[clang-format] Don't sort qualifiers across preprocessor directives (#81958)

Fixes #80579.

2 files changed, 15 insertions, 0 deletions

diff --git a/clang/lib/Format/QualifierAlignmentFixer.cpp b/clang/lib/Format/QualifierAlignmentFixer.cpp
index 8494174..0c63d33 100644
--- a/clang/lib/Format/QualifierAlignmentFixer.cpp
+++ b/clang/lib/Format/QualifierAlignmentFixer.cpp
@@ -561,6 +561,8 @@ void LeftRightQualifierAlignmentFixer::fixQualifierAlignment(
 
     for (const auto *Tok = First; Tok && Tok != Last && Tok->Next;
          Tok = Tok->Next) {
+      if (Tok->MustBreakBefore)
+        break;
       if (Tok->is(tok::comment))
         continue;
       if (RightAlign) {
diff --git a/clang/unittests/Format/QualifierFixerTest.cpp b/clang/unittests/Format/QualifierFixerTest.cpp
index 0aa755a..43476ae 100644
--- a/clang/unittests/Format/QualifierFixerTest.cpp
+++ b/clang/unittests/Format/QualifierFixerTest.cpp
@@ -1177,6 +1177,19 @@ TEST_F(QualifierFixerTest, DontPushQualifierThroughNonSpecifiedTypes) {
   verifyFormat("const inline static Foo;", Style);
 }
 
+TEST_F(QualifierFixerTest, QualifiersBrokenUpByPPDirectives) {
+  auto Style = getLLVMStyle();
+  Style.QualifierAlignment = FormatStyle::QAS_Custom;
+  Style.QualifierOrder = {"constexpr", "inline", "type"};
+
+  verifyFormat("inline\n"
+               "#if FOO\n"
+               "    constexpr\n"
+               "#endif\n"
+               "    int i = 0;",
+               Style);
+}
+
 TEST_F(QualifierFixerTest, UnsignedQualifier) {
 
   FormatStyle Style = getLLVMStyle();