On Mon, Nov 14, 2022 at 8:36 PM Oleg Smolsky <osmol...@netskope.com> wrote:
> Hello folks! I've been using libtool (via autotools) for a while, but have
> been unable to find a clean solution to the following problem:
>
> I have a static `liblocal.la` (built in my build system) that links to a
> third-party shared lib. Obviously I can use my own lib to express that
> dependency:
>
> liblocal_la_LIBADD = -lexternal -L/somewhere/lib
>
> The missing bit of functionality is -Wl,-rpath,/somewhere/lib that I need
> to impose onto the leaf-level executables that link my local lib.
> Unfortunately these attempts do not work:
> 1. Cannot add that flag to _LIBADD as libtool complains: "...belong in
> 'liblocal_la_LDFLAGS"
> 2. Cannot add that flag to _LDFLAGS as it does not carry all the way to
> the leaf-level executable
>
> I have found that I can manually jam the flag into the
> `inherited_linker_flags` variable inside the .la file and that gives me the
> desired result... but I don't know how to do that via Makefile.am.
>
...and I found a hack that lets me jam these flags into the
`inherited_linker_flags` variable. Here is a patch for the `libtool` script
generated by libtool into $builddir:
```
--- libtool.base 2022-11-14 21:18:04.867760568 -0800
+++ libtool.patched 2022-11-14 21:17:32.967784300 -0800
@@ -7826,6 +7826,7 @@
;;
-Wl,*)
+ func_append new_inherited_linker_flags " $arg"
func_stripname '-Wl,' '' "$arg"
args=$func_stripname_result
arg=
```
Leaving it here for posterity. Perhaps someone will do this with a bit more
finesse and turn it into a proper feature.
Oleg.
