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[PATCH] Add --enable-host-shared configuration option


My JIT branch requires embedding GCC's code as a shared library on the
host.  To do requires building the host code as position-independent,
which unfortunately incurs a small speed hit.

Hence we need a configuration option, so that you can opt-in to
position-independent host code.

This patch adds an "--enable-host-shared" option throughout the various
configure/Make machinery for host code, adding "-fPIC" where appropriate
when enabled.

It is equivalent to the changes I currently have on my "dmalcolm/jit"
branch in git.

My first time attempt at this handled --enable-host-shared by detecting
it in each child "configure" script (as generated from configure.ac) and
conditionally appending -fPIC to makefile variables such as CFLAGS,
CXXFLAGS and LDFLAGS.

This worked when invoking "make" from each subdirectory, but not when
running "make" in the top-level directory: the top-level make would
pass in "CFLAGS=-g -O2" to the child makes, overriding their CFLAGS,
thus erroneously omitting the "-fPIC" flag.

This patch instead adds a PICFLAG variable, set up in the child
configure scripts, to contain -fPIC if configured with
--enable-host-shared.  The PICFLAG variable is then added to an
appropriate variable in each child makefile to ensure that it is used
when building host code.

This ensures that -fPIC is present if requested, when building both
from the top-level directory, and from the child directories.

There's precedent for both "PICFLAG" and "PIC_FLAG" in the source tree:
libiberty uses "PICFLAG", libbacktrace usss "PIC_FLAG".  I went with
"PICFLAG" for the new flags.

The patch uses -fPIC rather than -fpic.

Successfully bootstrapped and regtesting on x86_64-unknown-linux.

OK for trunk?

ChangeLog follows inline:

/
	* configure.ac: Add --enable-host-shared
	* configure: Regenerate.

gcc/
	* Makefile.in (PICFLAG): New.
	(enable_host_shared): New.
	(INTERNAL_CFLAGS): Use PICFLAG.
	(LIBIBERTY): Use pic build of libiberty.a if configured with
	--enable-host-shared.
	* configure.ac: Add --enable-host-shared, setting up new
	PICFLAG variable.
	* configure: Regenerate.

libbacktrace/
	* configure.ac: Add --enable-host-shared, setting up
	pre-existing PIC_FLAG variable within Makefile.am et al.
	* configure: Regenerate.

libcpp/
	* Makefile.in (PICFLAG): New.
	(ALL_CFLAGS): Add PICFLAG.
	(ALL_CXXFLAGS): Likewise.
	* configure.ac: Add --enable-host-shared, setting up new
	PICFLAG variable.
	* configure: Regenerate.

libdecnumber/
	* Makefile.in (PICFLAG): New.
	(ALL_CFLAGS): Add PICFLAG.
	* configure.ac: Add --enable-host-shared, setting up new
	PICFLAG variable.
	* configure: Regenerate.

libiberty/
	* configure.ac: If --enable-host-shared, use -fPIC.
	* configure: Regenerate.

zlib/
	* configure.ac: Add --enable-host-shared, setting up new
	PICFLAG variable.
	* Makefile.am: Add PICFLAG to libz_a_CFLAGS.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
---
 configure                 | 13 +++++++++++++
 configure.ac              |  7 +++++++
 gcc/Makefile.in           | 14 +++++++++++++-
 gcc/configure             | 20 ++++++++++++++++++--
 gcc/configure.ac          |  9 +++++++++
 libbacktrace/configure    | 12 ++++++++++--
 libbacktrace/configure.ac |  5 +++++
 libcpp/Makefile.in        |  5 +++--
 libcpp/configure          | 13 +++++++++++++
 libcpp/configure.ac       |  7 +++++++
 libdecnumber/Makefile.in  |  3 ++-
 libdecnumber/configure    | 13 +++++++++++++
 libdecnumber/configure.ac |  7 +++++++
 libiberty/configure       |  6 ++++++
 libiberty/configure.ac    |  6 ++++++
 zlib/Makefile.am          |  2 +-
 zlib/Makefile.in          |  3 ++-
 zlib/configure            | 16 ++++++++++++++--
 zlib/configure.ac         |  6 ++++++
 19 files changed, 155 insertions(+), 12 deletions(-)

diff --git a/configure b/configure
index 6ad3c49..d62285c 100755
--- a/configure
+++ b/configure
@@ -556,6 +556,7 @@ enable_option_checking=no
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
 compare_exclusions
+host_shared
 stage2_werror_flag
 stage1_checking
 stage1_cflags
@@ -787,6 +788,7 @@ with_build_time_tools
 enable_maintainer_mode
 enable_stage1_checking
 enable_werror
+enable_host_shared
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1490,6 +1492,7 @@ Optional Features:
                           choose additional checking for stage1 of the
                           compiler
   --enable-werror         enable -Werror in bootstrap stage2 and later
+  --enable-host-shared    build host code as shared libraries
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -14570,6 +14573,16 @@ case ${enable_werror} in
 esac
 
 
+# Enable --enable-host-shared.
+# Check whether --enable-host-shared was given.
+if test "${enable_host_shared+set}" = set; then :
+  enableval=$enable_host_shared; host_shared=$enableval
+else
+  host_shared=no
+fi
+
+
+
 # Specify what files to not compare during bootstrap.
 
 compare_exclusions="gcc/cc*-checksum\$(objext) | gcc/ada/*tools/*"
diff --git a/configure.ac b/configure.ac
index b5caebb..4c23652 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3301,6 +3301,13 @@ case ${enable_werror} in
 esac
 AC_SUBST(stage2_werror_flag)
 
+# Enable --enable-host-shared.
+AC_ARG_ENABLE(host-shared,
+[AS_HELP_STRING([--enable-host-shared],
+		[build host code as shared libraries])],
+[host_shared=$enableval], [host_shared=no])
+AC_SUBST(host_shared)
+
 # Specify what files to not compare during bootstrap.
 
 compare_exclusions="gcc/cc*-checksum\$(objext) | gcc/ada/*tools/*"
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 4e396aa..ee19ca2 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -135,6 +135,9 @@ CFLAGS = @CFLAGS@
 CXXFLAGS = @CXXFLAGS@
 LDFLAGS = @LDFLAGS@
 
+# Should we build position-independent host code?
+PICFLAG = @PICFLAG@
+
 # Flags to determine code coverage. When coverage is disabled, this will
 # contain the optimization flags, as you normally want code coverage
 # without optimization.
@@ -346,6 +349,8 @@ PLUGINLIBS = @pluginlibs@
 
 enable_plugin = @enable_plugin@
 
+enable_host_shared = @enable_host_shared@
+
 CPPLIB = ../libcpp/libcpp.a
 CPPINC = -I$(srcdir)/../libcpp/include
 
@@ -955,7 +960,7 @@ CONTEXT_H = context.h
 # programs built during a bootstrap.
 # autoconf inserts -DCROSS_DIRECTORY_STRUCTURE if we are building a
 # cross compiler which does not use the native headers and libraries.
-INTERNAL_CFLAGS = -DIN_GCC @CROSS@
+INTERNAL_CFLAGS = -DIN_GCC $(PICFLAG) @CROSS@
 
 # This is the variable actually used when we compile. If you change this,
 # you probably want to update BUILD_CFLAGS in configure.ac
@@ -978,8 +983,15 @@ ALL_COMPILERFLAGS = $(ALL_CXXFLAGS)
 ALL_LINKERFLAGS = $(ALL_CXXFLAGS)
 
 # Build and host support libraries.
+
+# Use the "pic" build of libiberty if --enable-host-shared.
+ifeq ($(enable_host_shared),yes)
+LIBIBERTY = ../libiberty/pic/libiberty.a
+BUILD_LIBIBERTY = $(build_libobjdir)/libiberty/pic/libiberty.a
+else
 LIBIBERTY = ../libiberty/libiberty.a
 BUILD_LIBIBERTY = $(build_libobjdir)/libiberty/libiberty.a
+endif
 
 # Dependencies on the intl and portability libraries.
 LIBDEPS= libcommon.a $(CPPLIB) $(LIBIBERTY) $(LIBINTL_DEP) $(LIBICONV_DEP) \
diff --git a/gcc/configure b/gcc/configure
index 2ac0347..40043bb 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -600,6 +600,8 @@ ac_includes_default="\
 
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
+PICFLAG
+enable_host_shared
 enable_plugin
 pluginlibs
 CLOOGINC
@@ -921,6 +923,7 @@ enable_maintainer_mode
 enable_link_mutex
 enable_version_specific_runtime_libs
 enable_plugin
+enable_host_shared
 enable_libquadmath_support
 with_linker_hash_style
 '
@@ -1636,6 +1639,7 @@ Optional Features:
                           specify that runtime libraries should be installed
                           in a compiler-specific directory
   --enable-plugin         enable plugin support
+  --enable-host-shared    build host code as shared libraries
   --disable-libquadmath-support
                           disable libquadmath support for Fortran
 
@@ -17893,7 +17897,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 17896 "configure"
+#line 17900 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -17999,7 +18003,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 18002 "configure"
+#line 18006 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -27694,6 +27698,18 @@ $as_echo "#define ENABLE_PLUGIN 1" >>confdefs.h
 fi
 
 
+# Enable --enable-host-shared
+# Check whether --enable-host-shared was given.
+if test "${enable_host_shared+set}" = set; then :
+  enableval=$enable_host_shared; PICFLAG=-fPIC
+else
+  PICFLAG=
+fi
+
+
+
+
+
 # Check whether --enable-libquadmath-support was given.
 if test "${enable_libquadmath_support+set}" = set; then :
   enableval=$enable_libquadmath_support; ENABLE_LIBQUADMATH_SUPPORT=$enableval
diff --git a/gcc/configure.ac b/gcc/configure.ac
index f216962..5111109 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -5399,6 +5399,15 @@ if test x"$enable_plugin" = x"yes"; then
 fi
 
 
+# Enable --enable-host-shared
+AC_ARG_ENABLE(host-shared,
+[AS_HELP_STRING([--enable-host-shared],
+		[build host code as shared libraries])],
+[PICFLAG=-fPIC], [PICFLAG=])
+AC_SUBST(enable_host_shared)
+AC_SUBST(PICFLAG)
+
+
 AC_ARG_ENABLE(libquadmath-support,
 [AS_HELP_STRING([--disable-libquadmath-support],
   [disable libquadmath support for Fortran])],
diff --git a/libbacktrace/configure b/libbacktrace/configure
index e8ef1ff..e6b13c0 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -731,6 +731,7 @@ with_gnu_ld
 enable_libtool_lock
 enable_multilib
 with_system_libunwind
+enable_host_shared
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1369,6 +1370,7 @@ Optional Features:
                           optimize for fast installation [default=yes]
   --disable-libtool-lock  avoid locking (might break parallel builds)
   --enable-multilib       build many library versions (default)
+  --enable-host-shared    build host code as shared libraries
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -11087,7 +11089,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11090 "configure"
+#line 11092 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11193,7 +11195,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11196 "configure"
+#line 11198 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11696,6 +11698,12 @@ PIC_FLAG=
 if test -n "${with_target_subdir}"; then
   PIC_FLAG=-fPIC
 fi
+# Similarly, use -fPIC with --enable-host-shared:
+# Check whether --enable-host-shared was given.
+if test "${enable_host_shared+set}" = set; then :
+  enableval=$enable_host_shared; PIC_FLAG=-fPIC
+fi
+
 
 
 # Test for __sync support.
diff --git a/libbacktrace/configure.ac b/libbacktrace/configure.ac
index 28b2a1c..48c8620 100644
--- a/libbacktrace/configure.ac
+++ b/libbacktrace/configure.ac
@@ -165,6 +165,11 @@ PIC_FLAG=
 if test -n "${with_target_subdir}"; then
   PIC_FLAG=-fPIC
 fi
+# Similarly, use -fPIC with --enable-host-shared:
+AC_ARG_ENABLE(host-shared,
+[AS_HELP_STRING([--enable-host-shared],
+		[build host code as shared libraries])],
+[PIC_FLAG=-fPIC], [])
 AC_SUBST(PIC_FLAG)
 
 # Test for __sync support.
diff --git a/libcpp/Makefile.in b/libcpp/Makefile.in
index 2353c9c..30bf896 100644
--- a/libcpp/Makefile.in
+++ b/libcpp/Makefile.in
@@ -57,6 +57,7 @@ CCDEPMODE = @CCDEPMODE@
 CXXDEPMODE = @CXXDEPMODE@
 DEPDIR = @DEPDIR@
 NOEXCEPTION_FLAGS = @noexception_flags@
+PICFLAG = @PICFLAG@
 
 datarootdir = @datarootdir@
 datadir = @datadir@
@@ -72,9 +73,9 @@ depcomp = $(SHELL) $(srcdir)/../depcomp
 INCLUDES = -I$(srcdir) -I. -I$(srcdir)/../include @INCINTL@ \
 	-I$(srcdir)/include
 
-ALL_CFLAGS = $(CFLAGS) $(WARN_CFLAGS) $(INCLUDES) $(CPPFLAGS)
+ALL_CFLAGS = $(CFLAGS) $(WARN_CFLAGS) $(INCLUDES) $(CPPFLAGS) $(PICFLAG)
 ALL_CXXFLAGS = $(CXXFLAGS) $(WARN_CXXFLAGS) $(NOEXCEPTION_FLAGS) $(INCLUDES) \
-	$(CPPFLAGS)
+	$(CPPFLAGS) $(PICFLAG)
 
 # The name of the compiler to use.
 COMPILER = $(CXX)
diff --git a/libcpp/configure b/libcpp/configure
index 60ce2e5..782a710 100755
--- a/libcpp/configure
+++ b/libcpp/configure
@@ -592,6 +592,7 @@ ac_includes_default="\
 #endif"
 
 ac_subst_vars='LTLIBOBJS
+PICFLAG
 MAINT
 USED_CATALOGS
 PACKAGE
@@ -701,6 +702,7 @@ with_libiconv_prefix
 enable_maintainer_mode
 enable_checking
 enable_canonical_system_headers
+enable_host_shared
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1340,6 +1342,7 @@ Optional Features:
                           other strings
   --enable-canonical-system-headers
                           enable or disable system headers canonicalization
+  --enable-host-shared    build host code as shared libraries
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -7204,6 +7207,16 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 esac
 
+# Enable --enable-host-shared.
+# Check whether --enable-host-shared was given.
+if test "${enable_host_shared+set}" = set; then :
+  enableval=$enable_host_shared; PICFLAG=-fPIC
+else
+  PICFLAG=
+fi
+
+
+
 # Output.
 
 ac_config_headers="$ac_config_headers config.h:config.in"
diff --git a/libcpp/configure.ac b/libcpp/configure.ac
index 799301f..a70603c 100644
--- a/libcpp/configure.ac
+++ b/libcpp/configure.ac
@@ -220,6 +220,13 @@ case $target in
 		 [Define to 1 if you can assemble SSE4 insns.])])
 esac
 
+# Enable --enable-host-shared.
+AC_ARG_ENABLE(host-shared,
+[AS_HELP_STRING([--enable-host-shared],
+		[build host code as shared libraries])],
+[PICFLAG=-fPIC], [PICFLAG=])
+AC_SUBST(PICFLAG)
+
 # Output.
 
 AC_CONFIG_HEADERS(config.h:config.in, [echo timestamp > stamp-h1])
diff --git a/libdecnumber/Makefile.in b/libdecnumber/Makefile.in
index e67ff27..b6f3842 100644
--- a/libdecnumber/Makefile.in
+++ b/libdecnumber/Makefile.in
@@ -40,6 +40,7 @@ INSTALL_PROGRAM = @INSTALL_PROGRAM@
 LDFLAGS = @LDFLAGS@
 LIBICONV = @LIBICONV@
 PACKAGE = @PACKAGE@
+PICFLAG = @PICFLAG@
 RANLIB = @RANLIB@
 SHELL = @SHELL@
 objext = @OBJEXT@
@@ -57,7 +58,7 @@ enable_decimal_float= @enable_decimal_float@
 
 INCLUDES = -I$(srcdir) -I.
 
-ALL_CFLAGS = $(CFLAGS) $(WARN_CFLAGS) $(INCLUDES) $(CPPFLAGS)
+ALL_CFLAGS = $(CFLAGS) $(WARN_CFLAGS) $(INCLUDES) $(CPPFLAGS) $(PICFLAG)
 
 bid_OBJS = bid2dpd_dpd2bid.$(objext) host-ieee32.$(objext) \
 	host-ieee64.$(objext) host-ieee128.$(objext)
diff --git a/libdecnumber/configure b/libdecnumber/configure
index 4a1896e..2720f46 100755
--- a/libdecnumber/configure
+++ b/libdecnumber/configure
@@ -593,6 +593,7 @@ ac_includes_default="\
 
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
+PICFLAG
 ADDITIONAL_OBJS
 enable_decimal_float
 target_os
@@ -670,6 +671,7 @@ enable_option_checking
 enable_werror_always
 enable_maintainer_mode
 enable_decimal_float
+enable_host_shared
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1301,6 +1303,7 @@ Optional Features:
 			enable decimal float extension to C.  Selecting 'bid'
 			or 'dpd' choses which decimal floating point format
 			to use
+  --enable-host-shared    build host code as shared libraries
 
 Some influential environment variables:
   CC          C compiler command
@@ -4889,6 +4892,16 @@ $as_echo "#define AC_APPLE_UNIVERSAL_BUILD 1" >>confdefs.h
  esac
 
 
+# Enable --enable-host-shared.
+# Check whether --enable-host-shared was given.
+if test "${enable_host_shared+set}" = set; then :
+  enableval=$enable_host_shared; PICFLAG=-fPIC
+else
+  PICFLAG=
+fi
+
+
+
 # Output.
 
 ac_config_headers="$ac_config_headers config.h:config.in"
diff --git a/libdecnumber/configure.ac b/libdecnumber/configure.ac
index 6cfc803..dd0499c 100644
--- a/libdecnumber/configure.ac
+++ b/libdecnumber/configure.ac
@@ -95,6 +95,13 @@ AC_SUBST(ADDITIONAL_OBJS)
 
 AC_C_BIGENDIAN
 
+# Enable --enable-host-shared.
+AC_ARG_ENABLE(host-shared,
+[AS_HELP_STRING([--enable-host-shared],
+		[build host code as shared libraries])],
+[PICFLAG=-fPIC], [PICFLAG=])
+AC_SUBST(PICFLAG)
+
 # Output.
 
 AC_CONFIG_HEADERS(config.h:config.in, [echo timestamp > stamp-h1])
diff --git a/libiberty/configure b/libiberty/configure
index e601ccd..b71141a 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -4963,6 +4963,12 @@ case "${enable_shared}" in
   "") shared=no ;;
   *) shared=yes ;;
 esac
+
+# ...unless --enable-host-shared was passed from top-level config:
+if [ "${enable_host_shared}" = "yes" ]; then
+  shared=yes
+fi
+
 if [ "${shared}" != "yes" ]; then
   PICFLAG=
 fi
diff --git a/libiberty/configure.ac b/libiberty/configure.ac
index fcea46f..4ad88a9 100644
--- a/libiberty/configure.ac
+++ b/libiberty/configure.ac
@@ -225,6 +225,12 @@ case "${enable_shared}" in
   "") shared=no ;;
   *) shared=yes ;;
 esac
+
+# ...unless --enable-host-shared was passed from top-level config:
+if [[ "${enable_host_shared}" = "yes" ]]; then
+  shared=yes
+fi
+
 if [[ "${shared}" != "yes" ]]; then
   PICFLAG=
 fi
diff --git a/zlib/Makefile.am b/zlib/Makefile.am
index a9c42cb..82f709d 100644
--- a/zlib/Makefile.am
+++ b/zlib/Makefile.am
@@ -16,7 +16,7 @@ libzgcj_convenience_la_SOURCES = $(ZLIB_SOURCES)
 else
 toolexeclib_LIBRARIES = libz.a
 libz_a_SOURCES = $(ZLIB_SOURCES)
-libz_a_CFLAGS = $(AM_CFLAGS)
+libz_a_CFLAGS = $(AM_CFLAGS) $(PICFLAG)
 endif
 
 # Work around what appears to be a GNU make bug handling MAKEFLAGS
diff --git a/zlib/Makefile.in b/zlib/Makefile.in
index f5ef37a..3c8fd59 100644
--- a/zlib/Makefile.in
+++ b/zlib/Makefile.in
@@ -177,6 +177,7 @@ PACKAGE_TARNAME = @PACKAGE_TARNAME@
 PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
+PICFLAG = @PICFLAG@
 RANLIB = @RANLIB@
 SED = @SED@
 SET_MAKE = @SET_MAKE@
@@ -255,7 +256,7 @@ zconf.h.in zlib.h zutil.c zutil.h
 @TARGET_LIBRARY_TRUE@libzgcj_convenience_la_SOURCES = $(ZLIB_SOURCES)
 @TARGET_LIBRARY_FALSE@toolexeclib_LIBRARIES = libz.a
 @TARGET_LIBRARY_FALSE@libz_a_SOURCES = $(ZLIB_SOURCES)
-@TARGET_LIBRARY_FALSE@libz_a_CFLAGS = $(AM_CFLAGS)
+@TARGET_LIBRARY_FALSE@libz_a_CFLAGS = $(AM_CFLAGS) $(PICFLAG)
 
 # Work around what appears to be a GNU make bug handling MAKEFLAGS
 # values defined in terms of make variables, as is the case for CC and
diff --git a/zlib/configure b/zlib/configure
index c71984f..32e33e7 100755
--- a/zlib/configure
+++ b/zlib/configure
@@ -602,6 +602,7 @@ ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
+PICFLAG
 TARGET_LIBRARY_FALSE
 TARGET_LIBRARY_TRUE
 toolexeclibdir
@@ -736,6 +737,7 @@ with_pic
 enable_fast_install
 with_gnu_ld
 enable_libtool_lock
+enable_host_shared
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1370,6 +1372,7 @@ Optional Features:
   --enable-fast-install[=PKGS]
                           optimize for fast installation [default=yes]
   --disable-libtool-lock  avoid locking (might break parallel builds)
+  --enable-host-shared    build host code as shared libraries
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -10400,7 +10403,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10403 "configure"
+#line 10406 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10506,7 +10509,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10509 "configure"
+#line 10512 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11202,6 +11205,15 @@ else
   multilib_arg=
 fi
 
+# Check whether --enable-host-shared was given.
+if test "${enable_host_shared+set}" = set; then :
+  enableval=$enable_host_shared; PICFLAG=-fPIC
+else
+  PICFLAG=
+fi
+
+
+
 ac_config_files="$ac_config_files Makefile"
 
 cat >confcache <<\_ACEOF
diff --git a/zlib/configure.ac b/zlib/configure.ac
index 80253e4..fb8d943 100644
--- a/zlib/configure.ac
+++ b/zlib/configure.ac
@@ -119,5 +119,11 @@ else
   multilib_arg=
 fi
 
+AC_ARG_ENABLE(host-shared,
+[AS_HELP_STRING([--enable-host-shared],
+		[build host code as shared libraries])],
+[PICFLAG=-fPIC], [PICFLAG=])
+AC_SUBST(PICFLAG)
+
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
-- 
1.7.11.7


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