Bash 4.2.0(1)-release, which we use during bootstrap, does not yield the
"x" case in:

  case x"$EMULATION_NAME" in x) ;; *) ;; esac

when 'EMULATION_NAME' is undefined.  Bash 4.3.30(1)-release doesn't have this
problem.  Work around it.

This Bash bug was fixed
in <http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.

--- a/ld/emulparams/elf32bmipn32-defs.sh
+++ b/ld/emulparams/elf32bmipn32-defs.sh
@@ -13,7 +13,7 @@ LITTLE_OUTPUT_FORMAT="elf32-littlemips"
 TEMPLATE_NAME=elf32
 EXTRA_EM_FILE=mipself
 
-case x"$EMULATION_NAME" in
+case "x$EMULATION_NAME" in
 xelf32*n32*) ELFSIZE=32 ;;
 xelf64*) ELFSIZE=64 ;;
 x) ;;
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<div class='path'>path: <a href='/guix/log/?id=59cf26292f8aa13c4a98687371a2dafa63ccc932'>root</a>/<a href='/guix/log/gnu?id=59cf26292f8aa13c4a98687371a2dafa63ccc932'>gnu</a>/<a href='/guix/log/gnu/tests.scm?id=59cf26292f8aa13c4a98687371a2dafa63ccc932'>tests.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/tests.scm?id=59cf26292f8aa13c4a98687371a2dafa63ccc932&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-25 23:37:06 +0100'>2019-03-25</span></td><td><a href='/guix/commit/gnu/tests.scm?id=cf848cc0a17a3a58d600116896f6e7abfb0440d4'>accounts: Add default value for the 'home-directory' field of &lt;user-account&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-08-29 23:32:01 +0200'>2018-08-29</span></td><td><a href='/guix/commit/gnu/tests.scm?id=d258c791441b46705f4360cf141343363d1751f2'>tests: Warn about test module load failures.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-28 13:24:19 +0200'>2018-05-28</span></td><td><a href='/guix/commit/gnu/tests.scm?id=9ceeca0880248eee8c2796f5e6ebc172b95277f7'>system: Remove uses of the 'title' field of &lt;file-system&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-02-19 22:04:11 +0100'>2018-02-19</span></td><td><a href='/guix/commit/gnu/tests.scm?id=27a2c9c3e071fdb380c2f4f389b7cf4008dc75f7'>marionette: Use QEMU's "VM channel" mechanism.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-01-09 20:02:26 +0100'>2018-01-09</span></td><td><a href='/guix/commit/gnu/tests.scm?id=16d78a8f7207271e662d9152150b0cf790492373'>tests: marionette-operating-system: Add initrd parameter and kernel-arguments.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2017-12-06 15:02:24 +0100'>2017-12-06</span></td><td><a href='/guix/commit/gnu/tests.scm?id=fdfdecdb7ebfd05b4ae66cc5140078dbfc10fc35'>gnu, doc, tests: Use ‘bootloader-configuration’ everywhere.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-08-23 22:23:19 +0200'>2017-08-23</span></td><td><a href='/guix/commit/gnu/tests.scm?id=045ebb3e58d74c75f39ce47380045d3cd00359c3'>gnu: bootloader: Deprecate "device" field in favor of "target".</a><span class='msg-avail'>...</span></td><td>Andy Wingo</td></tr>
<tr><td><span title='2017-05-16 14:41:01 +0200'>2017-05-16</span></td><td><a href='/guix/commit/gnu/tests.scm?id=b09a8da4a2e50845a297e041762f3ff9e649c047'>bootloader: Add extlinux support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2017-05-04 18:05:05 +0200'>2017-05-04</span></td><td><a href='/guix/commit/gnu/tests.scm?id=67d84d6335ae84ac7c217061570e6b968060073c'>tests: Use 'fold-module-public-variables' for discovery.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-05-03 23:50:15 +0200'>2017-05-03</span></td><td><a href='/guix/commit/gnu/tests.scm?id=cd903ef7871170d3c4eced45418459d293ef48a7'>Add (guix discovery).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-01 00:45:18 +0200'>2017-04-01</span></td><td><a href='/guix/commit/gnu/tests.scm?id=892d9089a88abaa2ef1127f16308d03f4f08a4ce'>tests: Introduce 'simple-operating-system' and use it.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-07-12 22:47:08 +0200'>2016-07-12</span></td><td><a href='/guix/commit/gnu/tests.scm?id=a91c3fc727ba90d8c9b91f67fb672da2e6b877ad'>services: &lt;shepherd-service&gt; no longer has an 'imported-modules' field.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-06-27 21:41:38 +0200'>2016-06-27</span></td><td><a href='/guix/commit/gnu/tests.scm?id=037f9e07cd03d6894a6b5fc9a252c34d3b163962'>tests: 'marionette-service-type' nows takes a &lt;marionette-configuration&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-06-20 23:50:46 +0200'>2016-06-20</span></td><td><a href='/guix/commit/gnu/tests.scm?id=98b65b5ff6b1dea0ad58b0f47dd163c32d0cbf6e'>tests: Add a mechanism to describe and discover system tests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-06-20 23:50:46 +0200'>2016-06-20</span></td><td><a href='/guix/commit/gnu/tests.scm?id=94b4274d0dc5768bac255980c7e785bd3dff261f'>tests: Add system installation test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-06-20 00:52:53 +0200'>2016-06-20</span></td><td><a href='/guix/commit/gnu/tests.scm?id=ca7a68ebeb5039883cd43b6165ba1915b0974a41'>tests: Fix list of exports in (gnu tests).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>