From 549fe860907840122ab940091842cd72c547c17e Mon Sep 17 00:00:00 2001
From: mflehmig <martin.schroschk@tu-dresden.de>
Date: Fri, 5 Jul 2019 12:49:22 +0200
Subject: [PATCH] Add support for parallel Jacobian evaluation

- Parallel Jacobian evaluation will be encapsulated by USE_PARJAC defines.
- Enable parallel Jacobian evaluation passing --enable-parjac to
OMCompiler/configure, which will check for OpenMP support and add
corresponding Flags to simulation makefile and c runtime makefile.
---
 OMCompiler/SimulationRuntime/c/Makefile.in | 11 ++++++++++
 OMCompiler/configure.ac                    | 24 ++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/OMCompiler/SimulationRuntime/c/Makefile.in b/OMCompiler/SimulationRuntime/c/Makefile.in
index 774c9df222a..5cca7489fb5 100644
--- a/OMCompiler/SimulationRuntime/c/Makefile.in
+++ b/OMCompiler/SimulationRuntime/c/Makefile.in
@@ -14,6 +14,10 @@ CC = @CC@
 CXX = @CXX@
 CONFIG_CPPFLAGS = @CPPFLAGS@
 CXXFLAGS = @CXXFLAGS@
+OMPCC = @CC@ @OMPCFLAGS@
+OMPCFLAGS=@OMPCFLAGS@
+
+
 ifeq ($(OMC_MINIMAL_RUNTIME),)
 IPOPT_CFLAGS=@IPOPT_CFLAGS@
 else
@@ -31,6 +35,13 @@ LDFLAGS=-L$(OMBUILDDIR)/lib/@host_short@/omc @RT_LDFLAGS@
 LDFLAGS_SIM=-L$(OMBUILDDIR)/lib/@host_short@/omc @RT_LDFLAGS_SIM@
 endif
 
+USE_PARJAC = @USE_PARJAC@
+ifeq (@USE_PARJAC@,yes)
+	CONFIG_CFLAGS+=@OMPCFLAGS@ -DUSE_PARJAC
+	LDFLAGS+=@OMPCFLAGS@
+else
+	OMPCFLAGS=
+endif
 defaultMakefileTarget = Makefile
 
 LIBMAKEFILE = Makefile
diff --git a/OMCompiler/configure.ac b/OMCompiler/configure.ac
index dbd52b10420..d3dcdd77da2 100644
--- a/OMCompiler/configure.ac
+++ b/OMCompiler/configure.ac
@@ -468,6 +468,30 @@ AC_MSG_RESULT([$RUNTIMECFLAGS])
 CC="$CC_OLD"
 CFLAGS="$CFLAGS_OLD"
 
+dnl Parallel Jacobian evaluation in C runtime
+dnl OpenMP needs to be available
+dnl If enabled, model needs to be compiled using -DUSE_PARJAC (add to RUNTIMECFLAGS)
+AC_ARG_ENABLE(
+  [parjac],
+  AS_HELP_STRING([--enable-parjac],
+                 [enable parallel symbolical Jacobian evaluation in C runtime]),
+  [want_parjac=$enableval],
+  [want_parjac=no]
+)
+USE_PARJAC="no"
+if test x$want_parjac = xyes; then
+  AC_MSG_CHECKING([for parallel Jacobian evaluation])
+  if test "$CONFIG_WITH_OPENMP=1"; then
+    USE_PARJAC="yes"
+    RUNTIMECFLAGS="$RUNTIMECFLAGS $OMPCFLAGS -DUSE_PARJAC"
+  else
+    AC_MSG_WARN([========= OpenMP is not available, not define par. jac])
+  fi
+fi
+AC_MSG_RESULT([$USE_PARJAC])
+AC_SUBST(USE_PARJAC)
+
+
 LIBS=""
 AC_SEARCH_LIBS(dlopen,dl)
 LIBDL="$LIBS"