Exclude routines from fortification

Since the _FORTIFY_SOURCE feature uses some routines of Glibc, they need to
be excluded from the fortification.

On top of that:
 - some tests explicitly verify that some level of fortification works
   appropriately, we therefore shouldn't modify the level set for them.
 - some objects need to be build with optimization disabled, which
   prevents _FORTIFY_SOURCE to be used for them.

Assembler files that implement architecture specific versions of the
fortified routines were not excluded from _FORTIFY_SOURCE as there is no
C header included that would impact their behavior.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/stdlib/Makefile b/stdlib/Makefile
index 0975f55ee6..25e42a77e7 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -145,6 +145,13 @@ routines := \
   xpg_basename \
   # routines
 
+# Exclude fortified routines from being built with _FORTIFY_SOURCE
+routines_no_fortify += \
+  mbstowcs \
+  wcstombs \
+  wctomb \
+  # routines_no_fortify
+
 aux = \
   grouping \
   groupingwc \