Coreclr gnuport (#22129)

* Abstract away NOINLINE statement

MSVC and GNU compilers use different attributes for noinline.
Abstract away compiler differences.

* Replace __sync_swap with __atomic_exchange_n

__sync_swap doesn't exist on GNU. Replacing with __atomic_exchange_n
which is universally available.

* Define CDECL for GNUC

__cdecl is not defined by default on GNU compilers.

* Define gcc version of __declspec(thread)

* Correct pointer casting

A pointer value is usually unsigned long on most platforms.
Casting it to integer causes signedness issues. Use size_t
to be efficient on all 32 and 64 bit architectures.

* Put quotes around the error string

Correct error statement. GNU G++ is picky about the string
following the error statement with ' character in it. It needs
to be enclosed with double quotes.

* Fix casting problem

Seeing these warnings with GNU G++ compiler

src/pal/src/sync/cs.cpp: In function ‘void CorUnix::InternalInitializeCriticalSectionAndSpinCount(PCRITICAL_SECTION, DWORD, bool)’:
src/pal/src/sync/cs.cpp:630:48: warning: converting to non-pointer type ‘SIZE_T {aka long unsigned int}’ from NULL [-Wconversion-null]
         pPalCriticalSection->OwningThread      = NULL;
                                                ^
src/pal/src/sync/cs.cpp: In function ‘void CorUnix::InternalLeaveCriticalSection(CorUnix::CPalThread*, _CRITICAL_SECTION*)’:
src/pal/src/sync/cs.cpp:880:43: warning: converting to non-pointer type ‘SIZE_T {aka long unsigned int}’ from NULL [-Wconversion-null]
         pPalCriticalSection->OwningThread = NULL;
                                           ^

* Abstract optnone compiler attribute

GNU compiler doesn't support optnone attribute.

pal/src/exception/seh-unwind.cpp:449:77: warning: ‘optnone’ attribute directive ignored [-Wattributes]

* Set the aligned attribute for GNU compiler

* Make __rotl and __rotr functions portable

GNU compiler doesn't have an intrinsic for these. Open code them
using the provided implementation.

* Define deprecated attribute for gcc

* 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));

3 files changed, 47 insertions, 16 deletions

diff --git a/src/pal/inc/mbusafecrt.h b/src/pal/inc/mbusafecrt.h
index f030b7ded2..9c516e032b 100644
--- a/src/pal/inc/mbusafecrt.h
+++ b/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
diff --git a/src/pal/inc/pal.h b/src/pal/inc/pal.h
index 76e04cdbdb..7bf34963fc 100644
--- a/src/pal/inc/pal.h
+++ b/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)
@@ -156,7 +161,7 @@ typedef void * NATIVE_LIBRARY_HANDLE;
 #if defined(_MSC_VER) || defined(__llvm__)
 #define DECLSPEC_ALIGN(x)   __declspec(align(x))
 #else
-#define DECLSPEC_ALIGN(x) 
+#define DECLSPEC_ALIGN(x)   __attribute__ ((aligned(x)))
 #endif
 
 #define DECLSPEC_NORETURN   PAL_NORETURN
@@ -176,6 +181,14 @@ typedef void * NATIVE_LIBRARY_HANDLE;
 #endif
 #endif
 
+#ifndef NOOPT_ATTRIBUTE
+#if defined(__llvm__)
+#define NOOPT_ATTRIBUTE optnone
+#else
+#define NOOPT_ATTRIBUTE optimize("O0")
+#endif
+#endif
+
 #ifndef PAL_STDCPP_COMPAT
 
 #if __GNUC__
@@ -3503,7 +3516,7 @@ InterlockedExchange(
     IN OUT LONG volatile *Target,
     IN LONG Value)
 {
-    LONG result = __sync_swap(Target, Value);
+    LONG result = __atomic_exchange_n(Target, Value, __ATOMIC_ACQ_REL);
     PAL_ArmInterlockedOperationBarrier();
     return result;
 }
@@ -3517,7 +3530,7 @@ InterlockedExchange64(
     IN OUT LONGLONG volatile *Target,
     IN LONGLONG Value)
 {
-    LONGLONG result = __sync_swap(Target, Value);
+    LONGLONG result = __atomic_exchange_n(Target, Value, __ATOMIC_ACQ_REL);
     PAL_ArmInterlockedOperationBarrier();
     return result;
 }
@@ -4316,7 +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);
@@ -4355,7 +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 *);
@@ -4426,7 +4439,15 @@ inline WCHAR *PAL_wcsstr(WCHAR *_S, const WCHAR *_P)
 }
 #endif
 
-#if !__has_builtin(_rotl)
+#if defined(__llvm__)
+#define HAS_ROTL __has_builtin(_rotl)
+#define HAS_ROTR __has_builtin(_rotr)
+#else
+#define HAS_ROTL 0
+#define HAS_ROTR 0
+#endif
+
+#if !HAS_ROTL
 /*++
 Function:
 _rotl
@@ -4444,14 +4465,14 @@ unsigned int __cdecl _rotl(unsigned int value, int shift)
     retval = (value << shift) | (value >> (sizeof(int) * CHAR_BIT - shift));
     return retval;
 }
-#endif // !__has_builtin(_rotl)
+#endif // !HAS_ROTL
 
 // On 64 bit unix, make the long an int.
 #ifdef BIT64
 #define _lrotl _rotl
 #endif // BIT64
 
-#if !__has_builtin(_rotr)
+#if !HAS_ROTR
 
 /*++
 Function:
@@ -4471,7 +4492,7 @@ unsigned int __cdecl _rotr(unsigned int value, int shift)
     return retval;
 }
 
-#endif // !__has_builtin(_rotr)
+#endif // !HAS_ROTR
 
 PALIMPORT int __cdecl abs(int);
 // clang complains if this is declared with __int64
@@ -4487,10 +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);
@@ -4520,10 +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);
diff --git a/src/pal/inc/rt/safecrt.h b/src/pal/inc/rt/safecrt.h
index 92366dfc38..9f9e15c244 100644
--- a/src/pal/inc/rt/safecrt.h
+++ b/src/pal/inc/rt/safecrt.h
@@ -135,7 +135,11 @@ typedef _W64 unsigned int   uintptr_t;
 #define _UINTPTR_T_DEFINED
 #endif
 
+#ifdef __GNUC__
+#define SAFECRT_DEPRECATED __attribute__((deprecated))
+#else
 #define SAFECRT_DEPRECATED __declspec(deprecated)
+#endif
 
 /* errno_t */
 #if !defined(_ERRCODE_DEFINED)