[lfs] 02/05: loongarch spec2026: ch06/bash: work around FTBFS with host GCC 15

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git pushed a commit to branch xry111/loongarch-12.0-spec2026
in repository lfs.

commit 9dbb1fac1cf48ea73aa9e408e50498e92db8fccf
Author: Xi Ruoyao <[email protected]>
AuthorDate: Sat May 2 23:21:04 2026 +0800

    loongarch spec2026: ch06/bash: work around FTBFS with host GCC 15
---
 chapter06/bash.xml | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/chapter06/bash.xml b/chapter06/bash.xml
index d00e685ca..331b22125 100644
--- a/chapter06/bash.xml
+++ b/chapter06/bash.xml
@@ -45,7 +45,8 @@
 
     <para>Prepare Bash for compilation:</para>
 
-<screen><userinput remap="configure">./configure --prefix=/usr                      \
+<screen><userinput remap="configure">CC_FOR_BUILD="gcc -std=gnu17" \
+./configure --prefix=/usr                      \
             --build=$(sh support/config.guess) \
             --host=$LFS_TGT                    \
             --without-bash-malloc</userinput></screen>
@@ -53,6 +54,21 @@
     <variablelist>
       <title>The meaning of the configure options:</title>
 
+      <varlistentry>
+        <term><parameter>CC_FOR_BUILD="gcc -std=gnu17"</parameter></term>
+        <listitem>
+          <para>The build system needs to compile some code generators
+          with the C compiler of the host distro (as we've discussed in
+          <xref linkend='ch-tools-toolchaintechnotes'/> it's not possible to
+          use the stage 1 or 2 GCC of LFS for this purpose).  If the host
+          distro ships GCC 15 or newer, the default C standard would
+          be C23 with GNU extensions (or maybe even newer), with that the
+          <quote>legacy</quote> code in the generators is not compatible.
+          Explicitly specify C17 with GNU extensions to work around the
+          issue.</para>
+        </listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><parameter>--without-bash-malloc</parameter></term>
         <listitem>

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