[OE-core] [PATCH V2] glibc: improve reproducibility with multilib

[Hongxu Jia]

Multilib builds specify several loaders which will end up embedded in
some binaries or script files. To support reproducible builds, we must
ensure the loaders are always in deterministic order.

[YOCTO #2655]
[YOCTO #12478]
[YOCTO #12480]

Signed-off-by: Juro Bystricky <juro.bystricky at intel.com>

Improve the fix and rebase it to 2.28

Here is the log of lib32-glibc
[log.do_compile]
|Adjust ldd script
|ldd "/lib64/ld-linux-x86-64.so.2 /lib/ld-linux.so.2 /lib/ld-linux.so.2
/lib64/ld-linux-x86-64.so.2" -> "/lib/ld-linux.so.2 /lib64/ld-linux-x86-64.so.2"
[log.do_compile]

Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
 meta/recipes-core/glibc/glibc-ld.inc  | 4 ++--
 meta/recipes-core/glibc/glibc_2.28.bb | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/meta/recipes-core/glibc/glibc-ld.inc b/meta/recipes-core/glibc/glibc-ld.inc
index bb167b3..041ffbb 100644
--- a/meta/recipes-core/glibc/glibc-ld.inc
+++ b/meta/recipes-core/glibc/glibc-ld.inc
@@ -10,8 +10,8 @@ def glibc_dl_info(d):
         infos['ldconfig'].add('{"' + loader + '",' + "FLAG_ELF_LIBC6" + ' }')
         infos['lddrewrite'].add(loader)
 
-    infos['ldconfig'] = ','.join(infos['ldconfig'])
-    infos['lddrewrite'] = ' '.join(infos['lddrewrite'])
+    infos['ldconfig'] = ','.join(sorted(infos['ldconfig']))
+    infos['lddrewrite'] = ' '.join(sorted(infos['lddrewrite']))
     return infos
 
 EGLIBC_KNOWN_INTERPRETER_NAMES = "${@glibc_dl_info(d)['ldconfig']}"
diff --git a/meta/recipes-core/glibc/glibc_2.28.bb b/meta/recipes-core/glibc/glibc_2.28.bb
index d072939..a107c58 100644
--- a/meta/recipes-core/glibc/glibc_2.28.bb
+++ b/meta/recipes-core/glibc/glibc_2.28.bb
@@ -122,10 +122,10 @@ do_compile () {
 	if [ -n "${RTLDLIST}" ]
 	then
 		prevrtld=`cat ${B}/elf/ldd | grep "^RTLDLIST=" | sed 's#^RTLDLIST="\?\([^"]*\)"\?$#\1#'`
-		if [ "${prevrtld}" != "${RTLDLIST}" ]
-		then
-			sed -i ${B}/elf/ldd -e "s#^RTLDLIST=.*\$#RTLDLIST=\"${prevrtld} ${RTLDLIST}\"#"
-		fi
+		# remove duplicate entries
+		newrtld=`echo $(printf '%s\n' ${prevrtld} ${RTLDLIST} | LC_ALL=C sort -u)`
+		echo "ldd \"${prevrtld} ${RTLDLIST}\" -> \"${newrtld}\""
+		sed -i ${B}/elf/ldd -e "s#^RTLDLIST=.*\$#RTLDLIST=\"${newrtld}\"#"
 	fi
 
 }
-- 
2.7.4