Build lpsolve55 if it is not found

Belonging to [master]:
  - OpenModelica/OMCompiler#2443

Makefile.in

@@ -68,6 +68,7 @@ LIBMODELICAIO=@OMBUILDDIR@/lib/@host_short@/omc/libModelicaIO@SHREXT@
 LIBMODELICAMATIO=@OMBUILDDIR@/lib/@host_short@/omc/libModelicaMatIO@SHREXT@
 OMENCRYPTION=@OMENCRYPTION@
 LVE_EXE_SUFFIX=@MODELICA_SPEC_PLATFORM@
+MINGW_EXTRA_LIBS=@MINGW_EXTRA_LIBS@
 
 SUITESPARSE_LIBS = -DKLU_LIBRARY="libklu$(SHREXT)" -DAMD_LIBRARY="libamd$(SHREXT)" -DCOLAMD_LIBRARY="libcolamd$(SHREXT)" -DBTF_LIBRARY="libbtf$(SHREXT)"
 

configure.ac

@@ -95,6 +95,7 @@ AC_SUBST(BOOST_INCLUDE)
 AC_SUBST(LDFLAGS_LIBSTDCXX)
 AC_SUBST(CPP_RUNTIME_ARGS)
 AC_SUBST(OMENCRYPTION)
+AC_SUBST(MINGW_EXTRA_LIBS)
 
 FINAL_MESSAGES="\nConfigured OpenModelica successfully using the following options:"
 
@@ -467,7 +468,7 @@ if test "$WANT_STATIC_LPSOLVE" = "no"; then
   LIBDL="$LIBS"
   AC_SEARCH_LIBS(sqrt,m)
   AC_SEARCH_LIBS(colamd,colamd)
-  AC_SEARCH_LIBS(make_lp,[lpsolve55_pic lpsolve55],[LIBLPSOLVE55=$LIBS],[MINGW_EXTRA_LIBS="$MINGW_EXTRA_LIBS lpsolve"; AC_MSG_RESULT([lpsolve linking failed using $LIBS])])
+  AC_SEARCH_LIBS(make_lp,[lpsolve55_pic lpsolve55],[LIBLPSOLVE55=$LIBS],[COMPILE_LPSOLVE=1])
   LIBS=""
 else
   if test "$WANT_STATIC_LPSOLVE" = "yes"; then
@@ -480,19 +481,27 @@ else
   AC_SEARCH_LIBS(sqrt,m)
   LIBS="$LPLIB/liblpsolve55_pic.a $LPLIB/libcolamd.a $LIBS"
   AC_MSG_CHECKING([for static lpsolve55])
-  AC_LINK_IFELSE([AC_LANG_CALL([], [make_lp])], [LIBLPSOLVE55=$LIBS], [MINGW_EXTRA_LIBS="$MINGW_EXTRA_LIBS lpsolve"; AC_MSG_RESULT([failed])])
+  AC_LINK_IFELSE([AC_LANG_CALL([], [make_lp])], [LIBLPSOLVE55=$LIBS], [COMPILE_LPSOLVE="1"])
   AC_MSG_RESULT([$LIBLPSOLVE55])
   LIBS=""
 fi
 AC_CHECK_HEADER([lp_lib.h],[LPSOLVEINC=lp_lib.h],[
   AC_CHECK_HEADER([lpsolve/lp_lib.h],[LPSOLVEINC=lpsolve/lp_lib.h],[
-    if ! ( echo $MINGW_EXTRA_LIBS | grep -q lpsolve ); then
-      MINGW_EXTRA_LIBS="$MINGW_EXTRA_LIBS lpsolve";
-    fi
-    AC_MSG_RESULT([failed to find lpsolve55 headers])
+    COMPILE_LPSOLVE=1
   ])
 ])
 
+if test "$COMPILE_LPSOLVE" = 1; then
+  MINGW_EXTRA_LIBS="$MINGW_EXTRA_LIBS lpsolve";
+  AC_MSG_RESULT([failed to find lpsolve55 headers or library; will compile them ourselves])
+  LPSOLVEINC="$ac_pwd/3rdParty/lpsolve/build/include/lpsolve/lp_lib.h"
+  if test "$WANT_STATIC_LPSOLVE" = "yes"; then
+    LIBLPSOLVE55="-Wl,-Bstatic -llpsolve55 -Wl,-Bdynamic"
+  else
+    LIBLPSOLVE55="-llpsolve55"
+  fi
+fi
+
 fi # NO_LPLIB
 
 if ! (echo "$host" | grep -q "mingw"); then