[llvm-bugs] [Bug 44235] New: Project xgboost fails to compile when SkipFunctionBodies is specified

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44235

            Bug ID: 44235
           Summary: Project xgboost fails to compile when
                    SkipFunctionBodies is specified
           Product: clang
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: igor.bronstein at gmail.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

Created attachment 22905
  --> https://bugs.llvm.org/attachment.cgi?id=22905&action=edit
Minimal ASTFrontendAction example

Our tool uses ASTFrontendAction/ASTConsumer to analyze C/C++ projects.
Sometimes we specify `SkipFunctionBodies` to optimize the process. I'm
attaching `clang_tool.cpp`, a minimal example that models what's happening.

Unfortunately `xgboost` fails to compile when `SkipFunctionBodies` is `true`:

```
src/metric/elementwise_metric.cc:7:
In file included from src/metric/elementwise_metric.cu:8:
In file included from include/xgboost/metric.h:16:
include/xgboost/./data.h:204:22: error: unexpected OpenMP directive '#pragma
omp parallel for'
#pragma omp parallel for schedule(static)
                     ^
include/xgboost/./data.h:205:5: error: expected member name or ';' after
declaration specifiers
    for (long i = 0; i < batch_size; ++i) {  // NOLINT(*)
    ^
include/xgboost/./data.h:213:22: error: unexpected OpenMP directive '#pragma
omp parallel for'
#pragma omp parallel for schedule(static)
                     ^
include/xgboost/./data.h:214:5: error: expected member name or ';' after
declaration specifiers
    for (long i = 0; i < batch_size; ++i) {  // NOLINT(*)
    ^
include/xgboost/./data.h:225:4: error: expected ';' after class
  }
   ^
   ;
include/xgboost/./data.h:229:22: error: unexpected OpenMP directive '#pragma
omp parallel for'
#pragma omp parallel for schedule(dynamic, 1)
                     ^
include/xgboost/./data.h:230:5: error: expected unqualified-id
    for (bst_omp_uint i = 0; i < ncol; ++i) {
    ^
include/xgboost/./data.h:264:26: error: unknown type name 'SparsePage'; did you
mean 'xgboost::SparsePage'?
  inline void Push(const SparsePage &batch) {
                         ^~~~~~~~~~
                         xgboost::SparsePage
include/xgboost/./data.h:156:7: note: 'xgboost::SparsePage' declared here
class SparsePage {
      ^
include/xgboost/./data.h:284:26: error: unknown type name 'Inst'
  inline void Push(const Inst &inst) {
                         ^
xgboost/include/xgboost/./data.h:298:1: error: extraneous closing brace ('}')
};
^
include/xgboost/./data.h:304:17: error: unknown type name 'SparsePage'; did you
mean 'xgboost::SparsePage'?
  virtual const SparsePage& operator*() const = 0;
                ^~~~~~~~~~
                xgboost::SparsePage
include/xgboost/./data.h:156:7: note: 'xgboost::SparsePage' declared here
class SparsePage { 
```

There are similar errors for all the source files which include the affected
header file. I have an archive with `xgboost` and its dependencies, but I guess
it exceeds file size limit for this bug tracker.

Anyway I will be glad to provide you with any further information.

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