[openwrt/openwrt] jansson: Activate link time optimization (LTO)

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/a617861d4c3959d8f3e026128c21da1e7c5f73a5

commit a617861d4c3959d8f3e026128c21da1e7c5f73a5
Author: Hauke Mehrtens <hauke at hauke-m.de>
AuthorDate: Tue Sep 1 14:02:47 2020 +0200

    jansson: Activate link time optimization (LTO)
    
    The ipk sizes for mips_24Kc change like this:
    old:
    jansson4_2.13.1-1_mips_24kc.ipk 19.171
    
    new:
    jansson4_2.13.1-2_mips_24kc.ipk 18.936
    
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 package/libs/jansson/Makefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/package/libs/jansson/Makefile b/package/libs/jansson/Makefile
index 247be3401b..5799a362dd 100644
--- a/package/libs/jansson/Makefile
+++ b/package/libs/jansson/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=jansson
 PKG_VERSION:=2.13.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=LICENSE
 
@@ -39,6 +39,9 @@ define Package/jansson/description
   Jansson is a C library for encoding, decoding and manipulating JSON data
 endef
 
+TARGET_CFLAGS += -flto
+TARGET_LDFLAGS += -flto
+
 define Package/jansson/install
 	$(INSTALL_DIR) $(1)/usr/lib
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libjansson*so* $(1)/usr/lib/