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|
dnl SMB Build Environment LD Checks
dnl -------------------------------------------------------
dnl Copyright (C) Stefan (metze) Metzmacher 2004
dnl Copyright (C) Jelmer Vernooij 2006
dnl Released under the GNU GPL
dnl -------------------------------------------------------
dnl
AC_PATH_PROG(PROG_LD,ld)
LD=${PROG_LD}
AC_PROG_LD_GNU
LD=""
AC_PATH_PROG(PROG_AR, ar)
AC_SUBST(STLD)
AC_SUBST(STLD_FLAGS)
AC_SUBST(BLDSHARED)
AC_SUBST(LD)
AC_SUBST(LDFLAGS)
AC_SUBST(SHLD)
AC_SUBST(SHLD_FLAGS)
AC_SUBST(SHLD_UNDEF_FLAGS)
AC_SUBST(SHLIBEXT)
AC_SUBST(SONAMEFLAG)
AC_SUBST(PICFLAG)
# Assume non-shared by default and override below
# these are the defaults, good for lots of systems
STLD=${PROG_AR}
STLD_FLAGS="-rcs"
BLDSHARED="false"
LD="${CC}"
SHLD="${CC}"
SHLD_FLAGS="-shared"
SHLIBEXT="so"
SONAMEFLAG=""
PICFLAG=""
# allow for --with-hostld=gcc
AC_ARG_WITH(hostld,[ --with-hostld=linker choose host linker],
[HOSTLD=$withval],
[
if test z"$cross_compiling" = "yes"; then
HOSTLD='$(HOSTCC)'
else
HOSTLD='$(LD)'
fi
])
AC_MSG_CHECKING([ability to build shared libraries])
# and these are for particular systems
case "$host_os" in
*linux*)
BLDSHARED="true"
SHLD_FLAGS="-shared -Wl,-Bsymbolic"
SHLD_UNDEF_FLAGS="-Wl,--allow-shlib-undefined"
LDFLAGS="$LDFLAGS -Wl,--export-dynamic"
PICFLAG="-fPIC"
SONAMEFLAG="-Wl,-soname="
;;
*solaris*)
BLDSHARED="true"
SHLD_FLAGS="-G"
SONAMEFLAG="-h "
if test "${GCC}" = "yes"; then
PICFLAG="-fPIC"
SONAMEFLAG="-Wl,-soname="
if test "${ac_cv_prog_gnu_ld}" = "yes"; then
LDFLAGS="$LDFLAGS -Wl,-E"
fi
else
PICFLAG="-KPIC"
## ${CFLAGS} added for building 64-bit shared
## libs using Sun's Compiler
SHLD_FLAGS="-G \${CFLAGS}"
fi
;;
*sunos*)
BLDSHARED="true"
SHLD_FLAGS="-G"
SONAMEFLAG="-Wl,-h,"
PICFLAG="-KPIC" # Is this correct for SunOS
;;
*netbsd* | *freebsd* | *dragonfly* )
BLDSHARED="true"
LDFLAGS="$LDFLAGS -Wl,--export-dynamic"
SONAMEFLAG="-Wl,-soname,"
PICFLAG="-fPIC -DPIC"
;;
*openbsd*)
# disabled because us4 fails to link libtorture.so
BLDSHARED="false"
LDFLAGS="$LDFLAGS -Wl,-Bdynamic"
SONAMEFLAG="-Wl,-soname,"
PICFLAG="-fPIC"
;;
*irix*)
# disabled because us4 fails to link libtorture.so
BLDSHARED="false"
SHLD_FLAGS="-set_version sgi1.0 -shared"
SONAMEFLAG="-soname "
SHLD="${PROG_LD}"
if test "${GCC}" = "yes"; then
PICFLAG="-fPIC"
else
PICFLAG="-KPIC"
fi
;;
*aix*)
# disabled because us4 fails to link libtorture.so
BLDSHARED="false"
SHLD_FLAGS="-Wl,-G,-bexpall,-bbigtoc"
LDFLAGS="$LDFLAGS -Wl,-brtl,-bexpall,-bbigtoc"
# as AIX code is always position independent...
PICFLAG="-O2"
;;
*hpux*)
# Use special PIC flags for the native HP-UX compiler.
if test $ac_cv_prog_cc_Ae = yes; then
BLDSHARED="true"
SHLD_FLAGS="-b -Wl,-B,symbolic,-b,-z"
SONAMEFLAG="-Wl,+h "
PICFLAG="+z"
elif test "${GCC}" = "yes"; then
BLDSHARED="true" # I hope this is correct
PICFLAG="-fPIC"
fi
if test "$host_cpu" = "ia64"; then
SHLIBEXT="so"
LDFLAGS="$LDFLAGS -Wl,-E,+b/usr/local/lib/hpux32:/usr/lib/hpux32"
else
SHLIBEXT="sl"
LDFLAGS="$LDFLAGS -Wl,-E,+b/usr/local/lib:/usr/lib"
fi
;;
*osf*)
# disabled because tru64 fails to link libtorture.so
BLDSHARED="false"
SONAMEFLAG="-Wl,-soname,"
PICFLAG="-fPIC"
;;
*unixware*)
BLDSHARED="true"
SONAMEFLAG="-Wl,-soname,"
PICFLAG="-KPIC"
;;
*darwin*)
BLDSHARED="true"
SHLD_FLAGS="-bundle -flat_namespace -undefined suppress"
SHLIBEXT="dylib"
;;
esac
AC_MSG_RESULT($BLDSHARED)
AC_MSG_CHECKING([LD])
AC_MSG_RESULT([$LD])
AC_MSG_CHECKING([LDFLAGS])
AC_MSG_RESULT([$LDFLAGS])
AC_SUBST(HOSTLD)
AC_MSG_CHECKING([STLD])
AC_MSG_RESULT([$STLD])
AC_MSG_CHECKING([STLD_FLAGS])
AC_MSG_RESULT([$STLD_FLAGS])
#######################################################
# test whether building a shared library actually works
if test $BLDSHARED = true; then
AC_MSG_CHECKING([SHLD])
AC_MSG_RESULT([$SHLD])
AC_MSG_CHECKING([SHLD_FLAGS])
AC_MSG_RESULT([$SHLD_FLAGS])
AC_MSG_CHECKING([SHLIBEXT])
AC_MSG_RESULT([$SHLIBEXT])
AC_MSG_CHECKING([SONAMEFLAG])
AC_MSG_RESULT([$SONAMEFLAG])
AC_MSG_CHECKING([PICFLAG])
AC_MSG_RESULT([$PICFLAG])
AC_CACHE_CHECK([whether building shared libraries actually works],
[ac_cv_shlib_works],[
ac_cv_shlib_works=no
# try building a trivial shared library
${CC} ${CFLAGS} ${PICFLAG} -c ${srcdir-.}/build/tests/shlib.c -o shlib.o &&
${SHLD} `eval echo ${SHLD_FLAGS} ` -o shlib.${SHLIBEXT} shlib.o &&
ac_cv_shlib_works=yes
rm -f shlib.${SHLIBEXT} shlib.o
])
if test $ac_cv_shlib_works = no; then
BLDSHARED=false
fi
fi
if test $BLDSHARED != true; then
SHLD="shared-libraries-disabled"
SHLD_FLAGS="shared-libraries-disabled"
SHLIBEXT="shared_libraries_disabled"
SONAMEFLAG="shared-libraries-disabled"
PICFLAG=""
AC_MSG_CHECKING([SHLD])
AC_MSG_RESULT([$SHLD])
AC_MSG_CHECKING([SHLD_FLAGS])
AC_MSG_RESULT([$SHLD_FLAGS])
AC_MSG_CHECKING([SHLIBEXT])
AC_MSG_RESULT([$SHLIBEXT])
AC_MSG_CHECKING([SONAMEFLAG])
AC_MSG_RESULT([$SONAMEFLAG])
AC_MSG_CHECKING([PICFLAG])
AC_MSG_RESULT([$PICFLAG])
fi
AC_DEFINE_UNQUOTED(SHLIBEXT, "$SHLIBEXT", [Shared library extension])
AC_MSG_CHECKING([if we can link using the selected flags])
AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
AC_MSG_RESULT(yes),
AC_MSG_ERROR([we cannot link with the selected cc and ld flags. Aborting configure]),
AC_MSG_WARN([cannot run when cross-compiling]))
USESHARED=false
AC_SUBST(USESHARED)
AC_ARG_ENABLE(dso,
[ --enable-dso Enable using shared libraries internally (experimental)],
[],[enable_dso=no])
if test x"$enable_dso" = x"yes" -a x"$BLDSHARED" != x"true"; then
AC_MSG_ERROR([--enable-dso: no support for shared libraries])
fi
if test x"$enable_dso" != x"no"; then
USESHARED=$BLDSHARED
fi
AC_MSG_CHECKING([if binaries will use shared libraries])
AC_MSG_RESULT([$USESHARED])
|
