build: Experimental LTO support, phase one

 * Only codecs and plugins are enabled
 * Only native builds (so far)
 * Only tested on xDuoo X3 (MIPS, monochrome)
 * opus & speex generate some warnings
 * Significant compile time impact

Change-Id: I519b0d179631a54b2103cd67225bd5ec6ad3bd2f

1 files changed, 7 insertions, 1 deletions

diff --git a/tools/configure b/tools/configure
index c58ce164ac..bf96bf0058 100755
--- a/tools/configure
+++ b/tools/configure
@@ -945,13 +945,14 @@ whichadvanced () {
     echo ""
     printf "Enter your developer options (press only enter when done)\n\
 (D)EBUG, (L)ogf, Boot(c)hart, (S)imulator, (P)rofiling, (V)oice, (U)SB Serial, (W)in32 crosscompile,\n\
-Win(6)4 crosscompile, (T)est plugins, (O)mit plugins, S(m)all C lib, Logf to Ser(i)al port:"
+Win(6)4 crosscompile, (T)est plugins, (O)mit plugins, S(m)all C lib, Logf to Ser(i)al port, LTO (B)uild "
     if [ "$modelname" = "iaudiom5" ]; then
       printf ", (F)M radio MOD"
     fi
     if [ "$modelname" = "iriverh120" ]; then
       printf ", (R)TC MOD"
     fi
+    printf ":"
     echo ""
   fi
 
@@ -1043,6 +1044,10 @@ Win(6)4 crosscompile, (T)est plugins, (O)mit plugins, S(m)all C lib, Logf to Ser
         win32crosscompile="yes"
         win64="yes"
         ;;
+       [Bb])
+        echo "LTO build enabled"
+        LTO_ARG="export USE_LTO=y"
+        ;;
       "") # Match enter press when finished with advanced options
         cont=0
         ;;
@@ -4806,6 +4811,7 @@ export ANDROID_PLATFORM_VERSION=${ANDROID_PLATFORM_VERSION}
 export TOOLSET=${toolset}
 export PIPER_MODEL_DIR=${PIPER_MODEL_DIR}
 $CCACHE_ARG
+$LTO_ARG
 
 CONFIGURE_OPTIONS=${cmdline}