Add throw specifier for GCC

/usr/include/string.h:43:28: error: declaration of ‘void* memcpy(void*, const void*, size_t) throw ()’ has a different exception specifier
        size_t __n) __THROW __nonnull ((1, 2));

src/pal/inc/mbusafecrt.h

@@ -31,6 +31,12 @@ typedef int errno_t;
 // define the return value for success 
 #define SAFECRT_SUCCESS 0
 
+#if defined(_MSC_VER) || defined(__llvm__)
+#define THROW_DECL
+#else
+#define THROW_DECL throw()
+#endif
+
 #ifdef __cplusplus
     extern "C" {
 #endif
@@ -98,7 +104,7 @@ extern int swscanf_s( const WCHAR *string, const WCHAR *format, ... );
 extern int _snscanf_s( const char *string, size_t count, const char *format, ... );
 extern int _snwscanf_s( const WCHAR *string, size_t count, const WCHAR *format, ... );
 
-extern errno_t memcpy_s( void * dst, size_t sizeInBytes, const void * src, size_t count );
+extern errno_t memcpy_s( void * dst, size_t sizeInBytes, const void * src, size_t count ) THROW_DECL;
 extern errno_t memmove_s( void * dst, size_t sizeInBytes, const void * src, size_t count );
 
 #ifdef __cplusplus

src/pal/inc/pal.h

@@ -143,6 +143,11 @@ typedef void * NATIVE_LIBRARY_HANDLE;
 #define LANG_THAI                        0x1e
 
 /******************* Compiler-specific glue *******************************/
+#if defined(_MSC_VER) || defined(__llvm__)
+#define THROW_DECL
+#else
+#define THROW_DECL throw()
+#endif
 
 #ifndef _MSC_VER
 #if defined(CORECLR)
@@ -4324,7 +4329,7 @@ PALIMPORT int    __cdecl memcmp(const void *, const void *, size_t);
 PALIMPORT void * __cdecl memset(void *, int, size_t);
 PALIMPORT void * __cdecl memmove(void *, const void *, size_t);
 PALIMPORT void * __cdecl memchr(const void *, int, size_t);
-PALIMPORT long long int __cdecl atoll(const char *);
+PALIMPORT long long int __cdecl atoll(const char *) THROW_DECL;
 PALIMPORT size_t __cdecl strlen(const char *);
 PALIMPORT int __cdecl strcmp(const char*, const char *);
 PALIMPORT int __cdecl strncmp(const char*, const char *, size_t);
@@ -4363,7 +4368,7 @@ PALIMPORT int __cdecl toupper(int);
 #define _TRUNCATE ((size_t)-1)
 #endif
 
-PALIMPORT errno_t __cdecl memcpy_s(void *, size_t, const void *, size_t);
+PALIMPORT errno_t __cdecl memcpy_s(void *, size_t, const void *, size_t) THROW_DECL;
 PALIMPORT errno_t __cdecl memmove_s(void *, size_t, const void *, size_t);
 PALIMPORT char * __cdecl _strlwr(char *);
 PALIMPORT int __cdecl _stricmp(const char *, const char *);
@@ -4503,10 +4508,10 @@ PALIMPORT double __cdecl acos(double);
 PALIMPORT double __cdecl acosh(double);
 PALIMPORT double __cdecl asin(double);
 PALIMPORT double __cdecl asinh(double);
-PALIMPORT double __cdecl atan(double);
-PALIMPORT double __cdecl atanh(double);
+PALIMPORT double __cdecl atan(double) THROW_DECL;
+PALIMPORT double __cdecl atanh(double) THROW_DECL;
 PALIMPORT double __cdecl atan2(double, double);
-PALIMPORT double __cdecl cbrt(double);
+PALIMPORT double __cdecl cbrt(double) THROW_DECL;
 PALIMPORT double __cdecl ceil(double);
 PALIMPORT double __cdecl cos(double);
 PALIMPORT double __cdecl cosh(double);
@@ -4536,10 +4541,10 @@ PALIMPORT float __cdecl acosf(float);
 PALIMPORT float __cdecl acoshf(float);
 PALIMPORT float __cdecl asinf(float);
 PALIMPORT float __cdecl asinhf(float);
-PALIMPORT float __cdecl atanf(float);
-PALIMPORT float __cdecl atanhf(float);
+PALIMPORT float __cdecl atanf(float) THROW_DECL;
+PALIMPORT float __cdecl atanhf(float) THROW_DECL;
 PALIMPORT float __cdecl atan2f(float, float);
-PALIMPORT float __cdecl cbrtf(float);
+PALIMPORT float __cdecl cbrtf(float) THROW_DECL;
 PALIMPORT float __cdecl ceilf(float);
 PALIMPORT float __cdecl cosf(float);
 PALIMPORT float __cdecl coshf(float);

src/pal/src/safecrt/memcpy_s.cpp

@@ -54,7 +54,7 @@ errno_t __cdecl memcpy_s(
     size_t sizeInBytes,
     const void * src,
     size_t count
-)
+) THROW_DECL
 {
     if (count == 0)
     {