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

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/787de4331f0b01da114f16fcfaea5ecdfc010310

commit 787de4331f0b01da114f16fcfaea5ecdfc010310
Author: Hauke Mehrtens <hauke at hauke-m.de>
AuthorDate: Tue Sep 1 14:50:52 2020 +0200

    wolfssl: Activate link time optimization (LTO)
    
    The ipk sizes for mips_24Kc change like this:
    old:
    libwolfssl24_4.5.0-stable-1_mips_24kc.ipk       391.545
    
    new:
    libwolfssl24_4.5.0-stable-2_mips_24kc.ipk       387.439
    
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 package/libs/wolfssl/Makefile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/package/libs/wolfssl/Makefile b/package/libs/wolfssl/Makefile
index 1fcca9fc5f..dc8ca2b262 100644
--- a/package/libs/wolfssl/Makefile
+++ b/package/libs/wolfssl/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=wolfssl
 PKG_VERSION:=4.5.0-stable
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/wolfSSL/wolfssl/archive/v$(PKG_VERSION)
@@ -56,7 +56,8 @@ define Package/libwolfssl/config
 	source "$(SOURCE)/Config.in"
 endef
 
-TARGET_CFLAGS += $(FPIC) -DFP_MAX_BITS=8192 -fomit-frame-pointer
+TARGET_CFLAGS += $(FPIC) -DFP_MAX_BITS=8192 -fomit-frame-pointer -flto
+TARGET_LDFLAGS += -flto
 
 # --enable-stunnel needed for OpenSSL API compatibility bits
 CONFIGURE_ARGS += \