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tools: add options to optimize host binaries 

Mains goals are:
- reduce binary size of host tools;
- reduce i/o load on build host;
- increase performance of host tools being built.

Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/18659
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
This commit is contained in:
Konstantin Demin 2025-05-02 23:47:01 +03:00 committed by Christian Marangi
parent faef19c22c
commit e8b470139c
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GPG Key ID: AC001D09ADBFEAD7
2 changed files with 65 additions and 4 deletions
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54
config/Config-devel.in
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@ -62,6 +62,60 @@ menuconfig DEVEL
Compile all host host tools even if not needed. This is needed to prepare a
universal precompiled host tools archive to use in another buildroot.
menuconfig OPTIMIZE_HOST_TOOLS
bool "Host Tools compile options" if DEVEL
if OPTIMIZE_HOST_TOOLS
config HOST_FLAGS_OPT
string "Host Tools optimization flags"
default "-O2"
help
Compiler flags which are used to build host tools.
E.g.: "-O2", "-O3 -fno-tree-vectorize".
Default is "-O2".
config HOST_TOOLS_STRIP
bool "Strip Host Tools"
help
Instructs compiler/linker to use flags from HOST_FLAGS_STRIP
in order to reduce binary size of host tools.
config HOST_FLAGS_STRIP
string "Host Tools compiler/linker flags for stripping symbols"
depends on HOST_TOOLS_STRIP
default "-Wl,-s"
help
Compiler flags which are used to strip symbols from host tools.
Each flag should be prefixed with "-Wl," string
because compiler (GCC) passes this value to linker.
Default is "-Wl,-s" which means "strip all symbols" - specifically,
debug symbols and other symbols not needed for relocation processing.
comment "Host Tools miscellaneous flags"
config HOST_EXTRA_CFLAGS
string "Host Tools extra CFLAGS"
default ""
config HOST_EXTRA_CXXFLAGS
string "Host Tools extra CXXFLAGS"
default ""
config HOST_EXTRA_CPPFLAGS
string "Host Tools extra CPPFLAGS"
default ""
config HOST_EXTRA_LDFLAGS
string "Host Tools extra LDFLAGS"
default ""
endif
config BUILD_SUFFIX
string "Build suffix to append to the target BUILD_DIR variable" if DEVEL
default ""

15
rules.mk
View File

@ -278,12 +278,19 @@ PKG_CONFIG:=$(STAGING_DIR_HOST)/bin/pkg-config
export PKG_CONFIG
HOST_FLAGS_OPT:=$(call qstrip,$(CONFIG_HOST_FLAGS_OPT))
HOST_FLAGS_STRIP:=$(call qstrip,$(CONFIG_HOST_FLAGS_STRIP))
HOST_EXTRA_CFLAGS:=$(call qstrip,$(CONFIG_HOST_EXTRA_CFLAGS))
HOST_EXTRA_CXXFLAGS:=$(call qstrip,$(CONFIG_HOST_EXTRA_CXXFLAGS))
HOST_EXTRA_CPPFLAGS:=$(call qstrip,$(CONFIG_HOST_EXTRA_CPPFLAGS))
HOST_EXTRA_LDFLAGS:=$(call qstrip,$(CONFIG_HOST_EXTRA_LDFLAGS))
HOSTCC:=$(STAGING_DIR_HOST)/bin/gcc
HOSTCXX:=$(STAGING_DIR_HOST)/bin/g++
HOST_CPPFLAGS:=-I$(STAGING_DIR_HOST)/include $(if $(IS_PACKAGE_BUILD),-I$(STAGING_DIR_HOSTPKG)/include -I$(STAGING_DIR)/host/include)
HOST_CFLAGS:=-O2 $(HOST_CPPFLAGS)
HOST_CXXFLAGS:=$(HOST_CFLAGS)
HOST_LDFLAGS:=-L$(STAGING_DIR_HOST)/lib $(if $(IS_PACKAGE_BUILD),-L$(STAGING_DIR_HOSTPKG)/lib -L$(STAGING_DIR)/host/lib)
HOST_CPPFLAGS:=$(strip -I$(STAGING_DIR_HOST)/include $(if $(IS_PACKAGE_BUILD),-I$(STAGING_DIR_HOSTPKG)/include -I$(STAGING_DIR)/host/include) $(HOST_EXTRA_CPPFLAGS))
HOST_CFLAGS:=$(strip $(HOST_FLAGS_OPT) $(HOST_EXTRA_CFLAGS) $(HOST_CPPFLAGS) $(HOST_FLAGS_STRIP))
HOST_CXXFLAGS:=$(strip $(HOST_CFLAGS) $(HOST_EXTRA_CXXFLAGS))
HOST_LDFLAGS:=$(strip -L$(STAGING_DIR_HOST)/lib $(if $(IS_PACKAGE_BUILD),-L$(STAGING_DIR_HOSTPKG)/lib -L$(STAGING_DIR)/host/lib) $(HOST_EXTRA_LDFLAGS) $(HOST_FLAGS_STRIP))
BUILD_KEY=$(TOPDIR)/key-build
BUILD_KEY_APK_SEC=$(TOPDIR)/private-key.pem