domenico/openwrt-R7800-nss
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treewide: add support for "lto" in PKG_BUILD_FLAGS

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This reduces open coding and allows to easily add a knob to enable
it treewide, where chosen packages can still opt-out via "no-lto".

Some packages used LTO, but not the linker plugin. This unifies 'em
all to attempt to produce better code.
Quoting man gcc(1):
"This improves the quality of optimization by exposing more code to the
link-time optimizer."

Also use -flto=auto instead of -flto=jobserver, as it's not guaranteed
that every buildsystem uses +$(MAKE) correctly.

Signed-off-by: Andre Heider <a.heider@gmail.com>
This commit is contained in:
Andre Heider
2023-02-02 21:33:38 +01:00
committed by Christian Marangi
parent da3700988d
commit 07730ff346
23 changed files with 46 additions and 67 deletions
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7
include/package.mk
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@@ -30,7 +30,7 @@ ifneq ($(strip $(PKG_USE_MIPS16)),1)
PKG_BUILD_FLAGS+=no-mips16
endif
__unknown_flags=$(filter-out no-iremap no-mips16 gc-sections no-gc-sections,$(PKG_BUILD_FLAGS))
__unknown_flags=$(filter-out no-iremap no-mips16 gc-sections no-gc-sections lto no-lto,$(PKG_BUILD_FLAGS))
ifneq ($(__unknown_flags),)
$(error unknown PKG_BUILD_FLAGS: $(__unknown_flags))
endif
@@ -56,6 +56,11 @@ ifeq ($(call pkg_build_flag,gc-sections,0),1)
TARGET_CXXFLAGS+= -ffunction-sections -fdata-sections
TARGET_LDFLAGS+= -Wl,--gc-sections
endif
ifeq ($(call pkg_build_flag,lto,0),1)
TARGET_CFLAGS+= -flto=auto -fno-fat-lto-objects
TARGET_CXXFLAGS+= -flto=auto -fno-fat-lto-objects
TARGET_LDFLAGS+= -flto=auto -fuse-linker-plugin
endif
include $(INCLUDE_DIR)/hardening.mk
include $(INCLUDE_DIR)/prereq.mk