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diff --git a/build/unix/build-gcc/PR104142.patch b/build/unix/build-gcc/PR104142.patch
new file mode 100644
index 0000000000..d619510315
--- /dev/null
+++ b/build/unix/build-gcc/PR104142.patch
@@ -0,0 +1,54 @@
+From 8ce475543d784f8ce0f7e80f7faff39fa8eb92da Mon Sep 17 00:00:00 2001
+From: Jason Merrill <jason@redhat.com>
+Date: Mon, 11 Apr 2022 14:50:14 -0400
+Subject: [PATCH] c++: rodata and defaulted ctor [PR104142]
+
+Trivial initialization shouldn't bump a variable out of .rodata; if the
+result of build_aggr_init is an empty STATEMENT_LIST, throw it away.
+
+	PR c++/104142
+
+gcc/cp/ChangeLog:
+
+	* decl.cc (check_initializer): Check TREE_SIDE_EFFECTS.
+
+gcc/testsuite/ChangeLog:
+
+	* g++.dg/opt/const7.C: New test.
+---
+ gcc/cp/decl.c                     | 4 ++++
+ gcc/testsuite/g++.dg/opt/const7.C | 7 +++++++
+ 2 files changed, 11 insertions(+)
+ create mode 100644 gcc/testsuite/g++.dg/opt/const7.C
+
+diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
+index bffbd004167..7b0872cd55e 100644
+--- a/gcc/cp/decl.c
++++ b/gcc/cp/decl.c
+@@ -7227,6 +7227,10 @@ check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
+   if (init && init != error_mark_node)
+     init_code = build2 (INIT_EXPR, type, decl, init);
+ 
++  if (init_code && !TREE_SIDE_EFFECTS (init_code)
++      && init_code != error_mark_node)
++    init_code = NULL_TREE;
++
+   if (init_code)
+     {
+       /* We might have set these in cp_finish_decl.  */
+diff --git a/gcc/testsuite/g++.dg/opt/const7.C b/gcc/testsuite/g++.dg/opt/const7.C
+new file mode 100644
+index 00000000000..5bcf94897a8
+--- /dev/null
++++ b/gcc/testsuite/g++.dg/opt/const7.C
+@@ -0,0 +1,7 @@
++// PR c++/104142
++// { dg-do compile { target c++11 } }
++// { dg-additional-options -Wunused-variable }
++
++struct B { B()=default; };
++static const B b_var;		//  { dg-bogus "" }
++// { dg-final { scan-assembler-symbol-section {b_var} {^\.(const|rodata)|\[RO\]} } }
+-- 
+2.36.0.1.g2bbe56bd8d
+
diff --git a/build/unix/build-gcc/build-gcc.sh b/build/unix/build-gcc/build-gcc.sh
new file mode 100755
index 0000000000..7b56327cb6
--- /dev/null
+++ b/build/unix/build-gcc/build-gcc.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+
+set -e
+set -x
+
+make_flags="-j$(nproc)"
+
+apply_patch() {
+  if [ $# -ge 2 ]; then
+    pushd $root_dir/$1
+    shift
+  else
+    pushd $root_dir/gcc-source
+  fi
+  patch -p1 < $1
+  popd
+}
+
+build_binutils() {
+  # if binutils_configure_flags is not set at all, give it the default value
+  if [ -z "${binutils_configure_flags+xxx}" ];
+  then
+    # gold is disabled because we don't use it on automation, and also we ran into
+    # some issues with it using this script in build-clang.py.
+    #
+    # --enable-targets builds extra target support in ld.
+    # Enabling aarch64 support brings in arm support, so we don't need to specify that too.
+    #
+    # It is important to have the binutils --target and the gcc --target match,
+    # so binutils will install binaries in a place that gcc will look for them.
+    binutils_configure_flags="--enable-targets=aarch64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu --disable-gold --enable-plugins --disable-nls --with-sysroot=/"
+  fi
+
+  mkdir $root_dir/binutils-objdir
+  pushd $root_dir/binutils-objdir
+  ../binutils-source/configure --prefix=${prefix-/tools/gcc}/ $binutils_configure_flags
+  make $make_flags
+  make install $make_flags DESTDIR=$root_dir
+  export PATH=$root_dir/${prefix-/tools/gcc}/bin:$PATH
+  popd
+}
+
+build_gcc() {
+  # Be explicit about --build and --target so header and library install
+  # directories are consistent.
+  local target="${1:-x86_64-unknown-linux-gnu}"
+
+  mkdir $root_dir/gcc-objdir
+  pushd $root_dir/gcc-objdir
+
+  if [ -d $MOZ_FETCHES_DIR/sysroot ]; then
+    EXTRA_CONFIGURE_FLAGS="--with-build-sysroot=$MOZ_FETCHES_DIR/sysroot"
+    export CFLAGS_FOR_BUILD="--sysroot=$MOZ_FETCHES_DIR/sysroot"
+  fi
+  ../gcc-source/configure --prefix=${prefix-/tools/gcc} --build=x86_64-unknown-linux-gnu --target="${target}" --enable-languages=c,c++  --disable-nls --disable-gnu-unique-object --enable-__cxa_atexit --with-arch-32=pentiumpro --with-sysroot=/ $EXTRA_CONFIGURE_FLAGS
+  make $make_flags
+  make $make_flags install DESTDIR=$root_dir
+
+  cd $root_dir/tools
+  ln -s gcc gcc/bin/cc
+
+  tar caf $root_dir/gcc.tar.zst gcc/
+  popd
+}