timidity: broken on *-musl / fix cross compilation

srcpkgs/timidity/template

@@ -1,7 +1,7 @@
 # Template file for 'timidity'
 pkgname="timidity"
 version="2.14.0"
-revision=1
+revision=2
 build_style=gnu-configure
 wrksrc="TiMidity++-${version}"
 short_desc="A MIDI to WAVE converter and player"
@@ -10,7 +10,6 @@ license="GPL-2"
 homepage="http://timidity.sourceforge.net"
 distfiles="${SOURCEFORGE_SITE}/${pkgname}/TiMidity++-${version}.tar.xz"
 checksum="abf0c8367959e85c9e635b8fbd5183fc27bd380e0ef5e45de4158784538c86fc"
-nocross="configure: error: cannot run test program while cross compiling"
 
 makedepends="alsa-lib-devel libvorbis-devel libao-devel libflac-devel
  libX11-devel gtk+-devel ncurses-devel"
@@ -19,3 +18,26 @@ configure_args="--with-default-path=/etc/timidity \
 		--enable-audio=alsa,oss,ao,vorbis,flac --enable-server \
 		--enable-alsaseq=yes --enable-network \
 		--enable-gtk --enable-ncurses"
+
+case "$XBPS_TARGET_MACHINE" in
+	*-musl) broken="build finishes, but timidity segfaults right after execution";;
+esac
+
+if [ -n ${CROSS_BUILD} ]; then
+	# check for va_copy runs test program; assume no for target
+	configure_args+=" lib_cv_va_copy=no lib_cv___va_copy=no lib_cv_va_val_copy=no"
+
+	pre_configure() {
+		# configure assumes OggFLAC is available on target and uses default values
+		sed -i -e 's|no_libOggFLAC=""|no_libOggFLAC="yes"|' configure
+	}
+
+	pre_build() {
+		# build ‘calcnewt’ with host gcc (calcnewt generates newton_table.c)
+		gcc -o timidity/calcnewt -lm timidity/calcnewt.c
+		# remove rule for ‘calcnewt’ from Makefile and make
+		# ‘newton_table.c’ not depend on removed rule
+		sed -i -e '/calcnewt$(EXEEXT): $(calcnewt_OBJECTS) $(calcnewt_DEPENDENCIES)/,+2d' \
+		-e 's|\(newton_table.c:\) calcnewt$(EXEEXT)|\1|' timidity/Makefile
+	}
+fi