Merge pull request #1589 from cpackham/zstd

cc/gcc: Add options for zstd usage

config/cc/gcc.in

@@ -179,6 +179,25 @@ config CC_GCC_USE_LTO
     help
       Enable the Link Time Optimisations.
 
+config CC_GCC_LTO_ZSTD
+    tristate
+    prompt "Support LTO compression with zstd"
+    default m
+    depends on CC_GCC_USE_LTO
+    depends on GCC_10_or_later
+    depends on ! STATIC_TOOLCHAIN
+    help
+      Support zstd compression for LTO object files. This will require
+      libzstd to be installed when using the toolchain
+
+       Option  | ZSTD use           | Associated ./configure switch
+      ---------+--------------------+--------------------------------
+         Y     | forcibly used      | --with-zstd
+         M     | auto               | (none, ./configure decides)
+         N     | forcibly not used  | --without-zstd
+
+      If unsure, say 'M'
+
 #-----------------------------------------------------------------------------
 comment "Settings for libraries running on target"
 

scripts/build/cc/gcc.sh

@@ -1130,6 +1130,11 @@ do_gcc_backend() {
     else
         extra_config+=("--disable-lto")
     fi
+    case "${CT_CC_GCC_LTO_ZSTD}" in
+        y) extra_config+=("--with-zstd");;
+        m) ;;
+        *) extra_config+=("--without-zstd");;
+    esac
 
     if [ ${#host_libstdcxx_flags[@]} -ne 0 ]; then
         extra_config+=("--with-host-libstdcxx=${host_libstdcxx_flags[*]}")