mruby: build for host with clang

Trying to build for i686 native with gcc, or trying to cross build
with i686 as the host architecture, the build fails. This seems to
be a problem with either i686 gcc or the binutils (linker).

For now build with clang for native and for the host when cross
compiling to work around the problems.

TODO: find the real reason why the compiler or linker packages
for i686 are broken and switch back to using gcc.

srcpkgs/mruby/template

@@ -1,8 +1,8 @@
 # Template file for 'mruby'
 pkgname=mruby
 version=2.1.0
-revision=1
+revision=2
-hostmakedepends="bison ruby"
+hostmakedepends="bison clang ruby"
 short_desc="Lightweight implementation of the Ruby language (Ruby 1.9)"
 maintainer="Jürgen Buchmüller <pullmoll@t-online.de>"
 license="MIT"
@@ -10,35 +10,59 @@ homepage="https://mruby.org/"
 distfiles="https://github.com/mruby/mruby/archive/${version}.tar.gz>${pkgname}-${version}.tar.gz"
 checksum=d6733742a07e553c52ab71df08b0604b3b571768bbc0c2729fbf0389d1bb5d13
 lib32disabled=yes
+# I cannot get clang to link a PIE executable
+nopie=yes
 
-if [ "$XBPS_TARGET_WORDSIZE" = 32 ]; then
+# Note: we use clang to build for the host because with gcc the build fails
-	broken="Currently fails to build for 32 bit architectures"
+# for i686 (native) and also when i686 is the host architecture for cross builds.
-fi
+LIBS="m"
 
 do_configure() {
 	vsed -i mrbgems/mruby-compiler/core/parse.y -e "s;%pure-parser;%define api.pure;"
 
-	cat <<-EOF > xbps_config.rb
+	if [ -z "$CROSS_BUILD" ]; then
-	MRuby::Build.new do |conf|
+		# Native build
-	  toolchain :gcc
+		cat <<-EOF > xbps_config.rb
-	  conf.gem "#{root}/mrbgems/mruby-bin-mruby"
+		MRuby::Build.new do |conf|
-	  conf.gem "#{root}/mrbgems/mruby-bin-mrbc"
+		  toolchain :clang
-	  conf.cc do |cc|
+		  conf.gem "#{root}/mrbgems/mruby-bin-mruby"
-	    cc.command = 'gcc'
+		  conf.gem "#{root}/mrbgems/mruby-bin-mrbc"
-	    cc.flags = [ENV['CFLAGS_host'] || %w()]
+		  conf.cc do |cc|
-	    cc.include_paths = ["#{root}/include"]
+		    cc.command = 'clang'
-	  end
+		    cc.flags = [ENV['CFLAGS'] || %w()]
-	  conf.linker do |linker|
+		    cc.include_paths = ["#{root}/include"]
-	    linker.command = 'gcc'
+		  end
-	    linker.libraries = 'm'
+		  conf.linker do |linker|
-	  end
+		    linker.command = 'clang'
-	  conf.archiver do |archiver|
+		    linker.flags = [ENV['LDFLAGS'] || %w()]
-	    archiver.command = 'ar'
+		    linker.libraries = [ENV['LIBS'] || 'm']
-	  end
+		  end
-	end
+		  conf.archiver do |archiver|
-	EOF
+		    archiver.command = 'ar'
-	if [ "$CROSS_BUILD" ]; then
+		  end
-		cat <<-EOF >> xbps_config.rb
+		end
+		EOF
+	else
+		# Cross build
+		cat <<-EOF > xbps_config.rb
+		MRuby::Build.new do |conf|
+		  toolchain :clang
+		  conf.gem "#{root}/mrbgems/mruby-bin-mruby"
+		  conf.gem "#{root}/mrbgems/mruby-bin-mrbc"
+		  conf.cc do |cc|
+		    cc.command = 'clang'
+		    cc.flags = [ENV['CFLAGS_host'] || %w()]
+		    cc.include_paths = ["#{root}/include"]
+		  end
+		  conf.linker do |linker|
+		    linker.command = 'clang'
+		    linker.flags = [ENV['LDFLAGS_host'] || %w()]
+		    linker.libraries = [ENV['LIBS'] || 'm']
+		  end
+		  conf.archiver do |archiver|
+		    archiver.command = 'ar'
+		  end
+		end
 		MRuby::CrossBuild.new('${XBPS_CROSS_TRIPLET}') do |conf|
 		  toolchain :gcc
 		  conf.gem "#{root}/mrbgems/mruby-bin-mruby"
@@ -54,8 +78,8 @@ do_configure() {
 		  end
 		  conf.linker do |linker|
 		    linker.command = ENV['CC'] || '${XBPS_CROSS_TRIPLET}-gcc'
-		    linker.libraries = ENV['LIBS'] || 'm'
+		    linker.flags = [ENV['LDFLAGS'] || %w()]
-		    linker.flags_after_libraries = [ENV['LDFLAGS'] || %w()]
+		    linker.libraries = [ENV['LIBS'] || 'm']
 		    linker.library_paths = '${XBPS_CROSS_BASE}/usr/lib'
 		  end
 		  conf.archiver do |archiver|
@@ -67,7 +91,28 @@ do_configure() {
 }
 
 do_build() {
-	MRUBY_CONFIG=xbps_config.rb ruby ./minirake
+	# Enable verbosity and/or trace
+	# vsed -i minirake -e '/^$rake_failed/a $verbose = 1'
+	# vsed -i minirake -e '/^$rake_failed/a $trace = 1'
+
+	# Set the number of parallel jobs from $makejobs
+	vsed -i minirake -e "s;^\(\$rake_jobs =\).*;\1 ${makejobs/-j/};"
+
+	# clang does not understand -fstack-clash-protection
+	CFLAGS="${CFLAGS/-fstack-clash-protection/}"
+
+	if [ "$CROSS_BUILD" ]; then
+		CFLAGS_host="${CFLAGS_host/-fstack-clash-protection/}"
+		echo "CFLAGS_host   : $CFLAGS_host"
+		echo "LDFLAGS_host  : $LDFLAGS_host"
+	fi
+	echo "CFLAGS        : $CFLAGS"
+	echo "LDFLAGS       : $LDFLAGS"
+	echo "LIBS          : $LIBS"
+	CFLAGS="$CFLAGS" CFLAGS_host="$CFLAGS_host" \
+	LDFLAGS="$LDFLAGS" LDFLAGS_host="$LDFLAGS_host" \
+	LIBS="$LIBS" MRUBY_CONFIG=xbps_config.rb VERBOS=1 \
+		ruby minirake
 }
 
 do_install() {