[gcc r12-1814] libstdc++: More workarounds in 17_intro/names.cc test [PR 97088]

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:e83a5a6b6893e910dc0b6b1cd034e1a258406c93

commit r12-1814-ge83a5a6b6893e910dc0b6b1cd034e1a258406c93
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jun 25 18:31:22 2021 +0100

    libstdc++: More workarounds in 17_intro/names.cc test [PR 97088]
    
    Conditionally #undef some more names that are used in system headers.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/97088
            * testsuite/17_intro/names.cc: Undef more names for newlib and
            also for arm-none-linux-gnueabi.
            * testsuite/experimental/names.cc: Disable PCH.

Diff:
---
 libstdc++-v3/testsuite/17_intro/names.cc     | 14 ++++++++++++++
 libstdc++-v3/testsuite/experimental/names.cc |  1 +
 2 files changed, 15 insertions(+)

diff --git a/libstdc++-v3/testsuite/17_intro/names.cc b/libstdc++-v3/testsuite/17_intro/names.cc
index 534dab70ff5..805c1002c3f 100644
--- a/libstdc++-v3/testsuite/17_intro/names.cc
+++ b/libstdc++-v3/testsuite/17_intro/names.cc
@@ -208,6 +208,11 @@
 #undef r
 #endif
 
+#if defined (__linux__) && defined (__arm__)
+// <sys/ucontext.h> defines fpregset_t::fpregs::j
+#undef j
+#endif
+
 #if defined (__linux__) && defined (__powerpc__)
 // <asm/types.h> defines __vector128::u
 #undef u
@@ -220,6 +225,15 @@
 #if ! __has_include(<newlib.h>)
 // newlib's <sys/cdefs.h> defines __lockable as a macro, so we can't use it.
 # define __lockable		cannot be used as an identifier
+// newlib's <time.h> defines __tzrule_type with these members.
+#undef d
+#undef m
+#undef n
+#undef s
+// newlib's <math.h> uses this for parameters
+#undef x
+// newlib's <inttypes.h> uses this for parameters
+#undef j
 #endif
 
 #ifdef __sun__
diff --git a/libstdc++-v3/testsuite/experimental/names.cc b/libstdc++-v3/testsuite/experimental/names.cc
index 34ec3ba5968..d695a258f2c 100644
--- a/libstdc++-v3/testsuite/experimental/names.cc
+++ b/libstdc++-v3/testsuite/experimental/names.cc
@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-do compile { target c++11 } }
+// { dg-add-options no_pch }
 
 // Define macros for some common variables names that we must not use for
 // naming variables, parameters etc. in the library.