Add build time error for missing OpenMP

cp2k · Dec 28, 2020 · 7e00210 · 7e00210
1 parent 7c2fe69
commit 7e00210
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Showing 4 changed files with 10 additions and 1 deletion.
diff --git a/arch/Linux-x86-64-gfortran.dumpast b/arch/Linux-x86-64-gfortran.dumpast
@@ -10,6 +10,7 @@ AR       = ar -r
 
 DFLAGS   =
 FCFLAGS  = -O0 -fstrict-aliasing -fbacktrace -g -fbounds-check -ffree-form -fdump-fortran-original -fopenmp $(DFLAGS) 
+CFLAGS   = -fopenmp $(DFLAGS)
 LDFLAGS  = $(FCFLAGS)
 LIBS     = -llapack -lblas 
 

diff --git a/src/base/base_uses.f90 b/src/base/base_uses.f90
@@ -12,6 +12,10 @@
                                              timeset,&
                                              timestop
 
+! Check for OpenMP early on - ideally before the compiler fails with a cryptic message.
+#if !defined(_OPENMP)
+   "OpenMP is required. Please add -fopenmp to your Fortran compiler flags."
+#endif
 
 ! Dangerous: Full path can be arbitrarily long and might overflow Fortran line.
 #if !defined(__SHORT_FILE__)

diff --git a/src/grid/common/grid_library.c b/src/grid/common/grid_library.c
@@ -24,6 +24,10 @@ static grid_library_config config = {.backend = GRID_BACKEND_AUTO,
                                      .apply_cutoff = false,
                                      .queue_length = 8192};
 
+#if !defined(_OPENMP)
+#error "OpenMP is required. Please add -fopenmp to your C compiler flags."
+#endif
+
 /*******************************************************************************
  * \brief Initializes the grid library.
  * \author Ole Schuett

diff --git a/tools/conventions/analyze_src.py b/tools/conventions/analyze_src.py
@@ -11,7 +11,7 @@
 
 flag_exceptions_re = re.compile(
     r"__COMPILE_REVISION|__COMPILE_DATE|__COMPILE_ARCH|__COMPILE_HOST|CUDA_VERSION|"
-    r"__INTEL_COMPILER|__cplusplus|\$\{.*\}\$|__.*__"
+    r"__INTEL_COMPILER|__cplusplus|_OPENMP|\$\{.*\}\$|__.*__"
 )
 
 portable_filename_re = re.compile(r"^[a-zA-Z0-9._/#~=+-]*$")