build: support linker flags/libs separation.

Our build system lumps all linker options together.  The
correct way is that linker flags are separated info flags and
libs. Also, we respond to the LDFLAGS variable but ignore
LDLIBS which is incorrect. Other issues are fixed.

All that is fixed here.

* Makefile (TXR_CFLAGS): Interpolate $(CFLAGS) last, so that
options coming from CFLAGS can override previous options.
(TXR_LDFLAGS): Interpolate $(LDFLAGS) last; same reason.
(TXR_LDLIBS): New variable.
(LINK_PROG): Put $(TXR_LDFLAGS) with the options, before
the -o, and put $(TXR_LDLIBS) at the end.

* configure (conf_ldlibs, platform_ldlibs): New variables.
(usage text): Document platform-ldlibs and adjust
documentation of platform-ldflags.
(gen_config_make): Generate PLATFORM_LDLIBS and CONF_LDLIBS
now needed by Makefile.
(mainline): Adjusts various recipes to use conf_ldlibs
instead of conf_ldflags, or in some cases both.
In the case of libffi where we use pkg-config, we use the
special pgk-config options to separately extract the
flags and libs. We use EXTRA_LDLIBS instead of EXTRA_LDFLAGS
in some conftest invocations, as necessary.

0 files changed, 0 insertions, 0 deletions