[clang] [clang-format] Option to ignore PP directives (PR #70338)

[Björn Schäpers via cfe-commits]

================
@@ -24153,6 +24153,53 @@ TEST_F(FormatTest, WhitespaceSensitiveMacros) {
   verifyNoChange("FOO(String-ized&Messy+But: :Still=Intentional);", Style);
 }
 
+TEST_F(FormatTest, IgnorePPDefinitions) {
+  FormatStyle Style = getLLVMStyle();
+  Style.IgnorePPDefinitions = true;
+
+  verifyNoChange("#define  A", Style);
+  verifyNoChange("#define A   b", Style);
+  verifyNoChange("#define A  (  args   )", Style);
+  verifyNoChange("#define A  (  args   )  =  func  (  args  )", Style);
+
+  verifyNoChange("#define A x:", Style);
+  verifyNoChange("#define A a. b", Style);
+    
+  // Surrounded with formatted code
+  verifyFormat("int a;\n"
+               "#define  A  a\n"
+               "int a;",
+               "int  a ;\n"
+               "#define  A  a\n"
+               "int  a ;",
+               Style);
+    
+  // Columns are not broken when a limit is set
+  Style.ColumnLimit = 10;
+  verifyNoChange("#define A a a a a", Style);
+  Style.ColumnLimit = 0;
+    
+  // Multiline definition
+  verifyNoChange("#define A \\\n"
+                 "Line one with spaces  .  \\\n"
+                 " Line two.",
+                   Style);
+  verifyNoChange("#define A \\\n"
+                 "a a \\\n"
+                 "a        \\\na",
----------------
HazardyKnusperkeks wrote:

```suggestion
                 "a        \\\n"
                 "a",
```

For easier reading.

https://github.com/llvm/llvm-project/pull/70338