gcc: fix PR101749

https://wiki.linuxfromscratch.org/blfs/ticket/15350
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101749

chapter01/changelog.xml

@@ -42,6 +42,19 @@
     <listitem revision="sysv"> or <listitem revision="systemd"> as
     appropriate for the entry or if needed the entire day's listitem.
     -->
+    <listitem>
+      <para>2021-08-06</para>
+      <itemizedlist>
+        <listitem>
+          <para>[xry111] - Fix
+          <filename class="libraryfile">libasan.a</filename> building
+          GCC with Glibc-2.34.  Addresses
+          <ulink url="https://wiki.linuxfromscratch.org/blfs/ticket/15350">
+          BLFS #15350</ulink>.</para>
+        </listitem>
+      </itemizedlist>
+    </listitem>
+
     <listitem>
       <para>2021-08-02</para>
       <itemizedlist>

chapter08/gcc.xml

@@ -41,6 +41,14 @@
   <sect2 role="installation">
     <title>Installation of GCC</title>
 
+    <para>At first, fix an issue breaking
+    <filename class="libraryfile">libasan.a</filename> building this package
+    with Glibc-2.34:</para>
+
+<screen><userinput remap="pre">sed -e '/static.*SIGSTKSZ/d' \
+    -e 's/return kAltStackSize/return SIGSTKSZ * 4/' \
+    -i libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp</userinput></screen>
+
     <para>If building on x86_64, change the default directory name for 64-bit
     libraries to <quote>lib</quote>:</para>
 
@@ -124,10 +132,6 @@ su tester -c "PATH=$PATH make -k check"</userinput></screen>
     <!-- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101081 -->
     <para>Eight tests related to analyzer are known to fail.</para>
 
-    <!-- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101749 -->
-    <para>Seven tests related to <filename>pr59063-2.c</filename> are known
-    to fail.</para>
-
     <!-- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101751 -->
     <para>One test named <filename>asan_test.C</filename> is known to
     fail.</para>