erts: Add max alignment posix_memalign configure check

On some OSs posix_memalign exists, but it does not allow for alignment
greater than the current page size. So we have to do a runtime check for
alignment size and also add cross compile options.

1 files changed, 29 insertions, 1 deletions

diff --git a/erts/configure.in b/erts/configure.in
index f17f4cb5c8..8288a1aab1 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -1974,11 +1974,39 @@ AC_CHECK_FUNCS([getipnodebyname getipnodebyaddr gethostbyname2])
 
 AC_CHECK_FUNCS([ieee_handler fpsetmask finite isnan isinf res_gethostbyname dlopen \
 		pread pwrite memmove strerror strerror_r strncasecmp \
-		gethrtime localtime_r gmtime_r inet_pton posix_memalign \
+		gethrtime localtime_r gmtime_r inet_pton \
 		mmap mremap memcpy mallopt sbrk _sbrk __sbrk brk _brk __brk \
 		flockfile fstat strlcpy strlcat setsid posix2time time2posix \
 		setlocale nl_langinfo poll])
 
+
+case X$erl_xcomp_posix_memalign in
+     Xno) ;;
+     Xyes) AC_DEFINE(HAVE_POSIX_MEMALIGN,[1],
+                [Define to 1 if you have the `posix_memalign' function.]) ;;
+     *)
+	AC_CHECK_FUNC(
+		[posix_memalign],
+                [if test "$cross_compiling" != yes; then
+AC_TRY_RUN([
+#include <stdlib.h>
+int main(void) {
+    void *ptr = NULL;
+    int error;
+    size_t alignment = 0x40000, size = 0x20028;
+    if ((error = posix_memalign(&ptr, alignment, size)) != 0 || ptr == NULL)
+      return error;
+    return 0;
+}
+],AC_DEFINE(HAVE_POSIX_MEMALIGN,[1],
+    [Define to 1 if you have the `posix_memalign' function.])
+)
+		 else
+			AC_DEFINE(HAVE_POSIX_MEMALIGN,[1],
+		[Define to 1 if you have the `posix_memalign' function.])
+		 fi]);;
+esac
+
 dnl writev on OS X snow leopard is broken for files > 4GB
 case $host_os in
         darwin10.8.0)