[Graphviz] Do not build with -ffast-math

G/Graphviz/build_tarballs.jl

@@ -35,11 +35,14 @@ if [[ "${target}" == *-mingw* ]]; then
 
     # Remove wrong libtool archives
     rm ${prefix}/lib/libharfbuzz*.la
-
-    # Rebuild the configure script
-    autoreconf -fiv
 fi
 
+# Do not build with -ffast-math
+atomic_patch -p1 ../patches/1001-no-ffast-math.patch
+
+# Rebuild the configure script
+autoreconf -fiv
+
 # Apply patch to build a native `mkdefs` utility that can be run within the
 # build environment.
 atomic_patch -p1 ../patches/0001-gvpr-build-native-mkdefs.patch

G/Graphviz/bundled/patches/1001-no-ffast-math.patch

@@ -0,0 +1,20 @@
+--- a/configure.ac
++++ b/configure.ac
+@@ -379,7 +379,7 @@
+ 	        LDFLAGS="${LDFLAGS} -Wl,-headerpad_max_install_names"
+ 	        ;;
+ 	    *-freebsd* )
+-	        CFLAGS="${CFLAGS} -Wstrict-prototypes -Wpointer-arith -Wall -ffast-math"
++	        CFLAGS="${CFLAGS} -Wstrict-prototypes -Wpointer-arith -Wall"
+ 		    ;;
+ 	    * )
+ 	    # -Wno-unused-parameter only needed for bug in gcc3
+@@ -393,7 +393,7 @@
+ 					;;
+ 				esac
+ 		    fi
+-	        CFLAGS="${CFLAGS} -Wno-unknown-pragmas -Wstrict-prototypes -Wpointer-arith -Wall -ffast-math"
++	        CFLAGS="${CFLAGS} -Wno-unknown-pragmas -Wstrict-prototypes -Wpointer-arith -Wall"
+ 	        ;;
+ 	    esac
+ 	    ;;