i386: Add GLIBC_ABI_GNU_TLS version dependency

On Linux/i386, programs and shared libraries compiled with
-mtls-dialect=gnu may fail silently at run-time against glibc without
the GNU TLS run-time fix for:

https://sourceware.org/bugzilla/show_bug.cgi?id=32996

The glibc version tag, GLIBC_ABI_GNU_TLS, has been added to indicate
that glibc has the working GNU TLS run-time:

commit ed1b7a5a489ab555a27fad9c101ebe2e1c1ba881
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jul 28 12:16:11 2025 -0700

    i386: Add GLIBC_ABI_GNU_TLS version [BZ #33221]

Add the --gnu-tls-tag option to x86-64 ELF linker to add the
GLIBC_ABI_GNU_TLS version dependency in output programs and shared
libraries when linking against glibc if input relocatable object files
call ___tls_get_addr.  The output will fail to load and run at run-time
against glibc which doesn't define the GLIBC_ABI_GNU_TLS version.

Add the --enable-gnu-tls-tag configure option to enable --gnu-tls-tag
by default.  If unspecified, linker will add the GLIBC_ABI_GNU_TLS
version dependency if input call ___tls_get_addr and libc.so defines
the GLIBC_ABI_GNU2_TLS version.

bfd/

	PR ld/33287
	* elf-linker-x86.h (elf_linker_x86_params): Add
	gnu_tls_version_tag.
	* elf32-i386.c (elf_backend_add_glibc_version_dependency): Add
	GLIBC_ABI_GNU_TLS support.
	* elfxx-x86.c (_bfd_x86_elf_link_check_relocs): Set
	has_tls_get_addr_call to 1 if ___tls_get_addr is used.
	* elfxx-x86.h (elf_x86_link_hash_table): Add has_tls_get_addr_call.

ld/

	PR ld/33287
	* Mention --gnu-tls-tag, --no-gnu-tls-tag and --enable-gnu-tls-tag.
	* config.in: Regenerated.
	* configure: Likewise.
	* configure.ac: Add --enable-gnu-tls-tag.
	* ld.texi: Document --gnu-tls-tag and --enable-gnu-tls-tag.
	* ldlex.h (option_values): Add OPTION_GNU_TLS_VERSION_TAG and
	OPTION_NO_GNU_TLS_VERSION_TAG.
	* emultempl/elf-i386-glibc.em (elf_i386_glibc_before_parse):
	Initialize params.gnu_tls_version_tag.
	(PARSE_AND_LIST_LONGOPTS_386): New.
	(PARSE_AND_LIST_OPTIONS_386): Likewise.
	(PARSE_AND_LIST_ARGS_CASES_386): Likewise.
	(PARSE_AND_LIST_LONGOPTS): Append $PARSE_AND_LIST_LONGOPTS_386.
	(PARSE_AND_LIST_OPTIONS): Append $PARSE_AND_LIST_OPTIONS_386.
	(PARSE_AND_LIST_ARGS_CASES): Append
	$PARSE_AND_LIST_ARGS_CASES_386.
	* testsuite/ld-i386/gnu-tls-1.s: Likewise.
	* testsuite/ld-i386/gnu-tls-1a.rd: Likewise.
	* testsuite/ld-i386/gnu-tls-1b.rd: Likewise.
	* testsuite/ld-i386/i386.exp: Run PR ld/33287 tests.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

4 files changed, 37 insertions, 1 deletions

diff --git a/ld/testsuite/ld-i386/gnu-tls-1.s b/ld/testsuite/ld-i386/gnu-tls-1.s
new file mode 100644
index 0000000..02ae207
--- /dev/null
+++ b/ld/testsuite/ld-i386/gnu-tls-1.s
@@ -0,0 +1,9 @@
+	.text
+	.p2align 4
+	.globl	func
+	.type	func, @function
+func:
+	leal	foo@tlsgd(,%ebx,1), %eax
+	call	___tls_get_addr@PLT
+	ret
+	.section	.note.GNU-stack,"",@progbits
diff --git a/ld/testsuite/ld-i386/gnu-tls-1a.rd b/ld/testsuite/ld-i386/gnu-tls-1a.rd
new file mode 100644
index 0000000..65d889d
--- /dev/null
+++ b/ld/testsuite/ld-i386/gnu-tls-1a.rd
@@ -0,0 +1,7 @@
+#...
+Version needs section '.gnu.version_r' contains [0-9]+ entries:
+ Addr: 0x[0-9a-f]+ +Offset: 0x[0-9a-f]+ +Link: +[0-9]+ +\(.dynstr\)
+ +0+: Version: 1 +File: libc\.so\.6(|\.1) +Cnt: +[0-9]+
+#...
+  0x[a-f0-9]+:   Name: GLIBC_ABI_GNU_TLS  Flags: none  Version: [0-9]+
+#pass
diff --git a/ld/testsuite/ld-i386/gnu-tls-1b.rd b/ld/testsuite/ld-i386/gnu-tls-1b.rd
new file mode 100644
index 0000000..02006e4
--- /dev/null
+++ b/ld/testsuite/ld-i386/gnu-tls-1b.rd
@@ -0,0 +1,4 @@
+#failif
+#...
+  0x[a-f0-9]+:   Name: GLIBC_ABI_GNU_TLS  Flags: none  Version: [0-9]+
+#...
diff --git a/ld/testsuite/ld-i386/i386.exp b/ld/testsuite/ld-i386/i386.exp
index 622c06e..5b189ec 100644
--- a/ld/testsuite/ld-i386/i386.exp
+++ b/ld/testsuite/ld-i386/i386.exp
@@ -1519,11 +1519,27 @@ run_ld_link_tests [list \
     ] \
 ]
 
-# The musl C library does not support --gnu2-tls-tag.
+# The musl C library does not support --gnu-tls-tag nor --gnu2-tls-tag.
 if { ![istarget *-*-musl]
      && [check_compiler_available] } {
     run_cc_link_tests [list \
 	[list \
+	    "Build gnu-tls-1a.so" \
+	    "-shared -Wl,--no-as-needed,--gnu-tls-tag" \
+	    "-fPIC" \
+	    { gnu-tls-1.s } \
+	    {{readelf {-W --version-info} gnu-tls-1a.rd}} \
+	    "gnu-tls-1a.so" \
+	] \
+	[list \
+	    "Build gnu-tls-1b.so" \
+	    "-shared -Wl,--no-as-needed,--no-gnu-tls-tag" \
+	    "-fPIC" \
+	    { gnu-tls-1.s } \
+	    {{readelf {-W --version-info} gnu-tls-1b.rd}} \
+	    "gnu-tls-1b.so" \
+	] \
+	[list \
 	    "Build gnu2-tls-1a.so" \
 	    "-shared -Wl,--no-as-needed,--gnu2-tls-tag" \
 	    "-fPIC" \