Packets/80211Bundle: Fix missing le16toh/le32toh on older libc

[senf.git] / SConfigure

diff --git a/SConfigure b/SConfigure
index 5d7dae2..40382e8 100644 (file)
--- a/SConfigure
+++ b/SConfigure
@@ -69,6 +69,37 @@ def CheckValgrindWildcards(context):
     context.Result( ret[0] )
     return ret[0]
 
+@env.ConfTest()
+def CheckExpression(context, name, expression, header="", language="C"):
+    import SCons.Conftest
+
+    lang, suffix, msg = SCons.Conftest._lang2suffix(language)
+    if msg:
+        context.Message("Cannot check for header file %s: \n" % header_name)
+        context.Result(msg)
+        return False
+
+    text = ("#include <assert.h>\n"
+            "%s\n"
+            "int main() {\n"
+            "%s;\n"
+            "return 0;\n"
+            "}\n") % (header, expression)
+
+    context.Message("Checking for valid %s expression %s... " % (lang, expression))
+    ret = context.TryLink(text, suffix)
+    context.Result(ret)
+    if ret:
+        import re
+        key = name.upper()
+        key = re.sub('[^A-Z0-9_]', '_', key)
+        context.sconf.Define("HAVE_%s" % key,
+                             1,
+                             "Define to 1 if the expression `%s' is valid on your system"
+                             % expression)
+
+    return ret
+
 ###########################################################################
 
 conf = env.Configure(clean=False, help=False, config_h="#/senf/autoconf.hh")
@@ -85,6 +116,10 @@ res = conf.CheckTempBufferStrategy()
 
 # Standard library stuff
 res = conf.CheckFunc("timerfd_create")
+res = conf.CheckExpression("le16toh", "le16toh(0)",
+                           "#include <senf/Packets/80211Bundle/radiotap/platform.h>")
+res = conf.CheckExpression("le32toh", "le32toh(0)",
+                           "#include <senf/Packets/80211Bundle/radiotap/platform.h>")
 res = conf.CheckSTLCopyN(); \
     conf.env.Fail(condition=not res, message="No 'copy_n' implementation found")