build: Default to -O2 optimisation instead of -O3
diff --git a/configure.ac b/configure.ac
index 4dabac34..08e98880 100644
--- a/configure.ac
+++ b/configure.ac
@@ -185,7 +185,7 @@ AC_ARG_VAR(CROSS_OBJCOPY, [objcopy command for Limine])
AC_ARG_VAR(CROSS_OBJDUMP, [objdump command for Limine])
AC_ARG_VAR(CROSS_READELF, [readelf command for Limine])
-m4_define([DEFAULT_CROSS_CFLAGS], [-O3 -pipe -Wall -Wextra])
+m4_define([DEFAULT_CROSS_CFLAGS], [-g -O2 -pipe -Wall -Wextra])
AC_ARG_VAR(CROSS_CFLAGS, [C flags for Limine @<:@default: ]DEFAULT_CROSS_CFLAGS[@:>@])
test "x$CROSS_CFLAGS" = "x" && CROSS_CFLAGS="DEFAULT_CROSS_CFLAGS"
