Compat symbols in abilist files

[Florian Weimer <fweimer at redhat dot com>]

I've come up with the attached patch to mark compat symbols as such in 
the abilist files.

Do we want to do this?  The downside is that when building glibc in 
certain non-standard configurations, some symbols are not compat symbols 
anymore (the prime example is probably --enable-obsolete-rpc).  On the 
other hand, the additional verification is valuable.

Thanks,
Florian

ABI checks: Mark compat symbols with "<compat>"

2017-04-13  Florian Weimer  <fweimer@redhat.com>

	* scripts/abilist.awk: Mark compat symbols with "<compat>."

diff --git a/scripts/abilist.awk b/scripts/abilist.awk
index bd740d4..cb17373 100644
--- a/scripts/abilist.awk
+++ b/scripts/abilist.awk
@@ -46,7 +46,10 @@ $2 == "g" || $2 == "w" && (NF == 7 || NF == 8) {
   size = " 0x" size;
   version = $6;
   symbol = $NF;
-  gsub(/[()]/, "", version);
+  weak = version ~ /^\(.*\)$/;
+  if (weak) {
+    gsub(/[()]/, "", version);
+  }
 
   # binutils versions up through at least 2.23 have some bugs that
   # caused STV_HIDDEN symbols to appear in .dynsym, though that is useless.
@@ -102,6 +105,10 @@ $2 == "g" || $2 == "w" && (NF == 7 || NF == 8) {
   if (desc == "")
     desc = symbol " " type size;
 
+  if (weak) {
+    desc = desc " <compat>";
+  }
+
   if (combine)
     version = soname " " version (combine_fullname ? " " sofullname : "");