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-rw-r--r--source4/build/m4/check_ld.m4196
1 files changed, 196 insertions, 0 deletions
diff --git a/source4/build/m4/check_ld.m4 b/source4/build/m4/check_ld.m4
index 3840459894..b98c2dab3c 100644
--- a/source4/build/m4/check_ld.m4
+++ b/source4/build/m4/check_ld.m4
@@ -1,6 +1,7 @@
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
@@ -8,3 +9,198 @@ 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="
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *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"
+ ## ${CFLAGS} added for building 64-bit shared
+ ## libs using Sun's Compiler
+ LDSHFLAGS="-G \${CFLAGS}"
+ PICSUFFIX="po.o"
+ fi
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512,[The size of a block])
+ ;;
+ *sunos*) AC_DEFINE(SUNOS4,1,[Whether the host os is sunos4])
+ BLDSHARED="true"
+ LDSHFLAGS="-G"
+ PICFLAG="-KPIC" # Is this correct for SunOS
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *netbsd* | *freebsd*) BLDSHARED="true"
+ LDSHFLAGS="-shared"
+ DYNEXP="-Wl,--export-dynamic"
+ PICFLAG="-fPIC -DPIC"
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512,[The size of a block])
+ ;;
+ *openbsd*) BLDSHARED="true"
+ LDSHFLAGS="-shared"
+ DYNEXP="-Wl,-Bdynamic"
+ PICFLAG="-fPIC"
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512,[The size of a block])
+ ;;
+ *irix*) AC_DEFINE(IRIX,1,[Whether the host os is irix])
+ ATTEMPT_WRAP32_BUILD=yes
+ BLDSHARED="true"
+ LDSHFLAGS="-set_version sgi1.0 -shared"
+ SONAMEFLAG="-soname "
+ SHLD="\${LD}"
+ if test "${GCC}" = "yes"; then
+ PICFLAG="-fPIC"
+ else
+ PICFLAG="-KPIC"
+ fi
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512,[The size of a block])
+ ;;
+ *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
+
+ AC_DEFINE(STAT_ST_BLOCKSIZE,DEV_BSIZE,[The size of a block])
+ ;;
+ *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 $ac_cv_prog_cc_Ae = yes; then
+ BLDSHARED="true"
+ SHLD="/usr/bin/ld"
+ LDSHFLAGS="-B symbolic -b -z"
+ SONAMEFLAG="+h "
+ PICFLAG="+z"
+ fi
+ DYNEXP="-Wl,-E"
+ AC_DEFINE(STAT_ST_BLOCKSIZE,8192,[The size of a block])
+ ;;
+ *qnx*) AC_DEFINE(QNX,1,[Whether the host os is qnx])
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *osf*) AC_DEFINE(OSF1,1,[Whether the host os is osf1])
+ BLDSHARED="true"
+ LDSHFLAGS="-shared"
+ SONAMEFLAG="-Wl,-soname,"
+ PICFLAG="-fPIC"
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *sco*) AC_DEFINE(SCO,1,[Whether the host os is sco unix])
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *unixware*) AC_DEFINE(UNIXWARE,1,[Whether the host os is unixware])
+ BLDSHARED="true"
+ LDSHFLAGS="-shared"
+ SONAMEFLAG="-Wl,-soname,"
+ PICFLAG="-KPIC"
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *next2*) AC_DEFINE(NEXT2,1,[Whether the host os is NeXT v2])
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *dgux*) AC_CHECK_PROG( ROFF, groff, [groff -etpsR -Tascii -man])
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *sysv4*) AC_DEFINE(SYSV,1,[Whether this is a system V system])
+ case "$host" in
+ *-univel-*) if [ test "$GCC" != yes ]; then
+ AC_DEFINE(HAVE_MEMSET,1,[Whether memset() is available])
+ fi
+ LDSHFLAGS="-G"
+ DYNEXP="-Bexport"
+ ;;
+ *mips-sni-sysv4*) AC_DEFINE(RELIANTUNIX,1,[Whether the host os is reliantunix]);;
+ esac
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+
+ *sysv5*) AC_DEFINE(SYSV,1,[Whether this is a system V system])
+ if [ test "$GCC" != yes ]; then
+ AC_DEFINE(HAVE_MEMSET,1,[Whether memset() is available])
+ fi
+ LDSHFLAGS="-G"
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+ *-vms)
+ BLDSHARED="false"
+ LDSHFLAGS=""
+ ;;
+ *vos*) AC_DEFINE(STAT_ST_BLOCKSIZE,4096)
+ BLDSHARED="false"
+ LDSHFLAGS=""
+ ;;
+ *)
+ AC_DEFINE(STAT_ST_BLOCKSIZE,512)
+ ;;
+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
+
+