build: suppress external warnings by default

ci/test/06_script_b.sh

@@ -67,7 +67,7 @@ if [ "$DOWNLOAD_PREVIOUS_RELEASES" = "true" ]; then
   test/get_previous_releases.py -b -t "$PREVIOUS_RELEASES_DIR"
 fi
 
-BITCOIN_CONFIG_ALL="--enable-suppress-external-warnings --disable-dependency-tracking"
+BITCOIN_CONFIG_ALL="--disable-dependency-tracking"
 if [ -z "$NO_DEPENDS" ]; then
   BITCOIN_CONFIG_ALL="${BITCOIN_CONFIG_ALL} CONFIG_SITE=$DEPENDS_DIR/$HOST/share/config.site"
 fi

configure.ac

@@ -244,10 +244,10 @@ dnl May be useful if warnings from external headers clutter the build output
 dnl too much, so that it becomes difficult to spot Bitcoin Core warnings
 dnl or if they cause a build failure with --enable-werror.
 AC_ARG_ENABLE([suppress-external-warnings],
-  [AS_HELP_STRING([--enable-suppress-external-warnings],
-                  [Suppress warnings from external headers (default is no)])],
+  [AS_HELP_STRING([--disable-suppress-external-warnings],
+                  [Do not suppress warnings from external headers (default is to suppress)])],
   [suppress_external_warnings=$enableval],
-  [suppress_external_warnings=no])
+  [suppress_external_warnings=yes])
 
 AC_ARG_ENABLE([lcov],
   [AS_HELP_STRING([--enable-lcov],

doc/developer-notes.md

@@ -217,13 +217,11 @@ apt install clang-tidy bear clang
 Then, pass clang as compiler to configure, and use bear to produce the `compile_commands.json`:
 
 ```sh
-./autogen.sh && ./configure CC=clang CXX=clang++ --enable-suppress-external-warnings
+./autogen.sh && ./configure CC=clang CXX=clang++
 make clean && bear --config src/.bear-tidy-config -- make -j $(nproc)
 ```
 
-The output is denoised of errors from external dependencies and includes with
-`--enable-suppress-external-warnings` and `--config src/.bear-tidy-config`. Both
-options may be omitted to view the full list of errors.
+The output is denoised of errors from external dependencies.
 
 To run clang-tidy on all source files: