diff --git a/arch/8051/include/types.h b/arch/8051/include/types.h
index 7495513b2cb..2d195631a1e 100644
--- a/arch/8051/include/types.h
+++ b/arch/8051/include/types.h
@@ -67,20 +67,20 @@
  * long long and double are not supported.
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef int                _int16_t;
+typedef signed int         _int16_t;
 typedef unsigned int       _uint16_t;
 
-typedef long               _int32_t;
+typedef signed long        _int32_t;
 typedef unsigned long      _uint32_t;
 
 /* For SDCC, a Generic pointer is 3 bytes in length with the
  * first byte holding data space information.
  */
 
-typedef long               _intptr_t;
+typedef signed long        _intptr_t;
 typedef unsigned long      _uintptr_t;
 
 /* This is the size of the interrupt state save returned by
diff --git a/arch/arm/include/types.h b/arch/arm/include/types.h
index 9a45fcb7544..c3471ca59b5 100644
--- a/arch/arm/include/types.h
+++ b/arch/arm/include/types.h
@@ -63,22 +63,22 @@
  * files
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
-typedef int                _int32_t;
+typedef signed int         _int32_t;
 typedef unsigned int       _uint32_t;
 
-typedef long long          _int64_t;
+typedef signed long long   _int64_t;
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
 /* A pointer is 4 bytes */
 
-typedef int                _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
 /* This is the size of the interrupt state save returned by irqsave().  For
@@ -87,9 +87,9 @@ typedef unsigned int       _uintptr_t;
  */
 
 #ifdef __thumb2__
-typedef unsigned short irqstate_t;
+typedef unsigned short     irqstate_t;
 #else /* __thumb2__ */
-typedef unsigned int irqstate_t;
+typedef unsigned int       irqstate_t;
 #endif /* __thumb2__ */
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/avr/include/types.h b/arch/avr/include/types.h
index fd8c394c41d..c93e70df4ca 100644
--- a/arch/avr/include/types.h
+++ b/arch/avr/include/types.h
@@ -63,27 +63,27 @@
  * files
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
-typedef int                _int32_t;
+typedef signed int         _int32_t;
 typedef unsigned int       _uint32_t;
 
-typedef long long          _int64_t;
+typedef signed long long   _int64_t;
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
 /* A pointer is 4 bytes */
 
-typedef int                _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
 /* This is the size of the interrupt state save returned by irqsave(). */
 
-typedef unsigned int irqstate_t;
+typedef unsigned int       irqstate_t;
 
 #endif /* __ASSEMBLY__ */
 
diff --git a/arch/hc/include/hc12/types.h b/arch/hc/include/hc12/types.h
index f29be63940b..d676e3d27a9 100755
--- a/arch/hc/include/hc12/types.h
+++ b/arch/hc/include/hc12/types.h
@@ -63,9 +63,9 @@
  * files
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
 /* Normally, mc68hc1x code is compiled with the -mshort option
@@ -74,20 +74,20 @@ typedef unsigned short     _uint16_t;
  */
 
 # if __INT__ == 16
-typedef long               _int32_t;
+typedef signed long        _int32_t;
 typedef unsigned long      _uint32_t;
 #else
-typedef int                _int32_t;
+typedef signed int         _int32_t;
 typedef unsigned int       _uint32_t;
 #endif
 
-typedef long long          _int64_t;
+typedef signed long long   _int64_t;
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
 /* A pointer is two bytes */
 
-typedef short              _intptr_t;
+typedef signed short       _intptr_t;
 typedef unsigned short     _uintptr_t;
 
 /* This is the size of the interrupt state save returned by irqsave()*/
diff --git a/arch/hc/include/hcs12/types.h b/arch/hc/include/hcs12/types.h
index 71b311fb793..739ddef2157 100755
--- a/arch/hc/include/hcs12/types.h
+++ b/arch/hc/include/hcs12/types.h
@@ -63,10 +63,10 @@
  * files
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
 /* Normally, mc68hc1x code is compiled with the -mshort option
@@ -75,20 +75,20 @@ typedef unsigned short     _uint16_t;
  */
 
 # if __INT__ == 16
-typedef long               _int32_t;
+typedef signed long        _int32_t;
 typedef unsigned long      _uint32_t;
 #else
-typedef int                _int32_t;
+typedef signed int         _int32_t;
 typedef unsigned int       _uint32_t;
 #endif
 
-typedef long long          _int64_t;
+typedef signed long long   _int64_t;
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
 /* A pointer is two bytes */
 
-typedef short              _intptr_t;
+typedef signed short       _intptr_t;
 typedef unsigned short     _uintptr_t;
 
 /* This is the size of the interrupt state save returned by irqsave()*/
diff --git a/arch/sh/include/m16c/types.h b/arch/sh/include/m16c/types.h
index d1481286001..4f84a311327 100644
--- a/arch/sh/include/m16c/types.h
+++ b/arch/sh/include/m16c/types.h
@@ -65,22 +65,22 @@
  * int is 16-bits and long is 32-bits 
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef int                _int16_t;
+typedef signed int         _int16_t;
 typedef unsigned int       _uint16_t;
 
-typedef long               _int32_t;
+typedef signed long        _int32_t;
 typedef unsigned long      _uint32_t;
 
-typedef long long          _int64_t;
+typedef signed long long   _int64_t;
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
 /* A pointer is 2 bytes */
 
-typedef unsigned int       _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
 /* This is the size of the interrupt state save returned by
diff --git a/arch/sh/include/sh1/types.h b/arch/sh/include/sh1/types.h
index 79ed1a18193..ac0769ecd50 100644
--- a/arch/sh/include/sh1/types.h
+++ b/arch/sh/include/sh1/types.h
@@ -63,22 +63,22 @@
  * files
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
-typedef int                _int32_t;
+typedef signed int         _int32_t;
 typedef unsigned int       _uint32_t;
 
-typedef long long          _int64_t;
+typedef signed long long   _int64_t;
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
 /* A pointer is 4 bytes */
 
-typedef int                _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
 /* This is the size of the interrupt state save returned by
diff --git a/arch/sim/include/types.h b/arch/sim/include/types.h
index 214fbb91b97..5b58264e6cd 100644
--- a/arch/sim/include/types.h
+++ b/arch/sim/include/types.h
@@ -63,22 +63,22 @@
  * files
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
-typedef int                _int32_t;
+typedef signed int         _int32_t;
 typedef unsigned int       _uint32_t;
 
-typedef long long          _int64_t;
+typedef signed long long   _int64_t;
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
 /* A pointer is 4 bytes */
 
-typedef unsigned int       _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
 /* This is the size of the interrupt state save returned by
diff --git a/arch/x86/include/i486/types.h b/arch/x86/include/i486/types.h
index 88379fd0ffd..d6f25f3e0e1 100755
--- a/arch/x86/include/i486/types.h
+++ b/arch/x86/include/i486/types.h
@@ -64,22 +64,22 @@
  * files
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
-typedef int                _int32_t;
+typedef signed int         _int32_t;
 typedef unsigned int       _uint32_t;
 
-typedef long long          _int64_t;
+typedef signed long long   _int64_t;
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
 /* A pointer is 4 bytes */
 
-typedef unsigned int       _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
 /* This is the size of the interrupt state save returned by
diff --git a/arch/z16/include/types.h b/arch/z16/include/types.h
index b83a6070de1..536cb52a74c 100644
--- a/arch/z16/include/types.h
+++ b/arch/z16/include/types.h
@@ -63,18 +63,18 @@
  * files
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
-typedef int                _int32_t;
+typedef signed int         _int32_t;
 typedef unsigned int       _uint32_t;
 
 /* A pointer is 4 bytes */
 
-typedef int               _intptr_t;
+typedef signed int        _intptr_t;
 typedef unsigned int      _uintptr_t;
 
 /* This is the size of the interrupt state save returned by
diff --git a/arch/z80/include/ez80/types.h b/arch/z80/include/ez80/types.h
index 4ca48e69731..f3569d9baa3 100644
--- a/arch/z80/include/ez80/types.h
+++ b/arch/z80/include/ez80/types.h
@@ -72,17 +72,17 @@
  *   float  - 32-bits
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef short              _int16_t;
+typedef signed short       _int16_t;
 typedef unsigned short     _uint16_t;
 
-typedef int                _int24_t;
+typedef signed int         _int24_t;
 typedef unsigned int       _uint24_t;
 #define __INT24_DEFINED
 
-typedef long               _int32_t;
+typedef signed long        _int32_t;
 typedef unsigned long      _uint32_t;
 
 /* A pointer is 2 or 3 bytes, depending upon if the ez80 is in z80
@@ -93,10 +93,10 @@ typedef unsigned long      _uint32_t;
  */
 
 #ifdef CONFIG_EZ80_Z80MODE
-typedef short              _intptr_t;
+typedef signed short       _intptr_t;
 typedef unsigned short     _uintptr_t;
 #else
-typedef int                _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 #endif
 
diff --git a/arch/z80/include/z8/types.h b/arch/z80/include/z8/types.h
index 0e269a5de3d..324ca236c4c 100644
--- a/arch/z80/include/z8/types.h
+++ b/arch/z80/include/z8/types.h
@@ -79,18 +79,18 @@
  *   rom pointer - 16-bits
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef int                _int16_t;
+typedef signed int         _int16_t;
 typedef unsigned int       _uint16_t;
 
-typedef long               _int32_t;
+typedef signed long        _int32_t;
 typedef unsigned long      _uint32_t;
 
 /* A pointer is 2 bytes */
 
-typedef unsigned int       _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
 /* This is the size of the interrupt state save returned by irqsave() */
diff --git a/arch/z80/include/z80/types.h b/arch/z80/include/z80/types.h
index 652ea5adf39..42bba5ac803 100644
--- a/arch/z80/include/z80/types.h
+++ b/arch/z80/include/z80/types.h
@@ -72,18 +72,18 @@
  * space information.
  */
 
-typedef char               _int8_t;
+typedef signed char        _int8_t;
 typedef unsigned char      _uint8_t;
 
-typedef int                _int16_t;
+typedef signed int         _int16_t;
 typedef unsigned int       _uint16_t;
 
-typedef long               _int32_t;
+typedef signed long        _int32_t;
 typedef unsigned long      _uint32_t;
 
 /* A pointer is 2 bytes */
 
-typedef int                _intptr_t;
+typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;
 
 /* This is the size of the interrupt state save returned by irqsave() */