bug#29644: gcc-objc is unusable without its 'gcc' executable

bug#29644: gcc-objc is unusable without its 'gcc' executable

[宋文武]

Hello, unlike fortran program files which can be compiled using the
command 'gfortran' (in addition to 'gcc'), there is no other command for
Objective-C program files, and run 'gcc -c x.m' using the 'gcc' package
will just complain "Objective-C compiler not installed on this system"
due to it lacking objc support.

I have to revert commit 82f145ef7a to get a objc enabled 'gcc' in the
'gcc-objc' package.

IIUC, the purpose of that commit is to avoid file collisions between
'gfortran' and the 'gcc' package used in the 'gnu-build-system', which
will broke the compiler in some way.  So I think we really want to only
have one gcc package in an environment...

How about enable all languages (except 'brig' which I never heard of)
for the gcc-final and the 'gcc' (in gcc.scm) packages?  In this way, I
think 'gnu-build-system' and 'gcc-toolchain' will able to compile
Fortran, Objective-C, Go, etc. out of the box.

bug#29644: gcc-objc is unusable without its 'gcc' executable

[Ricardo Wurmus]

宋文武 <iyzsong@member.fsf.org> writes:

> Hello, unlike fortran program files which can be compiled using the
> command 'gfortran' (in addition to 'gcc'), there is no other command for
> Objective-C program files, and run 'gcc -c x.m' using the 'gcc' package
> will just complain "Objective-C compiler not installed on this system"
> due to it lacking objc support.
>
> I have to revert commit 82f145ef7a to get a objc enabled 'gcc' in the
> 'gcc-objc' package.

In May 2016 I first noticed this problem with GCC and investigated
solutions.

The fix here is to patch “lang-spec.h”, so that it does not limit the
gcc executable to the configured set of languages.  This way we will be
able to use the same gcc executable with different languages.

--
Ricardo

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bug#29644: gcc-objc is unusable without its 'gcc' executable.

[Zhu Zihao]

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I'm planning to package some GNUStep packages to Guix, but the gcc-objc
is broken.

Any one interested in fixing GCC? or I' ll plan to make gnustep-make use
clang instead of GCC.
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bug#29644: gcc-objc is unusable without its 'gcc' executable.

[Maxime Devos]

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Zhu Zihao schreef op za 26-03-2022 om 13:49 [+0800]:
> I'm planning to package some GNUStep packages to Guix, but the gcc-
> objc is broken.
> 
> Any one interested in fixing GCC? [...]

How is it broken?  Is there some error message or something?

Greetings,
Maxime.

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bug#29644: gcc-objc is unusable without its 'gcc' executable.

[Zhu Zihao]

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You can try with (on d05fcc21cb9509084a0424e6808b84b58dc52d62, but I
guess the commit doesn't matters.)

```
guix shell gcc@10 gcc-objc@10 clang@13

cat > hello.m << "EOF"
#include <stdio.h>

int main(int argc, const char * argv[]) {
  printf ("Hello, world!\n");
    return 0;
}
EOF
```

`LANG=C gcc hello.m -o hello` complains that Objective-C compiler is not
installed.

`LANG=C clang hello.m -o hello` can compile to hello binary.

Even I try set environment variable GCC_EXEC_PREFIX (described in
https://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html)

GCC_EXEC_PREFIX=$GUIX_ENVIRONMENT/libexec/gcc/x86_64-unknown-linux-gnu/10.3.0 gcc hello.m -o hello
 
or pass option
`-B$GUIX_ENVIRONMENT/libexec/gcc/x86_64-unknown-linux-gnu/10.3.0`. It
still says no Objective-C compiler.


Maxime Devos <maximedevos@telenet.be> writes:

> [[PGP Signed Part:Undecided]]
> Zhu Zihao schreef op za 26-03-2022 om 13:49 [+0800]:
>> I'm planning to package some GNUStep packages to Guix, but the gcc-
>> objc is broken.
>> 
>> Any one interested in fixing GCC? [...]
>
> How is it broken?  Is there some error message or something?
>
> Greetings,
> Maxime.
>
> [[End of PGP Signed Part]]


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bug#29644: gcc-objc is unusable without its 'gcc' executable.

[Maxime Devos]

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Zhu Zihao schreef op za 26-03-2022 om 18:53 [+0800]:
> `LANG=C gcc hello.m -o hello` complains that Objective-C compiler is
> not installed.

I noticed the output of "guix build gcc-objc" does not contain any
binaries in 'bin' and neither does there appear to be some objc shared
library.  I guess this is caused by the following line:

           (add-after 'install 'remove-broken-or-conflicting-files
             (lambda* (#:key outputs #:allow-other-keys)
               (for-each
                delete-file
                (find-files (string-append (assoc-ref outputs "out")
"/bin")
                            ".*(c\\+\\+|cpp|g\\+\\+|gcov|gcc|lto)(-
.*)?$"))))))))))


I'm wondering if any of the following commits fix or break things:

  * 5318bade32e2a3a801e838286439074aeaf1e3c7
    (this one modified the regex)
  * a159586f8ae4db8a0fcf608b411f962817c3db60
    (the commit before)
  * 82f145ef7aef8f4d28a144ee8efcadf3fdd4b877 
    (this one introduced the phase)
  * ce6027bf43210d0b68bb26dbf110ca6c47aa8478
    (the commit before)

Make sure to run this in an environment "guix environment --pure --ad-hoc gcc-objc"
(*) without the "gcc" package, to avoid the gcc package overriding the
hypothetical gcc from the "gcc-objc" package.

Or maybe some plugin architecture is used, I don't know..

Greetings,
Maxime.

(*) some of these commits are from before the introduction of "guix shell"

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bug#29644: gcc-objc is unusable without its 'gcc' executable.

[Zhu Zihao]

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Maxime Devos <maximedevos@telenet.be> writes:

> Or maybe some plugin architecture is used, I don't know..

I think the problem is pointed out by Ricardo Wurmus in this reply https://issues.guix.gnu.org/29644#1
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bug#29644: gcc-objc is unusable without its 'gcc' executable.

[Maxime Devos]

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Zhu Zihao schreef op za 26-03-2022 om 22:14 [+0800]:
> Maxime Devos <maximedevos@telenet.be> writes:
> 
> > Or maybe some plugin architecture is used, I don't know..
> 
> I think the problem is pointed out by Ricardo Wurmus in this reply https://issues.guix.gnu.org/29644#1

Ok, I thought this was a new bug report, but apparently it is a reply
to an old report.

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bug#29644: gcc-objc is unusable without its 'gcc' executable

[Vivien Kraus via Bug reports for GNU Guix]

Hello!

I would like to learn and play with gnustep with objective-C, but it
seems like GCC does not come with objective-C in Guix.

I don’t know much about GCC or how Guix packages it. There is an early
comment by Ricardo Wurmus:

> The fix here is to patch “lang-spec.h”, so that it does not limit the
> gcc executable to the configured set of languages.  This way we will
> be
> able to use the same gcc executable with different languages.

The source of gcc-objc has a file named gcc-12.3.0/gcc/objc/lang-
specs.h that claims to be included as a static array literal, but I
don’t know what the rest of this citation means.

Vivien

bug#29644: gcc-objc is unusable without its 'gcc' executable

[Efraim Flashner]

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On Sat, Sep 02, 2023 at 11:01:44PM +0200, Vivien Kraus via Bug reports for GNU Guix wrote:
> Hello!
> 
> I would like to learn and play with gnustep with objective-C, but it
> seems like GCC does not come with objective-C in Guix.
> 
> I don’t know much about GCC or how Guix packages it. There is an early
> comment by Ricardo Wurmus:
> 
> > The fix here is to patch “lang-spec.h”, so that it does not limit the
> > gcc executable to the configured set of languages.  This way we will
> > be
> > able to use the same gcc executable with different languages.
> 
> The source of gcc-objc has a file named gcc-12.3.0/gcc/objc/lang-
> specs.h that claims to be included as a static array literal, but I
> don’t know what the rest of this citation means.

I've appended a diff of the lib output of gcc and gcc-objc. According to
du adding objc support to regular gcc would increase the lib output by
368K. I think our best option is to move forward with adding objc/objc++
as languages which gcc simply provides without needing a separate
package.


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1c1
< /gnu/store/sxnv230gv2mj5x9v3gfadw118gkl2rcf-gcc-10.5.0-lib/
---
> /gnu/store/1p8hc8mrigismnndycwih2k2015v0z1q-gcc-objc-10.5.0-lib/
78a79,89
> │   │           │   ├── objc
> │   │           │   │   ├── message.h
> │   │           │   │   ├── NXConstStr.h
> │   │           │   │   ├── objc-decls.h
> │   │           │   │   ├── objc-exception.h
> │   │           │   │   ├── objc.h
> │   │           │   │   ├── objc-sync.h
> │   │           │   │   ├── Object.h
> │   │           │   │   ├── Protocol.h
> │   │           │   │   ├── runtime.h
> │   │           │   │   └── thr.h
645a657,661
> │   ├── libobjc.a
> │   ├── libobjc.la
> │   ├── libobjc.so -> libobjc.so.4.0.0
> │   ├── libobjc.so.4 -> libobjc.so.4.0.0
> │   ├── libobjc.so.4.0.0
682c698
<     │   └── gcc-10.5.0
---
>     │   └── gcc-objc-10.5.0
697c713
< 34 directories, 661 files
---
> 35 directories, 676 files

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