This patch series adds an option to make use of link time optimization
(if compiler has support for it). It is split as follows:
- 1st patch (build) is the enablement
- remaining patches are fixes for the warnings produced by the compiler
and they are split by directory/subsystem so their maintainers can
easily find and verify the changes - please note that there are two
groups:
* errors (or possible errors) - with title "fix possible use ..."
* false positives - warnings that _I_ think are not valid and the
changes are made only to silence the compiler.
v4 Changes:
-----------
- merge nested conditionals in config/meson.build into one
v3 Changes:
-----------
- removed support for clang (only gcc and icc remain):
- it turned out that 'fat-lto-objects' is not really supported - it is
accepted as a flag but ignored e.g. clang v6.0:
clang: error: optimization flag '-ffat-lto-objects' is not supported
[-Werror,-Wignored-optimization-argument]
this was probably masked previously by playing around with meson and
testing for the availability of this flag and dropping LTO if not
supported.
- improved commit messages:
- added 'Fixes' tags where appropriate
- included snippets of compiler warnings
- changed commit names for the commits cleaning up 'false positive'
compiler warnings - these are not really 'fixes' for the code, just
workarounds for compiler shortcomings and check-git-log.sh was
complaining about missing 'Fixes' tag.
v2 Changes:
-----------
- fixed building of shared libraries:
- gcc does not scan top level assembler statements so it missed that
function implementations for specific versions were being used and
was removing them
- fixed meson.build config files:
- moved from 'enable_lto' project option to built-in 'b_lto'
- documented that 'default_library' should be 'shared':
with 'default_library=static' (the default) the meson build with LTO
is broken - this is because, SHARED_LIB is fixed in rte_config.h
used by meson which leads to no alias for default version in
generated static libraries (MAP_STATIC_SYMBOL() is empty)
- app/test: added log for failed bonding "config get"
Andrzej Ostruszka (10):
build: add an option to enable LTO build
eventdev: fix possible use of uninitialized var
app/eventdev: clean LTO build warnings (maybe-uninitialized)
event/octeontx2: clean LTO build warnings (maybe-uninitialized)
app/test: clean LTO build warnings (maybe-uninitialized)
net/dpaa2: fix possible use of uninitialized vars
net/e1000: clean LTO build warnings (maybe-uninitialized)
net/i40e: clean LTO build warnings (maybe-uninitialized)
net/ifc: clean LTO build warnings (maybe-uninitialized)
net/qede: clean LTO build warnings (maybe-uninitialized)
.travis.yml | 7 ++++
app/test-eventdev/test_perf_common.c | 2 +-
app/test-eventdev/test_pipeline_common.c | 4 +--
app/test/test_hash_readwrite.c | 2 +-
app/test/test_link_bonding_mode4.c | 10 ++++--
app/test/test_memzone.c | 3 +-
config/common_base | 5 +++
config/meson.build | 13 +++++++
doc/guides/prog_guide/lto.rst | 36 +++++++++++++++++++
doc/guides/rel_notes/release_19_11.rst | 8 +++++
drivers/event/octeontx2/otx2_tim_worker.h | 2 +-
drivers/net/dpaa2/base/dpaa2_hw_dpni.c | 1 +
drivers/net/dpaa2/mc/dpkg.c | 2 +-
drivers/net/dpaa2/mc/dpni.c | 9 +++--
drivers/net/e1000/base/e1000_82543.c | 2 +-
drivers/net/e1000/base/e1000_ich8lan.c | 2 +-
drivers/net/e1000/base/e1000_phy.c | 2 +-
drivers/net/i40e/i40e_ethdev.c | 2 +-
drivers/net/ifc/ifcvf_vdpa.c | 14 +++++---
drivers/net/qede/base/ecore_mcp.c | 13 +++----
lib/librte_distributor/rte_distributor.c | 18 +++++-----
lib/librte_distributor/rte_distributor_v20.c | 18 +++++-----
lib/librte_eventdev/rte_event_timer_adapter.c | 8 ++---
lib/librte_lpm/rte_lpm.c | 28 +++++++--------
lib/librte_lpm/rte_lpm6.c | 16 ++++-----
lib/librte_timer/rte_timer.c | 20 +++++------
mk/toolchain/gcc/rte.toolchain-compat.mk | 4 +++
mk/toolchain/gcc/rte.vars.mk | 12 +++++++
mk/toolchain/icc/rte.vars.mk | 8 +++++
29 files changed, 190 insertions(+), 81 deletions(-)
create mode 100644 doc/guides/prog_guide/lto.rst
--
2.17.1
