Restore LTO support

Dockerfile

@@ -250,7 +250,7 @@ RUN cat $PREFIX/src/gcc-*.patch | patch -d/dl/gcc -p1 \
         --disable-libstdcxx-verbose \
         --disable-dependency-tracking \
         --disable-nls \
-        --disable-lto \
+        --enable-lto \
         --disable-multilib \
         CFLAGS_FOR_TARGET="-O2" \
         CXXFLAGS_FOR_TARGET="-O2" \
@@ -359,6 +359,12 @@ RUN /dl/mpc/configure \
  && make -j$(nproc) \
  && make install
 
+COPY --from=dl-zstd /dl/zstd/ /dl/zstd/
+WORKDIR /dl/zstd/lib
+RUN make -j$(nproc) CC=$ARCH-gcc AR=$ARCH-ar CFLAGS="-O2" libzstd.a \
+ && cp libzstd.a /deps/lib/ \
+ && cp zstd.h zstd_errors.h zdict.h /deps/include/
+
 WORKDIR /mingw-headers
 RUN /dl/mingw/mingw-w64-headers/configure \
         --prefix=$PREFIX \
@@ -411,13 +417,14 @@ RUN echo 'BEGIN {print "pecoff"}' \
         --with-gmp=/deps \
         --with-mpc=/deps \
         --with-mpfr=/deps \
+        --with-zstd=/deps \
         --enable-languages=c,c++,fortran \
         --enable-libgomp \
         --enable-threads=posix \
         --enable-version-specific-runtime-libs \
         --disable-libstdcxx-verbose \
         --disable-dependency-tracking \
-        --disable-lto \
+        --enable-lto \
         --disable-multilib \
         --disable-nls \
         --disable-win32-registry \
@@ -645,13 +652,6 @@ RUN cat $PREFIX/src/ctags-*.patch | patch -p1 \
  && cp ctags.exe /out/bin/
 
 FROM cross AS build-zstd
-COPY --from=dl-zstd /dl/ /dl/
-
-WORKDIR /dl/zstd/lib
-RUN make -j$(nproc) CC=$ARCH-gcc AR=$ARCH-ar CFLAGS="-O2" libzstd.a \
- && cp libzstd.a /deps/lib/ \
- && cp zstd.h zstd_errors.h zdict.h /deps/include/
-
 WORKDIR /dl/zstd
 RUN make -j$(nproc) -C programs zstd \
         CC=$ARCH-gcc CFLAGS="-O2" LDFLAGS="-s" EXT=.exe \

src/binutils-pei386-runtime-reloacator-undefinedreference.patch

@@ -0,0 +1,66 @@
+--- a/ld/emultempl/pe.em
++++ b/ld/emultempl/pe.em
+@@ -1248,6 +1248,18 @@ make_runtime_ref (void)
+     }
+ }
+
++static bool
++have_plugin_claimed_input (void)
++{
++  lang_input_statement_type *f;
++
++  for (f = (void *) file_chain.head; f != NULL; f = f->next)
++    if (f->flags.claimed)
++      return true;
++
++  return false;
++}
++
+ static bool
+ pr_sym (struct bfd_hash_entry *h, void *inf ATTRIBUTE_UNUSED)
+ {
+@@ -1457,7 +1469,9 @@ gld${EMULATION_NAME}_before_plugin_all_symbols_read (void)
+ {
+ #ifdef DLL_SUPPORT
+   if (link_info.lto_plugin_active
+-      && link_info.pei386_auto_import)
++      && link_info.pei386_auto_import
++      && link_info.pei386_runtime_pseudo_reloc != 0
++      && have_plugin_claimed_input ())
+     make_runtime_ref ();
+ #endif
+ }
+diff --git a/ld/emultempl/pep.em b/ld/emultempl/pep.em
+index 280949b6e51..a72caf97de9 100644
+--- a/ld/emultempl/pep.em
++++ b/ld/emultempl/pep.em
+@@ -1254,6 +1254,18 @@ make_runtime_ref (void)
+     }
+ }
+
++static bool
++have_plugin_claimed_input (void)
++{
++  lang_input_statement_type *f;
++
++  for (f = (void *) file_chain.head; f != NULL; f = f->next)
++    if (f->flags.claimed)
++      return true;
++
++  return false;
++}
++
+ static bool
+ pr_sym (struct bfd_hash_entry *h, void *inf ATTRIBUTE_UNUSED)
+ {
+@@ -1464,7 +1476,9 @@ gld${EMULATION_NAME}_before_plugin_all_symbols_read (void)
+ {
+ #ifdef DLL_SUPPORT
+   if (link_info.lto_plugin_active
+-      && link_info.pei386_auto_import) /* -1=warn or 1=enable */
++      && link_info.pei386_auto_import /* -1=warn or 1=enable */
++      && link_info.pei386_runtime_pseudo_reloc != 0
++      && have_plugin_claimed_input ())
+     make_runtime_ref ();
+ #endif
+ }