[gcc r15-4216] libstdc++: Test 17_intro/names.cc with -D_FORTIFY_SOURCE=2 [PR116210]

[Jonathan Wakely]

https://gcc.gnu.org/g:4f97411c0d45dc3d04b5d16384fee111889a7c41

commit r15-4216-g4f97411c0d45dc3d04b5d16384fee111889a7c41
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Oct 4 12:40:47 2024 +0100

    libstdc++: Test 17_intro/names.cc with -D_FORTIFY_SOURCE=2 [PR116210]
    
    Add a new testcase that repeats 17_intro/names.cc but with
    _FORTIFY_SOURCE defined, to find problems in Glibc fortify wrappers like
    https://sourceware.org/bugzilla/show_bug.cgi?id=32052 (which is fixed
    now).
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/116210
            * testsuite/17_intro/names.cc (sz): Undef for versions of Glibc
            that use it in the fortify wrappers.
            * testsuite/17_intro/names_fortify.cc: New test.

Diff:
---
 libstdc++-v3/testsuite/17_intro/names.cc         | 7 +++++++
 libstdc++-v3/testsuite/17_intro/names_fortify.cc | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/libstdc++-v3/testsuite/17_intro/names.cc b/libstdc++-v3/testsuite/17_intro/names.cc
index bea2d19ecba0..5deb310dc313 100644
--- a/libstdc++-v3/testsuite/17_intro/names.cc
+++ b/libstdc++-v3/testsuite/17_intro/names.cc
@@ -383,4 +383,11 @@
 #undef y
 #endif
 
+#if defined __GLIBC_PREREQ && defined _FORTIFY_SOURCE
+# if ! __GLIBC_PREREQ(2,41)
+// https://sourceware.org/bugzilla/show_bug.cgi?id=32052
+#  undef sz
+# endif
+#endif
+
 #include <bits/stdc++.h>
diff --git a/libstdc++-v3/testsuite/17_intro/names_fortify.cc b/libstdc++-v3/testsuite/17_intro/names_fortify.cc
new file mode 100644
index 000000000000..c975412074be
--- /dev/null
+++ b/libstdc++-v3/testsuite/17_intro/names_fortify.cc
@@ -0,0 +1,6 @@
+// { dg-do compile { target *-*-linux* } }
+// { dg-add-options no_pch }
+
+#define _FORTIFY_SOURCE 2
+// Now we can define the macros to poison uses of non-reserved names:
+#include "names.cc"