https://gcc.gnu.org/g:96a291c4bb0b8a00b0a125e6a60f60072ffe53a7
commit r16-3355-g96a291c4bb0b8a00b0a125e6a60f60072ffe53a7
Author: Sam James <s...@gentoo.org>
Date: Sat Aug 23 00:54:01 2025 +0100
i386: wire up --with-tls to control -mtls-dialect= default
Allow passing --with-tls= at configure-time to control the default value
of -mtls-dialect= for i386 and x86_64. The default itself (gnu) is not
changed
unless --with-tls= is passed.
--with-tls= is already wired up for ARM and RISC-V.
gcc/ChangeLog:
PR target/120933
* config.gcc (supported_defaults): Add tls for i386, x86_64.
* config/i386/i386.h (host_detect_local_cpu): Add tls.
* doc/install.texi: Document --with-tls= for i386, x86_64.
Diff:
---
gcc/config.gcc | 13 ++++++++++++-
gcc/config/i386/i386.h | 3 ++-
gcc/doc/install.texi | 3 +++
3 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/gcc/config.gcc b/gcc/config.gcc
index db813a7b561c..04e88cce00d5 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4658,7 +4658,7 @@ case "${target}" in
;;
i[34567]86-*-* | x86_64-*-*)
- supported_defaults="abi arch arch_32 arch_64 cpu cpu_32 cpu_64
tune tune_32 tune_64"
+ supported_defaults="abi arch arch_32 arch_64 cpu cpu_32 cpu_64
tune tune_32 tune_64 tls"
for which in arch arch_32 arch_64 cpu cpu_32 cpu_64 tune
tune_32 tune_64; do
eval "val=\$with_$which"
case " $x86_archs " in
@@ -4717,6 +4717,17 @@ case "${target}" in
;;
esac
done
+
+ # Handle --with-tls.
+ case "$with_tls" in
+ ""|gnu|gnu2)
+ # OK
+ ;;
+ *)
+ echo "Unknown TLS method used in --with-tls=$with_tls"
1>&2
+ exit 1
+ ;;
+ esac
;;
riscv*-*-*)
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 2fbc1f6e9826..2d53db683176 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -644,7 +644,8 @@ extern const char *host_detect_local_cpu (int argc, const
char **argv);
{"cpu_64", "%{" OPT_ARCH64
":%{!mtune=*:%{!mcpu=*:%{!march=*:-mtune=%(VALUE)}}}}" }, \
{"arch", "%{!march=*:-march=%(VALUE)}"}, \
{"arch_32", "%{" OPT_ARCH32 ":%{!march=*:-march=%(VALUE)}}"}, \
- {"arch_64", "%{" OPT_ARCH64 ":%{!march=*:-march=%(VALUE)}}"},
+ {"arch_64", "%{" OPT_ARCH64 ":%{!march=*:-march=%(VALUE)}}"}, \
+ {"tls", "%{!mtls-dialect=*:-mtls-dialect=%(VALUE)}"},
/* Specs for the compiler proper */
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 74232247d8b7..6913035b5966 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -1254,6 +1254,9 @@ descriptor-based dialect.
For RISC-V targets, possible values for @var{dialect} are @code{trad} or
@code{desc}, which select between the traditional GNU dialect and the GNU TLS
descriptor-based dialect.
+For i386, x86-64 targets, possible values for @var{dialect} are @code{gnu} or
+@code{gnu2}, which select between the original GNU dialect and the GNU TLS
+descriptor-based dialect.
@item --enable-multiarch
Specify whether to enable or disable multiarch support. The default is
