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61 lines
2.5 KiB
Plaintext
61 lines
2.5 KiB
Plaintext
dnl @synopsis AX_ISC_RPATH
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dnl
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dnl @summary figure out whether and which "rpath" linker option is available
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dnl
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dnl This macro checks if the linker supports an option to embed a path
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dnl to a runtime library (often installed in an uncommon place), such as the
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dnl commonly used -R option. If found, it sets the ISC_RPATH_FLAG variable to
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dnl the found option flag. The main configure.ac can use it as follows:
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dnl if test "x$ISC_RPATH_FLAG" != "x"; then
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dnl LDFLAGS="$LDFLAGS ${ISC_RPATH_FLAG}/usr/local/lib/some_library"
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dnl fi
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dnl
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dnl If you pass --disable-rpath to configure, ISC_RPATH_FLAG is not set
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AC_DEFUN([AX_ISC_RPATH], [
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AC_ARG_ENABLE(rpath,
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[AC_HELP_STRING([--disable-rpath], [don't hardcode library path into binaries])],
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rpath=$enableval, rpath=yes)
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if test x$rpath != xno; then
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# We'll tweak both CXXFLAGS and CCFLAGS so this function will work
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# whichever language is used in the main script. Note also that it's not
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#LDFLAGS; technically this is a linker flag, but we've noticed $LDFLAGS
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# can be placed where the compiler could interpret it as a compiler
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# option, leading to subtle failure mode. So, in the check below using
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# the compiler flag is safer (in the actual Makefiles the flag should be
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# set in LDFLAGS).
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CXXFLAGS_SAVED="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS -Wl,-R/usr/lib"
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CCFLAGS_SAVED="$CCFLAGS"
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CCFLAGS="$CCFLAGS -Wl,-R/usr/lib"
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# check -Wl,-R and -R rather than gcc specific -rpath to be as portable
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# as possible. -Wl,-R seems to be safer, so we try it first. In some
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# cases -R is not actually recognized but AC_TRY_LINK doesn't fail due to
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# that.
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AC_MSG_CHECKING([whether -Wl,-R flag is available in linker])
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AC_TRY_LINK([],[],
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[ AC_MSG_RESULT(yes)
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ISC_RPATH_FLAG=-Wl,-R
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],[ AC_MSG_RESULT(no)
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AC_MSG_CHECKING([whether -R flag is available in linker])
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# Apple clang 5.1 is now considers unknown parameters passed to linker (ld) as errors.
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# However, the same unknown parameters passed to compiler (g++ ) are merely threated
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# as warnings. To make sure that we pick those up, is to use -Werror.
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CXXFLAGS="$CXXFLAGS_SAVED -R/usr/lib"
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CCFLAGS="$CCFLAGS_SAVED -R/usr/lib"
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AC_TRY_LINK([], [],
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[ AC_MSG_RESULT([yes; note that -R is more sensitive about the position in option arguments])
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ISC_RPATH_FLAG=-R
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],[ AC_MSG_RESULT(no) ])
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])
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CXXFLAGS=$CXXFLAGS_SAVED
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CCFLAGS=$CCFLAGS_SAVED
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fi
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])dnl AX_ISC_RPATH
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