native gcc: build libgmp

cross/pkgs/gcc/.gitignore

@@ -0,0 +1,2 @@
+src/
+out/

cross/pkgs/gcc/build.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+echo "Cross compiling GCC and dependencies"
+
+export WORKING_DIR="$JEHANNE/hacking/cross/pkgs/gcc"
+
+# include x86_64-jehanne-pkg-config in PATH
+export PATH="$JEHANNE/hacking/cross/:$PATH"
+
+function failOnError {
+	# $1 -> exit status on a previous command
+	# $2 -> task description
+	if [ $1 -ne 0 ]; then
+		kill $dotter
+		wait $dotter 2>/dev/null
+
+		echo "ERROR $2"
+		echo
+		echo BUILD LOG:
+		echo
+		cat cross-toolchain.build.log
+		exit $1
+	fi
+}
+
+date > $WORKING_DIR/gcc.build.log
+
+(cd src && fetch) >> $WORKING_DIR/gcc.build.log
+failOnError $? "fetching sources"
+
+echo -n Building libgmp...
+(
+	cd libgmp
+	patch -p0 < $WORKING_DIR/patch/libgmp.patch
+	./configure --host=x86_64-jehanne --prefix=/pkgs/libgmp/6.1.2/
+	make
+	make DESTDIR=$JEHANNE install
+) >> $WORKING_DIR/gcc.build.log
+failOnError $? "Building libgmp"
+echo done.

cross/pkgs/gcc/patch/libgmp.patch

@@ -0,0 +1,11 @@
+diff -Naru ../orig/configfsf.sub ./configfsf.sub
+--- ../orig/configfsf.sub	2018-11-26 11:59:08.897396848 +0100
++++ ./configfsf.sub	2018-11-26 12:20:10.079672849 +0100
+@@ -1399,6 +1399,7 @@
+ 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
+ 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
+ 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
++	      | -jehanne* \
+ 	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* | -tirtos*)
+ 	# Remember, each alternative MUST END IN *, to match a version number.
+ 		;;

cross/pkgs/gcc/src/fetch.json

@@ -0,0 +1,12 @@
+{
+	"libgmp" : {
+		"Upstream":"https://gmplib.org/download/gmp/gmp-6.1.2.tar.bz2",
+		"Digest": {
+			"sha256":"5275bb04f4863a13516b2f39392ac5e272f5e1bb8057b18aec1c9b79d73d8fb2"
+		},
+		"Compress":"bzip2",
+		"RemovePrefix": true,
+		"Exclude": [
+		]
+	}
+}

cross/x86_64-jehanne-pkg-config

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# from https://wiki.osdev.org/Cross-Porting_Software
+
+# Fill these in appropriately:
+export PKG_CONFIG_SYSROOT_DIR=$JEHANNE
+export PKG_CONFIG_LIBDIR=$JEHANNE/lib/pkgconfig
+
+# TODO: If it works this should probably just be set to the empty string.
+export PKG_CONFIG_PATH=$PKG_CONFIG_LIBDIR
+
+# Use --static here if your OS only has static linking.
+# TODO: Perhaps it's a bug in the libraries if their pkg-config files
+#       doesn't record that only static libraries were built.
+exec pkg-config --static "$@"