https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82335
Bug ID: 82335
Summary: Incorrect _Pragma expansion with in complex macro
expressions
Product: gcc
Version: 5.4.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: pskocik at gmail dot com
Target Milestone: ---
Created attachment 42239
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42239&action=edit
reproducer for "Incorrect _Pragma expansion with in complex macro expressions";
compile with -Wall -Wextra
Basically, _Pragma's expansions (as shown with gcc -E) seem to get shifted out
of some slightly "more complex" macro expressions, which renders them
ineffective.
Attached is one piece of code that reproduces the problem. When compiled with
`-Wall -Wextra`, the warning which should've been silenced isn't, because the
#pragma push-pop pair gets shifted out of the expression.
It's hard to pinpoint exactly what causes this, and the problem goes away with
minor complexity reductions (such as replacing a macro (e.g., the tof macro)
with what it expands to), but it seems to stick in more complex contexts.
clang handles everything fine.
