Support for building as a shared library, based on patches from

	Alan Modra <alan@spri.levels.unisa.edu.au>:
	* configure.in: Add AC_ARG_ENABLE for shared and commonbfdlib.
	New substitutions: ALLLIBS, PICFLAG, SHLIB, SHLIB_CC,
	SHLIB_CFLAGS, COMMON_SHLIB, PICLIST, SHLINK.
	* configure: Rebuild.
	* configure.host: If --enable-shared, adjust shared library stuff
	based on the host.  If the host is SunOS, and the linker supports
	-rpath, set HLDFLAGS to use it.
	* Makefile.in (ALLLIBS): New variable.
	(PICFLAG, SHLIB, SHLIB_CC, SHLIB_CFLAGS): New variables.
	(COMMON_SHLIB, SHLINK): New variables.
	(.c.o): If PICFLAG is set, compile twice, once PIC, once normal.
	(STAGESTUFF): Remove variable.
	(all): Depend upon $(ALLLIBS) and @PICLIST@ rather than
	$(TARGETLIB).
	(stamp-ofiles): New target, like old ofiles target, but build
	using a temporary file and move-if-change, and touch stamp-ofiles
	when done.
	(ofiles): Just depend upon stamp-ofiles.
	(stamp-piclist, piclist): New targets.
	($(SHLIB), $(SHLINK)): New targets.
	(targets.o, archures.o): Build twice if PICFLAG is set.
	(do_mostlyclean): Remove pic/*.o.
	(do_clean): Remove stamp-ofiles, $(SHLIB), $(SHLINK), piclist, and
	stamp-piclist.
	(do_distclean): Remove pic and stamp-picdir.
	(install): Install shared libraries.
	($(OFILES)): Depend upon stamp-picdir.
	(stamp-picdir): New target.

1 files changed, 74 insertions, 0 deletions

diff --git a/bfd/configure.host b/bfd/configure.host
index e062ac4..de8d65d 100644
--- a/bfd/configure.host
+++ b/bfd/configure.host
@@ -15,6 +15,12 @@
 #  HDEFINES		host specific compiler options
 #  host64		set to true if this is a 64 bit host
 #  HOST_64BIT_TYPE	host 64 bit type
+#  SHLIB_CC		compiler to use when building shared library
+#  SHLIB_CFLAGS		flags to use when building shared library
+#  PICFLAG		may be set to flag to use to compile PIC
+#  SHLINK		may be set to the name to link the shared library to
+#  ALLLIBS		may be set to libraries to build
+#  HLDFLAGS		LDFLAGS specific to the host
 
 HDEFINES=
 host64=false
@@ -53,6 +59,7 @@ i[345]86-*-win32)	test -z "$CC" && CC="i386-win32-gcc -O2"
 			RANLIB=${RANLIB-i386-win32-ranlib}
 			;;
 
+mips-dec-netbsd*)	;;
 mips-dec-*)		HDEFINES="-G 4"	;;
 mips-sgi-irix3*)	HDEFINES="-G 4"
 			test -z "$LDFLAGS" && LDFLAGS=-lmalloc
@@ -83,3 +90,70 @@ powerpc-*-aix4*)	HDEFINES=-DHOST_AIX ;;
 powerpc-*-aix*)		HDEFINES=-DHOST_AIX ;;
 
 esac
+
+# If we are configuring with --enable-shared, adjust the shared
+# library support based on the host.  This support must work for both
+# the BFD and the opcodes libraries.
+SHLIB_CC='$(CC)'
+SHLIB_CFLAGS='-shared'
+if [ "${shared}" = "true" ]; then
+  case "${host}" in
+  hppa*-*-*)		picfrag=../config/mh-papic ;;
+  i[3456]86-*-*)	picfrag=../config/mh-x86pic ;;
+  *-*-*)		picfrag=../config/mh-${host_cpu}pic ;;
+  esac
+  if [ -f "${picfrag}" ]; then
+    pic=`sed -n -e 's/^PICFLAG[ 	]*=[ 	]*\(.*\)$/\1/p' ${picfrag}`
+    if [ -n "${pic}" ]; then
+      PICFLAG=${pic}
+    fi
+  fi
+
+  base_shlib=`echo ${SHLIB} | sed -e 's,^.*/\([^/]*\)$,\1,'`
+
+  case "${host}" in
+  *-dec-osf*)
+    # -fpic is not needed on the Alpha.
+    PICFLAG=
+    ;;
+  *-*-hpux*)
+    # HP/UX uses .sl for shared libraries.
+    SHLINK=`echo ${SHLINK} | sed -e 's/so$/sl/'`
+    ;;
+  *-*-irix5*)
+    # -fpic is not needed on Irix 5.
+    PICFLAG=
+    SHLIB_CFLAGS="-shared -Wl,-soname,${base_shlib}"
+    ;;
+  *-*-linux*aout*)
+    ;;
+  *-*-linux*)
+    SHLIB_CFLAGS="-shared -Wl,-soname,${base_shlib}"
+    ;;
+  *-*-sysv4* | *-*-solaris*)
+    SHLIB_CFLAGS="-shared -h ${base_shlib}"
+    ;;
+  *-*-sunos*)
+    ALLLIBS=`echo ${ALLLIBS} | sed -e 's/\$(SHLINK)//'`
+    ;;
+  esac
+fi
+
+# On SunOS, if the linker supports the -rpath option, use it to
+# prevent ../bfd and ../opcodes from being included in the run time
+# search path.
+HLDFLAGS=
+case "${host}" in
+  *-*-sunos*)
+    echo 'main () { }' > conftest.c
+    ${CC} -o conftest -Wl,-rpath= conftest.c >/dev/null 2>conftest.t
+    if grep 'unrecognized' conftest.t >/dev/null 2>&1; then
+      :
+    elif grep 'No such file' conftest.t >/dev/null 2>&1; then
+      :
+    else
+      HLDFLAGS='-Wl,-rpath='
+    fi
+    rm -f conftest.t conftest.c conftest
+    ;;
+esac