https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81486
Ted Lyngmo <ted at lyncon dot se> changed:
What |Removed |Added
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CC| |ted at lyncon dot se
--- Comment #3 from Ted Lyngmo <ted at lyncon dot se> ---
A comparison between g++ 8.2 and clang++ 6.0.1
g++ -fsanitize=undefined -std=c++17 -Wall -Wextra -Wshadow -Weffc++ -pedantic
-pedantic-errors -Wc++14-compat -Wc++17-compat -c test.cpp
clang++ -fsanitize=undefined -std=c++17 -Wall -Wextra -Wshadow -Weffc++
-pedantic -pedantic-errors -Wc++14-compat -Wc++17-compat -c test.cpp
#include <functional>
std::less lt_g;
std::greater gt_g;
// ok in g++ 8.2
// clang++ 6.0.1:
// error: declaration of variable 'lt' with deduced type 'std::less' requires
an initializer
// error: declaration of variable 'gt' with deduced type 'std::greater'
requires an initializer
auto lt_c = std::less();
auto gt_c = std::greater();
// ok in clang++ 6.0.1
// g++ 8.2:
// error: cannot deduce template arguments for ‘less’ from ()
// error: cannot deduce template arguments for ‘greater’ from ()
auto lt_b = std::less{};
auto gt_b = std::greater{};
// ok in both
