Use -Wl,-R instead of -R

[aurisc4]

For compatibility with GCC 4.6.
Also submitting this to:
https://bugzilla.gnome.org/show_bug.cgi?id=641416

--- ../gnote/m4/boost.m4    2011-01-25 14:30:18.000000000 +0200
+++ m4/boost.m4 2011-02-27 20:57:11.686221539 +0200
@@ -403,7 +403,7 @@
       LDFLAGS=$boost_save_LDFLAGS
       LIBS=$boost_save_LIBS
       if test x"$Boost_lib" = xyes; then
-        Boost_lib_LDFLAGS="-L$boost_ldpath -R$boost_ldpath"
+        Boost_lib_LDFLAGS="-L$boost_ldpath -Wl,-R$boost_ldpath"
         Boost_lib_LDPATH="$boost_ldpath"
         break 6
       else

[tsuna]

How come GCC 4.6 no longer supports -R?

[aurisc4]

I think -R is linker option, not GCC. I think in this case this statement from release notes applies:
GCC now has stricter checks for invalid command-line options. In particular, when gcc was called to link object files rather than compile source code, it would previously accept and ignore all options starting with --, including linker options such as --as-needed and --export-dynamic, although such options would result in errors if any source code was compiled. Such options, if unknown to the compiler, are now rejected in all cases; if the intent was to pass them to the linker, options such as -Wl,--as-needed should be used.

[tsuna]

Use -Wl to pass arguments to the linker.

This is more correct than giving -R directly to GCC. Actually, GCC 4.6
doesn't seem to like -R at all. Closed by 7d76670.

[DrMcCoy]

Unfortunately, for some reason, -Wl,-R instead of -R apparently fails for MacOS X gcc 4.2.1 (which, as I was told, is the latest Apple offers).

Anyone with an insight into MacOS X gcc here, perchance?

[DrMcCoy]

Okay, dug around a bit with the friend with a Mac that told me of the issues in the first place, and apparently, MacOS X's ld doesn't know -R. It does work when passing "-Wl,-rpath $boost_ldpath" (note the space, MacOS X's ld doesn't like a "=" there either) to gcc, though.
Of course, I have no idea how well that works on other systems, only that it works with ld64-97.17 on MacOS X and ld 2.21.0.20110327 on Debian Linux.

[tsuna]

Seems like we need a separate test to find whether the compiler/linker support -R or -rpath, and then we AC_REQUIRE that test. Would you like to open a new issue for this?

[DrMcCoy]

Sure: #19