Switch from using 'nacl_main' to 'main' entry point

ports/perl/build.sh

 # Copyright (c) 2015 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # falling back to cc for generating build time artifacts
 export BUILD_CC=cc
 export BUILD_LD=cc
 # use -Wno-return-type to suppress return-type errors encountered
 # with pnacl, arm's clang-newlib (microperl)
 NACLPORTS_CFLAGS_MICRO=$NACLPORTS_CFLAGS
-NACLPORTS_CFLAGS_MICRO+=" -Dmain=nacl_main -Wno-return-type "
+NACLPORTS_CFLAGS_MICRO+=" -Wno-return-type "
 NACLPORTS_CFLAGS+=" -I${NACL_SDK_ROOT}/include -I${NACLPORTS_INCLUDE} \
   -Wno-return-type"
 BUILD_DIR=${SRC_DIR}
 # keeping microperl for now
 EXECUTABLES="perl microperl"
-NACLPORTS_LDFLAGS+=" ${NACL_CLI_MAIN_LIB}"
 # we need a working perl on host to build things for target
 HOST_BUILD=${WORK_DIR}/build_host
 ARCH_DIR=${PUBLISH_DIR}/${NACL_ARCH}
-NACLPORTS_LIBS=" ${NACL_CLI_MAIN_LIB}"
 # PNaCl and newlib dont have dynamic loading, so
 # using Perl's internal stub file dl_none.xs
 # specifically for systems which do not support it
 # Also, FILE pointer is structured a bit differently
 # Relevant stdio parameters found via sel_ldr on Linux
 if [ "${NACL_LIBC}" = "newlib" -o "${NACL_ARCH}" = "pnacl" ] ; then
   NACLPORTS_LIBS+=" -lm -ltar"
   DYNAMIC_EXT=""
   NACL_GLIBC_DEF="undef"
   PERL_STDIO_BASE="(((fp)->_bf)._base)"
@@ skipping 21 matching lines @@
   PERL_STDIO_PTR="((fp)->_IO_read_ptr)"
   PERL_DLSRC="dl_dlopen.xs"
   NACLPORTS_CCDLFLAGS="-Wl,-E"
 fi
 # include Errno in pnacl
 NONXS_EXT=""
 if [ "${NACL_ARCH}" = "pnacl" ] ; then
   NONXS_EXT="Errno"
 fi
 
+EnableCliMain
 EnableGlibcCompat
 
 # BuildHostMiniperl builds miniperl for host, which is needed for
 # building Perl for the target
 BuildHostMiniperl() {
   if [ ! -x ${HOST_BUILD}/miniperl ]; then
     MakeDir ${HOST_BUILD}
     ChangeDir ${SRC_DIR}
     LogExecute ${SRC_DIR}/Configure -des -Dprefix=${HOST_BUILD}
     LogExecute make -j${OS_JOBS} miniperl
@@ skipping 55 matching lines @@
   ./Policy_sh.SH
   ./x2p/Makefile.SH
 }
 
 BuildStep() {
   # clean up previous executables
   LogExecute make -j${OS_JOBS} -f Makefile.micro clean
   # microperl build from Makefile.micro
   LogExecute make -j${OS_JOBS} -f Makefile.micro CC="${NACLCC}" \
     CCFLAGS=" -c -DHAS_DUP2 -DPERL_MICRO ${NACLPORTS_CFLAGS_MICRO}" \
-    LDFLAGS="${NACLPORTS_LDFLAGS}"
+    LDFLAGS="${NACLPORTS_LDFLAGS}" LIBS="${NACLPORTS_LIBS}"
   # now make perl
   LogExecute cp -f microperl ${HOST_BUILD}
   LogExecute make clean
   LogExecute ${BUILD_CC} -c -DPERL_CORE -fwrapv -fno-strict-aliasing -pipe \
     -O2 -Wall generate_uudmap.c
   LogExecute ${BUILD_LD} -o generate_uudmap generate_uudmap.o -lm
   LogExecute make -j${OS_JOBS} libs="${NACLPORTS_LIBS}" all
   # test_prep prepares the perl for tests, might use this later
   LogExecute make -j${OS_JOBS} libs="${NACLPORTS_LIBS}" test_prep
   LogExecute mv -f ${HOST_BUILD}/microperl ${SRC_DIR}
@@ skipping 27 matching lines @@
   EXPECTED=${START_DIR}/expected_${TOOLCHAIN}.txt
   if ! cmp tests_out.txt ${EXPECTED}; then
     echo "Test output did not match expected output"
     echo "See ${PWD}/tests_err.txt"
     diff -u tests_out.txt ${EXPECTED}
     exit 1
   fi
 
   echo "PASSED"
 }