debian/changelog

+fastml (3.11-2) unstable; urgency=medium
+
+  * Description: Enable cross building
+    Closes: #933405
+
+ -- Andreas Tille <tille@debian.org>  Tue, 30 Jul 2019 16:01:25 +0200
+
 fastml (3.11-1) unstable; urgency=medium
 
   [ Jelmer Vernooij ]

debian/patches/cross.patch

+From: Helmut Grohne <helmut@subdivi.de>
+Date: Tue, 30 Jul 2019 15:09:13 +0200
+Bug-Debian: https://bugs.debian.org/933405
+Description: Enable cross building
+ fastml fails to cross build from source, because it uses both CC and CXX
+ for a C++ compiler, but dh_auto_build passes a C compiler for CC. The
+ use is kinda implicit via builtin make rules. The attached patch makes
+ the relevant rule explicit and thus removes the use of CC to make fastml
+ cross buildable. Please consider applying it.
+
+--- a/programs/Makefile.generic
++++ b/programs/Makefile.generic
+@@ -17,9 +17,7 @@ DOUBLEREPLIB = $(LIB:.a=DoubleRep.a)
+ 
+ all: lib $(EXEC)
+ 
+-#CC=g++
+ CXX=g++
+-CC=$(CXX)
+ 
+ libDir=../../libs/phylogeny
+ binDir=../../bin
+@@ -112,6 +110,7 @@ endif
+ #$(EXEC) $(TEST_EXEC): $(LIB) #$(EVOLLIB)
+ #$(EXEC) $(TEST_EXEC): $(LIB) $(EVOLLIB)
+ $(EXEC) $(TEST_EXEC): $(LocalLib) $(libEvol)
++	$(CXX) $(LDFLAGS) $^ -o $@
+ $(DEBUGEXEC) $(TEST_EXEC): $(DEBUGLIB) $(libEvolDebug)
+ 
+ tests: $(TEST_EXEC) $(EXEC)

debian/patches/series

@@ -5,3 +5,4 @@ spelling.patch
 change_to_tests_dir_only_if_existing.patch
 skip_failing_tests.patch
 remove-template-depth.patch
+cross.patch