1 files changed, 108 insertions, 0 deletions
diff --git a/tests/t0052-warning-control.sh b/tests/t0052-warning-control.sh
new file mode 100755
index 0000000..8214d96
--- /dev/null
+++ b/tests/t0052-warning-control.sh
@@ -0,0 +1,108 @@
+#!/bin/sh
+set -eu
+base="${TMPDIR-/tmp}/mcpu-cpp-warning-control-$$"
+mkdir -p "$base"
+trap 'rm -rf "$base"' EXIT HUP INT TERM
+
+cat > "$base/comments.c" <<'EOT'
+/* outer /* nested */
+// continued \
+comment
+ok
+EOT
+
+# Comment warnings are optional and disabled by default.
+"$MCPU_CPP" --no-config "$base/comments.c" -o "$base/default.out" 2>"$base/default.err"
+test ! -s "$base/default.err"
+grep '^ok$' "$base/default.out" >/dev/null
+
+# -Wcomment and -Wcomments are synonyms.
+for option in -Wcomment -Wcomments -Wall; do
+  "$MCPU_CPP" --no-config "$option" "$base/comments.c" \
+    -o "$base/comment.out" 2>"$base/comment.err"
+  test "`grep -c 'warning: \"/\*\" within comment' "$base/comment.err"`" -eq 1
+  test "`grep -c 'warning: multi-line comment' "$base/comment.err"`" -eq 1
+done
+
+# A specific -Wno-comment is stronger than the -Wall group regardless of order.
+for options in '-Wall -Wno-comment' '-Wno-comment -Wall' \
+               '-Wall -Wno-comments' '-Wno-comments -Wall'; do
+  # shellcheck disable=SC2086
+  "$MCPU_CPP" --no-config $options "$base/comments.c" \
+    -o "$base/no-comment.out" 2>"$base/no-comment.err"
+  test ! -s "$base/no-comment.err"
+done
+
+# Same-specificity comment options use the last occurrence.
+"$MCPU_CPP" --no-config -Wno-comment -Wcomment "$base/comments.c" \
+  -o "$base/comment-last.out" 2>"$base/comment-last.err"
+grep 'warning: multi-line comment' "$base/comment-last.err" >/dev/null
+
+"$MCPU_CPP" --no-config -Wcomment -Wno-comment "$base/comments.c" \
+  -o "$base/no-comment-last.out" 2>"$base/no-comment-last.err"
+test ! -s "$base/no-comment-last.err"
+
+# -Werror does not enable optional comment diagnostics by itself.
+"$MCPU_CPP" --no-config -Werror "$base/comments.c" \
+  -o "$base/werror-only.out" 2>"$base/werror-only.err"
+test ! -s "$base/werror-only.err"
+
+# When comment diagnostics are enabled, -Werror promotes them to errors.
+if "$MCPU_CPP" --no-config -Wcomment -Werror "$base/comments.c" \
+     -o "$base/comment-error.out" 2>"$base/comment-error.err"; then
+  echo '-Wcomment -Werror did not fail' >&2
+  exit 1
+fi
+grep 'error: "/\*" within comment' "$base/comment-error.err" >/dev/null
+
+# -Werror/-Wno-error have equal specificity; the last occurrence wins.
+cat > "$base/directive.c" <<'EOT'
+#warning requested warning
+ok
+EOT
+"$MCPU_CPP" --no-config -Werror -Wno-error "$base/directive.c" \
+  -o "$base/no-error.out" 2>"$base/no-error.err"
+grep 'warning: #warning requested warning$' "$base/no-error.err" >/dev/null
+
+if "$MCPU_CPP" --no-config -Wno-error -Werror "$base/directive.c" \
+     -o "$base/error-last.out" 2>"$base/error-last.err"; then
+  echo '-Wno-error -Werror did not fail' >&2
+  exit 1
+fi
+grep 'error: #warning requested warning$' "$base/error-last.err" >/dev/null
+
+# Existing always-issued warnings are also promoted by -Werror.
+cat > "$base/width.c" <<'EOT'
+#if 1z24 == 1
+ok
+#endif
+EOT
+if "$MCPU_CPP" --no-config -Werror "$base/width.c" \
+     -o "$base/width.out" 2>"$base/width.err"; then
+  echo 'zNNN warning was not promoted by -Werror' >&2
+  exit 1
+fi
+grep 'error: invalid zNNN integer-width suffix; suffix ignored$' "$base/width.err" >/dev/null
+
+cat > "$base/redefine.c" <<'EOT'
+#define VALUE 1
+#define VALUE 2
+EOT
+if "$MCPU_CPP" --no-config -Werror "$base/redefine.c" \
+     -o "$base/redefine.out" 2>"$base/redefine.err"; then
+  echo 'macro redefinition warning was not promoted by -Werror' >&2
+  exit 1
+fi
+grep "error: macro 'VALUE' redefined$" "$base/redefine.err" >/dev/null
+
+cat > "$base/paste.c" <<'EOT'
+#define BAD(X) X ## +
+BAD(foo)
+EOT
+if "$MCPU_CPP" --no-config -Werror "$base/paste.c" \
+     -o "$base/paste.out" 2>"$base/paste.err"; then
+  echo 'invalid paste warning was not promoted by -Werror' >&2
+  exit 1
+fi
+grep 'error: pasting "foo" and "+" does not give a valid preprocessing token$' \
+  "$base/paste.err" >/dev/null