The moc executable loops through headers on CPLUS_INCLUDE_PATH and stumbles
on the GCC internal _GLIBCXX_VISIBILITY macro.  Tell it to ignore it as it is
not supposed to be looking there to begin with.

Upstream report: https://bugreports.qt.io/browse/QTBUG-83160

diff --git a/src/tools/moc/main.cpp b/src/tools/moc/main.cpp
--- a/src/tools/moc/main.cpp
+++ b/src/tools/moc/main.cpp
@@ -188,6 +188,7 @@ int runMoc(int argc, char **argv)
     dummyVariadicFunctionMacro.arguments += Symbol(0, PP_IDENTIFIER, "__VA_ARGS__");
     pp.macros["__attribute__"] = dummyVariadicFunctionMacro;
     pp.macros["__declspec"] = dummyVariadicFunctionMacro;
+    pp.macros["_GLIBCXX_VISIBILITY"] = dummyVariadicFunctionMacro;
 
     QString filename;
     QString output;
='selected'>koszko</option>
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<tr><td><span title='2022-11-18 15:44:38 +0100'>2022-11-18</span></td><td><a href='/guix/commit/gnu/system/linux-initrd.scm?id=a6da50d60a2cc3d0f218e38cbc197011b8151554'>linux-initrd: raw-initrd: Add keyword argument #:pre-mount.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/linux-initrd.scm (raw-initrd): Add keyword argument #:pre-mount.
Document it.
* doc/guix.texi (initial RAM disk): Likewise.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Hilton Chain</td></tr>
<tr><td><span title='2022-03-01 10:30:17 -0500'>2022-03-01</span></td><td><a href='/guix/commit/gnu/system/linux-initrd.scm?id=0dc019e19a23fea614be5623360849ab9bc35e74'>initrd: Use non-hyphenated kernel command-line parameter names.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is to make it less surprising, given the common convention sets forth by
the kernel Linux command-line parameters.

* gnu/build/linux-boot.scm (boot-system): Rename '--load', '--repl', '--root'
and '--system' to 'gnu.load', 'gnu.repl', 'root' and 'gnu.system',
respectively.  Adjust doc.
(find-long-option): Adjust doc.
* gnu/installer/parted.scm (installer-root-partition-path): Adjust accordingly.
* gnu/system.scm (bootable-kernel-arguments): Add a VERSION argument and
update doc.  Use VERSION to conditionally return old style vs new style initrd
arguments.
(%boot-parameters-version): Increment to 1.
(operating-system-boot-parameters): Adjust doc.
(operating-system-boot-parameters-file): Likewise.
* gnu/system/linux-initrd.scm (raw-initrd, base-initrd): Likewise.
* doc/guix.texi: Adjust doc.
* gnu/build/activation.scm (boot-time-system): Adjust accordingly.
* gnu/build/hurd-boot.scm (boot-hurd-system): Likewise.
* gnu/packages/commencement.scm (%final-inputs-riscv64): Adjust comment.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-02-09 01:38:51 -0500'>2022-02-09</span></td><td><a href='/guix/commit/gnu/system/linux-initrd.scm?id=fd6cfbc05ac093a6b9497e6c38bb4678f33ac14d'>Revert kernel modules changes to support the Coreboot framebuffer</a><span class='msg-avail'>...<span class='msg-tooltip'>These changes broke the creation of the 'linux-modules-database' for all kernel
series besides 5.15, 5.4, and 5.10, like this:

------
gnu/build/linux-modules.scm:257:5: kernel module not found "framebuffer_coreboot" "/gnu/store/yff45fr6q93mw44zdql9ffr95zcvwxcn-linux-libre-4.9.299/lib/modules"
------

We should support the coreboot framebuffer, but we need to test that change more
completely before deploying it.

This effectively reverts the following commits:
1dfe8c372163d481ebebb97dd3b4cafa49906b28 "gnu: linux-libre: Build simplefb into all x86{,_64} kernels."
bc09e7ab569d5306ce99c5525150695c9d539ef0 "gnu: linux-libre: Support the Coreboot framebuffer."

Fixes &lt;https://issues.guix.gnu.org/52667&gt; "System reconfiguration fails to build
linux-modules.drv".
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2021-12-25 07:20:00 +0100'>2021-12-25</span></td><td><a href='/guix/commit/gnu/system/linux-initrd.scm?id=1dfe8c372163d481ebebb97dd3b4cafa49906b28'>gnu: linux-libre: Build simplefb into all x86{,_64} kernels.</a><span class='msg-avail'>...<span class='msg-tooltip'>This attempts to mitigate &lt;https://issues.guix.gnu.org/52667&gt;.

It makes linux-libre@5.15 consistent with older versions which do not
support a modular simplefb, allowing a single %base-initrd-modules
simple list for all of them.

Unlike CONFIG_FB_SIMPLE=m, CONFIG_FB_SIMPLE=y conflicts with
CONFIG_DRM_SIMPLEDRM, so the latter is now disabled.  Let us hope it is
not missed.

* gnu/packages/aux-files/linux-libre/5.15-i686.conf,
gnu/packages/aux-files/linux-libre/5.15-x86_64.conf:
Unset CONFIG_DRM_SIMPLEDRM to build in CONFIG_FB_SIMPLE=y.
* gnu/system/linux-initrd.scm (default-initrd-modules):
Remove "simplefb".
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>