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PATCH: Implement ELF linker -z global option
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: binutils at sourceware dot org
- Date: Tue, 20 Nov 2012 08:48:17 -0800
- Subject: PATCH: Implement ELF linker -z global option
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
Hi,
This path implements ELF linker -z global option to set
#define DF_1_GLOBAL 0x00000002 /* Set RTLD_GLOBAL for this object. */
OK to install?
Thanks.
H.J.
---
ld/
2012-11-16 H.J. Lu <hongjiu.lu@intel.com>
* ld.texinfo: Document "-z global".
* emultempl/elf32.em (gld${EMULATION_NAME}_handle_option): Support
"-z global".
(gld${EMULATION_NAME}_list_options): Likewise.
ld/testsuite/
2012-11-16 H.J. Lu <hongjiu.lu@intel.com>
* ld-elf/global1.d: New file.
diff --git a/ld/emultempl/elf32.em b/ld/emultempl/elf32.em
index 9e263a9..acb01e5 100644
--- a/ld/emultempl/elf32.em
+++ b/ld/emultempl/elf32.em
@@ -2300,6 +2300,8 @@ fragment <<EOF
EOF
if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
fragment <<EOF
+ else if (strcmp (optarg, "global") == 0)
+ link_info.flags_1 |= (bfd_vma) DF_1_GLOBAL;
else if (strcmp (optarg, "initfirst") == 0)
link_info.flags_1 |= (bfd_vma) DF_1_INITFIRST;
else if (strcmp (optarg, "interpose") == 0)
@@ -2419,6 +2421,9 @@ EOF
if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
fragment <<EOF
fprintf (file, _("\
+ -z global Make symbols in DSO available for subsequently\n\
+ loaded objects\n"));
+ fprintf (file, _("\
-z initfirst Mark DSO to be initialized first at runtime\n"));
fprintf (file, _("\
-z interpose Mark object to interpose all DSOs but executable\n"));
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index 4a8118f..7670e96 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -1024,6 +1024,11 @@ shared libraries are still allowed.
@item execstack
Marks the object as requiring executable stack.
+@item global
+This option is only meaningful when building a shared object. It makes
+the symbols defined by this shared object available for symbol resolution
+of subsequently loaded libraries.
+
@item initfirst
This option is only meaningful when building a shared object.
It marks the object so that its runtime initialization will occur
diff --git a/ld/testsuite/ld-elf/global1.d b/ld/testsuite/ld-elf/global1.d
new file mode 100644
index 0000000..eae7f0d
--- /dev/null
+++ b/ld/testsuite/ld-elf/global1.d
@@ -0,0 +1,8 @@
+#source: start.s
+#ld: -shared -z global
+#readelf: -d
+#target: *-*-linux* *-*-gnu*
+
+#...
+ 0x0*6ffffffb \(FLAGS_1\) *Flags: GLOBAL
+#pass