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build: add a config knob to enable gc-sections for all packages

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This enables the linker's garbage collection for all packages which haven't
opted-out.

Signed-off-by: Andre Heider <a.heider@gmail.com>
This commit is contained in:
Andre Heider 2023-02-03 13:15:43 +01:00 committed by Christian Marangi
parent 07730ff346
commit aef8bab9d7
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2 changed files with 9 additions and 1 deletions
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8
config/Config-build.in
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@ -144,6 +144,14 @@ menu "Global build settings"
help help
Adds -g3 to the CFLAGS. Adds -g3 to the CFLAGS.
config USE_GC_SECTIONS
bool
prompt "Dead code and data elimination for all packages (EXPERIMENTAL)"
help
Places functions and data items into its own sections to use the linker's
garbage collection capabilites.
Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-gc-sections
config IPV6 config IPV6
def_bool y def_bool y

2
include/package.mk
View File

@ -51,7 +51,7 @@ ifdef CONFIG_USE_MIPS16
TARGET_CXXFLAGS += -mips16 -minterlink-mips16 TARGET_CXXFLAGS += -mips16 -minterlink-mips16
endif endif
endif endif
ifeq ($(call pkg_build_flag,gc-sections,0),1) ifeq ($(call pkg_build_flag,gc-sections,$(if $(CONFIG_USE_GC_SECTIONS),1,0)),1)
TARGET_CFLAGS+= -ffunction-sections -fdata-sections TARGET_CFLAGS+= -ffunction-sections -fdata-sections
TARGET_CXXFLAGS+= -ffunction-sections -fdata-sections TARGET_CXXFLAGS+= -ffunction-sections -fdata-sections
TARGET_LDFLAGS+= -Wl,--gc-sections TARGET_LDFLAGS+= -Wl,--gc-sections