[gcc r11-5380] libstdc++: Fix test failure on AIX

[Jonathan Wakely]

https://gcc.gnu.org/g:1a8d1f54de371de88b2604d8c0e4e01306be8870

commit r11-5380-g1a8d1f54de371de88b2604d8c0e4e01306be8870
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Nov 25 16:58:05 2020 +0000

    libstdc++: Fix test failure on AIX
    
    This fixes a failure on AIX 7.2:
    
    FAIL: 17_intro/names.cc (test for excess errors)
    Excess errors:
    /home/jwakely/src/gcc/libstdc++-v3/testsuite/17_intro/names.cc:99: error: expected identifier before '(' token
    /usr/include/sys/var.h:187: error: expected unqualified-id before '{' token
    /usr/include/sys/var.h:187: error: expected ')' before '{' token
    /usr/include/sys/var.h:337: error: expected unqualified-id before ';' token
    /usr/include/sys/var.h:337: error: expected ')' before ';' token
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/17_intro/names.cc: Do not test 'v' on AIX.

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

diff --git a/libstdc++-v3/testsuite/17_intro/names.cc b/libstdc++-v3/testsuite/17_intro/names.cc
index 5a61c97e989..2c8bfff26e1 100644
--- a/libstdc++-v3/testsuite/17_intro/names.cc
+++ b/libstdc++-v3/testsuite/17_intro/names.cc
@@ -193,6 +193,8 @@
 #undef r
 #undef x
 #undef y
+// <sys/var.h> defines vario::v
+#undef v
 #endif
 
 #ifdef __hpux__