commit db03874df9843ab98c4faeb658f04d17e6db83a6
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Oct 8 15:33:00 2020 +0200

    elf: Print the full name of the dynamic loader in the ld.so help message
    
    This requires defining a macro for the full path, matching the
    -Wl,--dynamic-link= arguments used for linking glibc programs,
    and ldd script.
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

diff --git a/elf/Makefile b/elf/Makefile
index e5666e5bf7817c3c..bc96b8fd65e376cc 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -641,7 +641,8 @@ libof-ldconfig = ldconfig
 CFLAGS-dl-cache.c += $(SYSCONF-FLAGS)
 CFLAGS-cache.c += $(SYSCONF-FLAGS)
 CFLAGS-rtld.c += $(SYSCONF-FLAGS)
-CFLAGS-dl-usage.c += $(SYSCONF-FLAGS)
+CFLAGS-dl-usage.c += $(SYSCONF-FLAGS) \
+  -D'RTLD="$(rtlddir)/$(rtld-installed-name)"'
 
 cpp-srcs-left := $(all-rtld-routines:=.os)
 lib := rtld
diff --git a/elf/dl-usage.c b/elf/dl-usage.c
index 8c24c13770500df9..1003a435bfc2b39e 100644
--- a/elf/dl-usage.c
+++ b/elf/dl-usage.c
@@ -76,6 +76,8 @@ setting environment variables (which would be inherited by subprocesses).\n\
   --argv0 STRING        set argv[0] to STRING before running\n\
   --help                display this help and exit\n\
   --version             output version information and exit\n\
+\n\
+This program interpreter self-identifies as: " RTLD "\n\
 ",
               argv0);
   _exit (EXIT_SUCCESS);