Do not pass -dynamic-linker to linker when !shared.
Fixes <http://bugs.gnu.org/20102>.

ARM 'link' spec issue reported at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65711 and
https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01387.html.

Patch by Ludovic Courtès <ludo@gnu.org>.

--- gcc-4.8.4/gcc/config/arm/linux-elf.h.orig	2015-04-08 20:31:20.376900478 +0200
+++ gcc-4.8.4/gcc/config/arm/linux-elf.h	2015-04-08 20:31:36.437014437 +0200
@@ -65,7 +65,7 @@
    %{symbolic:-Bsymbolic} \
    %{!static: \
      %{rdynamic:-export-dynamic} \
-     -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
+     %{!shared:-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}} \
    -X \
    %{mbig-endian:-EB} %{mlittle-endian:-EL}" \
    SUBTARGET_EXTRA_LINK_SPEC
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<tr><td><span title='2022-06-04 12:04:23 +0200'>2022-06-04</span></td><td><a href='/guix/commit/tests/cache.scm?id=104b4e25ab7da5697f2f6f1ddfdd4955f05afece'>cache: Catch invalid 'last-expiry-cleanup'.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;http://issues.guix.gnu.org/55638&gt;.

* guix/cache.scm (maybe-remove-expired-cache-entries)[last-expiry-date]:
Use 'get-string-all' + 'string-&gt;number' instead of 'read'; ignore
invalid numbers.
* tests/cache.scm ("maybe-remove-expired-cache-entries, empty cache")
("maybe-remove-expired-cache-entries, corrupted cache"): New tests.

Co-authored-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
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