[Bug libc/31655] clang can't build glibc with stack protector

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31655

--- Comment #4 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
I think we make explicit the constraints in the code, where we can't call
external symbols in static build.  Something like:

diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h
index 5a98f70364..1943dc7db6 100644
--- a/sysdeps/x86/dl-cacheinfo.h
+++ b/sysdeps/x86/dl-cacheinfo.h
@@ -98,6 +98,12 @@ static const struct intel_02_cache_info

 #define nintel_02_known (sizeof (intel_02_known) / sizeof (intel_02_known
[0]))

+/* The bsearch is called early during process initialization before TCB has
+   been set up; and if the compiler does not enable __extern_inline it might
call
+   the symbol which might use an invalid thread-pointer.  */
+#define bsearch bsearch_inline
+#include <bits/stdlib-bsearch.h>
+
 static int
 intel_02_known_compare (const void *p1, const void *p2)
 {
@@ -214,8 +220,8 @@ intel_check_word (int name, unsigned int value, bool
*has_level_2,
          struct intel_02_cache_info search;

          search.idx = byte;
-         found = bsearch (&search, intel_02_known, nintel_02_known,
-                          sizeof (intel_02_known[0]), intel_02_known_compare);
+         found = bsearch_inline (&search, intel_02_known, nintel_02_known,
+                                 sizeof (intel_02_known[0]),
intel_02_known_compare);
          if (found != NULL)
            {
              if (found->rel_name == folded_rel_name)

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