[Mesa-stable] [PATCH] configure.ac: Add support to enable read-only text segment on x86.

[Matt Turner]

From: Jeremy Huddleston <jeremyhu at freedesktop.org>

Cc: "10.6 11.0" <mesa-stable at lists.freedesktop.org>
Bugzilla: https://bugs.gentoo.org/240956
---
After talking with Ian today, we determined that this disables an
optimization.

And FWIW, NVIDIA's fork of glapi (libglvnd) contains this kind of
writable-text optimization for x86-64.

 configure.ac | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/configure.ac b/configure.ac
index 90ba4fe..259f770 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1289,6 +1289,16 @@ AC_SUBST(GLX_TLS, ${GLX_USE_TLS})
 AS_IF([test "x$GLX_USE_TLS" = xyes -a "x$ax_pthread_ok" = xyes],
       [DEFINES="${DEFINES} -DGLX_USE_TLS"])
 
+dnl Read-only text section on x86 hardened platforms
+AC_ARG_ENABLE([glx-read-only-text],
+    [AS_HELP_STRING([--enable-glx-read-only-text],
+        [Disable writable .text section on x86 (decreases performance) @<:@default=disabled@:>@])],
+    [enable_glx_read_only_text="$enableval"],
+    [enable_glx_read_only_text=no])
+if test "x$enable_glx_read_only_text" = xyes; then
+    DEFINES="$DEFINES -DGLX_X86_READONLY_TEXT"
+fi
+
 dnl
 dnl More DRI setup
 dnl
-- 
2.4.6