Re: [PATCH] reloc-ldflags: Fix handling of multiple relocatable library directories.

[Bruno Haible]

Hi Ben,

Thanks for the patch! You are right: since none of the platforms for which
reloc-ldflags is being used is AIX, HP-UX, IRIX — these are the platforms
for which libtool.m4 defines hardcode_libdir_separator to ':' —, the rpath
options are cumulative.

I applied your patch, revising comments and a variable name.


2020-09-19  Ben Pfaff  <b...@cs.stanford.edu>
            Bruno Haible  <br...@clisp.org>

        relocatable-prog: Fix for multiple relocatable library directories.
        * build-aux/reloc-ldflags: Fix handling of multiple relocatable library
        directories.  Each one needs its own -Wl,-rpath,$dir option, instead of
        being attached to a single one.

diff --git a/build-aux/reloc-ldflags b/build-aux/reloc-ldflags
index 145e741..cdb2f47 100755
--- a/build-aux/reloc-ldflags
+++ b/build-aux/reloc-ldflags
@@ -68,7 +68,9 @@ case "$host_os" in
     ;;
 esac
 if test -n "$origin_token"; then
-  rpath=
+  # We are not on AIX, HP-UX, or IRIX. Therefore the -rpath options are
+  # cumulative.
+  rpath_options=
   save_IFS="$IFS"; IFS=":"
   for dir in $library_path_value; do
     IFS="$save_IFS"
@@ -89,8 +91,8 @@ if test -n "$origin_token"; then
           idir=`echo "$idir" | sed -e 's,^//*[^/]*,,'`
         done
         dir="$origin_token"`echo "$idir" | sed -e 's,//*[^/]*,/..,g'`"$dir"
-        # Add dir to rpath.
-        rpath="${rpath}${rpath:+ }$dir"
+        # Augment rpath_options with dir.
+        rpath_options="${rpath_options}${rpath_options:+ }-Wl,-rpath,$dir"
         ;;
       *)
         if test -n "$dir"; then
@@ -101,15 +103,14 @@ if test -n "$origin_token"; then
   done
   IFS="$save_IFS"
   # Output it.
-  if test -n "$rpath"; then
+  if test -n "$rpath_options"; then
     case "$host_os" in
       # At least some versions of FreeBSD, DragonFly, and OpenBSD need the
       # linker option "-z origin". See <https://lekensteyn.nl/rpath.html>.
       freebsd* | dragonfly* | openbsd*)
-        echo "-Wl,-z,origin -Wl,-rpath,$rpath" ;;
-      *)
-        echo "-Wl,-rpath,$rpath" ;;
+        rpath_options="-Wl,-z,origin $rpath_options" ;;
     esac
+    echo "$rpath_options"
   fi
 else
   echo "relocation via rpath not supported on this system: $host" 1>&2