[llvm-bugs] [Bug 38712] New: Cannot build openmp project using gcc after r340542

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38712

            Bug ID: 38712
           Summary: Cannot build openmp project using gcc after r340542
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: ilia.taraban at intel.com
                CC: llvm-bugs at lists.llvm.org

After this commit:

------------------------------------------------------------------------
r340542 | alexeichenberger | 2018-08-23 18:22:42 +0200 (Thu, 23 Aug 2018) | 13
lines

[OpenMP][libomptarget] Bringing up to spec with respect to OMP_TARGET_OFFLOAD
env var

Summary:
Right now, only the OMP_TARGET_OFFLOAD=DISABLED was implemented. Added support
for the other MANDATORY and DEFAULT values.


Reviewers: gtbercea, ABataev, grokos, caomhin, Hahnfeld

Reviewed By: Hahnfeld

Subscribers: protze.joachim, gtbercea, AlexEichenberger, RaviNarayanaswamy,
Hahnfeld, guansong, openmp-commits

Differential Revision: https://reviews.llvm.org/D50522
------------------------------------------------------------------------

In simple build I receive errors like:
------------------------------------------------------------------------
$ cd $BUILDS_DIR/build/projects/openmp/libomptarget/src && /usr/bin/c++  
-D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
-D__STDC_LIMIT_MACROS -Domptarget_EXPORTS
-I$BUILDS_DIR/build/projects/openmp/libomptarget/src
-I$BUILDS_DIR/llvm/projects/openmp/libomptarget/src -I/usr/include/libxml2
-I$BUILDS_DIR/build/include -I$BUILDS_DIR/llvm/include
-I$BUILDS_DIR/llvm/projects/openmp/libomptarget/include  -fPIC
-fvisibility-inlines-hidden -std=c++11 -Wall -Wextra -Wno-unused-parameter
-Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic
-Wno-long-long -Wno-maybe-uninitialized -Wdelete-non-virtual-dtor -Wno-comment
-ffunction-sections -fdata-sections -std=c++11 -O3 -DNDEBUG -fPIC   -o
CMakeFiles/omptarget.dir/omptarget.cpp.o -c
$BUILDS_DIR/llvm/projects/openmp/libomptarget/src/omptarget.cpp
$BUILDS_DIR/llvm/projects/openmp/libomptarget/src/omptarget.cpp: In function
'void FatalMessage(int, const char*, ...)':
$BUILDS_DIR/llvm/projects/openmp/libomptarget/src/omptarget.cpp:37:21: error:
'va_start' was not declared in this scope
   va_start(args, fmt);
                     ^
$BUILDS_DIR/llvm/projects/openmp/libomptarget/src/omptarget.cpp:43:14: error:
'va_end' was not declared in this scope
   va_end(args);
              ^
------------------------------------------------------------------------

I have same errors using different gcc versions: 4.8.5, 5.5.0, 6, 7 and 8.

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