dc-chain: adding sh_force_libbfd_installation flag.

This flag could be used if you want to force the installation of `libbfd` for the SH toolchain.
This is required for MinGW/MSYS and can't be disabled in this scenario. This option is here mainly if you want to force the installation of `libbfd` under other environments; but this won't be necessary in most cases, as `libelf` is used almost everywhere.
This flag has been tested for building static binaries of GCC 12.2.0 using MinGW-w64 environment.

utils/dc-chain/config.mk.legacy.sample

@@ -145,3 +145,12 @@ install_mode=install-strip
 # also disable the 'kos' thread model. Don't mess with that flag unless you know
 # exactly what you are doing.
 #auto_fixup_sh4_newlib=0
+
+# Force installation of BFD for SH (1|0)
+# Uncomment this if you want to force the installation of 'libbfd' for the SH
+# toolchain. This is required for MinGW/MSYS and can't be disabled in this
+# scenario. This option is here mainly if you want to force the installation of
+# 'libbfd' under other environments; but this won't be necessary in most cases,
+# as 'libelf' is used almost everywhere. Don't mess with that flag unless you
+# know exactly what you are doing.
+#sh_force_libbfd_installation=1

utils/dc-chain/config.mk.stable.sample

@@ -145,3 +145,12 @@ install_mode=install-strip
 # also disable the 'kos' thread model. Don't mess with that flag unless you know
 # exactly what you are doing.
 #auto_fixup_sh4_newlib=0
+
+# Force installation of BFD for SH (1|0)
+# Uncomment this if you want to force the installation of 'libbfd' for the SH
+# toolchain. This is required for MinGW/MSYS and can't be disabled in this
+# scenario. This option is here mainly if you want to force the installation of
+# 'libbfd' under other environments; but this won't be necessary in most cases,
+# as 'libelf' is used almost everywhere. Don't mess with that flag unless you
+# know exactly what you are doing.
+#sh_force_libbfd_installation=1

utils/dc-chain/config.mk.testing.sample

@@ -145,3 +145,12 @@ install_mode=install-strip
 # also disable the 'kos' thread model. Don't mess with that flag unless you know
 # exactly what you are doing.
 #auto_fixup_sh4_newlib=0
+
+# Force installation of BFD for SH (1|0)
+# Uncomment this if you want to force the installation of 'libbfd' for the SH
+# toolchain. This is required for MinGW/MSYS and can't be disabled in this
+# scenario. This option is here mainly if you want to force the installation of
+# 'libbfd' under other environments; but this won't be necessary in most cases,
+# as 'libelf' is used almost everywhere. Don't mess with that flag unless you
+# know exactly what you are doing.
+#sh_force_libbfd_installation=1

utils/dc-chain/scripts/binutils.mk

@@ -26,7 +26,7 @@ $(build_binutils): logdir
         $(to_log)
 	$(MAKE) $(makejobs) -C $(build) DESTDIR=$(DESTDIR) $(to_log)
 	$(MAKE) -C $(build) $(install_mode) DESTDIR=$(DESTDIR) $(to_log)
-# MinGW/MSYS
+# MinGW/MSYS or 'sh_force_libbfd_installation=1'
 # This part is about BFD for sh-elf target.
 # It will move sh-elf libbfd into a nicer place, as our cross-compiler is made 
 # by us for our usage... so no problems about system libbfd conflicts!

utils/dc-chain/scripts/build.mk

@@ -40,9 +40,15 @@ $(build_sh4_targets): extra_configure_args = --with-multilib-list=m4-single-only
 $(build_sh4_targets): gcc_ver = $(sh_gcc_ver)
 $(build_sh4_targets): binutils_ver = $(sh_binutils_ver)
 
-ifdef MINGW
+# MinGW/MSYS or 'sh_force_libbfd_installation=1': install BFD if required.
 # To compile dc-tool, we need to install libbfd for sh-elf.
 # This is done when making build-sh4-binutils.
+ifdef sh_force_libbfd_installation
+  ifneq (0,$(sh_force_libbfd_installation))
+    do_sh_force_libbfd_installation := 1
+  endif
+endif
+ifneq ($(or $(MINGW),$(do_sh_force_libbfd_installation)),)
   $(build_sh4_targets): libbfd_install_flag = -enable-install-libbfd -enable-install-libiberty
   $(build_sh4_targets): libbfd_src_bin_dir = $(sh_prefix)/$(host_triplet)/$(sh_target)
 endif