Workaround for implicit declaration of function 'madvise' on Solaris

On Solaris, madvise(3C) is NOT defined for SUS (XPG4v2) or later,
but MADV_* macros are defined when __EXTENSIONS__ is defined.
This may cause compile error on Solaris 10 with GCC when
"-Werror=implicit-function-declaration" and "-D_XOPEN_SOURCE=600"
are added by configure.

1 files changed, 8 insertions, 0 deletions

diff --git a/cont.c b/cont.c
index 8a56fa6735..2af7971a9a 100644
--- a/cont.c
+++ b/cont.c
@@ -16,6 +16,14 @@
 #include <sys/mman.h>
 #endif
 
+// On Solaris, madvise() is NOT declared for SUS (XPG4v2) or later,
+// but MADV_* macros are defined when __EXTENSIONS__ is defined.
+#if defined(__sun) && defined(HAVE_CADDR_T) && \
+    (defined(MADV_FREE) || defined(MADV_DONTNEED))
+#include <sys/types.h>
+extern int madvise(caddr_t, size_t, int);
+#endif
+
 #include COROUTINE_H
 
 #include "eval_intern.h"