yosys: move Makefile.conf generation to a function

scripts/compile_yosys.sh

@@ -29,8 +29,6 @@ then
 
     mkdir -p frontends/ghdl
     cp -R ../$dir_name_gyp/src/* frontends/ghdl
-    MAKEFILE_CONF_GHDL=$'ENABLE_GHDL := 1\n'
-    MAKEFILE_CONF_GHDL+="GHDL_PREFIX := $PACKAGE_DIR/$NAME"
 
     if [ $ARCH == "darwin" ]; then
         GHDL_LDLIBS="$PACKAGE_DIR/$NAME/lib/libghdl.a $(tr -s '\n' ' ' < $PACKAGE_DIR/$NAME/lib/libghdl.link)"
@@ -41,12 +39,20 @@ then
     fi
 fi
 
+_ghdl_conf() {
+    if [ $COMPILE_GHDL == "1" ]
+    then
+        echo 'ENABLE_GHDL := 1' >> Makefile.conf
+        echo "GHDL_PREFIX := $PACKAGE_DIR/$NAME" >> Makefile.conf
+    fi
+}
+
 # -- Compile it
 if [ $ARCH == "darwin" ]; then
     OLDPATH=$PATH
     export PATH="/usr/local/opt/bison/bin:/usr/local/opt/flex/bin:$PATH"
     $MAKE config-clang
-    echo "$MAKEFILE_CONF_GHDL" >> Makefile.conf
+    _ghdl_conf
     gsed -r -i 's/^(YOSYS_VER := [0-9]+\.[0-9]+\+[0-9]+).*$/\1 \(open-tool-forge build\)/;' Makefile
     sed -i "" "s/-Wall -Wextra -ggdb/-w/;" Makefile
     CXXFLAGS="-std=c++11 $CXXFLAGS" make \
@@ -59,7 +65,7 @@ if [ $ARCH == "darwin" ]; then
     export PATH=$OLDPATH
 elif [ ${ARCH:0:7} == "windows" ]; then
     $MAKE config-msys2-64
-    echo "$MAKEFILE_CONF_GHDL" >> Makefile.conf
+    _ghdl_conf
     sed -r -i 's/^(YOSYS_VER := [0-9]+\.[0-9]+\+[0-9]+).*$/\1 \(open-tool-forge build\)/;' Makefile
     $MAKE -j$J GIT_REV="${GIT_REV}" PRETTY=0 \
               LDLIBS="-static -lstdc++ -lm $GHDL_LDLIBS" \
@@ -74,7 +80,7 @@ elif [ ${ARCH:0:7} == "windows" ]; then
     test_bin yosys-smtbmc$EXE
 else
     $MAKE config-gcc
-    echo "$MAKEFILE_CONF_GHDL" >> Makefile.conf
+    _ghdl_conf
     sed -i "s/-Wall -Wextra -ggdb/-w/;" Makefile
     sed -r -i 's/^(YOSYS_VER := [0-9]+\.[0-9]+\+[0-9]+).*$/\1 \(open-tool-forge build\)/;' Makefile
     # sed -i "s/LD = gcc$/LD = $CC/;" Makefile