GNU logs - #47648, boring messages

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Subject: bug#47648: cc-for-target makes --with-c-toolchain unusable for some packages
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I tried compiling lua with clang on a whim and found out about
cc-for-target. Not sure if that's the only instance of hardcoded gcc,
but it's certainly a prominent one.

What would be the idiomatic way to fix it? Detect clang dynamically? Or
move cc-for-target inside the build system module and make it available
at build time?

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Subject: bug#47648: Acknowledgement (cc-for-target makes --with-c-toolchain
 unusable for some packages)
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Subject: bug#47648: cc-for-target makes --with-c-toolchain unusable for some packages
Resent-From: Maxime Devos <maximedevos@HIDDEN>
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On Thu, 2021-04-08 at 02:33 +0200, raingloom wrote:
> I tried compiling lua with clang on a whim and found out about
> cc-for-target. Not sure if that's the only instance of hardcoded gcc,
> but it's certainly a prominent one.

A little more information:
this is not specific to cc-for-target.  Try searching for "CC=3Dgcc".

Most uses of "CC=3Dgcc" are incorrect when cross-compiling.  When
cross-compiling, these should be "CC=3DARCHITECTURE-linux-gnu-gcc" or
something like that.  The "cc-for-target" procedure outputs the correct
string.

> What would be the idiomatic way to fix it? Detect clang dynamically? Or
> move cc-for-target inside the build system module and make it available
> at build time?

To avoid massive rebuilds, perhaps the procedure "cc-for-target" could be
replaced with a macro "cc-for-target" that accesses the native-inputs of
this-package to determine whether it should output "CC=3Dgcc" /
"CC=3DARCHITECTURE-linux-gnu-gcc" or "CC=3Dclang" / "CC=3DARCHITECTURE-linu=
x-gnu-clang"?

Also, moving cc-for-taget to the build system module would require changing
existing package definitions:
  ,(string-append "CC=3D" (cc-for-target)) --> (string-append "CC=3D" (cc-f=
or-target))
  (string-append "CC=3D" ,(cc-for-target)) --> (string-append "CC=3D" (cc-f=
or-targt))

Warning: I haven't tested whether this approach works with --with-c-toolcha=
in.

Greetings,
Maxime.

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severity 47648 important
quit

Last modified: Fri, 16 Apr 2021 16:00:02 UTC

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