Add diag group

Author: MacDue

clang/include/clang/Basic/DiagnosticDriverKinds.td

@@ -504,7 +504,8 @@ def warn_drv_large_data_threshold_invalid_code_model: Warning<
   InGroup<UnusedCommandLineArgument>;
 def warn_drv_math_errno_reenabled_after_veclib: Warning<
   "math errno re-enabled by '%0' after it was implicitly disabled by '%1',"
-  " this may prevent vectorization with the specified vector library">;
+  " this may prevent vectorization with the specified vector library">,
+  InGroup<MathErrnoEnabledWithVecLib>;
 
 def note_drv_command_failed_diag_msg : Note<
   "diagnostic msg: %0">;

clang/include/clang/Basic/DiagnosticGroups.td

@@ -125,6 +125,7 @@ def FloatZeroConversion : DiagGroup<"float-zero-conversion">;
 def FloatConversion :
   DiagGroup<"float-conversion", [FloatOverflowConversion,
                                  FloatZeroConversion]>;
+def MathErrnoEnabledWithVecLib : DiagGroup<"math-errno-enabled-with-veclib">;
 
 def FrameAddress : DiagGroup<"frame-address">;
 def FreeNonHeapObject : DiagGroup<"free-nonheap-object">;

clang/test/Driver/fveclib.c

@@ -76,21 +76,25 @@
 // CHECK-ERRNO-ARMPL-NOT: "-fmath-errno"
 
 // RUN: %clang -### --target=aarch64-linux-gnu -fveclib=ArmPL -fmath-errno %s 2>&1 | FileCheck --check-prefix=CHECK-REENABLE-ERRNO-ARMPL %s
-// CHECK-REENABLE-ERRNO-ARMPL: math errno re-enabled by '-fmath-errno' after it was implicitly disabled by '-fveclib=ArmPL', this may prevent vectorization with the specified vector library
+// CHECK-REENABLE-ERRNO-ARMPL: math errno re-enabled by '-fmath-errno' after it was implicitly disabled by '-fveclib=ArmPL', this may prevent vectorization with the specified vector library [-Wmath-errno-enabled-with-veclib]
+
 // CHECK-REENABLE-ERRNO-ARMPL: "-fveclib=ArmPL"
 // CHECK-REENABLE-ERRNO-ARMPL-SAME: "-fmath-errno"
 
 // RUN: %clang -### --target=aarch64-linux-gnu -fveclib=SLEEF -fmath-errno %s 2>&1 | FileCheck --check-prefix=CHECK-REENABLE-ERRNO-SLEEF %s
-// CHECK-REENABLE-ERRNO-SLEEF: math errno re-enabled by '-fmath-errno' after it was implicitly disabled by '-fveclib=SLEEF', this may prevent vectorization with the specified vector library
+// CHECK-REENABLE-ERRNO-SLEEF: math errno re-enabled by '-fmath-errno' after it was implicitly disabled by '-fveclib=SLEEF', this may prevent vectorization with the specified vector library [-Wmath-errno-enabled-with-veclib]
+
 // CHECK-REENABLE-ERRNO-SLEEF: "-fveclib=SLEEF"
 // CHECK-REENABLE-ERRNO-SLEEF-SAME: "-fmath-errno"
 
 // RUN: %clang -### --target=aarch64-linux-gnu -fveclib=ArmPL -fno-fast-math %s 2>&1 | FileCheck --check-prefix=CHECK-REENABLE-ERRNO-NFM %s
-// CHECK-REENABLE-ERRNO-NFM: math errno re-enabled by '-fno-fast-math' after it was implicitly disabled by '-fveclib=ArmPL', this may prevent vectorization with the specified vector library
+// CHECK-REENABLE-ERRNO-NFM: math errno re-enabled by '-fno-fast-math' after it was implicitly disabled by '-fveclib=ArmPL', this may prevent vectorization with the specified vector library [-Wmath-errno-enabled-with-veclib]
+
 // CHECK-REENABLE-ERRNO-NFM: "-fveclib=ArmPL"
 // CHECK-REENABLE-ERRNO-NFM-SAME: "-fmath-errno"
 
 // RUN: %clang -### --target=aarch64-linux-gnu -fveclib=ArmPL -ffp-model=strict %s 2>&1 | FileCheck --check-prefix=CHECK-REENABLE-ERRNO-FP-MODEL %s
-// CHECK-REENABLE-ERRNO-FP-MODEL: math errno re-enabled by '-ffp-model=strict' after it was implicitly disabled by '-fveclib=ArmPL', this may prevent vectorization with the specified vector library
+// CHECK-REENABLE-ERRNO-FP-MODEL: math errno re-enabled by '-ffp-model=strict' after it was implicitly disabled by '-fveclib=ArmPL', this may prevent vectorization with the specified vector library [-Wmath-errno-enabled-with-veclib]
+
 // CHECK-REENABLE-ERRNO-FP-MODEL: "-fveclib=ArmPL"
 // CHECK-REENABLE-ERRNO-FP-MODEL-SAME: "-fmath-errno"