[glibc/azanella/clang] elf: Fix tests that require interposable symbols

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c551185493dc92d7704fbdabc8bbd8271000fe36

commit c551185493dc92d7704fbdabc8bbd8271000fe36
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Jan 17 15:21:25 2024 -0300

    elf: Fix tests that require interposable symbols
    
    clang defaults to -fsemantic-interposition, which in turn trigger some
    optimizations (like inline) that makes some tests that rely on ELF
    symbol interposition to fail.  For this case, explicit set the symbol as
    weak to avoid it.

Diff:
---
 elf/tst-dlclose-lazy-mod2.c | 1 +
 elf/tst-piemod1.c           | 1 +
 2 files changed, 2 insertions(+)

diff --git a/elf/tst-dlclose-lazy-mod2.c b/elf/tst-dlclose-lazy-mod2.c
index d1ae34330c..544803ca3e 100644
--- a/elf/tst-dlclose-lazy-mod2.c
+++ b/elf/tst-dlclose-lazy-mod2.c
@@ -20,6 +20,7 @@
 #include <stdlib.h>
 
 void
+__attribute__ ((weak))
 exported_function (int ignored)
 {
   /* This function is interposed from tst-dlclose-lazy-mod1.so and
diff --git a/elf/tst-piemod1.c b/elf/tst-piemod1.c
index 72d7e0a187..225c057ea3 100644
--- a/elf/tst-piemod1.c
+++ b/elf/tst-piemod1.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 
 int
+__attribute__((weak))
 foo (void)
 {
   return 21;