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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
dnl Check if we use GNU ld
AC_PATH_PROG(LD, ld)
AC_PROG_LD_GNU
AC_PATH_PROG(AR, ar)
AC_SUBST(SHLIBEXT)
AC_SUBST(LDSHFLAGS)
AC_SUBST(SONAMEFLAG)
AC_SUBST(DYNEXP)
AC_SUBST(PICFLAG)
AC_SUBST(BLDSHARED)
# Assume non-shared by default and override below
BLDSHARED="false"
# these are the defaults, good for lots of systems
DYNEXP=
HOST_OS="$host_os"
LDSHFLAGS="-shared"
SONAMEFLAG=""
SHLD="\${CC}"
PICFLAG=""
PICSUFFIX="po"
SHLIBEXT="so"
AC_MSG_CHECKING([ability to build shared libraries])
# and these are for particular systems
case "$host_os" in
*linux*)
AC_DEFINE(LINUX,1,[Whether the host os is linux])
BLDSHARED="true"
LDSHFLAGS="-shared"
DYNEXP="-Wl,--export-dynamic"
PICFLAG="-fPIC"
SONAMEFLAG="-Wl,-soname="
;;
*solaris*)
AC_DEFINE(SUNOS5,1,[Whether the host os is solaris])
BLDSHARED="true"
LDSHFLAGS="-G"
if test "${GCC}" = "yes"; then
PICFLAG="-fPIC"
if test "${ac_cv_prog_gnu_ld}" = "yes"; then
DYNEXP="-Wl,-E"
fi
else
PICFLAG="-KPIC"
## ${CFLAGS} added for building 64-bit shared
## libs using Sun's Compiler
LDSHFLAGS="-G \${CFLAGS}"
PICSUFFIX="po.o"
fi
;;
*sunos*)
AC_DEFINE(SUNOS4,1,[Whether the host os is sunos4])
BLDSHARED="true"
LDSHFLAGS="-G"
PICFLAG="-KPIC" # Is this correct for SunOS
;;
*netbsd* | *freebsd*)
BLDSHARED="true"
LDSHFLAGS="-shared"
DYNEXP="-Wl,--export-dynamic"
PICFLAG="-fPIC -DPIC"
;;
*openbsd*)
BLDSHARED="true"
LDSHFLAGS="-shared"
DYNEXP="-Wl,-Bdynamic"
PICFLAG="-fPIC"
;;
*irix*)
AC_DEFINE(IRIX,1,[Whether the host os is irix])
ATTEMPT_WRAP32_BUILD=yes
BLDSHARED="true"
LDSHFLAGS="-set_version sgi1.0 -shared"
SONAMEFLAG="-soname "
SHLD="\${LD}"
if test "${GCC}" = "yes"; then
PICFLAG="-fPIC"
else
PICFLAG="-KPIC"
fi
;;
*aix*)
AC_DEFINE(AIX,1,[Whether the host os is aix])
BLDSHARED="true"
LDSHFLAGS="-Wl,-bexpall,-bM:SRE,-bnoentry,-berok"
DYNEXP="-Wl,-brtl,-bexpall,-bbigtoc"
PICFLAG="-O2"
if test "${GCC}" != "yes"; then
## for funky AIX compiler using strncpy()
CFLAGS="$CFLAGS -D_LINUX_SOURCE_COMPAT -qmaxmem=32000"
fi
;;
*hpux*)
AC_DEFINE(HPUX,1,[Whether the host os is HPUX])
SHLIBEXT="sl"
# Use special PIC flags for the native HP-UX compiler.
if test $ac_cv_prog_cc_Ae = yes; then
BLDSHARED="true"
SHLD="/usr/bin/ld"
LDSHFLAGS="-B symbolic -b -z"
SONAMEFLAG="+h "
PICFLAG="+z"
fi
DYNEXP="-Wl,-E"
;;
*qnx*)
AC_DEFINE(QNX,1,[Whether the host os is qnx])
;;
*osf*)
AC_DEFINE(OSF1,1,[Whether the host os is osf1])
BLDSHARED="true"
LDSHFLAGS="-shared"
SONAMEFLAG="-Wl,-soname,"
PICFLAG="-fPIC"
;;
*sco*)
AC_DEFINE(SCO,1,[Whether the host os is sco unix])
;;
*unixware*)
AC_DEFINE(UNIXWARE,1,[Whether the host os is unixware])
BLDSHARED="true"
LDSHFLAGS="-shared"
SONAMEFLAG="-Wl,-soname,"
PICFLAG="-KPIC"
;;
*next2*)
AC_DEFINE(NEXT2,1,[Whether the host os is NeXT v2])
;;
*dgux*)
;;
*sysv4*)
AC_DEFINE(SYSV,1,[Whether this is a system V system])
case "$host" in
*-univel-*)
if [ test "$GCC" != yes ]; then
AC_DEFINE(HAVE_MEMSET,1,[Whether memset() is available])
fi
LDSHFLAGS="-G"
DYNEXP="-Bexport"
;;
*mips-sni-sysv4*)
AC_DEFINE(RELIANTUNIX,1,[Whether the host os is reliantunix])
;;
esac
;;
*sysv5*)
AC_DEFINE(SYSV,1,[Whether this is a system V system])
if [ test "$GCC" != yes ]; then
AC_DEFINE(HAVE_MEMSET,1,[Whether memset() is available])
fi
LDSHFLAGS="-G"
;;
*-vms)
BLDSHARED="false"
LDSHFLAGS=""
;;
*vos*)
BLDSHARED="false"
LDSHFLAGS=""
;;
*)
;;
esac
AC_MSG_RESULT($BLDSHARED)
AC_MSG_CHECKING([linker flags for shared libraries])
AC_MSG_RESULT([$LDSHFLAGS])
AC_MSG_CHECKING([compiler flags for position-independent code])
AC_MSG_RESULT([$PICFLAGS])
#######################################################
# test whether building a shared library actually works
if test $BLDSHARED = true; then
AC_CACHE_CHECK([whether building shared libraries actually works],
[ac_cv_shlib_works],[
ac_cv_shlib_works=no
# try building a trivial shared library
if test "$PICSUFFIX" = "po"; then
$CC $CPPFLAGS $CFLAGS $PICFLAG -c -o shlib.po ${srcdir-.}/build/tests/shlib.c &&
$CC $CPPFLAGS $CFLAGS `eval echo $LDSHFLAGS` -o shlib.so shlib.po &&
ac_cv_shlib_works=yes
else
$CC $CPPFLAGS $CFLAGS $PICFLAG -c -o shlib.$PICSUFFIX ${srcdir-.}/build/tests/shlib.c &&
mv shlib.$PICSUFFIX shlib.po &&
$CC $CPPFLAGS $CFLAGS `eval echo $LDSHFLAGS` -o shlib.so shlib.po &&
ac_cv_shlib_works=yes
fi
rm -f shlib.so shlib.po
])
if test $ac_cv_shlib_works = no; then
BLDSHARED=false
fi
fi
|
