[LLVMbugs] [Bug 20553] New: -frewrite-includes loses information about system headers, leading to additional warnings and errors

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20553

            Bug ID: 20553
           Summary: -frewrite-includes loses information about system
                    headers, leading to additional warnings and errors
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Consider:

$ cat x/t.h
int __fastcall f();
$ cat t.c
#include "t.h"
void g() { f(); }
$ clang -c t.c -isystem x -m64 # no warnings
$ clang -c t.c -isystem x -m64 -E -frewrite-includes -o t.ii
$ clang -c t.ii -m64
x\t.h:1:5: warning: calling convention '__fastcall' ignored for this target
[-Wignored-attributes]
int __fastcall f();
    ^
1 warning generated.

This is really annoying when working with crashers on Windows, where system
headers are rife with warnings.

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