[PATCH 07 of 10] cc/gcc: build lto-plugin if binutils' gold is built

["Yann E. MORIN" <yann dot morin dot 1998 at anciens dot enib dot fr>]

# HG changeset patch
# User "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
# Date 1293641915 -3600
# Node ID 399843f2fc886c6015bec5e0d3efcba0e555fb6a
# Parent  f55ffa24e6be5a7f23f7794d9fbfcb77d8d07570
cc/gcc: build lto-plugin if binutils' gold is built

To properly enable LTO with gold, gcc has to install a plugin that gold
uses to handle the LTO information.

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

diff --git a/scripts/build/cc/gcc.sh b/scripts/build/cc/gcc.sh
--- a/scripts/build/cc/gcc.sh
+++ b/scripts/build/cc/gcc.sh
@@ -481,6 +481,16 @@
         "") extra_config+=("--without-long-double-128");;
     esac
 
+    # If LTO is selected and binutils has gold, then enable
+    # building the lto plugin with the --enable-gold option,
+    # but only if gold has support for plugins.
+    if [    "${CT_BINUTILS_GOLD_INSTALLED}" = "y"   \
+         -a "${CT_BINUTILS_GOLD_PLUGINS}" = "y"     \
+         -a "${CT_CC_GCC_USE_LTO}" = "y"            \
+       ]; then
+        extra_config+=( --enable-gold )
+    fi
+
     CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"
 
     # --enable-symvers=gnu really only needed for sh4 to work around a

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