xhochy opened a new pull request #7286:
URL: https://github.com/apache/arrow/pull/7286
When linking the tests with `clang-4.0`, I get
```
Undefined symbols for architecture x86_64:
"arrow::internal::(anonymous
namespace)::StringToFloatConverterImpl::main_junk_value_", referenced from:
arrow::internal::StringToFloat(char const*, unsigned long, float*) in
libarrow.a(value_parsing.cc.o)
arrow::internal::StringToFloat(char const*, unsigned long, double*) in
libarrow.a(value_parsing.cc.o)
"arrow::internal::(anonymous
namespace)::StringToFloatConverterImpl::fallback_junk_value_", referenced from:
arrow::internal::StringToFloat(char const*, unsigned long, float*) in
libarrow.a(value_parsing.cc.o)
arrow::internal::StringToFloat(char const*, unsigned long, double*) in
libarrow.a(value_parsing.cc.o)
ld: symbol(s) not found for architecture x86_64
```
These older clang versions need an explicit implementation definition.
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