bug#53925: closed ([PATCH 0/2] gnu: clang: Build and link as shared libr

clang-tools-extra has been moved to a separate "extra" output due to the size of the statically linked binaries. Unfortunately, this prevents tools from finding the header files stored in the default clang "out" output:

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$ guix describe

Generation 1 Feb 08 2022 14:30:38 (current)
guix 59892f1
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: 59892f105585a98bcaaa4abc99142944cb171acf

$ cat main.cpp

#include <iostream>

int main() {
std::cout << "Hello, World!" << std::endl;
return 0;
}

$ guix shell clang clang:extra

$ clang-tidy main.cpp --

1776 warnings and 1 error generated.

Error while processing /efs/devel/hello/src/main.cpp.
/gnu/store/i86pbiqnnz0c2313616jdbsbdgp7qvav-profile/include/wchar.h:35:10: error: 'stddef.h' file not found [clang-diagnostic-error]
#include <stddef.h>
^~~~~~~~~~
Suppressed 1776 warnings (1776 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
Found compiler error(s).

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After applying the attached patch the tool does find the necessary header file (at /gnu/store/*-clang-13.0.1/lib/clang/13.0.1/include/stddef.h):

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$ ./pre-inst-env guix shell clang

$ clang-tidy main.cpp --

1971 warnings generated.
Suppressed 1971 warnings (1971 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.

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The patch builds clang with dynamic linkage and removes the separate output. The new size of the full complement of dynamically linked libraries and binaries is one-third the size of the original clang with extras excluded.

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$ guix size clang

store item total self
/gnu/store/ylbcqp3yjha97g450g33cz9grsg0ic2w-clang-13.0.1 1247.5 628.0 50.3%
...

total: 1247.5 MiB

$ ./pre-inst-env guix size clang
store item total self
/gnu/store/fxf9gyx7c790kbbzhyyamdf27g8yjb9v-clang-13.0.1 842.1 222.6 26.4%
...

total: 842.1 MiB

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I successfully built all dependent packages of the affected clang versions (clang@10 through 13) except c-vise-2.4.0, for which I have included a patch, and the following packages currently failing on master:

clang-toolchain-8.0.0
dub@1.7.2
gtkd@3.9.0

icedove-wayland@91.5
itk-snap@3.8.0
java-pep-adapter-2.1.23
rdmd@2.077.1
rust-aom-sys-0.3.0
rust-bindgen-0.52.0
rust-bindgen-0.55.1
rust-clang-sys-0.26.4
rust-sequoia-openpgp-0.9.0
scregseg-0.1.1

Greg

From:	GNU bug Tracking System
Subject:	bug#53925: closed ([PATCH 0/2] gnu: clang: Build and link as shared libraries.)
Date:	Wed, 16 Feb 2022 15:57:01 +0000