lib
>    CXX      libwpd_internal.lo
> clang: error: argument unused during compilation: '-I .'
> clang: error: argument unused during compilation: '-I ../..'
> clang: error: argument unused during compilation: '-I ../../inc'
> clang: error: argument unused during compilation: '-I
> /srv5/git/LO/lo-clang-test/workdir/UnpackedTarball/librevenge/inc'
> Makefile:1042: recipe for target 'libwpd_internal.lo' failed
> make[5]: *** [libwpd_internal.lo] Error 1
> Makefile:366: recipe for target 'all-recursive' failed
> make[4]: *** [all-recursive] Error 1
> Makefile:478: recipe for target 'all-recursive' failed
> make[3]: *** [all-recursive] Error 1
> Makefile:388: recipe for target 'all' failed
> make[2]: *** [all] Error 2
> /srv5/git/LO/lo-clang-test/external/libwpd/ExternalProject_libwpd.mk:23:
> recipe for target
> '/srv5/git/LO/lo-clang-test/workdir/ExternalProject/libwpd/build' failed
> make[1]: ***
> [/srv5/git/LO/lo-clang-test/workdir/ExternalProject/libwpd/build] Error 1
> Makefile:103: recipe for target 'libwpd' failed
> make: *** [libwpd] Error 2

Smells like compile-step specific -I switches are passed into a compiler 
invocation that ultimately just causes a link-step.  I'd try to get 
better information about what commands are actually invoked by the build 
(something like "make libwpd verbose=1") and figure out from there 
(might be an autotools issue?; building libwpd involves the dreaded 
libtool AFAIK).  I cannot reproduce here (Fedora 22, recent Clang trunk 
build).