566 lines
25 KiB
Scheme
566 lines
25 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2020 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2016, 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;; Copyright © 2016 Manolis Fragkiskos Ragkousis <manolis837@gmail.com>
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;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
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;;; Copyright © 2019, 2020, 2021 Marius Bakke <marius@gnu.org>
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;;; Copyright © 2019 Carl Dong <contact@carldong.me>
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;;; Copyright © 2020 Mathieu Othacehe <m.othacehe@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
|
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;;;
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||
;;; GNU Guix is free software; you can redistribute it and/or modify it
|
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;;; under the terms of the GNU General Public License as published by
|
||
;;; the Free Software Foundation; either version 3 of the License, or (at
|
||
;;; your option) any later version.
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;;;
|
||
;;; GNU Guix is distributed in the hope that it will be useful, but
|
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;;; GNU General Public License for more details.
|
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;;;
|
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;;; You should have received a copy of the GNU General Public License
|
||
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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|
||
(define-module (gnu packages cross-base)
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#:use-module (gnu packages)
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#:use-module (gnu packages gcc)
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#:use-module (gnu packages base)
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#:use-module (gnu packages linux)
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#:use-module (gnu packages hurd)
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#:use-module (gnu packages mingw)
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#:use-module (guix platform)
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#:use-module (guix packages)
|
||
#:use-module (guix download)
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||
#:use-module (guix utils)
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#:use-module (guix build-system gnu)
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||
#:use-module (guix build-system trivial)
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#:use-module (srfi srfi-1)
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||
#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
|
||
#:use-module (ice-9 regex)
|
||
#:export (cross-binutils
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||
cross-libc
|
||
cross-gcc
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||
cross-kernel-headers))
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||
|
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(define-syntax %xgcc
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||
;; GCC package used as the basis for cross-compilation. It doesn't have to
|
||
;; be 'gcc' and can be a specific variant such as 'gcc-4.8'.
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;;
|
||
;; Note: This is a macro so that we do not refer to 'gcc' from the top
|
||
;; level, which would lead to circular-dependency issues.
|
||
(identifier-syntax gcc))
|
||
|
||
(define %gcc-include-paths
|
||
;; Environment variables for header search paths.
|
||
;; Note: See <http://bugs.gnu.org/22186> for why not 'CPATH'.
|
||
'("C_INCLUDE_PATH"
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||
"CPLUS_INCLUDE_PATH"
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"OBJC_INCLUDE_PATH"
|
||
"OBJCPLUS_INCLUDE_PATH"))
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|
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(define %gcc-cross-include-paths
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;; Search path for target headers when cross-compiling.
|
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(map (cut string-append "CROSS_" <>) %gcc-include-paths))
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|
||
(define (cross p target)
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||
(package (inherit p)
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(name (string-append (package-name p) "-cross-" target))
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(arguments
|
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(substitute-keyword-arguments (package-arguments p)
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((#:configure-flags flags)
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`(cons ,(string-append "--target=" target)
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,flags))))))
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||
|
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(define* (cross-binutils target #:optional (binutils binutils))
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"Return a cross-Binutils for TARGET using BINUTILS."
|
||
(let ((binutils (package (inherit binutils)
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||
(arguments
|
||
(substitute-keyword-arguments (package-arguments
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||
binutils)
|
||
((#:configure-flags flags)
|
||
;; Build with `--with-sysroot' so that ld honors
|
||
;; DT_RUNPATH entries when searching for a needed
|
||
;; library. This works because as a side effect
|
||
;; `genscripts.sh' sets `USE_LIBPATH=yes', which tells
|
||
;; elf32.em to use DT_RUNPATH in its search list.
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||
;; See <http://sourceware.org/ml/binutils/2013-05/msg00312.html>.
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;;
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||
;; In theory choosing / as the sysroot could lead ld
|
||
;; to pick up native libs instead of target ones. In
|
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;; practice the RUNPATH of target libs only refers to
|
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;; target libs, not native libs, so this is safe.
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||
`(cons "--with-sysroot=/" ,flags)))))))
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|
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;; For Xtensa, apply Qualcomm's patch.
|
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(cross (cond ((string-prefix? "xtensa-" target)
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(package-with-patches binutils
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(search-patches
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"ath9k-htc-firmware-binutils.patch")))
|
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((target-mingw? target)
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(package-with-extra-patches
|
||
(package-with-extra-configure-variable
|
||
;; mingw binutils does not work correctly when configured
|
||
;; with `--enable-compressed-debug-sections`. An error
|
||
;; like the following will occur whenever you try to link:
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||
;;
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;; x86_64-w64-mingw32-ld: final link failed: bad value
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;;
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||
;; TODO: This seems like a deeper problem that warrants
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;; deeper investigation.
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binutils "--enable-compressed-debug-sections" "no")
|
||
(search-patches "binutils-mingw-w64-timestamp.patch"
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||
"binutils-mingw-w64-deterministic.patch")))
|
||
(else binutils))
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||
target)))
|
||
|
||
(define (cross-gcc-arguments target xgcc libc)
|
||
"Return build system arguments for a cross-gcc for TARGET, using XGCC as the
|
||
base compiler and using LIBC (which may be either a libc package or #f.)"
|
||
;; Set the current target system so that 'glibc-dynamic-linker' returns the
|
||
;; right name.
|
||
(parameterize ((%current-target-system target))
|
||
;; Disable stripping as this can break binaries, with object files of
|
||
;; libgcc.a showing up as having an unknown architecture. See
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||
;; <http://lists.fedoraproject.org/pipermail/arm/2010-August/000663.html>
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;; for instance.
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(let ((args `(#:strip-binaries? #f
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,@(package-arguments xgcc))))
|
||
(substitute-keyword-arguments args
|
||
((#:configure-flags flags)
|
||
`(append (list ,(string-append "--target=" target)
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||
,@(if libc
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||
`( ;; Disable libcilkrts because it is not
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||
;; ported to GNU/Hurd.
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||
"--disable-libcilkrts"
|
||
;; When building a cross compiler, --with-sysroot is
|
||
;; implicitly set to "$gcc_tooldir/sys-root". This does
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;; not work for us, because --with-native-system-header-dir
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;; is searched for relative to this location. Thus, we set
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||
;; it to "/" so GCC is able to find the target libc headers.
|
||
;; This is safe because in practice GCC uses CROSS_CPATH
|
||
;; & co to separate target and host libraries.
|
||
"--with-sysroot=/")
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`( ;; Disable features not needed at this stage.
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"--disable-shared" "--enable-static"
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"--enable-languages=c,c++"
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|
||
;; libstdc++ cannot be built at this stage
|
||
;; ("Link tests are not allowed after
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;; GCC_NO_EXECUTABLES.").
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||
"--disable-libstdc++-v3"
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||
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||
"--disable-threads" ;libgcc, would need libc
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||
"--disable-libatomic"
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"--disable-libmudflap"
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||
"--disable-libgomp"
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||
"--disable-libmpx"
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"--disable-libssp"
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||
"--disable-libquadmath"
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||
"--disable-decimal-float" ;would need libc
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"--disable-libcilkrts"
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||
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||
;; When target is any OS other than 'none' these
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||
;; libraries will fail if there is no libc
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||
;; present. See
|
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;; <https://lists.gnu.org/archive/html/guix-devel/2016-02/msg01311.html>
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||
"--disable-libitm"
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"--disable-libvtv"
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"--disable-libsanitizer"
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||
))
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||
|
||
;; Install cross-built libraries such as libgcc_s.so in
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;; the "lib" output.
|
||
,@(if libc
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||
`((string-append "--with-toolexeclibdir="
|
||
(assoc-ref %outputs "lib")
|
||
"/" ,target "/lib"))
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||
'()))
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||
|
||
,(if libc
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||
flags
|
||
`(remove (cut string-match "--enable-languages.*" <>)
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||
,flags))))
|
||
((#:make-flags flags)
|
||
(if libc
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||
`(let ((libc (assoc-ref %build-inputs "libc")))
|
||
;; FLAGS_FOR_TARGET are needed for the target libraries to receive
|
||
;; the -Bxxx for the startfiles.
|
||
(cons (string-append "FLAGS_FOR_TARGET=-B" libc "/lib")
|
||
,flags))
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||
flags))
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||
((#:phases phases)
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||
`(cross-gcc-build-phases ,target ,phases))))))
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||
|
||
(define (cross-gcc-patches xgcc target)
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||
"Return GCC patches needed for XGCC and TARGET."
|
||
(cond ((string-prefix? "xtensa-" target)
|
||
;; Patch by Qualcomm needed to build the ath9k-htc firmware.
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||
(search-patches "ath9k-htc-firmware-gcc.patch"))
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||
((target-mingw? target)
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(append (search-patches "gcc-4.9.3-mingw-gthr-default.patch")
|
||
(if (version>=? (package-version xgcc) "7.0")
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||
(search-patches "gcc-7-cross-mingw.patch")
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||
'())))
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||
(else '())))
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||
|
||
(define (cross-gcc-snippet target)
|
||
"Return GCC snippet needed for TARGET."
|
||
`(begin
|
||
,@(if (target-mingw? target)
|
||
'((copy-recursively "libstdc++-v3/config/os/mingw32-w64"
|
||
"libstdc++-v3/config/os/newlib"))
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||
'())
|
||
;; TOOLDIR_BASE_PREFIX is erroneous when using a separate "lib"
|
||
;; output. Specify it correctly, otherwise GCC won't find its shared
|
||
;; libraries installed in the "lib" output. See:
|
||
;; https://lists.gnu.org/archive/html/bug-guix/2020-03/msg00196.html.
|
||
(substitute* "gcc/Makefile.in"
|
||
(("-DTOOLDIR_BASE_PREFIX=[^ ]*")
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||
"-DTOOLDIR_BASE_PREFIX=\\\"../../../../\\\""))
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||
#t))
|
||
|
||
(define* (cross-gcc target
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||
#:key
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||
(xgcc %xgcc)
|
||
(xbinutils (cross-binutils target))
|
||
(libc #f))
|
||
"Return a cross-compiler for TARGET, where TARGET is a GNU triplet. Use
|
||
XGCC as the base compiler. Use XBINUTILS as the associated cross-Binutils.
|
||
If LIBC is false, then build a GCC that does not target a libc; otherwise,
|
||
target that libc."
|
||
(package (inherit xgcc)
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||
(name (string-append "gcc-cross-"
|
||
(if libc "" "sans-libc-")
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||
target))
|
||
(source
|
||
(origin
|
||
(inherit (package-source xgcc))
|
||
(patches
|
||
(append
|
||
(origin-patches (package-source xgcc))
|
||
(append (cond
|
||
((version>=? (package-version xgcc) "10.0")
|
||
(search-patches "gcc-10-cross-environment-variables.patch"
|
||
"gcc-cross-gxx-include-dir.patch"))
|
||
((version>=? (package-version xgcc) "8.0")
|
||
(search-patches "gcc-8-cross-environment-variables.patch"))
|
||
((version>=? (package-version xgcc) "6.0")
|
||
(search-patches "gcc-7-cross-toolexeclibdir.patch"
|
||
"gcc-6-cross-environment-variables.patch"))
|
||
(else
|
||
(search-patches "gcc-cross-environment-variables.patch")))
|
||
(cross-gcc-patches xgcc target))))
|
||
(modules '((guix build utils)))
|
||
(snippet
|
||
(cross-gcc-snippet target))))
|
||
|
||
(outputs '("out" "lib"))
|
||
|
||
(arguments
|
||
`(#:implicit-inputs? #f
|
||
#:imported-modules ((gnu build cross-toolchain)
|
||
,@%gnu-build-system-modules)
|
||
#:modules ((guix build gnu-build-system)
|
||
(guix build utils)
|
||
(gnu build cross-toolchain)
|
||
(srfi srfi-1)
|
||
(srfi srfi-26)
|
||
(ice-9 regex))
|
||
|
||
,@(cross-gcc-arguments target xgcc libc)))
|
||
|
||
(native-inputs
|
||
`(("ld-wrapper-cross" ,(make-ld-wrapper
|
||
(string-append "ld-wrapper-" target)
|
||
#:target (const target)
|
||
#:binutils xbinutils))
|
||
("binutils-cross" ,xbinutils)
|
||
|
||
,@(let ((inputs (append (package-inputs xgcc)
|
||
(fold alist-delete (%final-inputs)
|
||
'("libc" "libc:static"))
|
||
|
||
;; Call it differently so that the builder can
|
||
;; check whether the "libc" input is #f.
|
||
`(("libc-native"
|
||
,@(assoc-ref (%final-inputs) "libc"))
|
||
("libc-native:static"
|
||
,@(assoc-ref (%final-inputs)
|
||
"libc:static"))))))
|
||
(cond
|
||
((target-mingw? target)
|
||
(if libc
|
||
`(,@inputs
|
||
("libc" ,libc))
|
||
`(,@inputs
|
||
("mingw-source" ,(package-source mingw-w64)))))
|
||
(libc
|
||
`(,@inputs
|
||
("libc" ,libc)
|
||
("libc:static" ,libc "static")
|
||
("xkernel-headers" ;the target headers
|
||
,@(assoc-ref (package-propagated-inputs libc)
|
||
"kernel-headers"))))
|
||
(else inputs)))))
|
||
|
||
(inputs '())
|
||
|
||
;; Only search target inputs, not host inputs.
|
||
(search-paths (cons (search-path-specification
|
||
(variable "CROSS_LIBRARY_PATH")
|
||
(files '("lib" "lib64")))
|
||
(map (lambda (variable)
|
||
(search-path-specification
|
||
(variable variable)
|
||
|
||
;; Add 'include/c++' here so that <cstdlib>'s
|
||
;; "#include_next <stdlib.h>" finds GCC's
|
||
;; <stdlib.h>, not libc's.
|
||
(files (match variable
|
||
("CROSS_CPLUS_INCLUDE_PATH"
|
||
'("include/c++" "include"))
|
||
(_
|
||
'("include"))))))
|
||
%gcc-cross-include-paths)))
|
||
(native-search-paths '())))
|
||
|
||
(define* (cross-kernel-headers target
|
||
#:optional
|
||
(linux-headers linux-libre-headers)
|
||
(xgcc (cross-gcc target))
|
||
(xbinutils (cross-binutils target)))
|
||
"Return headers depending on TARGET."
|
||
|
||
(define xlinux-headers
|
||
(package (inherit linux-headers)
|
||
(name (string-append (package-name linux-headers)
|
||
"-cross-" target))
|
||
(arguments
|
||
(substitute-keyword-arguments
|
||
`(#:implicit-cross-inputs? #f
|
||
,@(package-arguments linux-headers))
|
||
((#:phases phases)
|
||
`(modify-phases ,phases
|
||
(replace 'build
|
||
(lambda _
|
||
(setenv "ARCH" ,(platform-linux-architecture
|
||
(lookup-platform-by-target target)))
|
||
(format #t "`ARCH' set to `~a' (cross compiling)~%"
|
||
(getenv "ARCH"))
|
||
|
||
(invoke "make" ,(system->defconfig target))
|
||
(invoke "make" "mrproper"
|
||
,@(if (version>=? (package-version linux-headers) "5.3")
|
||
'("headers")
|
||
'("headers_check")))))))))
|
||
(native-inputs `(("cross-gcc" ,xgcc)
|
||
("cross-binutils" ,xbinutils)
|
||
,@(package-native-inputs linux-headers)))))
|
||
|
||
(define xgnumach-headers
|
||
(package (inherit gnumach-headers)
|
||
(name (string-append (package-name gnumach-headers)
|
||
"-cross-" target))
|
||
|
||
(native-inputs `(("cross-gcc" ,xgcc)
|
||
("cross-binutils" ,xbinutils)
|
||
,@(package-native-inputs gnumach-headers)))))
|
||
|
||
(define xmig
|
||
(package (inherit mig)
|
||
(name (string-append "mig-cross"))
|
||
(arguments
|
||
`(#:modules ((guix build gnu-build-system)
|
||
(guix build utils)
|
||
(srfi srfi-26))
|
||
#:phases (modify-phases %standard-phases
|
||
(add-before 'configure 'set-cross-headers-path
|
||
(lambda* (#:key inputs #:allow-other-keys)
|
||
(let* ((mach (assoc-ref inputs "cross-gnumach-headers"))
|
||
(cpath (string-append mach "/include")))
|
||
(for-each (cut setenv <> cpath)
|
||
',%gcc-cross-include-paths)
|
||
#t))))
|
||
#:configure-flags (list ,(string-append "--target=" target))
|
||
#:tests? #f))
|
||
|
||
(propagated-inputs `(("cross-gnumach-headers" ,xgnumach-headers)))
|
||
(native-inputs `(("cross-gcc" ,xgcc)
|
||
("cross-binutils" ,xbinutils)
|
||
,@(package-native-inputs mig)))))
|
||
|
||
(define xhurd-headers
|
||
(package (inherit hurd-headers)
|
||
(name (string-append (package-name hurd-headers)
|
||
"-cross-" target))
|
||
|
||
(native-inputs `(("cross-gcc" ,xgcc)
|
||
("cross-binutils" ,xbinutils)
|
||
("cross-mig" ,xmig)
|
||
,@(alist-delete "mig"(package-native-inputs hurd-headers))))))
|
||
|
||
(define xglibc/hurd-headers
|
||
(package (inherit glibc/hurd-headers)
|
||
(name (string-append (package-name glibc/hurd-headers)
|
||
"-cross-" target))
|
||
|
||
(arguments
|
||
(substitute-keyword-arguments
|
||
`(#:modules ((guix build gnu-build-system)
|
||
(guix build utils)
|
||
(srfi srfi-26))
|
||
,@(package-arguments glibc/hurd-headers))
|
||
((#:phases phases)
|
||
`(modify-phases ,phases
|
||
(add-after 'unpack 'set-cross-headers-path
|
||
(lambda* (#:key inputs #:allow-other-keys)
|
||
(let* ((mach (assoc-ref inputs "gnumach-headers"))
|
||
(hurd (assoc-ref inputs "hurd-headers"))
|
||
(cpath (string-append mach "/include:"
|
||
hurd "/include")))
|
||
(for-each (cut setenv <> cpath)
|
||
',%gcc-cross-include-paths)
|
||
#t)))))))
|
||
|
||
(propagated-inputs `(("gnumach-headers" ,xgnumach-headers)
|
||
("hurd-headers" ,xhurd-headers)))
|
||
|
||
(native-inputs `(("cross-gcc" ,xgcc)
|
||
("cross-binutils" ,xbinutils)
|
||
("cross-mig" ,xmig)
|
||
,@(alist-delete "mig"(package-native-inputs glibc/hurd-headers))))))
|
||
|
||
(define xhurd-minimal
|
||
(package (inherit hurd-minimal)
|
||
(name (string-append (package-name hurd-minimal)
|
||
"-cross-" target))
|
||
(arguments
|
||
(substitute-keyword-arguments
|
||
`(#:modules ((guix build gnu-build-system)
|
||
(guix build utils)
|
||
(srfi srfi-26))
|
||
,@(package-arguments hurd-minimal))
|
||
((#:phases phases)
|
||
`(modify-phases ,phases
|
||
(add-before 'configure 'set-cross-headers-path
|
||
(lambda* (#:key inputs #:allow-other-keys)
|
||
(let* ((glibc-headers (assoc-ref inputs "cross-glibc-hurd-headers"))
|
||
(cpath (string-append glibc-headers "/include")))
|
||
(for-each (cut setenv <> cpath)
|
||
',%gcc-cross-include-paths)
|
||
#t)))))))
|
||
|
||
(inputs `(("cross-glibc-hurd-headers" ,xglibc/hurd-headers)))
|
||
|
||
(native-inputs `(("cross-gcc" ,xgcc)
|
||
("cross-binutils" ,xbinutils)
|
||
("cross-mig" ,xmig)
|
||
,@(alist-delete "mig"(package-native-inputs hurd-minimal))))))
|
||
|
||
(define xhurd-core-headers
|
||
(package (inherit hurd-core-headers)
|
||
(name (string-append (package-name hurd-core-headers)
|
||
"-cross-" target))
|
||
|
||
(inputs `(("gnumach-headers" ,xgnumach-headers)
|
||
("hurd-headers" ,xhurd-headers)
|
||
("hurd-minimal" ,xhurd-minimal)))
|
||
|
||
(native-inputs `(("cross-gcc" ,xgcc)
|
||
("cross-binutils" ,xbinutils)
|
||
("cross-mig" ,xmig)
|
||
,@(package-native-inputs hurd-core-headers)))))
|
||
|
||
(match target
|
||
((or "i586-pc-gnu" "i586-gnu") xhurd-core-headers)
|
||
(_ xlinux-headers)))
|
||
|
||
(define* (cross-libc target
|
||
#:optional
|
||
(libc glibc)
|
||
(xgcc (cross-gcc target))
|
||
(xbinutils (cross-binutils target))
|
||
(xheaders (cross-kernel-headers target)))
|
||
"Return LIBC cross-built for TARGET, a GNU triplet. Use XGCC and XBINUTILS
|
||
and the cross tool chain."
|
||
(if (target-mingw? target)
|
||
(let ((machine (substring target 0 (string-index target #\-))))
|
||
(make-mingw-w64 machine
|
||
#:xgcc xgcc
|
||
#:xbinutils xbinutils))
|
||
(package
|
||
(inherit libc)
|
||
(name (string-append "glibc-cross-" target))
|
||
(arguments
|
||
(substitute-keyword-arguments
|
||
`( ;; Disable stripping (see above.)
|
||
#:strip-binaries? #f
|
||
|
||
;; This package is used as a target input, but it should not have
|
||
;; the usual cross-compilation inputs since that would include
|
||
;; itself.
|
||
#:implicit-cross-inputs? #f
|
||
|
||
;; We need SRFI 26.
|
||
#:modules ((guix build gnu-build-system)
|
||
(guix build utils)
|
||
(srfi srfi-26))
|
||
|
||
,@(package-arguments libc))
|
||
((#:configure-flags flags)
|
||
`(cons ,(string-append "--host=" target)
|
||
,(if (target-hurd? target)
|
||
`(cons "--disable-werror" ,flags)
|
||
flags)))
|
||
((#:phases phases)
|
||
`(modify-phases ,phases
|
||
(add-before 'configure 'set-cross-kernel-headers-path
|
||
(lambda* (#:key inputs #:allow-other-keys)
|
||
(let* ((kernel (assoc-ref inputs "kernel-headers"))
|
||
(cpath (string-append kernel "/include")))
|
||
(for-each (cut setenv <> cpath)
|
||
',%gcc-cross-include-paths)
|
||
(setenv "CROSS_LIBRARY_PATH"
|
||
(string-append kernel "/lib")) ; for Hurd's libihash
|
||
#t)))
|
||
,@(if (target-hurd? target)
|
||
'((add-after 'install 'augment-libc.so
|
||
(lambda* (#:key outputs #:allow-other-keys)
|
||
(let* ((out (assoc-ref outputs "out")))
|
||
(substitute* (string-append out "/lib/libc.so")
|
||
(("/[^ ]+/lib/libc.so.0.3")
|
||
(string-append out "/lib/libc.so.0.3"
|
||
" libmachuser.so libhurduser.so"))))
|
||
#t)))
|
||
'())))))
|
||
|
||
;; Shadow the native "kernel-headers" because glibc's recipe expects the
|
||
;; "kernel-headers" input to point to the right thing.
|
||
(propagated-inputs `(("kernel-headers" ,xheaders)))
|
||
|
||
(native-inputs `(("cross-gcc" ,xgcc)
|
||
("cross-binutils" ,xbinutils)
|
||
,@(if (target-hurd? target)
|
||
`(("cross-mig"
|
||
,@(assoc-ref (package-native-inputs xheaders)
|
||
"cross-mig")))
|
||
'())
|
||
,@(package-inputs libc) ;FIXME: static-bash
|
||
,@(package-native-inputs libc))))))
|
||
|
||
|
||
;;; Concrete cross tool chains are instantiated like this:
|
||
;;
|
||
;; (define-public xgcc-armhf
|
||
;; (let ((triplet "arm-linux-gnueabihf"))
|
||
;; (cross-gcc triplet
|
||
;; #:xbinutils (cross-binutils triplet)
|
||
;; #:libc (cross-libc triplet))))
|
||
;;
|
||
;;; We don't do that here because we'd be referring to bindings from (gnu
|
||
;;; packages gcc) from the top level, which doesn't play well with circular
|
||
;;; dependencies among modules.
|