This patchset allows to build host programs that depend on external libs
installed in non standard locations (i.e. not in /usr/include, /usr/lib,
etc.). For now, the only way is to force HOSTCC to include both the
path to the host compiler and the build flags.
I have encountered this issue when building linux into the buildroot
framework. host-* versions of libs may be compiled and installed in a
host staging dir removing the need to install them on the build system.
I'm not really satisfied with the new HOST_{C,LD}FLAGS variables. They
are too similar to HOST{C,LD}FLAGS and I find them confusing. However,
HOST_EXTRA*FLAGS are already reserved for local use in makefiles (see
Documentation/kbuild/makefiles.txt). And I didn't want to have even
longer USER_HOST_*FLAGS. If someone has a better proposition, I'll
happily make a v3.
Comments are welcome.
Changes since v1:
- Fix typos.
- Do not use HOST_EXTRA*FLAGS. Add new user specifiable variables.
- Pass HOSTLDFLAGS to build single .c programs.
- Build objtool with host flags.
Robin Jarry (3):
kbuild: introduce HOST_{C,LD}FLAGS
kbuild: use HOSTLDFLAGS for single .c executables
objtool: use global host flags for compilation
Documentation/admin-guide/README.rst | 16 ++++++++++++++++
Makefile | 9 +++++----
scripts/Makefile.host | 2 +-
tools/objtool/Makefile | 4 ++--
4 files changed, 24 insertions(+), 7 deletions(-)
--
2.11.0
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