build: update c client to v6.6.0 (#91)

Makefile

@@ -59,14 +59,14 @@ DYNAMIC_OPTIONS =
 
 CC ?= cc
 
-DWARF := $(shell $(CC) -Wall -Wextra -O2 -o /tmp/asflags_$${$$} src/flags.c; \
+DWARF := $(shell $(CC) -Wall -Wextra -O0 -g -o /tmp/asflags_$${$$} src/flags.c; \
 		/tmp/asflags_$${$$}; rm /tmp/asflags_$${$$})
-CFLAGS += -std=gnu11 $(DWARF) -O2 -fno-common -fno-strict-aliasing \
+CFLAGS += -std=gnu11 $(DWARF) -O0 -g -fno-common -fno-strict-aliasing \
 		-Wall -Wextra -Wconversion -Wsign-conversion -Wmissing-declarations \
 		-Wno-implicit-fallthrough -Wno-unused-result -Wno-typedef-redefinition \
 		-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2 -DMARCH_$(ARCH) \
 		-DTOOL_VERSION=\"$(VERSION)\"
-CXXFLAGS := -std=c++14 $(DWARF) -O2 -fno-common -fno-strict-aliasing \
+CXXFLAGS := -std=c++14 $(DWARF) -O0 -g -fno-common -fno-strict-aliasing \
 		-Wall -Wextra -Wconversion -Wsign-conversion -Wmissing-declarations \
 		-Wno-implicit-fallthrough -Wno-unused-result \
 		-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2 -DMARCH_$(ARCH) \