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[2667] Add --disable-rpath configure switch.

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Some dynamic linkers are wise enough (at least the Linux one) to correctly pick
needed shared libraries without hardcoded rpath. The --disable-rpath configure
switch allows distributors to avoid hardcoded rpath paths in libraries and
executables.

Signed-off-by: Adam Tkac <atkac@redhat.com>
This commit is contained in:
Adam Tkac 2013-01-10 18:04:04 +01:00 committed by JINMEI Tatuya
parent 937c982cf3
commit 1c50c5a6ee
1 changed files with 32 additions and 24 deletions
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56
examples/m4/ax_isc_rpath.m4
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@ -9,38 +9,46 @@ 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
dnl
dnl If you pass --disable-rpath to configure, ISC_RPATH_FLAG is not set
AC_DEFUN([AX_ISC_RPATH], [
# We'll tweak both CXXFLAGS and CCFLAGS so this function will work whichever
# language is used in the main script. Note also that it's not LDFLAGS;
# technically this is a linker flag, but we've noticed $LDFLAGS can be placed
# where the compiler could interpret it as a compiler option, leading to
# subtle failure mode. So, in the check below using the compiler flag is
# safer (in the actual Makefiles the flag should be set in LDFLAGS).
CXXFLAGS_SAVED="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -Wl,-R/usr/lib"
CCFLAGS_SAVED="$CCFLAGS"
CCFLAGS="$CCFLAGS -Wl,-R/usr/lib"
AC_ARG_ENABLE(rpath,
[AC_HELP_STRING([--disable-rpath], [don't hardcode library path into binaries])],
rpath=$enableval, rpath=yes)
# check -Wl,-R and -R rather than gcc specific -rpath to be as portable
# as possible. -Wl,-R seems to be safer, so we try it first. In some cases
# -R is not actually recognized but AC_TRY_LINK doesn't fail due to that.
AC_MSG_CHECKING([whether -Wl,-R flag is available in linker])
AC_TRY_LINK([],[],
[ AC_MSG_RESULT(yes)
ISC_RPATH_FLAG=-Wl,-R
],[ AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether -R flag is available in linker])
CXXFLAGS="$CXXFLAGS_SAVED -R"
CCFLAGS="$CCFLAGS_SAVED -R"
if test x$rpath != xno; then
# We'll tweak both CXXFLAGS and CCFLAGS so this function will work whichever
# language is used in the main script. Note also that it's not LDFLAGS;
# technically this is a linker flag, but we've noticed $LDFLAGS can be placed
# where the compiler could interpret it as a compiler option, leading to
# subtle failure mode. So, in the check below using the compiler flag is
# safer (in the actual Makefiles the flag should be set in LDFLAGS).
CXXFLAGS_SAVED="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -Wl,-R/usr/lib"
CCFLAGS_SAVED="$CCFLAGS"
CCFLAGS="$CCFLAGS -Wl,-R/usr/lib"
# check -Wl,-R and -R rather than gcc specific -rpath to be as portable
# as possible. -Wl,-R seems to be safer, so we try it first. In some cases
# -R is not actually recognized but AC_TRY_LINK doesn't fail due to that.
AC_MSG_CHECKING([whether -Wl,-R flag is available in linker])
AC_TRY_LINK([],[],
[ AC_MSG_RESULT(yes)
ISC_RPATH_FLAG=-Wl,-R
],[ AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether -R flag is available in linker])
CXXFLAGS="$CXXFLAGS_SAVED -R"
CCFLAGS="$CCFLAGS_SAVED -R"
AC_TRY_LINK([], [],
[ AC_MSG_RESULT([yes; note that -R is more sensitive about the position in option arguments])
ISC_RPATH_FLAG=-R
],[ AC_MSG_RESULT(no) ])
])
])
CXXFLAGS=$CXXFLAGS_SAVED
CCFLAGS=$CCFLAGS_SAVED
CXXFLAGS=$CXXFLAGS_SAVED
CCFLAGS=$CCFLAGS_SAVED
fi
])dnl AX_ISC_RPATH