[rust] Declare madvise() on illumos

nikic · nikic · commit 54c586958564 · 2022-02-13T14:43:38.000+01:00
Illumos seems to have made a real mess here. Adopt the same workaround as https://reviews.llvm.org/D84046 and https://reviews.llvm.org/D86166.
diff --git a/llvm/lib/Support/Unix/Path.inc b/llvm/lib/Support/Unix/Path.inc
@@ -118,6 +118,12 @@ typedef uint_t uint;
 #define STATVFS_F_FLAG(vfs) (vfs).f_flags
 #endif
 
+#if defined(__sun__)
+// The madvise() declaration on Illumos cannot be made visible if _XOPEN_SOURCE
+// is defined. This declaration is also compatible with Solaris 11.4.
+extern "C" int madvise(void *, size_t, int);
+#endif
+
 using namespace llvm;
 
 namespace llvm {
