about summary refs log tree commit diff
path: root/scripts/versions.awk
diff options
context:
space:
mode:
authorH.J. Lu <hjl.tools@gmail.com>2021-11-19 06:18:56 -0800
committerH.J. Lu <hjl.tools@gmail.com>2022-04-26 10:16:11 -0700
commit57292f574156f817b7cbeb33ea6278c6eab22bcc (patch)
tree07c80714e7f6aa9a74647bbe1585e1c921f27ba4 /scripts/versions.awk
parent4610b24f5e4e6d2c4b769594efa6d460943163bb (diff)
downloadglibc-57292f574156f817b7cbeb33ea6278c6eab22bcc.tar.gz
glibc-57292f574156f817b7cbeb33ea6278c6eab22bcc.tar.xz
glibc-57292f574156f817b7cbeb33ea6278c6eab22bcc.zip
Add GLIBC_ABI_DT_RELR for DT_RELR support
The EI_ABIVERSION field of the ELF header in executables and shared
libraries can be bumped to indicate the minimum ABI requirement on the
dynamic linker.  However, EI_ABIVERSION in executables isn't checked by
the Linux kernel ELF loader nor the existing dynamic linker.  Executables
will crash mysteriously if the dynamic linker doesn't support the ABI
features required by the EI_ABIVERSION field.  The dynamic linker should
be changed to check EI_ABIVERSION in executables.

Add a glibc version, GLIBC_ABI_DT_RELR, to indicate DT_RELR support so
that the existing dynamic linkers will issue an error on executables with
GLIBC_ABI_DT_RELR dependency.  When there is a DT_VERNEED entry with
libc.so on DT_NEEDED, issue an error if there is a DT_RELR entry without
GLIBC_ABI_DT_RELR dependency.

Support __placeholder_only_for_empty_version_map as the placeholder symbol
used only for empty version map to generate GLIBC_ABI_DT_RELR without any
symbols.
Diffstat (limited to 'scripts/versions.awk')
-rw-r--r--scripts/versions.awk7
1 files changed, 6 insertions, 1 deletions
diff --git a/scripts/versions.awk b/scripts/versions.awk
index 357ad1355e..d70b07bd1a 100644
--- a/scripts/versions.awk
+++ b/scripts/versions.awk
@@ -185,8 +185,13 @@ END {
 	closeversion(oldver, veryoldver);
 	veryoldver = oldver;
       }
-      printf("%s {\n  global:\n", $2) > outfile;
       oldver = $2;
+      # Skip the placeholder symbol used only for empty version map.
+      if ($3 == "__placeholder_only_for_empty_version_map;") {
+	printf("%s {\n", $2) > outfile;
+	continue;
+      }
+      printf("%s {\n  global:\n", $2) > outfile;
     }
     printf("   ") > outfile;
     for (n = 3; n <= NF; ++n) {