https://bugs.llvm.org/show_bug.cgi?id=51609
Bug ID: 51609
Summary: Error when passing 0 args to a variadic macro
parameters with `-std=c++20 -pedantic-errors`
Product: clang
Version: 12.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: blck...@inbox.ru
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
Starting from C++20, it's allowed to pass 0 arguments to the variadic macro
parameter.
I.e. following should be allowed:
#define FOO(x, ...)
FOO(42)
Clang successfully compiles it by default, but if you add `-std=c++20
-pedantic-errors`, it starts (incorrectly) complaining:
error: must specify at least one argument for '...' parameter of variadic
macro [-Werror,-Wgnu-zero-variadic-macro-arguments]
`-pedantic-errors` should only enable this diagnostic in C++17 and earlier.
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