[libc++][NFC] Removed unsupported compilers from tests (#166403)

Author: H-G-Hristov

libcxx/test/std/atomics/atomics.types.generic/cas_non_power_of_2.pass.cpp

@@ -9,7 +9,7 @@
 // https://github.com/llvm/llvm-project/issues/30023
 // compare exchange does not work with types of which the size is not a power of 2
 
-// XFAIL: clang-19, clang-20, clang-21, apple-clang-15, apple-clang-16, apple-clang-17
+// XFAIL: clang-20, clang-21, apple-clang-17
 // UNSUPPORTED: c++03
 
 // TODO: remove the UNSUPPORTED clang-22 once libc++ CI's clang is updated to include

libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array.pass.cpp

@@ -11,7 +11,6 @@
 // UNSUPPORTED: c++03, c++11
 
 // These compiler versions and platforms don't enable sized deallocation by default.
-// ADDITIONAL_COMPILE_FLAGS(apple-clang-16): -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS(apple-clang-17): -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS(target=x86_64-w64-windows-gnu): -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS(target=i686-w64-windows-gnu): -fsized-deallocation

libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete.pass.cpp

@@ -11,7 +11,6 @@
 // UNSUPPORTED: c++03, c++11
 
 // These compiler versions and platforms don't enable sized deallocation by default.
-// ADDITIONAL_COMPILE_FLAGS(apple-clang-16): -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS(apple-clang-17): -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS(target=x86_64-w64-windows-gnu): -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS(target=i686-w64-windows-gnu): -fsized-deallocation

libcxx/test/std/numerics/c.math/signbit.pass.cpp

@@ -12,7 +12,7 @@
 // UNSUPPORTED: windows
 
 // These compilers don't support constexpr `__builtin_signbit` yet.
-// UNSUPPORTED: clang-19, apple-clang-16, apple-clang-17
+// UNSUPPORTED: apple-clang-17
 
 // GCC warns about signbit comparing `bool_v < 0`, which we're testing
 // ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-bool-compare

libcxx/test/std/numerics/numeric.ops/numeric.ops.sat/add_sat.pass.cpp

@@ -8,9 +8,6 @@
 
 // REQUIRES: std-at-least-c++26
 
-// The test uses "Placeholder variables with no name"
-// UNSUPPORTED: apple-clang-16
-
 // <numeric>
 
 // template<class T>

libcxx/test/std/numerics/numeric.ops/numeric.ops.sat/div_sat.pass.cpp

@@ -8,9 +8,6 @@
 
 // REQUIRES: std-at-least-c++26
 
-// The test uses "Placeholder variables with no name"
-// UNSUPPORTED: apple-clang-16
-
 // <numeric>
 
 // template<class T>

libcxx/test/std/numerics/numeric.ops/numeric.ops.sat/mul_sat.pass.cpp

@@ -8,9 +8,6 @@
 
 // REQUIRES: std-at-least-c++26
 
-// The test uses "Placeholder variables with no name"
-// UNSUPPORTED: apple-clang-16
-
 // <numeric>
 
 // template<class T>

libcxx/test/std/numerics/numeric.ops/numeric.ops.sat/saturate_cast.pass.cpp

@@ -8,9 +8,6 @@
 
 // REQUIRES: std-at-least-c++26
 
-// The test uses "Placeholder variables with no name"
-// UNSUPPORTED: apple-clang-16
-
 // <numeric>
 
 // template<class R, class T>

libcxx/test/std/numerics/numeric.ops/numeric.ops.sat/sub_sat.pass.cpp

@@ -8,9 +8,6 @@
 
 // REQUIRES: std-at-least-c++26
 
-// The test uses "Placeholder variables with no name"
-// UNSUPPORTED: apple-clang-16
-
 // <numeric>
 
 // template<class T>

libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/shared_ptr_array.pass.cpp

@@ -10,7 +10,6 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 
 // These compiler versions and platforms don't enable sized deallocation by default.
-// ADDITIONAL_COMPILE_FLAGS(apple-clang-16): -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS(target=x86_64-w64-windows-gnu): -fsized-deallocation
 // ADDITIONAL_COMPILE_FLAGS(target=i686-w64-windows-gnu): -fsized-deallocation