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Fix undefined behavior in UDL macro #542

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Jul 13, 2017
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Fix undefined behavior in UDL macro #542

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Fix undefined behavior in UDL macro 
`FMT_USE_USER_DEFINED_LITERALS` macro expands to `defined()` which is undefined behavior.
@bylee20
bylee20 authored Jul 12, 2017

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vespian Paweł Rozlach
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commit 6cc61c8269f061a20d850bff73673881ac983890
7 changes: 5 additions & 2 deletions fmt/format.h
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Original file line number Diff line number Diff line change
@@ -266,11 +266,14 @@ typedef __int64 intmax_t;
// makes the fmt::literals implementation easier. However, an explicit check
// for variadic templates is added here just in case.
// For Intel's compiler both it and the system gcc/msc must support UDLs.
# define FMT_USE_USER_DEFINED_LITERALS \
FMT_USE_VARIADIC_TEMPLATES && FMT_USE_RVALUE_REFERENCES && \
# if FMT_USE_VARIADIC_TEMPLATES && FMT_USE_RVALUE_REFERENCES && \
(FMT_HAS_FEATURE(cxx_user_literals) || \
(FMT_GCC_VERSION >= 407 && FMT_HAS_GXX_CXX11) || FMT_MSC_VER >= 1900) && \
(!defined(FMT_ICC_VERSION) || FMT_ICC_VERSION >= 1500)
# define FMT_USE_USER_DEFINED_LITERALS 1
# else
# define FMT_USE_USER_DEFINED_LITERALS 0
# endif
#endif

#ifndef FMT_USE_EXTERN_TEMPLATES