Force signed char compiler setting

Author: maccasoft

kernel/common.mk

@@ -11,7 +11,7 @@ OBJCOPY := $(TOOLCHAIN)-objcopy
 DEPDIR := .deps
 
 ASFLAGS = --warn -mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=softfp
-CFLAGS = -Wall -O2 -ffreestanding -marm -mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=softfp -D__RASPBERRY_PI__ -I../kernel -I../uspi/include
+CFLAGS = -Wall -O2 -ffreestanding -marm -mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=softfp -fsigned-char -D__RASPBERRY_PI__ -I../kernel -I../uspi/include
 CPPFLAGS = $(CFLAGS) -fno-exceptions -fno-unwind-tables -fno-rtti
 LDFLAGS = -T ../kernel/raspberry.ld -nostartfiles -fno-exceptions -fno-unwind-tables -fno-rtti -Wl,-Map=kernel.map -o kernel.elf
 

uspi/Makefile

@@ -30,7 +30,7 @@ OBJCOPY := $(TOOLCHAIN)objcopy
 DEPDIR := .deps
 
 ASFLAGS = --warn -mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=softfp
-CFLAGS = -Wall -O2 -ffreestanding -marm -mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=softfp -Iinclude -DNDEBUG
+CFLAGS = -Wall -O2 -ffreestanding -marm -mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=softfp -fsigned-char -Iinclude -DNDEBUG
 CPPFLAGS = $(CFLAGS) -fno-exceptions -fno-unwind-tables -fno-rtti
 
 all: libuspi.a