[PATCH 0/5] Wrappers for c compilers

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2 participants
  • Ludovic Courtès
  • Ryan Prior
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unassigned
Submitted by
Ryan Prior
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normal

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R
R
Ryan Prior wrote on 20 May 2020 17:51
(address . guix-patches@gnu.org)
20200521005046.19712-1-rprior@protonmail.com
As an end-user, I want to create a manifest that to hack on some code where
the upstream build system badly wants to use `cc' and provides no practical
way to avoid this. At present, I have to create symlinks myself or patch the
build system; either way is non-obvious to other people who might try and use
my manifest when I share it.

With this patch in Guix I can just specify `gcc-toolchain-wrapper' in my
manifest and have that be the end of it. For consistency's sake I have applied
this to all other c compilers I could find in Guix as well.

Ryan Prior (5):
gnu: Add tcc-wrapper.
gnu: Add pcc-wrapper.
gnu: Add gcc-toolchain-wrapper.
gnu: Add sdcc-wrapper.
gnu: Add bcc-wrapper.

gnu/packages/assembly.scm | 3 +++
gnu/packages/c.scm | 32 ++++++++++++++++++++++++++++++++
gnu/packages/commencement.scm | 3 +++
gnu/packages/sdcc.scm | 3 +++
4 files changed, 41 insertions(+)

--
2.26.2
R
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Ryan Prior wrote on 20 May 2020 17:57
[PATCH 2/5] gnu: Add pcc-wrapper.
(address . 41428@debbugs.gnu.org)
20200521005700.19948-2-rprior@protonmail.com
* gnu/packages/c.scm (pcc-wrapper): New variable.
---
gnu/packages/c.scm | 1 +
1 file changed, 1 insertion(+)

Toggle diff (11 lines)
diff --git a/gnu/packages/c.scm b/gnu/packages/c.scm
index 757cfa7fba..e83a1d5c61 100644
--- a/gnu/packages/c.scm
+++ b/gnu/packages/c.scm
@@ -319,3 +319,4 @@ releases.")
under the name @command{cc}.")))))
(define-public tcc-wrapper (wrap-cc tcc))
+(define-public pcc-wrapper (wrap-cc pcc))
--
2.26.2
R
R
Ryan Prior wrote on 20 May 2020 17:57
[PATCH 1/5] gnu: Add tcc-wrapper.
(address . 41428@debbugs.gnu.org)
20200521005700.19948-1-rprior@protonmail.com
* gnu/packages/c.scm (tcc-wrapper): New variable.
* gnu/packages/c.scm (wrap-cc): New variable.
---
gnu/packages/c.scm | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)

Toggle diff (48 lines)
diff --git a/gnu/packages/c.scm b/gnu/packages/c.scm
index 5718ec66ac..757cfa7fba 100644
--- a/gnu/packages/c.scm
+++ b/gnu/packages/c.scm
@@ -7,6 +7,7 @@
;;; Copyright © 2019 Guillaume Le Vaillant <glv@posteo.net>
;;; Copyright © 2019 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;; Copyright © 2020 Ryan Prior <rprior@protonmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -288,3 +289,33 @@ address space pointers point to, or what locks a function acquires or
releases.")
(home-page "https://sparse.wiki.kernel.org/index.php/Main_Page")
(license license:expat)))
+
+(define-public wrap-cc
+ (lambda* (cc #:optional
+ (bin (package-name cc))
+ (name (string-append (package-name cc) "-wrapper")))
+ (package/inherit cc
+ (name name)
+ (source #f)
+ (build-system trivial-build-system)
+ (outputs '("out"))
+ (native-inputs '())
+ (inputs '())
+ (propagated-inputs `(("cc" ,cc)))
+ (arguments
+ `(#:modules ((guix build utils))
+ #:builder
+ (begin
+ (use-modules (guix build utils))
+ (let ((bin-dir (string-append (assoc-ref %build-inputs "cc") "/bin/"))
+ (wrapper-dir (string-append (assoc-ref %outputs "out") "/bin/")))
+ (mkdir-p wrapper-dir)
+ (symlink (string-append bin-dir ,bin)
+ (string-append wrapper-dir "cc"))))))
+ (synopsis (string-append "Wrapper for " bin))
+ (description
+ (string-append
+ "Wraps " (package-name cc) " such that @command{" bin "} can be invoked
+under the name @command{cc}.")))))
+
+(define-public tcc-wrapper (wrap-cc tcc))
--
2.26.2
R
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Ryan Prior wrote on 20 May 2020 17:57
[PATCH 3/5] gnu: Add gcc-toolchain-wrapper.
(address . 41428@debbugs.gnu.org)
20200521005700.19948-3-rprior@protonmail.com
* gnu/packages/commencement.scm (gcc-toolchain-wrapper): New variable.
---
gnu/packages/commencement.scm | 3 +++
1 file changed, 3 insertions(+)

Toggle diff (16 lines)
diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index 59ef5d078b..e6ef3c301c 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -3870,6 +3870,9 @@ binaries, plus debugging symbols in the @code{debug} output), and Binutils.")
(define-public gcc-toolchain
(make-gcc-toolchain gcc-final))
+(define-public gcc-toolchain-wrapper
+ (wrap-cc gcc-toolchain "gcc"))
+
(define-public gcc-toolchain-4.8
(make-gcc-toolchain gcc-4.8))
--
2.26.2
R
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Ryan Prior wrote on 20 May 2020 17:57
[PATCH 4/5] gnu: Add sdcc-wrapper.
(address . 41428@debbugs.gnu.org)
20200521005700.19948-4-rprior@protonmail.com
* gnu/packages/sdcc.scm (sdcc-wrapper): New variable.
---
gnu/packages/sdcc.scm | 3 +++
1 file changed, 3 insertions(+)

Toggle diff (20 lines)
diff --git a/gnu/packages/sdcc.scm b/gnu/packages/sdcc.scm
index 6d05470101..a95ef2ac0f 100644
--- a/gnu/packages/sdcc.scm
+++ b/gnu/packages/sdcc.scm
@@ -20,6 +20,7 @@
(define-module (gnu packages sdcc)
#:use-module (gnu packages bison)
#:use-module (gnu packages boost)
+ #:use-module (gnu packages c)
#:use-module (gnu packages flex)
#:use-module (gnu packages python)
#:use-module (gnu packages texinfo)
@@ -68,3 +69,5 @@ HC08-based (hc08, s08), Zilog Z80-based MCUs (z80, z180, gbz80, Rabbit
Work is in progress on supporting the Microchip PIC16 and PIC18 targets.
It can be retargeted for other microprocessors.")
(license license:gpl2+)))
+
+(define-public sdcc-wrapper (wrap-cc sdcc))
--
2.26.2
R
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Ryan Prior wrote on 20 May 2020 17:57
[PATCH 5/5] gnu: Add bcc-wrapper.
(address . 41428@debbugs.gnu.org)
20200521005700.19948-5-rprior@protonmail.com
* gnu/packages/assembly.scm (bcc-wrapper): New variable.
---
gnu/packages/assembly.scm | 3 +++
1 file changed, 3 insertions(+)

Toggle diff (23 lines)
diff --git a/gnu/packages/assembly.scm b/gnu/packages/assembly.scm
index c775603445..a8fe135ded 100644
--- a/gnu/packages/assembly.scm
+++ b/gnu/packages/assembly.scm
@@ -36,6 +36,7 @@
#:use-module (gnu packages autotools)
#:use-module (gnu packages base)
#:use-module (gnu packages bison)
+ #:use-module (gnu packages c)
#:use-module (gnu packages compression)
#:use-module (gnu packages flex)
#:use-module (gnu packages gettext)
@@ -223,6 +224,8 @@ assembler, a C compiler and a linker. The assembler uses Intel syntax
(supported-systems '("i686-linux" "x86_64-linux"))
(license license:gpl2+)))
+(define-public bcc-wrapper (wrap-cc dev86 "bcc" "bcc-wrapper"))
+
(define-public libjit
(let ((commit "554c9f5c750daa6e13a6a5cd416873c81c7b8226"))
(package
--
2.26.2
L
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Ludovic Courtès wrote on 22 May 2020 02:42
Re: [bug#41428] [PATCH 0/5] Wrappers for c compilers
(name . Ryan Prior)(address . rprior@protonmail.com)(address . 41428@debbugs.gnu.org)
87d06wb916.fsf@gnu.org
Hi Ryan,

Ryan Prior <rprior@protonmail.com> skribis:

Toggle quote (10 lines)
> As an end-user, I want to create a manifest that to hack on some code where
> the upstream build system badly wants to use `cc' and provides no practical
> way to avoid this. At present, I have to create symlinks myself or patch the
> build system; either way is non-obvious to other people who might try and use
> my manifest when I share it.
>
> With this patch in Guix I can just specify `gcc-toolchain-wrapper' in my
> manifest and have that be the end of it. For consistency's sake I have applied
> this to all other c compilers I could find in Guix as well.

A long time ago, we decided against it, which is not to say that this is
set in stone but at least there’s a discussion to be had. :-)

For packages, the workaround usually boils down to setting shell or
Makefile variable ‘CC’ to “gcc” or similar. As for users, they can have
a shell alias.

In a nutshell, the reasons to not have a ‘cc’ program are that (1) it’s
easily worked around, and (2) our guideline is to follow what upstream
does, and none of these compilers provides a ‘cc’ program. (There are
threads in the mailing list archives discussing this.)

I’m personally in favor of the status quo on this topic.

Thoughts?

Thanks,
Ludo’.
R
R
Ryan Prior wrote on 22 May 2020 11:27
(name . Ludovic Courtès)(address . ludo@gnu.org)(address . 41428@debbugs.gnu.org)
IZgKyGkRb54dx__3SuILXblARLA5eBSphJSQxImJIxDVsV5PiTcMDij6Qdseefuc9vh_r0CCAvgv8nfJKNnjCcJF5Zm2v8WTcHeGfkHW_rY=@protonmail.com
On Friday, May 22, 2020 9:42 AM, Ludovic Courtès <ludo@gnu.org> wrote:

Toggle quote (2 lines)
> For packages, the workaround usually boils down to setting shell or Makefile variable ‘CC’ to “gcc” or similar.

Agreed, packages have what they need already.

Toggle quote (2 lines)
> As for users, they can have a shell alias.

At present, there's no way to specify a shell alias as part of an environment/profile manifest. These patches would fill that gap for this narrow use-case, as the `python-wrapper` package fills it for another narrow use case.

Toggle quote (2 lines)
> it’s easily worked around

Fair.

Toggle quote (3 lines)
> our guideline is to follow what upstream does, and none of these compilers provides a ‘cc’ program. (There are
> threads in the mailing list archives discussing this.)

I find this persuasive locally, but in a global sense it results in a less compelling end-user experience which outweighs my partiality towards this guideline.


Toggle quote (2 lines)
> I’m personally in favor of the status quo on this topic.

Thank you for weighing in!

My use-case, my vision, is that I want to provide end-users an environment manifest such that `guix environment -m build-env.scm` sets everything up so that `make && make check` succeed.

I created these wrappers in service of this vision, to save end-users the trouble of creating and managing aliases on a per-environment basis when they already don't have to do that using the working set they're familiar with. I want to position Guix as a total win for tooling simplicity; but a lot of small complexities, each of which is easily worked-around, add up quickly to undermine my message.

I would lose all interest in this patch set if I had a more general purpose way of extending a manifest with more things than just packages. I picture, for example, a manifest with three parts:

- packages
- env variables
- aliases

Right now afaict a manifest only has the first of those things. Given I've got this nice packagehammer, I'm inclined to insist upon the usefulness of this patch set as a means of turning `cc` into a nail.

But I'd be happier to use a better tool anyhow. What do y'all guix think is the best pattern to apply for my use case?


Sincerely,
Ryan
L
L
Ludovic Courtès wrote on 27 May 2020 14:01
(name . Ryan Prior)(address . rprior@protonmail.com)(address . 41428@debbugs.gnu.org)
875zchhz22.fsf@gnu.org
Hi,

Ryan Prior <rprior@protonmail.com> skribis:

Toggle quote (12 lines)
> My use-case, my vision, is that I want to provide end-users an environment manifest such that `guix environment -m build-env.scm` sets everything up so that `make && make check` succeed.
>
> I created these wrappers in service of this vision, to save end-users the trouble of creating and managing aliases on a per-environment basis when they already don't have to do that using the working set they're familiar with. I want to position Guix as a total win for tooling simplicity; but a lot of small complexities, each of which is easily worked-around, add up quickly to undermine my message.
>
> I would lose all interest in this patch set if I had a more general purpose way of extending a manifest with more things than just packages. I picture, for example, a manifest with three parts:
>
> - packages
> - env variables
> - aliases
>
> Right now afaict a manifest only has the first of those things. Given I've got this nice packagehammer, I'm inclined to insist upon the usefulness of this patch set as a means of turning `cc` into a nail.

I understand your goal and I agree that it’s good to avoid building a
pile of small complexities that all add up.

I don’t think lack of ‘cc’ is one them though. First, because it’s a
developer tool, and developers will know they can type ‘gcc’, ‘clang’,
or whatever, create an alias, etc. Second, because most build systems
(Autoconf-generated ‘configure’ scripts, CMake) accommodate the lack of
‘cc’, which thus goes unnoticed.

My 2¢!
Ludo’.
L
L
Ludovic Courtès wrote on 12 Jun 2020 09:12
control message for bug #41428
(address . control@debbugs.gnu.org)
87a7185kld.fsf@gnu.org
tags 41428 wontfix
close 41428
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