diff --git a/libgcc/config/arm/freebsd-atomic.c b/libgcc/config/arm/freebsd-atomic.c
index 7cf00b1e75d..b39706daa25 100644
--- a/libgcc/config/arm/freebsd-atomic.c
+++ b/libgcc/config/arm/freebsd-atomic.c
@@ -127,8 +127,6 @@ __sync_val_compare_and_swap_##N (TYPE *mem, TYPE expected,		\
         return (old);							\
 }
 
-typedef unsigned char bool;
-
 #define SYNC_BOOL_CAS_N(N, TYPE)                                        \
 bool HIDDEN								\
 __sync_bool_compare_and_swap_##N (TYPE *ptr, TYPE oldval,		\
diff --git a/libgcc/config/arm/linux-atomic-64bit.c b/libgcc/config/arm/linux-atomic-64bit.c
index b35dcec0fb7..45286a50cfb 100644
--- a/libgcc/config/arm/linux-atomic-64bit.c
+++ b/libgcc/config/arm/linux-atomic-64bit.c
@@ -141,8 +141,6 @@ __sync_val_compare_and_swap_8 (long long *ptr, long long oldval,
     }
 }
 
-typedef unsigned char bool;
-
 bool HIDDEN
 __sync_bool_compare_and_swap_8 (long long *ptr, long long oldval,
 				 long long newval)
diff --git a/libgcc/config/arm/linux-atomic.c b/libgcc/config/arm/linux-atomic.c
index 2ad68ead502..e1f6d27519f 100644
--- a/libgcc/config/arm/linux-atomic.c
+++ b/libgcc/config/arm/linux-atomic.c
@@ -249,8 +249,6 @@ __sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
 SUBWORD_VAL_CAS (short,       2)
 SUBWORD_VAL_CAS (signed char, 1)
 
-typedef unsigned char bool;
-
 bool HIDDEN
 __sync_bool_compare_and_swap_4 (int *ptr, int oldval, int newval)
 {
diff --git a/libgcc/config/nds32/linux-atomic.c b/libgcc/config/nds32/linux-atomic.c
index ef869e05f03..5a5e7c0184a 100644
--- a/libgcc/config/nds32/linux-atomic.c
+++ b/libgcc/config/nds32/linux-atomic.c
@@ -208,8 +208,6 @@ __sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
 SUBWORD_VAL_CAS (unsigned short, 2)
 SUBWORD_VAL_CAS (unsigned char,  1)
 
-typedef unsigned char bool;
-
 bool HIDDEN
 __sync_bool_compare_and_swap_4 (int *ptr, int oldval, int newval)
 {
diff --git a/libgcc/config/nios2/linux-atomic.c b/libgcc/config/nios2/linux-atomic.c
index 9bb25575fbc..1cad60b8e4f 100644
--- a/libgcc/config/nios2/linux-atomic.c
+++ b/libgcc/config/nios2/linux-atomic.c
@@ -207,8 +207,6 @@ __sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
 SUBWORD_VAL_CAS (unsigned short, 2)
 SUBWORD_VAL_CAS (unsigned char,  1)
 
-typedef unsigned char bool;
-
 bool HIDDEN
 __sync_bool_compare_and_swap_4 (int *ptr, int oldval, int newval)
 {