gnu: clang-runtime-18: Build with gcc-13.

Avoid

    In file included from /tmp/guix-build-clang-runtime-18.1.8.drv-0/source/build/lib/fuzzer/libcxx_fuzzer_x86_64/include/c++/v1/__exception/nested_exception.h:18,
                     from /tmp/guix-build-clang-runtime-18.1.8.drv-0/source/build/lib/fuzzer/libcxx_fuzzer_x86_64/include/c++/v1/exception:83,
                     from /tmp/guix-build-clang-runtime-18.1.8.drv-0/source/libcxxabi/src/cxa_aux_runtime.cpp:13:
    /tmp/guix-build-clang-runtime-18.1.8.drv-0/source/build/lib/fuzzer/libcxx_fuzzer_x86_64/include/c++/v1/__type_traits/is_convertible.h:28:77: error: there are no arguments to ‘__is_convertible’ that depend on a template parameter, so a declaration of ‘__is_convertible’ must be available [-fpermissive]
       28 | struct _LIBCPP_TEMPLATE_VIS is_convertible : public integral_constant<bool, __is_convertible(_T1, _T2)> {};

by using gcc-13.

* gnu/packages/llvm.scm (clang-runtime-from-llvm)[native-inputs]: Use gcc-13
for version 18.

Change-Id: Ib01403665af7a8014e6da612bc6f31257e498d88

gnu: clang-runtime-18: Build with gcc-12.

Avoid

    source/build/lib/fuzzer/libcxx_fuzzer_x86_64/include/c++/v1/__filesystem/path.h:534:52: error: use of built-in trait ‘__remove_pointer(typename std::__Fuzzer::decay<_Tp>::type)’ in function signature; use library traits instead

by reverting back to gcc-12.

* gnu/packages/llvm.scm (clang-runtime-from-llvm)[native-inputs]: Use gcc-12
for version 18.

Change-Id: Ib01403665af7a8014e6da612bc6f31257e498d88

gnu: clang-runtime: Remove gcc-12,13,14 from native-inputs.

* gnu/packages/llvm.scm (clang-runtime-from-llvm)[native-inputs]: Use
llvm's native inputs unmodified.

Change-Id: Ib01403665af7a8014e6da612bc6f31257e498d88

gnu: gcc: Update gcc, gcc-toolchain, libgccjit to 14.

* gnu/packages/gcc.scm (gcc): Define as gcc-14 for all.
(libgccjit): Define as libgccjit-14.
* gnu/packages/commencement.scm (gcc-toolchain): Define as gcc-toolchain-14
for all.
* gnu/packages/gcc.scm

Change-Id: Iaac983da8acbbb2fd1088a0469d6115b7d424dbb

gnu: netcdf: Fix build with gcc-14.

* gnu/packages/maths.scm (netcdf): Add CFLAGS to #:configure-flags to relax
gcc-14's strictness.

Change-Id: Ic5059519414aeb644dd0bde084f569b954c17904

gnu: python-h5py: Fix build with gcc-14.

* gnu/packages/python-xyz.scm (python-h5py)[arguments]: Add phase
"relax-gcc-14-strictness".

Change-Id: Ib68eb41305d075069926323727fe35ca65fd2873

gnu: openmpi-4: Fix build with gcc-14.

* gnu/packages/mpi.scm (openmpi-4)[arguments]: Add CFLAGS to #:configure-flags
to relax gcc-14's strictness.

Change-Id: I4a19a473a729ce054d855ec2c4d6ea94dc94b849

gnu: freeipmi: Fix build with gcc-14.

* gnu/packages/freeipmi.scm (freeipmi)[arguments]: Add CFLAGS to #:configure-flags
to relax gcc-14's strictness.

Change-Id: Ie22de7f0a344bbc709878be3175fdd07cfde92bc

gnu: libunwind: Fix build with gcc-14 for i686-linux.

* gnu/packages/libunwind.scm (libunwind)[arguments]: Extend CFLAGS to relax
gcc-14's strictness even further.

Change-Id: Idafb16976442b3452b16cd993fbaec0655a61af5

gnu: icedtea-8: Fix build with gcc-14.

* gnu/packages/java.scm (icedtea-8)[arguments]: Extend CFLAGS to relax
gcc-14's strictness.

Change-Id: Ia7a53bfd1649c54505d7d2d033f9e984c531da90

gnu: icedtea-7: Fix build with gcc-14.

* gnu/packages/java.scm (icedtea-7)[arguments]: Extend CFLAGS_COMMON in
"fix-openjdk" to relax gcc-14's strictness.

Change-Id: Icc2fec77390dfd052339184633c1c30915ebded2

gnu: gnome-boxes: Fix build with gcc-14.

* gnu/packages/gnome.scm (gnome-boxes)[arguments]: Add phase
"relax-gcc-14-strictness".

Change-Id: I0d29ddcc368d56c572caea0fb55fa15618193bc1

gnu: guile-gi: Fix build with gcc-14.

* gnu/packages/guile-xyz.scm (guile-gi)[arguments]: Add CFLAGS
to #:configure-flags to relax gcc-14's strictness.

Change-Id: I1aa6b2118f09e12e3ce06833e56d624fd047a9ae

gnu: gnome-recipes: Fix build with gcc-14.

* gnu/packages/gnome.scm (gnome-recipes)[arguments]: Add phase
"relax-gcc-14-strictness".

Change-Id: I1d9bc4ee914a0b6ffdabced3fa8febee5feacc30

gnu: pidgin: Fix build with gcc-14.

* gnu/packages/messaging.scm (pidgin)[arguments]: Extend CFLAGS to relax
gcc-14's strictness.

Change-Id: Ic36a32d02d3051ea7639c2d47933b0293b72fb89

gnu: libbraille: Fix build with gcc-14.

* gnu/packages/accessibility.scm (libbraille)[arguments]: Add CFLAGS to #:configure-flags
to relax gcc-14's strictness.

Change-Id: Id16c1f46d2f613a2cc878c9be6b88b3e613091e1

gnu: gucharmap: Fix build with gcc-14.

* gnu/packages/gnome.scm (gucharmap)[argument]: Add CFLAGS to #:configure-flags
to relax gcc-14's strictness.

Change-Id: I234d21da13a688029e306a793d5348e17c6c9042

gnu: libcdio: Fix build with gcc-14.

* gnu/packages/cdrom.scm (libcdio)[arguments]: New field to relax gcc-14's
strictness.

Change-Id: I7ae22b1017060015e980331f9943b33459926193

gnu: cogl: Fix build with gcc-14.

* gnu/packages/gnome.scm (cogl)[arguments]: Add CFLAGS to #:configure-flags to
relax gcc-14's strictness.

Change-Id: I05c4923c6e2ed60b892d3beef2967fff18cdeb56

gnu: python-cython-next: Build with gcc-13.

Using gcc-14 produces

    Compiler output for module e_switch_transform:
    e_switch_transform.c: In function ‘__pyx_pf_18e_switch_transform_is_not_one’:
    e_switch_transform.c:2283:5: error: duplicate case value
     2283 |     case 1+0:
          |     ^~~~
    e_switch_transform.c:2282:5: note: previously used here
     2282 |     case 1:
          |     ^~~~

* gnu/packages/python-xyz.scm (python-cython-3)[native-inputs]: Add gcc-13.

Change-Id: Iaed502e4c105bb1229345288ec2f203453f65acc