Compile with OpenMP, if available

Makefile.am

 AUTOMAKE_OPTIONS = subdir-objects
 ACLOCAL_AMFLAGS = ${ACLOCAL_FLAGS} -I m4
-AM_CFLAGS = @AM_CFLAGS@
-AM_LDFLAGS = -L$(libdir) -Wl,-rpath -Wl,$(libdir) @AM_LDFLAGS@
+AM_CFLAGS = @AM_CFLAGS@ $(OPENMP_CFLAGS)
+AM_LDFLAGS = -L$(libdir) -Wl,-rpath -Wl,$(libdir) @AM_LDFLAGS@ $(OPENMP_CFLAGS)
+AM_FCFLAGS = @AM_FCFLAGS@ $(OPENMP_FCFLAGS)
 
 # libraries
 lib_LTLIBRARIES = libftimings-@FTIMINGS_API_VERSION@-@FC@.la

configure.ac

@@ -6,11 +6,17 @@ AC_CONFIG_HEADERS([config.h])
 
 AM_INIT_AUTOMAKE([foreign -Wall -Werror])
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
+
+AC_LANG([C])
 AM_PROG_CC_C_O
+AC_OPENMP
 
+AC_LANG([Fortran])
 AC_PROG_FC
 AC_FC_LIBRARY_LDFLAGS
 AC_FC_FREEFORM
+AC_OPENMP
+
 
 LT_INIT
 
@@ -19,6 +25,7 @@ PKG_PROG_PKG_CONFIG
 AC_SUBST([FTIMINGS_SO_VERSION], [0:1:0])
 AC_SUBST([FTIMINGS_API_VERSION], [0.1])
 AC_SUBST([AM_CFLAGS])
+AC_SUBST([AM_FCFLAGS])
 AC_SUBST([AM_LDFLAGS])
 
 AC_CONFIG_FILES([Makefile

test/test_timings.F90

@@ -34,12 +34,14 @@ program test_timings
 
     write(*,*) "Iteration", i
     call timer%start("cycle", replace=.true.)
+    !$ call timer%start("parallel")
     !$omp parallel do
-    do j = 1,3
+    do j = 1,30
       call a()
       call b()
     end do
     !$omp end parallel do
+    !$ call timer%stop("parallel")
     call timer%stop("cycle")
 
     if (timer%is_enabled()) then
@@ -55,7 +57,11 @@ program test_timings
       write(*,'(a,f9.6)') "  c part: ", timer%in_entries("c") / timer%get("program", "cycle")
       write(*,'(a,f9.6)') "  b part: ", timer%in_entries("b") / timer%get("program", "cycle")
       write(*,'(a,f9.6)') "  cycle total : ", timer%get("program", "cycle")
+#ifndef _OPENMP
       write(*,'(a,f9.6)') "  cycle -> a -> b -> c : ", timer%get("program", "cycle", "a", "b", "c")
+#else
+      write(*,'(a,f9.6)') "  cycle -> a -> b -> c : ", timer%get("program", "cycle", "parallel", "a", "b", "c")
+#endif
       write(*,*)
     endif
   end do