http://llvm.org/bugs/show_bug.cgi?id=12464
Bug #: 12464
Summary: Macro expansion bug when a function-like macro is
redefined in its own arguments.
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
clang does not handle this case from the GNU CPP manual:
http://gcc.gnu.org/onlinedocs/cpp/Directives-Within-Macro-Arguments.html#Directives-Within-Macro-Arguments
#define f(x) x x
f (1
#undef f
#define f 2
f)
This expand to the following using gcc -E:
1 2 1 2
But instead clang sees this as an error and doesn't expand the macro:
function_arguments_directives.c:2:1: error: too many arguments provided to
function-like macro invocation
f (1
^
f
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