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[2356] introduce the helper m4 macro to identify -R variant linker options

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extracted from the top-level configure.ac.
This commit is contained in:
JINMEI Tatuya 2012-10-31 15:31:29 -07:00
parent 5e97750478
commit 9f360b39c7
3 changed files with 43 additions and 2 deletions
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3
examples/configure.ac
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@ -13,6 +13,9 @@ AC_LANG([C++])
# Checks for BIND 10 headers and libraries
AX_ISC_BIND10
if test "x$BIND10_RPATH" != "x"; then
LDFLAGS="$LDFLAGS $BIND10_RPATH"
fi
# For the example host program, we require the BIND 10 DNS library
if test "x$BIND10_DNS_LIB" = "x"; then

9
examples/m4/ax_isc_bind10.m4
View File

@ -1,4 +1,4 @@
dnl @synopsis AX_BIND10
dnl @synopsis AX_ISC_BIND10
dnl
dnl @summary figure out how to build C++ programs using ISC BIND 10 libraries
dnl
@ -23,6 +23,7 @@ dnl BIND10_xxx_LIB is defined.
AC_DEFUN([AX_ISC_BIND10], [
AC_REQUIRE([AX_BOOST_INCLUDE])
AC_REQUIRE([AX_ISC_RPATH])
AC_LANG_SAVE
AC_LANG([C++])
@ -82,7 +83,11 @@ do
#include <util/buffer.h>
],[
isc::util::OutputBuffer buffer(0);
], [BIND10_LDFLAGS="-L${d}"])
], [BIND10_LDFLAGS="-L${d}"
if test "x$ISC_RPATH_FLAG" != "x"; then
BIND10_RPATH="-R${d}"
fi
])
if test "x$BIND10_LDFLAGS" != "x"; then
break
fi

33
examples/m4/ax_isc_rpath.m4 Normal file
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@ -0,0 +1,33 @@
dnl @synopsis AX_ISC_RPATH
dnl
dnl @summary figure out whether and which "rpath" linker option is available
dnl
dnl This macro checks if the linker supports an option to embed a path
dnl to a runtime library (often installed in an uncommon place), such as
dnl gcc's -rpath option. If found, it sets the ISC_RPATH_FLAG variable to
dnl the found option flag. The main configure.ac can use it as follows:
dnl if test "x$ISC_RPATH_FLAG" != "x"; then
dnl LDFLAGS="$LDFLAGS ${ISC_RPATH_FLAG}/usr/local/lib/some_library"
dnl fi
AC_DEFUN([AX_ISC_RPATH], [
# check -R and -Wl,-R rather than gcc specific -rpath to be as portable
# as possible.
AC_MSG_CHECKING([whether -R flag is available in linker])
LDFLAGS_SAVED="$LDFLAGS"
LDFLAGS="$LDFLAGS -R/usr/lib"
AC_TRY_LINK([],[],
[ AC_MSG_RESULT(yes)
ISC_RPATH_FLAG=-R
],[ AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether -Wl,-R flag is available in linker])
LDFLAGS="$LDFLAGS_SAVED -Wl,-R"
AC_TRY_LINK([], [],
[ AC_MSG_RESULT(yes)
ISC_RPATH_FLAG=-Wl,-R
],[ AC_MSG_RESULT(no) ])
])
LDFLAGS=$LDFLAGS_SAVED
])dnl AX_ISC_RPATH