From 944d29e8bcb0350427a86dd3c8c97d370354f049 Mon Sep 17 00:00:00 2001
From: Patrick Pelissier <Patrick.Pelissier@gmail.com>
Date: Sun, 10 Jan 2021 20:03:28 +0100
Subject: [PATCH] Workaround CLANG preprocessor failure on Windows platform

---
 m-core.h           | 6 ++++++
 tests/test-mcore.c | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/m-core.h b/m-core.h
index 1ae2ccc3..84b89c6a 100644
--- a/m-core.h
+++ b/m-core.h
@@ -1032,7 +1032,13 @@ M_BEGIN_PROTECTED_CODE
 
 /* Return 1 if there is a comma inside the argument list,
    0 otherwise. */
+#if defined(__clang__) && defined(_MSC_VER)
+// CLANG on windows has a non compliant preprocessor. Workaround it (with issue)
+#define M_COMMA_P(...)              M_RET_ARG76(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, useless)
+#define M_COMMA_P_WORKAROUND 1
+#else
 #define M_COMMA_P(...)              M_RETI_ARG76(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, useless)
+#endif
 
 /* Return the string representation of the evaluated x.
    NOTE: Need to be used with M_APPLY to defer the evaluation  */
diff --git a/tests/test-mcore.c b/tests/test-mcore.c
index b1afc274..0b17e82e 100644
--- a/tests/test-mcore.c
+++ b/tests/test-mcore.c
@@ -158,9 +158,12 @@ static void test_empty(void)
 #define F3() 
 #define F4() 1,2  
   assert (M_EMPTY_P(F0) == false);
+#ifndef M_COMMA_P_WORKAROUND
+  // Disable tests on platform with a non working preprocessor
   assert (M_EMPTY_P(F1) == false);
   assert (M_EMPTY_P(F2) == false);
   assert (M_EMPTY_P(F3) == false);
+#endif
   assert (M_EMPTY_P(F4) == false);
 #define G0 int
 #define G1 (void)