From 665adcd4b7bcdb7deb638cdc499fbe71f8d777f2 Mon Sep 17 00:00:00 2001
From: Yang Tse <yangsita@gmail.com>
Date: Fri, 23 Nov 2012 17:57:00 +0100
Subject: build: fix AIX compilation and usage

AIX sys/poll.h header file defines 'events' and 'revents' as C
preprocessor macros. Usage of these literals in libcurl's external
API was introduced in commit de24d7bd4c causing AIX build failures.
Appropriate inclusion of sys/poll.h by libcurl's external interface
fixes AIX build and usage issues while avoiding a SONAME bump.
---
 acinclude.m4 | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

(limited to 'acinclude.m4')

diff --git a/acinclude.m4 b/acinclude.m4
index 930574542..ae9d8cdda 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -150,6 +150,7 @@ AC_DEFUN([CURL_CHECK_AIX_ALL_SOURCE], [
 #endif])
   AC_BEFORE([$0], [AC_SYS_LARGEFILE])dnl
   AC_BEFORE([$0], [CURL_CONFIGURE_REENTRANT])dnl
+  AC_BEFORE([$0], [CURL_CONFIGURE_PULL_SYS_POLL])dnl
   AC_MSG_CHECKING([if OS is AIX (to define _ALL_SOURCE)])
   AC_EGREP_CPP([yes_this_is_aix],[
 #ifdef _AIX
@@ -2310,6 +2311,8 @@ AC_DEFUN([CURL_CONFIGURE_CURL_SOCKLEN_T], [
   AC_REQUIRE([CURL_INCLUDES_SYS_SOCKET])dnl
   AC_REQUIRE([CURL_PREPROCESS_CALLCONV])dnl
   #
+  AC_BEFORE([$0], [CURL_CONFIGURE_PULL_SYS_POLL])dnl
+  #
   AC_MSG_CHECKING([for curl_socklen_t data type])
   curl_typeof_curl_socklen_t="unknown"
   for arg1 in int SOCKET; do
@@ -2418,6 +2421,45 @@ AC_DEFUN([CURL_CONFIGURE_CURL_SOCKLEN_T], [
 ])
 
 
+dnl CURL_CONFIGURE_PULL_SYS_POLL
+dnl -------------------------------------------------
+dnl Find out if system header file sys/poll.h must be included by the
+dnl external interface, making appropriate definitions for template file
+dnl include/curl/curlbuild.h.in to properly configure and use the library.
+dnl
+dnl The need for the sys/poll.h inclusion arises mainly to properly
+dnl interface AIX systems which define macros 'events' and 'revents'.
+
+AC_DEFUN([CURL_CONFIGURE_PULL_SYS_POLL], [
+  AC_REQUIRE([CURL_INCLUDES_POLL])dnl
+  #
+  tst_poll_events_macro_defined="unknown"
+  #
+  AC_COMPILE_IFELSE([
+    AC_LANG_PROGRAM([[
+      $curl_includes_poll
+    ]],[[
+#if defined(events) || defined(revents)
+      return 0;
+#else
+      force compilation error
+#endif
+    ]])
+  ],[
+    tst_poll_events_macro_defined="yes"
+  ],[
+    tst_poll_events_macro_defined="no"
+  ])
+  #
+  if test "$tst_poll_events_macro_defined" = "yes"; then
+    if test "x$ac_cv_header_sys_poll_h" = "xyes"; then
+      CURL_DEFINE_UNQUOTED([CURL_PULL_SYS_POLL_H])
+    fi
+  fi
+  #
+])
+
+
 dnl CURL_CHECK_FUNC_SELECT
 dnl -------------------------------------------------
 dnl Test if the socket select() function is available,
-- 
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