https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94127
Bug ID: 94127
Summary: #pragma system_header marks unrelated files as system
headers
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: aleksey.covacevice at gmail dot com
Target Milestone: ---
When compiling `x.c` as below:
/* x.c */
#include <sys.h>
#include <usr.h>
/* sys.h */
#pragma GCC system_header
#include "sys2.h"
/* usr.h */
#include "other.h"
/* sys2.h empty */
/* other.h empty */
file "other.h" gets marked as a system header, as per -fdebug-cpp:
{P:./other.h;F:./usr.h;L:1;C:0;S:1;M:0x7f323a64b180;E:0,LOC:260288,R:260288}
^^^
This affects dependency generation with -MMD.
If `sys.h` includes `<sys2.h>` (in angle brackets), or includes nothing at all,
this does not happen. Neither does it happen if `x.c` includes either file with
quotes.
Nothing in the documentation suggests this behavior is intended.
