Add -fno-omit-frame-pointer to compile flags.

At some point between gcc 4.4 and 4.6, omitting the frame pointer became default if any -O is specified. getcallerpcs relies on the frame pointer, so bring it back.

Add -fno-omit-frame-pointer to compile flags.
97657d70 · Austin Clements · 96b7da5f · 97657d70
--- a/Makefile
+++ b/Makefile
@@ -71,7 +71,7 @@ AS = $(TOOLPREFIX)gas
 LD = $(TOOLPREFIX)ld
 OBJCOPY = $(TOOLPREFIX)objcopy
 OBJDUMP = $(TOOLPREFIX)objdump
-CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -O2 -Wall -MD -ggdb -m32 -Werror
+CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -O2 -Wall -MD -ggdb -m32 -Werror -fno-omit-frame-pointer
 CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
 ASFLAGS = -m32 -gdwarf-2
 # FreeBSD ld wants ``elf_i386_fbsd''