https://llvm.org/bugs/show_bug.cgi?id=26771
Bug ID: 26771
Summary: -frewrite-includes: Lack of an exit line directive in
case of an empty header
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Consider simple case:
empty.cpp:
#include "empty.h"
empty.h has 0-size.
"clang -E -frewrite-includes empty.cpp" produces:
# 1 "<built-in>"
# 1 "empty.cpp"
#if 0 /* expanded by -frewrite-includes */
#include "empty.h"
#endif /* expanded by -frewrite-includes */
# 1 "empty.cpp"
# 1 "./empty.h" 1
# 2 "empty.cpp"
Reading the includes-rewritten source we never exit from empty.h
if empty.h contains something, clang produces:
# 1 "<built-in>"
# 1 "empty.cpp"
#if 0 /* expanded by -frewrite-includes */
#include "empty.h"
#endif /* expanded by -frewrite-includes */
# 1 "empty.cpp"
# 1 "./empty.h" 1
# 2 "empty.cpp" 2
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