Fix DEAL_II_COMPILER_HAS_ATTRIBUTE_ALWAYS_INLINE with -Werror

diff --git a/cmake/checks/check_02_compiler_features.cmake b/cmake/checks/check_02_compiler_features.cmake
index 990eb0f77c8e506830d2d359e20857cd015498c9..52553b2cd432e300fce88046afef4d7c72ce8ed6 100644 (file)
--- a/cmake/checks/check_02_compiler_features.cmake
+++ b/cmake/checks/check_02_compiler_features.cmake
@@ -276,7 +276,7 @@ endif()
 #
 CHECK_CXX_SOURCE_COMPILES(
   "
-          __attribute__((always_inline)) int fn () { return 0; }
+          __attribute__((always_inline)) inline int fn () { return 0; }
           int main () { return fn(); }
   "
   DEAL_II_COMPILER_HAS_ATTRIBUTE_ALWAYS_INLINE