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treewide: add support for "gc-sections" 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-gc-sections".

Note: libnl, mbedtls and opkg only used the CFLAGS part without the
LDFLAGS counterpart. That doesn't help at all if the goal is to produce
smaller binaries. I consider that an accident, and this fixes it.

Note: there are also packages using only the LDFLAGS part. I didn't
touch those, as gc might have been disabled via CFLAGS intentionally.

Signed-off-by: Andre Heider <a.heider@gmail.com>
This commit is contained in:
Andre Heider
2023-02-02 21:16:21 +01:00
committed by Christian Marangi
parent 5c545bdb36
commit da3700988d
20 changed files with 51 additions and 48 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,$(PKG_BUILD_FLAGS))
__unknown_flags=$(filter-out no-iremap no-mips16 gc-sections no-gc-sections,$(PKG_BUILD_FLAGS))
ifneq ($(__unknown_flags),)
$(error unknown PKG_BUILD_FLAGS: $(__unknown_flags))
endif
@@ -51,6 +51,11 @@ ifdef CONFIG_USE_MIPS16
TARGET_CXXFLAGS += -mips16 -minterlink-mips16
endif
endif
ifeq ($(call pkg_build_flag,gc-sections,0),1)
TARGET_CFLAGS+= -ffunction-sections -fdata-sections
TARGET_CXXFLAGS+= -ffunction-sections -fdata-sections
TARGET_LDFLAGS+= -Wl,--gc-sections
endif
include $(INCLUDE_DIR)/hardening.mk
include $(INCLUDE_DIR)/prereq.mk