build: Use -flto

Size difference:

	 wolfssl-util:     file format elf64-x86-64

	 Sections:
	 Idx Name          Size      VMA               LMA               File off  Algn
	   0 .interp       0000001c  0000000000000238  0000000000000238  00000238  2**0
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	   1 .note.ABI-tag 00000020  0000000000000254  0000000000000254  00000254  2**2
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	   2 .hash         00000158  0000000000000278  0000000000000278  00000278  2**3
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	   3 .dynsym       00000468  00000000000003d0  00000000000003d0  000003d0  2**3
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	   4 .dynstr       000002c6  0000000000000838  0000000000000838  00000838  2**0
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	   5 .gnu.version  0000005e  0000000000000afe  0000000000000afe  00000afe  2**1
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	   6 .gnu.version_r 00000030  0000000000000b60  0000000000000b60  00000b60  2**3
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	   7 .rela.dyn     00000420  0000000000000b90  0000000000000b90  00000b90  2**3
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	   8 .init         00000017  0000000000000fb0  0000000000000fb0  00000fb0  2**2
	                   CONTENTS, ALLOC, LOAD, READONLY, CODE
	   9 .plt          00000010  0000000000000fd0  0000000000000fd0  00000fd0  2**4
	                   CONTENTS, ALLOC, LOAD, READONLY, CODE
	  10 .plt.got      00000118  0000000000000fe0  0000000000000fe0  00000fe0  2**3
	                   CONTENTS, ALLOC, LOAD, READONLY, CODE
	- 11 .text         000007a2  0000000000001100  0000000000001100  00001100  2**4
	+ 11 .text         00000792  0000000000001100  0000000000001100  00001100  2**4
	                   CONTENTS, ALLOC, LOAD, READONLY, CODE
	- 12 .fini         00000009  00000000000018a4  00000000000018a4  000018a4  2**2
	+ 12 .fini         00000009  0000000000001894  0000000000001894  00001894  2**2
	                   CONTENTS, ALLOC, LOAD, READONLY, CODE
	- 13 .rodata       0000017e  00000000000018b0  00000000000018b0  000018b0  2**3
	+ 13 .rodata       0000017e  00000000000018a0  00000000000018a0  000018a0  2**3
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	- 14 .eh_frame_hdr 00000034  0000000000001a30  0000000000001a30  00001a30  2**2
	+ 14 .eh_frame_hdr 00000034  0000000000001a20  0000000000001a20  00001a20  2**2
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	- 15 .eh_frame     000000ec  0000000000001a68  0000000000001a68  00001a68  2**3
	+ 15 .eh_frame     000000ec  0000000000001a58  0000000000001a58  00001a58  2**3
	                   CONTENTS, ALLOC, LOAD, READONLY, DATA
	  16 .init_array   00000008  0000000000201cc0  0000000000201cc0  00001cc0  2**3
	                   CONTENTS, ALLOC, LOAD, DATA
	  17 .fini_array   00000008  0000000000201cc8  0000000000201cc8  00001cc8  2**3
	                   CONTENTS, ALLOC, LOAD, DATA
	  18 .jcr          00000008  0000000000201cd0  0000000000201cd0  00001cd0  2**3
	                   CONTENTS, ALLOC, LOAD, DATA
	  19 .dynamic      000001d0  0000000000201cd8  0000000000201cd8  00001cd8  2**3
	                   CONTENTS, ALLOC, LOAD, DATA
	  20 .got          00000158  0000000000201ea8  0000000000201ea8  00001ea8  2**3
	                   CONTENTS, ALLOC, LOAD, DATA
	  21 .data         00000008  0000000000202000  0000000000202000  00002000  2**3
	                   CONTENTS, ALLOC, LOAD, DATA
	  22 .bss          00000010  0000000000202020  0000000000202020  00002008  2**5
	                   ALLOC
	  23 .comment      00000026  0000000000000000  0000000000000000  00002008  2**0
	                   CONTENTS, READONLY

1 files changed, 1 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index 2b9aee6..db6f0cf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,7 +90,7 @@ AX_APPEND_FLAG([-DECC_TIMING_RESISTANT])
 
 for flag in -Os -s -fno-unwind-tables -fno-asynchronous-unwind-tables \
 		-ffunction-sections -fdata-sections -Wl,--gc-sections \
-		-fstack-protector-strong \
+		-fstack-protector-strong -flto \
 		-Wl,-z,now -Wl,--hash-style=sysv -Wl,--build-id=none; do
 	AX_CHECK_COMPILE_FLAG([${flag}], [AX_APPEND_FLAG([${flag}])])
 done