🚨 suppress warnings

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

.clang-tidy

@@ -1,4 +1,5 @@
 # TODO: The first three checks are only removed to get the CI going. They have to be addressed at some point.
+# TODO: portability-avoid-pragma-once: should be fixed eventually
 
 Checks: '*,
 
@@ -59,6 +60,7 @@ Checks: '*,
          -modernize-use-std-numbers,
          -modernize-use-trailing-return-type,
          -performance-enum-size,
+         -portability-avoid-pragma-once,
          -readability-function-cognitive-complexity,
          -readability-function-size,
          -readability-identifier-length,

cmake/clang_flags.cmake

@@ -3,6 +3,7 @@
 # -Wno-c++98-compat-pedantic      The library targets C++11.
 # -Wno-deprecated-declarations    The library contains annotations for deprecated functions.
 # -Wno-extra-semi-stmt            The library uses assert which triggers this warning.
+# -Wno-nrvo                       Doctest triggers this warning.
 # -Wno-padded                     We do not care about padding warnings.
 # -Wno-covered-switch-default     All switches list all cases and a default case.
 # -Wno-unsafe-buffer-usage        Otherwise Doctest would not compile.
@@ -14,6 +15,7 @@ set(CLANG_CXXFLAGS
     -Wno-c++98-compat-pedantic
     -Wno-deprecated-declarations
     -Wno-extra-semi-stmt
+    -Wno-nrvo
     -Wno-padded
     -Wno-covered-switch-default
     -Wno-unsafe-buffer-usage