diff --git a/common_thread.h b/common_thread.h
index 06a7a1a38..70c724597 100644
--- a/common_thread.h
+++ b/common_thread.h
@@ -141,14 +141,14 @@ static __inline int num_cpu_avail(int level) {
 
 #ifdef USE_OPENMP
 int openmp_nthreads;
-	openmp_nthreads=omp_get_max_threads();
+	openmp_nthreads=omp_get_max_threads(void);
 #endif
 
 #ifndef USE_OPENMP 
   if (blas_cpu_number == 1
 #endif
 #ifdef USE_OPENMP
-     if (openmp_nthreads == 1 || omp_in_parallel()
+     if (openmp_nthreads == 1 || omp_in_parallel(void)
 #endif
       ) return 1;        
 
@@ -192,27 +192,27 @@ int exec_blas(BLASLONG num_cpu, blas_param_t *param, void *buffer);
 int blas_level1_thread(int mode, BLASLONG m, BLASLONG n, BLASLONG k, void *alpha,
 		       void *a, BLASLONG lda,
 		       void *b, BLASLONG ldb,
-		       void *c, BLASLONG ldc, int (*function)(), int threads);
+		       void *c, BLASLONG ldc, int (*function)(void), int threads);
 
-int gemm_thread_m (int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(), void *, void *, BLASLONG);
+int gemm_thread_m (int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(blas_arg_t*, BLASLONG*, BLASLONG*,FLOAT *, FLOAT *, BLASLONG ), void *, void *, BLASLONG);
 
-int gemm_thread_n (int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(), void *, void *, BLASLONG);
+int gemm_thread_n (int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(blas_arg_t*, BLASLONG*, BLASLONG*,FLOAT*, FLOAT*, BLASLONG), void *, void *, BLASLONG);
 
-int gemm_thread_mn(int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(), void *, void *, BLASLONG);
+int gemm_thread_mn(int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(blas_arg_t*, BLASLONG*, BLASLONG*,FLOAT *, FLOAT *, BLASLONG), void *, void *, BLASLONG);
 
-int gemm_thread_variable(int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(), void *, void *, BLASLONG, BLASLONG);
+int gemm_thread_variable(int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(blas_arg_t*, BLASLONG*, BLASLONG*,FLOAT *, FLOAT *, BLASLONG), void *, void *, BLASLONG, BLASLONG);
 
 int trsm_thread(int mode, BLASLONG m, BLASLONG n,
 		double alpha_r, double alpha_i,
 		void *a, BLASLONG lda,
-		void *c, BLASLONG ldc, int (*function)(), void *buffer);
+		void *c, BLASLONG ldc, int (*function)(void), void *buffer);
 
-int syrk_thread(int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(), void *, void *, BLASLONG);
+int syrk_thread(int mode, blas_arg_t *, BLASLONG *, BLASLONG *, int (*function)(blas_arg_t*, BLASLONG*, BLASLONG*, FLOAT *, FLOAT *, BLASLONG), void*, void*, BLASLONG);
 
 int getrf_thread(int mode, BLASLONG m, BLASLONG n, BLASLONG k,
 		 void *offsetA, BLASLONG lda,
 		 void *offsetB, BLASLONG jb,
-		 void *ipiv, BLASLONG offset, int (*function)(), void *buffer);
+		 void *ipiv, BLASLONG offset, int (*function)(void), void *buffer);
 
 #endif  /* ENDIF ASSEMBLER */
 
diff --git a/cpuid_x86.c b/cpuid_x86.c
index c485f3ddf..fdcead8bd 100644
--- a/cpuid_x86.c
+++ b/cpuid_x86.c
@@ -194,7 +194,7 @@ static C_INLINE void xgetbv(int op, int * eax, int * edx){
 }
 #endif
 
-int support_avx(){
+int support_avx(void){
 #ifndef NO_AVX
   int eax, ebx, ecx, edx;
   int ret=0;
@@ -212,7 +212,7 @@ int support_avx(){
 #endif
 }
 
-int support_avx2(){
+int support_avx2(void){
 #ifndef NO_AVX2
   int eax, ebx, ecx=0, edx;
   int ret=0;
@@ -228,7 +228,7 @@ int support_avx2(){
 #endif
 }
 
-int support_avx512(){
+int support_avx512(void){
 #if !defined(NO_AVX) && !defined(NO_AVX512)
   int eax, ebx, ecx, edx;
   int ret=0;
@@ -250,7 +250,7 @@ int support_avx512(){
 #endif
 }
 
-int support_avx512_bf16(){
+int support_avx512_bf16(void){
 #if !defined(NO_AVX) && !defined(NO_AVX512)
   int eax, ebx, ecx, edx;
   int ret=0;
@@ -271,7 +271,7 @@ int support_avx512_bf16(){
 #define BIT_AMX_BF16	0x00400000
 #define BIT_AMX_ENBD	0x00060000
 
-int support_amx_bf16() {
+int support_amx_bf16(void) {
 #if !defined(NO_AVX) && !defined(NO_AVX512)
   int eax, ebx, ecx, edx;
   int ret=0;