[clang] [clang] move -Wcast-function-type under -Wextra (PR #77178)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Abhin P Jose (Abhinkop)

<details>
<summary>Changes</summary>

This patch is for github issue https://github.com/llvm/llvm-project/issues/76872. 

The -Wcast-fuction-type-strict has been moved under dignstic group -Wextra.
Edited the test cases for -Wcast-fuction-type-strict and -Wcast-fuction-type in Sema an SemaCXX.

Added a new test case which include a functionality that was already in the -Wextra group, i.e -Wignored-qualifiers with -Wcast-fuction-type-strict.


---
Full diff: https://github.com/llvm/llvm-project/pull/77178.diff


6 Files Affected:

- (modified) clang/include/clang/Basic/DiagnosticGroups.td (+1) 
- (modified) clang/test/Sema/warn-cast-function-type-strict.c (+1-1) 
- (modified) clang/test/Sema/warn-cast-function-type.c (+1) 
- (added) clang/test/Sema/warn-extra-cast-function-type-strict.c (+42) 
- (modified) clang/test/SemaCXX/warn-cast-function-type-strict.cpp (+1) 
- (modified) clang/test/SemaCXX/warn-cast-function-type.cpp (+1) 


``````````diff
diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
index 6765721ae7002c..d3e57de8ac7a58 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -1026,6 +1026,7 @@ def Extra : DiagGroup<"extra", [
     EmptyInitStatement,
     StringConcatation,
     FUseLdPath,
+    CastFunctionType,
   ]>;
 
 def Most : DiagGroup<"most", [
diff --git a/clang/test/Sema/warn-cast-function-type-strict.c b/clang/test/Sema/warn-cast-function-type-strict.c
index 5233680796e972..68b49bb0d05d06 100644
--- a/clang/test/Sema/warn-cast-function-type-strict.c
+++ b/clang/test/Sema/warn-cast-function-type-strict.c
@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 %s -fsyntax-only -Wcast-function-type -verify
 // RUN: %clang_cc1 %s -fsyntax-only -Wcast-function-type-strict -verify
-
+// RUN: %clang_cc1 %s -fsyntax-only -Wextra -Wno-ignored-qualifiers -verify
 
 int t(int array[static 12]);
 int u(int i);
diff --git a/clang/test/Sema/warn-cast-function-type.c b/clang/test/Sema/warn-cast-function-type.c
index d7ddcdb73725c0..09d169026b1c86 100644
--- a/clang/test/Sema/warn-cast-function-type.c
+++ b/clang/test/Sema/warn-cast-function-type.c
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 %s -fsyntax-only -Wcast-function-type -Wno-cast-function-type-strict -verify
+// RUN: %clang_cc1 %s -fsyntax-only -Wextra -Wno-cast-function-type-strict -verify
 
 int x(long);
 
diff --git a/clang/test/Sema/warn-extra-cast-function-type-strict.c b/clang/test/Sema/warn-extra-cast-function-type-strict.c
new file mode 100644
index 00000000000000..ef8853616ba832
--- /dev/null
+++ b/clang/test/Sema/warn-extra-cast-function-type-strict.c
@@ -0,0 +1,42 @@
+// RUN: %clang_cc1 %s -fsyntax-only -Wextra -verify
+
+
+int t(int array[static 12]);
+int u(int i);
+const int v(int i); /* expected-warning {{'const' type qualifier on return type has no effec}} */
+int x(long);
+
+typedef int (f1)(long);
+typedef int (f2)(void*);
+typedef int (f3)();
+typedef void (f4)();
+typedef void (f5)(void);
+typedef int (f6)(long, int);
+typedef int (f7)(long,...);
+typedef int (f8)(int *);
+typedef int (f9)(const int);
+typedef int (f10)(int);
+
+f1 *a;
+f2 *b;
+f3 *c;
+f4 *d;
+f5 *e;
+f6 *f;
+f7 *g;
+f8 *h;
+f9 *i;
+f10 *j;
+
+void foo(void) {
+  a = (f1 *)x;
+  b = (f2 *)x; /* expected-warning {{cast from 'int (*)(long)' to 'f2 *' (aka 'int (*)(void *)') converts to incompatible function type}} */
+  c = (f3 *)x; /* expected-warning {{cast from 'int (*)(long)' to 'f3 *' (aka 'int (*)()') converts to incompatible function type}} */
+  d = (f4 *)x; /* expected-warning {{cast from 'int (*)(long)' to 'f4 *' (aka 'void (*)()') converts to incompatible function type}} */
+  e = (f5 *)x; /* expected-warning {{cast from 'int (*)(long)' to 'f5 *' (aka 'void (*)(void)') converts to incompatible function type}} */
+  f = (f6 *)x; /* expected-warning {{cast from 'int (*)(long)' to 'f6 *' (aka 'int (*)(long, int)') converts to incompatible function type}} */
+  g = (f7 *)x; /* expected-warning {{cast from 'int (*)(long)' to 'f7 *' (aka 'int (*)(long, ...)') converts to incompatible function type}} */
+  h = (f8 *)t;
+  i = (f9 *)u;
+  j = (f10 *)v; /* expected-warning {{cast from 'const int (*)(int)' to 'f10 *' (aka 'int (*)(int)') converts to incompatible function type}} */
+}
diff --git a/clang/test/SemaCXX/warn-cast-function-type-strict.cpp b/clang/test/SemaCXX/warn-cast-function-type-strict.cpp
index f7ee55f84ac280..b3164afde5a0ca 100644
--- a/clang/test/SemaCXX/warn-cast-function-type-strict.cpp
+++ b/clang/test/SemaCXX/warn-cast-function-type-strict.cpp
@@ -1,5 +1,6 @@
 // RUN: %clang_cc1 %s -fblocks -fsyntax-only -Wcast-function-type -verify
 // RUN: %clang_cc1 %s -fblocks -fsyntax-only -Wcast-function-type-strict -verify
+// RUN: %clang_cc1 %s -fblocks -fsyntax-only -Wextra -verify
 
 int x(long);
 
diff --git a/clang/test/SemaCXX/warn-cast-function-type.cpp b/clang/test/SemaCXX/warn-cast-function-type.cpp
index c613aaea1e33f2..db2ee030fcbfc9 100644
--- a/clang/test/SemaCXX/warn-cast-function-type.cpp
+++ b/clang/test/SemaCXX/warn-cast-function-type.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 %s -fblocks -fsyntax-only -Wcast-function-type -Wno-cast-function-type-strict -verify
+// RUN: %clang_cc1 %s -fblocks -fsyntax-only -Wextra -Wno-cast-function-type-strict -verify
 
 int x(long);
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/77178