cc-for-target makes --with-c-toolchain unusable for some packages

OpenSubmitted by raingloom.
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2 participants
  • Maxime Devos
  • raingloom
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raingloom wrote 7 days ago
(name . Guix Bugs)(address . bug-guix@gnu.org)
20210408023329.4e6d48d7@riseup.net
I tried compiling lua with clang on a whim and found out aboutcc-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? Ormove cc-for-target inside the build system module and make it availableat build time?
M
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Maxime Devos wrote 2 days ago
0139952bd05c10e068ce564d7982a90b032d9874.camel@telenet.be
On Thu, 2021-04-08 at 02:33 +0200, raingloom wrote:
Toggle quote (4 lines)> 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=gcc".
Most uses of "CC=gcc" are incorrect when cross-compiling. Whencross-compiling, these should be "CC=ARCHITECTURE-linux-gnu-gcc" orsomething like that. The "cc-for-target" procedure outputs the correctstring.
Toggle quote (4 lines)> 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 bereplaced with a macro "cc-for-target" that accesses the native-inputs ofthis-package to determine whether it should output "CC=gcc" /"CC=ARCHITECTURE-linux-gnu-gcc" or "CC=clang" / "CC=ARCHITECTURE-linux-gnu-clang"?
Also, moving cc-for-taget to the build system module would require changingexisting package definitions: ,(string-append "CC=" (cc-for-target)) --> (string-append "CC=" (cc-for-target)) (string-append "CC=" ,(cc-for-target)) --> (string-append "CC=" (cc-for-targt))
Warning: I haven't tested whether this approach works with --with-c-toolchain.
Greetings,Maxime.
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