- handle -Wl,--no-as-needed via configure

Belonging to [master]:
  - #2489

Author: adrpo

Makefile.common

@@ -467,7 +467,7 @@ sundials: umfpack
 	$(MAKE) -f $(defaultMakefileTarget) $(builddir_lib_omc)/libsundials_ida.a
 $(builddir_lib_omc)/libsundials_ida.a: 3rdParty/sundials/CMakeLists.txt
 	mkdir -p 3rdParty/sundials/build
-	cd 3rdParty/sundials/build && $(CMAKE) .. -G $(CMAKE_TARGET) -DCMAKE_VERBOSE_MAKEFILE:Bool=ON -DCMAKE_INSTALL_PREFIX=`pwd` -DKLU_ENABLE:Bool=ON -DKLU_LIBRARY_DIR="$(builddir_lib_omc)" -DKLU_INCLUDE_DIR="$(OMBUILDDIR)/include/omc/c/suitesparse/Include/" -DCMAKE_C_FLAGS="$(CFLAGS) -Wl,--no-as-needed -lm -L $(builddir_lib_omc)" $(SUITESPARSE_LIBS) $(IS_MINGW32) $(IS_MINGW64) -DSUITESPARSECONFIG_LIBRARY="" -DLAPACK_ENABLE:Bool=ON
+	cd 3rdParty/sundials/build && $(CMAKE) .. -G $(CMAKE_TARGET) -DCMAKE_VERBOSE_MAKEFILE:Bool=ON -DCMAKE_INSTALL_PREFIX=`pwd` -DKLU_ENABLE:Bool=ON -DKLU_LIBRARY_DIR="$(builddir_lib_omc)" -DKLU_INCLUDE_DIR="$(OMBUILDDIR)/include/omc/c/suitesparse/Include/" -DCMAKE_C_FLAGS="$(CFLAGS) -lm -L $(builddir_lib_omc)" $(SUITESPARSE_LIBS) $(IS_MINGW32) $(IS_MINGW64) -DSUITESPARSECONFIG_LIBRARY="" -DLAPACK_ENABLE:Bool=ON
 	$(MAKE) -C 3rdParty/sundials/build install
 	# adrpo: do not copy the headers as they are not needed!
 	mkdir -p $(OMBUILDDIR)/include/omc/c/sundials

configure.ac

@@ -203,9 +203,11 @@ if $CC --version | grep -q gcc && $CC -dumpversion | grep -q "^5"; then
   TRY_FLAGS="$TRY_FLAGS -fno-ipa-pure-const"
 fi
 
-# GCC 7.x generates RUNPATH instead of RPATH
+# GCC 7.x issues:
+# - RUNPATH instead of RPATH, disable that via -Wl,--disable-new-dtags
+# - sqrt from libcolamd is not found in -lm if -Wl,--no-as-needed is not specified
 if $CC --version | grep -q gcc && $CC -dumpversion | grep -q "^7"; then
-  TRY_FLAGS="$TRY_FLAGS -Wl,--disable-new-dtags"
+  TRY_FLAGS="$TRY_FLAGS -Wl,--disable-new-dtags -Wl,--no-as-needed"
 fi
 
 for flag in $TRY_FLAGS; do