#44 crrcsim fails to link with CGAL >5.x

[Damian Wrobel]

Building crrcsim with CGAL >5.x in fedora 32 [1] [2] fails as following:

/usr/bin/ld: cannot find -lCGAL
collect2: error: ld returned 1 exit status

It looks that the new CGAL can be used in a header only mode. The following change fixes the isse:

diff -r e3a0407da6eb -r 831feb92d439 configure.ac
--- a/configure.ac      Wed Jul 04 21:29:22 2018 +0200
+++ b/configure.ac      Fri Jan 31 13:23:53 2020 +0100
@@ -233,8 +233,8 @@
       AC_DEFINE([CGAL_VERSION3], [1], [CGAL_VERSION3 compatibility])
       has_CGAL="yes  (found CGAL v3)"
     fi

-    CGAL_CFLAGS=-frounding-math
-    CGAL_LIBS=-lCGAL
+    CGAL_CFLAGS="-frounding-math -DCGAL_HEADER_ONLY=1"
+    CGAL_LIBS=
     AC_DEFINE([WINDDATA3D], [1], [Import code for wind data, needs CGAL, 0 to disable])
 else
     has_CGAL="no   (CGAL not found)"

[1] https://koji.fedoraproject.org/koji/taskinfo?taskID=41140074
[2] https://kojipkgs.fedoraproject.org//work/tasks/74/41140074/build.log

[Andrea Bravetti]

thank you