https://bugs.exim.org/show_bug.cgi?id=1774
Bug ID: 1774
Summary: Can't build JIT for Android ARM64
Product: PCRE
Version: 10.20 (PCRE2)
Hardware: Other
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Android doesn't define cacheflush on all architectures, such as ARM64.
unistd.h has this comment:
#if defined(__arm__) || (defined(__mips__) && !defined(__LP64__))
extern int cacheflush(long, long, long);
/* __attribute__((deprecated("use __builtin___clear_cache instead"))); */
#endif
So, we might as well use it:
diff --git a/src/sljit/sljitConfigInternal.h b/src/sljit/sljitConfigInternal.h
index 8a4b966..e0f88fd 100644
--- a/src/sljit/sljitConfigInternal.h
+++ b/src/sljit/sljitConfigInternal.h
@@ -262,6 +262,14 @@
#define SLJIT_UNUSED_ARG(arg) (void)arg
#endif
+#ifndef SLJIT_HAS_BUILTIN
+#ifdef __has_builtin
+#define SLJIT_HAS_BUILTIN(x) __has_builtin(x)
+#else
+#define SLJIT_HAS_BUILTIN(x) 0
+#endif
+#endif
+
/*********************************/
/* Type of public API functions. */
/*********************************/
@@ -286,7 +294,14 @@
#ifndef SLJIT_CACHE_FLUSH
-#if (defined SLJIT_CONFIG_X86 && SLJIT_CONFIG_X86)
+#if (__GNUC__ > 4 \
+ || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) \
+ || SLJIT_HAS_BUILTIN(__builtin___clear_cache))
+
+#define SLJIT_CACHE_FLUSH(from, to) \
+ __builtin___clear_cache((char*)from, (char*)to)
+
+#elif (defined SLJIT_CONFIG_X86 && SLJIT_CONFIG_X86)
/* Not required to implement on archs with unified caches. */
#define SLJIT_CACHE_FLUSH(from, to)
--
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