googlewalt wrote:
This doesn't build with -Werror, as seen in llvm-ci build
https://lab.llvm.org/buildbot/#/builders/145/builds/7332. Can you please take
a look?
```
FAILED:
tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangBuiltinTemplatesEmitter.cpp.o
ccache /home/buildbots/llvm-external-buildbots/clang.19.1.7/bin/clang++
--gcc-toolchain=/gcc-toolchain/usr -DCLANG_EXPORTS -DGTEST_HAS_RTTI=0
-DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/tools/clang/utils/TableGen
-I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/clang/utils/TableGen
-I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/clang/include
-I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/tools/clang/include
-I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/include
-I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/include
-fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror
-Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra
-Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers
-pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough
-Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor
-Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion
-Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color
-ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual
-Wno-nested-anon-types -O3 -DNDEBUG -std=c++17 -fno-exceptions -funwind-tables
-fno-rtti -UNDEBUG -MD -MT
tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangBuiltinTemplatesEmitter.cpp.o
-MF
tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangBuiltinTemplatesEmitter.cpp.o.d
-o
tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangBuiltinTemplatesEmitter.cpp.o
-c
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/clang/utils/TableGen/ClangBuiltinTemplatesEmitter.cpp
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/clang/utils/TableGen/ClangBuiltinTemplatesEmitter.cpp:25:8:
error: 'llvm::StringSet' may not intend to support class template argument
deduction [-Werror,-Wctad-maybe-unsupported]
25 | static llvm::StringSet BuiltinClasses;
| ^
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/include/llvm/ADT/StringSet.h:25:7:
note: add a deduction guide to suppress this warning
25 | class StringSet : public StringMap<std::nullopt_t, AllocatorTy> {
| ^
1 error generated.
```
https://github.com/llvm/llvm-project/pull/134034
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