[llvm-bugs] [Bug 48759] New: pragma omp target causes fopen "fatal error" when compile with preprocessed file

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https://bugs.llvm.org/show_bug.cgi?id=48759

            Bug ID: 48759
           Summary: pragma omp target causes fopen "fatal error" when
                    compile with preprocessed file
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: melanie.blower at intel.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Hello, When I receive a bug report with a preprocessed file, I often do not
receive the original file and the #line markers show the file name belonging to
the customer but not on my server.  When compiling this program, a fatal error
is reported. Evidently the file name is scraped from #line instead of using the
file name used to invoke the compiler.  Here is test case:
 cat newfile-abfeb7.ii
# 1 "nofile.cpp"
void a() {
#pragma omp target
  ;
}

Here's the invocation:

clang-12 -cc1 -triple x86_64-unknown-linux-gnu -emit-llvm-bc -fopenmp
newfile-abfeb7.ii

Response:
fatal error: cannot open file 'nofile.cpp': No such file or directory
1 error generated.


It appears that CGOpenMPRuntime::registerTargetRegion
(CGOpenMPRuntime.cpp:6421) is called from
CodeGenFunction::EmitLateOutlineOMPDirective, which is trying to open thefile
for some reason.  It seems based on the comments to wish to create a unique id
for the ‘target entry’, but it uses the current file’s ‘UniqueID’


(https://github.com/llvm/llvm-project/blob/main/clang/lib/CodeGen/CGOpenMPRuntime.cpp#L1651)

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