Release v04062019 3.5.0

See Changelog

Allow for manual definition of HAVE___SYNC_SYNCHRONIZE,
HAVE__MM_MFENCE, or HAVE__MM_SFENCE if the current compile-time
probes fail. This really should be put into configure (TODO).

Author: rurban

ChangeLog

@@ -1,7 +1,7 @@
 
         ChangeLog file for safeclib
 
-Changes in v07062019 3.5.0
+Changes in v04062019 3.5.0
         - Updated towctrans case-mappings and normalization to Unicode 12.1
           Even the canon tables on windows need now a special bsearch in an
           exception list, previously only the compat tables.

configure.ac

@@ -815,9 +815,12 @@ AC_CHECK_FUNCS([__memcpy_chk __memmove_chk __memset_chk \
         __strcpy_chk __strncpy_chk __strcat_chk __strncat_chk \
         __printf_chk __sprintf_chk __snprintf_chk __swprintf_chk \
         __vfprintf_chk __vfwprintf_chk __vsprintf_chk __vsnprintf_chk \
-        __vsscanf_chk __vswscanf_chk
-        ])
+        __vsscanf_chk __vswscanf_chk ])
 #done
+dnl They need to include the relevant intrin header first
+dnl TODO: probe for MEMORY_BARRIER and COMPILER_BARRIER here
+dnl AC_CHECK_FUNCS([ __sync_synchronize MemoryBarrier _mm_mfence _mm_sfence \
+dnl        __machine_rw_barrier ])
 AC_FUNC_MEMCMP
 dnl no header needed as is checks if the linker can find it
 dnl mbstowcs missing on cygwin64

src/mem/mem_primitives_lib.h

@@ -127,7 +127,8 @@
 
 #if defined __KERNEL__
 #define MEMORY_BARRIER mb()
-#elif defined(HAVE_X86_XMM) || defined(HAVE_X86_INTRIN) || defined(HAVE_X86_X86)
+#elif defined(HAVE_X86_XMM) || defined(HAVE_X86_INTRIN) ||                     \
+    defined(HAVE_X86_X86) || defined(HAVE__MM_MFENCE)
 #define MEMORY_BARRIER _mm_mfence()
 #elif defined(HAVE_ARM_DMB) && defined(_MSC_VER)
 #define MEMORY_BARRIER __dmb(_ARM_BARRIER_OSH)
@@ -144,14 +145,14 @@
 #define MEMORY_BARRIER ASM_VOLATILE("lock; addl $0,0(%%esp)" ::: "memory")
 #elif defined(ASM_INLINE) && (defined(HAVE_ARM_NEON) || defined(HAVE_ARM_NEON))
 #define MEMORY_BARRIER ASM_VOLATILE("dmb; dsb; isb" ::: "memory")
-#elif defined(__GNUC__) && __GNUC__ >= 4
+#elif (defined(__GNUC__) && __GNUC__ >= 4) || defined(HAVE___SYNC_SYNCHRONIZE)
 #define MEMORY_BARRIER __sync_synchronize()
 /* new gcc-5 memory_barrier insn for most archs:
    x86, mips, nios2, riscv, rs6000, s390, ia64, avr, alpha,
    arc, tilepro, xtensa, ..., but not in the arm-linux-gnueabihf-gcc 8.3 cross
    compiler */
 /* #define MEMORY_BARRIER ASM_VOLATILE("memory_barrier" ::: "memory") */
-#elif defined(HAVE_COMPAT_XMM)
+#elif defined(HAVE_COMPAT_XMM) || defined(HAVE__MM_SFENCE)
 /* x86-compat headers (e.g. rs6000, arm, ...) have no mfence */
 #define MEMORY_BARRIER _mm_sfence()
 #else