[LTP] [PATCH 2/2 v2] libs: Hook up libs into the build system

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> This hooks up libs/ subdirectories into the build system so that tests
> needs only specify which library from libs/ directory we should link
> againts. Which sets up the path to the library in LDFLAGS and also
> causes the library to be rebuild even when make is executed from the
> directory with testcases.
> 
> Now the test only needs to set up LTPLIBS variable with a list of
> optional libraries to link against and LDLIBS, since as far as I know we
> have to maintain the order of the libraries manually.

What if we added "libs" as dependency for all tests and always expanded
LDFLAGS for all libraries even if tests don't link against them?
Then we wouldn't need to specify "LTPLIBS". Just a thought.

I tested v2 as far back as RHEL6.2, ACK.

Regards,
Jan

> 
> Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
> CC: Jan Stancek <jstancek@redhat.com>
> CC: Petr Vorel <pvorel@suse.cz>
> ---
>  include/mk/testcases.mk                          | 16 +++++++++++++++-
>  testcases/kernel/syscalls/set_mempolicy/Makefile |  3 ++-
>  2 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/include/mk/testcases.mk b/include/mk/testcases.mk
> index bf97384a7..131854ec7 100644
> --- a/include/mk/testcases.mk
> +++ b/include/mk/testcases.mk
> @@ -41,5 +41,19 @@ INSTALL_DIR	:= testcases/bin
>  
>  LDLIBS		+= -lltp
>  
> -$(APICMDS_DIR) $(LIBLTP_DIR): %:
> +ifdef LTPLIBS
> +
> +LTPLIBS_DIRS = $(addprefix $(abs_top_builddir)/libs/lib, $(LTPLIBS))
> +LTPLIBS_FILES = $(addsuffix .a, $(addprefix $(abs_top_builddir)/libs/,
> $(foreach LIB,$(LTPLIBS),lib$(LIB)/lib$(LIB))))
> +
> +MAKE_DEPS += $(LTPLIBS_FILES)
> +
> +$(LTPLIBS_FILES): $(LTPLIBS_DIRS)
> +	$(MAKE) -C "$^" -f "$^/Makefile" all
> +
> +LDFLAGS += $(addprefix -L$(top_builddir)/libs/lib, $(LTPLIBS))
> +
> +endif
> +
> +$(LTPLIBS_DIRS) $(APICMDS_DIR) $(LIBLTP_DIR): %:
>  	mkdir -p "$@"
> diff --git a/testcases/kernel/syscalls/set_mempolicy/Makefile
> b/testcases/kernel/syscalls/set_mempolicy/Makefile
> index b79a53faf..a0b79d6e1 100644
> --- a/testcases/kernel/syscalls/set_mempolicy/Makefile
> +++ b/testcases/kernel/syscalls/set_mempolicy/Makefile
> @@ -1,8 +1,9 @@
>  top_srcdir		?= ../../../..
>  
> +LTPLIBS = ltpnuma
> +
>  include $(top_srcdir)/include/mk/testcases.mk
>  
> -LDFLAGS += -L$(top_builddir)/libs/libltpnuma
>  LDLIBS  += $(NUMA_LIBS) -lltpnuma
>  
>  include $(top_srcdir)/include/mk/generic_leaf_target.mk
> --
> 2.19.2
> 
>