cc/gcc: add option for linker hash style

Add an option to specify the hash type that gcc will ask the linker to use.
It is a provision for the upcoming 4.7, as no version currently supports it.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

config/cc/gcc.in

@@ -277,6 +277,11 @@ config CC_GCC_HAS_PKGVERSION_BUGURL
 config CC_GCC_HAS_BUILD_ID
     bool
 
+# For the upcoming 4.7 ?
+# None have linker-hash-style support for now...
+config CC_GCC_HAS_LNK_HASH_STYLE
+    bool
+
 # Only enable gcc's support for plugins if binutils has it as well
 # They are usefull only when doing LTO, but it does no harm enabling
 # them even without LTO.

config/cc/gcc.in.2

@@ -211,3 +211,41 @@ config CC_GCC_BUILD_ID
       option is ignored.
       
       The default is off.
+
+choice CC_GCC_LNK_HASH_STYLE_CHOICE
+    bool
+    prompt "linker hash style"
+    depends on CC_GCC_HAS_LNK_HASH_STYLE
+
+config CC_GCC_LNK_HASH_STYLE_DEFAULT
+    bool
+    prompt "Default"
+    help
+      Do not specify any value, and use the default value (sysv).
+
+config CC_GCC_LNK_HASH_STYLE_SYSV
+    bool
+    prompt "sysv"
+    help
+      Force use of the SYSV hash style.
+
+config CC_GCC_LNK_HASH_STYLE_GNU
+    bool
+    prompt "gnu"
+    help
+      Force use of the GNU hash style.
+
+config CC_GCC_LNK_HASH_STYLE_BOTH
+    bool
+    prompt "both"
+    help
+      Force use of both hash styles.
+
+endchoice # CC_GCC_LNK_HASH_STYLE_CHOICE
+
+config CC_GCC_LNK_HASH_STYLE
+    string
+    default ""      if CC_GCC_LNK_HASH_STYLE_DEFAULT
+    default "sysv"  if CC_GCC_LNK_HASH_STYLE_SYSV
+    default "gnu"   if CC_GCC_LNK_HASH_STYLE_GNU
+    default "both"  if CC_GCC_LNK_HASH_STYLE_BOTH

scripts/build/cc/gcc.sh

@@ -262,6 +262,11 @@ do_cc_core() {
         extra_config+=( --enable-linker-build-id )
     fi
 
+    case "${CT_CC_GCC_LNK_HASH_STYLE}" in
+        "") ;;
+        *)  extra_config+=( "--with-linker-hash-style=${CT_CC_GCC_LNK_HASH_STYLE}" );;
+    esac
+
     CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"
 
     # Use --with-local-prefix so older gccs don't look in /usr/local (http://gcc.gnu.org/PR10532)
@@ -534,6 +539,11 @@ do_cc() {
         extra_config+=( --enable-linker-build-id )
     fi
 
+    case "${CT_CC_GCC_LNK_HASH_STYLE}" in
+        "") ;;
+        *)  extra_config+=( "--with-linker-hash-style=${CT_CC_GCC_LNK_HASH_STYLE}" );;
+    esac
+
     if [ "${CT_CC_GCC_ENABLE_PLUGINS}" = "y" ]; then
         extra_config+=( --enable-plugin )
     fi