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Fix undefined behavior in UDL macro

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`FMT_USE_USER_DEFINED_LITERALS` macro expands to `defined()` which is undefined behavior.
This commit is contained in:
Lee, Byoung-young 2017-07-12 11:01:58 +09:00 committed by Victor Zverovich
parent 4045d7fea2
commit 3028344380
1 changed files with 5 additions and 2 deletions
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7
fmt/format.h
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@ -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