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-rw-r--r--user/rsb/project-sets.rst9
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diff --git a/user/rsb/project-sets.rst b/user/rsb/project-sets.rst
index 54a3f8e..ce839c5 100644
--- a/user/rsb/project-sets.rst
+++ b/user/rsb/project-sets.rst
@@ -116,6 +116,15 @@ build sets:
``--with-objc``
Attempt to build a C++ compiler.
+``--with-newlib-tls`` or ``--without-newlib-tls``
+ Enable or disable the ``--enable-newlib-reent-thread-local`` Newlib
+ configuration option. This option is enabled by default on the aarch64, arm,
+ nios2, powerpc, riscv, and sparc targets. If this option is enabled, then
+ each member of the Newlib struct _reent is replaced by a dedicated
+ thread-local object. The thread-local objects are defined in translation
+ units which use the corresponding object so that only objects used by the
+ application are linked in.
+
The RSB provides build sets for some BSPs. These build sets will build:
- Compiler, linker, debugger and RTEMS Tools.