mmap: Solaris 10 build fix.

Solaris 10's <sys/mman.h> header doesn't declare madvise if
_POSIX_C_SOURCE > 2 is defined or _XPTG4_2, even though
__EXTENSIONS__ is defined. This is a bug in the header.

* configure (solaris_target): New variable. We set this to y
in several places where the script discovers that
-D__EXTENSIONS__ is required to get something to work, which
is a Solaris 10 telltale sign. Then just before the mmap test,
if solaris_target is true, we deposit a blurb into config.h
that declares madvise.  This way, the ffi.c code, or any other
committed C code doesn't have to carry any Solaris hack.

1 files changed, 20 insertions, 0 deletions

diff --git a/configure b/configure
index 0008f764..6cbf5570 100755
--- a/configure
+++ b/configure
@@ -212,6 +212,7 @@ have_pkgconfig=
 libffi_cflags=
 darwin_target=
 android_target=
+solaris_target=
 build_id=
 
 #
@@ -2973,6 +2974,7 @@ elif conftest EXTRA_FLAGS=-D__EXTENSIONS__=1 ; then
   gen_config_make
   have_unistd=y
   have_sys_types=y
+  solaris_target=y
 else
   printf "no\n"
 fi
@@ -3259,6 +3261,9 @@ int main(int argc, char **argv)
     printf "yes\n"
     printf "#define HAVE_WINSIZE 1\n" >> config.h
     have_winsize=y
+    if [ "$termios_define" = __EXTENSIONS__ ] ; then
+      solaris_target=y
+    fi
     break;
   fi
 done
@@ -3781,11 +3786,24 @@ else
   printf "no\n"
 fi
 
+if [ $solaris_target ] ; then
+  cat >> config.h <<!
+#include <stddef.h>
+#ifdef __sun__
+#ifdef __cplusplus
+extern "C"
+#endif
+int madvise(void *addr, size_t len, int behav);
+#endif
+!
+fi
+
 printf "Checking for mmap ... "
 cat > conftest.c <<!
 #include <sys/mman.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include "config.h"
 
 int main(void)
 {
@@ -3807,6 +3825,8 @@ if conftest ; then
   printf "#define HAVE_MMAP 1\n" >> config.h
 else
   printf "no\n"
+  cat conftest.err
+  exit 1
 fi