From b3c27e56063a3357869266bf4a836b67859a927e Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Sat, 7 Apr 2012 14:02:04 -0700
Subject: * configure: Added new check for some clashing external names, which
 we can redefine out of the way in config.h.

* lib.c: config.h was being included before <windows.h>.
---
 ChangeLog |  7 +++++++
 configure | 40 ++++++++++++++++++++++++++++++++++++++++
 lib.c     |  2 +-
 3 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 0413e9a2..f4c26d8c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2012-04-07  Kaz Kylheku  <kaz@kylheku.com>
+
+	* configure: Added new check for some clashing external names,
+	which we can redefine out of the way in config.h.
+
+	* lib.c: config.h was being included before <windows.h>.
+
 2012-04-07  Kaz Kylheku  <kaz@kylheku.com>
 
 	* txr.1: Documented int-flo, flo-int, search-regex,
diff --git a/configure b/configure
index 6c6d7c2e..f52f3470 100755
--- a/configure
+++ b/configure
@@ -1045,6 +1045,46 @@ else
   printf "#define HAVE_GETENVIRONMENTSTRINGS 1\n" >> config.h
 fi
 
+#
+# Check for annoying clashes from non-conforming BSD-derived systems that don't
+# honor Unix/POSIX feature selection macros!
+#
+
+printf "Checking for name clashes caused by nonconforming toolchains ... "
+
+for ident in trunc floorf random ; do
+  cat > conftest.c <<!
+#include <assert.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <float.h>
+#include <limits.h>
+#include <math.h>
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+#include <wchar.h>
+#include <wctype.h>
+
+struct txr_foo { int txr; } $ident;
+
+int $ident(void);
+
+int main(void) { return 0; }
+!
+  rm -f conftest
+  if ! make conftest > conftest.err 2>&1 || ! [ -x conftest ] ; then
+    printf "#define %s txr_%s\n" $ident $ident >> config.h
+  fi
+done
+
 #
 # Extra debugging.
 #
diff --git a/lib.c b/lib.c
index 51c584b0..30ac7d8d 100644
--- a/lib.c
+++ b/lib.c
@@ -36,11 +36,11 @@
 #include <errno.h>
 #include <wchar.h>
 #include <math.h>
-#include "config.h"
 #ifdef HAVE_GETENVIRONMENTSTRINGS
 #define NOMINMAX
 #include <windows.h>
 #endif
+#include "config.h"
 #include "lib.h"
 #include "gc.h"
 #include "arith.h"
-- 
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