From: Matthias Maier <tamiko@43-1.org>
Date: Tue, 20 Apr 2021 01:23:51 +0000 (-0500)
Subject: fix a warning
X-Git-Tag: v9.3.0-rc1~207^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=396fe0dd28bd560dbff391bf0212c960df47f0fc;p=dealii.git

fix a warning

This fixes a warning emitted by gcc-10.3.0:

  warning: comparison of unsigned expression in ‘< 0’ is always false [-Wtype-limits]
---

diff --git a/source/base/quadrature_lib.cc b/source/base/quadrature_lib.cc
index 0f69c4e9c9..b72c6564f0 100644
--- a/source/base/quadrature_lib.cc
+++ b/source/base/quadrature_lib.cc
@@ -1203,7 +1203,11 @@ QSimplex<dim>::QSimplex(const Quadrature<dim> &quad)
   for (unsigned int i = 0; i < quad.size(); ++i)
     {
       double r = 0;
-      for (unsigned int d = 0; d < dim; ++d)
+      /* Use "int d" instead of the more natural "unsigned int d" to work
+       * around a wrong diagnostic in gcc-10.3.0 that warns about that the
+       * comparison "d < dim" is always false in case of "dim == 0".
+       * MM 2021 */
+      for (int d = 0; d < dim; ++d)
         r += quad.point(i)[d];
       if (r <= 1 + 1e-10)
         {