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authorAndre Heider <a.heider@gmail.com>2023-02-02 21:16:21 +0100
committerChristian Marangi <ansuelsmth@gmail.com>2023-03-21 18:28:22 +0100
commitda3700988d9e34e380bae21ee23d5458a7e972b4 (patch)
tree20d82e514ac77f4f0de8deb7f1274a8f409646df /include
parent5c545bdb365a78b8995ddfa441a6018f7ff3c011 (diff)
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treewide: add support for "gc-sections" in PKG_BUILD_FLAGS
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>
Diffstat (limited to 'include')
-rw-r--r--include/package.mk7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/package.mk b/include/package.mk
index a1717a603d..4d97cda00f 100644
--- a/include/package.mk
+++ b/include/package.mk
@@ -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