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2 changes: 2 additions & 0 deletions include/ProgramOptions.hxx
Original file line number Diff line number Diff line change
Expand Up @@ -254,7 +254,9 @@ namespace po {
inline bool case_insensitive_eq(char x, char y) {
if(x == y)
return true;
#ifndef __CHAR_UNSIGNED__
if(x >= 0 && y >= 0)
#endif
if(std::tolower(x) == std::tolower(y))
return true;
return false;
Expand Down