clang-tidy: Ignore the external directory

The external directory contains code for external librairies. It should not be inspected by clang-tidy. The regex syntax does not allow to directly ignore a directory. Solve this issue by adding a `clang-tidy` config file in the external directory which disables all the checks. See: https://stackoverflow.com/questions/74349432/clang-tidy-exclude-specific-dir-from-analysis See: https://stackoverflow.com/questions/58338202/cmake-clang-tidy-disable-checking-in-directory See: https://gitlab.kitware.com/cmake/cmake/-/merge_requests/777/diffs
qgis · Feb 19, 2025 · ac21a8d · ac21a8d
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diff --git a/.clang-tidy b/.clang-tidy
@@ -1 +1,2 @@
 Checks: 'bugprone-*,-bugprone-easily-swappable-parameters,-bugprone-virtual-near-miss,-bugprone-suspicious-include'
+HeaderFilterRegex: ''
diff --git a/external/.clang-tidy b/external/.clang-tidy
@@ -0,0 +1,4 @@
+# clang-tidy does not allow easy deactivation of a directory.
+# Use a dummy .clang-tidy file that disables all clang-tidy checks except one that will never match.
+# This one check is necessary; clang-tidy reports an error when no checks are enabled.
+Checks: '-*,llvm-twine-local'
Original file line number	Diff line number	Diff line change
		@@ -1 +1,2 @@
		Checks: 'bugprone-*,-bugprone-easily-swappable-parameters,-bugprone-virtual-near-miss,-bugprone-suspicious-include'
		HeaderFilterRegex: ''