Switch to using the LLVM gold plugin as a fully linked-in object rather than DSO.

pnacl/build.sh

Index: pnacl/build.sh
===================================================================
--- pnacl/build.sh	(revision 7831)
+++ pnacl/build.sh	(working copy)
@@ -176,6 +176,9 @@
 readonly SYSROOT_DIR="${INSTALL_NEWLIB}/sysroot"
 readonly FAKE_INSTALL_DIR="${INSTALL_PKG}/fake"
 
+readonly LLVM_GOLD_PLUGIN_DIR="${LLVM_INSTALL_DIR}"/plugin
+readonly LLVM_GOLD_PLUGIN="${LLVM_GOLD_PLUGIN_DIR}"/gold-plugin-static.o
+
 # TODO(pdox): Consider getting rid of pnacl-ld libmode bias,
 #             and merging these two.
 readonly PNACL_LD_NEWLIB="${INSTALL_NEWLIB_BIN}/pnacl-ld"
@@ -254,10 +257,10 @@
 fi
 
 # Current milestones in each repo
-readonly UPSTREAM_REV=${UPSTREAM_REV:-1de82863028c}
+readonly UPSTREAM_REV=${UPSTREAM_REV:-1de82863028c} # TO BE UPDATED
 
 readonly NEWLIB_REV=346ea38d142f
-readonly BINUTILS_REV=ae568f8eb6e0
+readonly BINUTILS_REV=ae568f8eb6e0 # TO BE UPDATED
 readonly COMPILER_RT_REV=1a3a6ffb31ea
 
 readonly LLVM_PROJECT_REV=${LLVM_PROJECT_REV:-147864}
@@ -278,6 +281,7 @@
 
 CC=${CC:-gcc}
 CXX=${CXX:-g++}
+AR=${AR:-ar}
 if ${HOST_ARCH_X8632} ; then
   # These are simple compiler wrappers to force 32bit builds
   # For bots and releases we build the toolchains
@@ -803,8 +807,8 @@
 
   clean-logs
 
+  llvm
   binutils
-  llvm
   driver
 
   libs
@@ -1240,42 +1244,32 @@
        make ${MAKE_OPTS} install
   spopd
 
-  llvm-install-links
+  llvm-install-plugin
 }
 
-llvm-install-links() {
-  local makelink="ln -sf"
+# Produces gold-plugin-static.o, which is the gold plugin
+# with all LLVM dependencies statically linked in.
+llvm-install-plugin() {
+  StepBanner "LLVM" "Installing plugin"
+  mkdir -p "${LLVM_GOLD_PLUGIN_DIR}"
 
-  # On Windows, these can't be symlinks.
-  if ${BUILD_PLATFORM_WIN}; then
-    makelink="cp -a"
-  fi
+  # This pulls every LLVM dependency needed for gold-plugin.o and libLTO.
+  local components="x86 arm linker analysis ipo bitwriter"
 
-  mkdir -p "${BFD_PLUGIN_DIR}"
+  ${CC} -r -nostdlib \
+         "${TC_BUILD_LLVM}"/tools/gold/Release+Asserts/gold-plugin.o \
+        -L "${TC_BUILD_LLVM}"/Release+Asserts/lib \
+        -Wl,-Bstatic \
+        -lLTO \
+        $("${LLVM_INSTALL_DIR}"/bin/llvm-config --libs ${components}) \
+        -o "${LLVM_GOLD_PLUGIN}"
 
-  # TODO(pdox): These may no longer be necessary.
-  if [ -f "${BFD_PLUGIN_DIR}/../../../llvm/${SO_DIR}/LLVMgold${SO_EXT}" ]; then
-    # this is to make sure whatever name LLVMgold.so is, it is always
-    # libLLVMgold.so as far as PNaCl is concerned
-
-    StepBanner "Symlinking LLVMgold.so to libLLVMgold.so in " \
-     "${BFD_PLUGIN_DIR}/../../../llvm/${SO_DIR}"
-
-    (cd "${BFD_PLUGIN_DIR}/../../../llvm/${SO_DIR}";
-      ${makelink} "LLVMgold${SO_EXT}" "${SO_PREFIX}LLVMgold${SO_EXT}";
-    )
-  fi
-
-  spushd "${BFD_PLUGIN_DIR}"
-
-  ${makelink} ../../../llvm/${SO_DIR}/${SO_PREFIX}LLVMgold${SO_EXT} .
-  ${makelink} ../../../llvm/${SO_DIR}/${SO_PREFIX}LTO${SO_EXT} .
-  spopd
-
-  spushd "${BINUTILS_INSTALL_DIR}/${SO_DIR}"
-  ${makelink} ../../llvm/${SO_DIR}/${SO_PREFIX}LTO${SO_EXT} .
-  ${makelink} ../../llvm/${SO_DIR}/${SO_PREFIX}LLVMgold${SO_EXT} .
-  spopd
+  # Force re-link of ld, gold, ar, ranlib, nm
+  rm -f "${TC_BUILD_BINUTILS}"/binutils/ar
+  rm -f "${TC_BUILD_BINUTILS}"/binutils/nm-new
+  rm -f "${TC_BUILD_BINUTILS}"/binutils/ranlib
+  rm -f "${TC_BUILD_BINUTILS}"/gold/ld-new
+  rm -f "${TC_BUILD_BINUTILS}"/ld/ld-new
 }
 
 #########################################################################
@@ -1962,12 +1956,8 @@
     SkipBanner "BINUTILS" "configure"
   fi
 
-  if binutils-needs-make; then
-    binutils-make
-  else
-    SkipBanner "BINUTILS" "make"
-  fi
-
+  binutils-dlwrap
+  binutils-make
   binutils-install
 }
 
@@ -1978,6 +1968,23 @@
   rm -rf ${objdir}
 }
 
+binutils-dlwrap() {
+  local srcdir="${TC_SRC_BINUTILS}"
+  local objdir="${TC_BUILD_BINUTILS}"
+
+  if ! [ -f "${LLVM_GOLD_PLUGIN}" ]; then
+    Fatal "LLVM must be installed before building binutils."
+  fi
+
+  # Build libdlwrap.a
+  mkdir -p "${objdir}/dlwrap"
+  spushd "${objdir}/dlwrap"
+  ${CC} -c "${srcdir}"/dlwrap/dlwrap.c -o dlwrap.o
+  cp "${LLVM_GOLD_PLUGIN}" gold_plugin_static.o
+  ${AR} crs libdlwrap.a dlwrap.o gold_plugin_static.o
+  spopd
+}
+
 #+ binutils-configure- Configure binutils for ARM
 binutils-configure() {
   StepBanner "BINUTILS" "Configure"
@@ -1996,12 +2003,16 @@
   # TODO(pdox): Building binutils for nacl/nacl64 target currently requires
   # providing NACL_ALIGN_* defines. This should really be defined inside
   # binutils instead.
+  local flags="-DNACL_ALIGN_BYTES=32 -DNACL_ALIGN_POW2=5 \
+               -I${TC_SRC_BINUTILS}/dlwrap -DENABLE_DLWRAP"
   RunWithLog binutils.configure \
     env -i \
     PATH="/usr/bin:/bin" \
     CC="${CC}" \
     CXX="${CXX}" \
-    CFLAGS="-DNACL_ALIGN_BYTES=32 -DNACL_ALIGN_POW2=5" \
+    LDFLAGS="-L${objdir}/dlwrap" \
+    CFLAGS="${flags}" \
+    CXXFLAGS="${flags}" \
     ${srcdir}/binutils-2.20/configure --prefix="${BINUTILS_INSTALL_DIR}" \
                                       --target=${BINUTILS_TARGET} \
                                       --enable-targets=${targ} \
@@ -2024,16 +2035,6 @@
   return $?
 }
 
-binutils-needs-make() {
-  local srcdir="${TC_SRC_BINUTILS}"
-  local objdir="${TC_BUILD_BINUTILS}"
-  local ret=1
-  binutils-mess-hide
-  ts-modified "$srcdir" "$objdir" && ret=0
-  binutils-mess-unhide
-  return ${ret}
-}
-
 #+ binutils-make     - Make binutils for ARM
 binutils-make() {
   StepBanner "BINUTILS" "Make"
@@ -2605,6 +2606,7 @@
         --enable-targets=${BINUTILS_SB_ELF_TARGETS} \
         --disable-nls \
         --disable-werror \
+        --disable-plugins \
         --enable-static \
         --enable-shared=no
   spopd