From 8af7b8c13019a8aadeec28bf26da87e585e324cd Mon Sep 17 00:00:00 2001
From: Pavel Kirienko <pavel.kirienko@gmail.com>
Date: Fri, 17 Mar 2017 13:08:07 +0300
Subject: [PATCH] Poisoned the C library identifiers

---
 test/test_macros.hpp | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/test/test_macros.hpp b/test/test_macros.hpp
index 998264db82..28b2a32070 100644
--- a/test/test_macros.hpp
+++ b/test/test_macros.hpp
@@ -4,9 +4,44 @@
  * Helps with cmake testing.
  *
  * @author James Goppert <james.goppert@gmail.com>
+ *         Pavel Kirienko <pavel.kirienko@zubax.com>
  */
 #pragma once
 
 #include <cstdio>
+#include <cmath>    // cmath has to be introduced BEFORE we poison the C library identifiers
 
 #define TEST(X) if(!(X)) { fprintf(stderr, "test failed on %s:%d\n", __FILE__, __LINE__); return -1;}
+
+/**
+ * This construct is needed to catch any unintended use of the C standard library.
+ * Feel free to extend the list of poisoned identifiers with as many C functions as possible.
+ * The current list was constructed by means of automated parsing of http://en.cppreference.com/w/c/numeric/math
+ */
+#ifdef __GNUC__
+
+// float functions
+# pragma GCC poison fabsf fmodf
+# pragma GCC poison remainderf remquof fmaf fmaxf fminf fdimf fnanf expf
+# pragma GCC poison exp2f expm1f logf log10f log2f log1pf powf sqrtf cbrtf
+# pragma GCC poison hypotf sinf cosf tanf asinf acosf atanf atan2f sinhf
+# pragma GCC poison coshf tanhf asinhf acoshf atanhf erff erfcf tgammaf
+# pragma GCC poison lgammaf ceilf floorf truncf roundf nearbyintf rintf
+# pragma GCC poison frexpf ldexpf modff scalbnf ilogbf logbf nextafterf
+# pragma GCC poison copysignf
+
+// double functions
+// this list is scarce because otherwise most functions from std:: would be also poisoned, which we don't want
+# pragma GCC poison fabs
+
+// long double functions
+# pragma GCC poison fabsl fabsl fabsl fmodl
+# pragma GCC poison remainderl remquol fmal fmaxl fminl fdiml fnanl expl
+# pragma GCC poison exp2l expm1l logl log10l log2l log1pl powl sqrtl cbrtl
+# pragma GCC poison hypotl sinl cosl tanl asinl acosl atanl atan2l sinhl
+# pragma GCC poison coshl tanhl asinhl acoshl atanhl erfl erfcl tgammal
+# pragma GCC poison lgammal ceill floorl truncl roundl nearbyintl rintl
+# pragma GCC poison frexpl ldexpl modfl scalbnl ilogbl logbl nextafterl
+# pragma GCC poison copysignl
+
+#endif