[gcc r11-3749] libstdc++: Fix unused variable warning

[Jonathan Wakely]

https://gcc.gnu.org/g:afcbeb35e0b9fb0251d04362a1bd4031520ff7f8

commit r11-3749-gafcbeb35e0b9fb0251d04362a1bd4031520ff7f8
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Oct 9 11:52:56 2020 +0100

    libstdc++: Fix unused variable warning
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/util/testsuite_performance.h (report_header): Remove
            unused variable.

Diff:
---
 libstdc++-v3/testsuite/util/testsuite_performance.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/util/testsuite_performance.h b/libstdc++-v3/testsuite/util/testsuite_performance.h
index 8927a4129da..9b69f5f51f7 100644
--- a/libstdc++-v3/testsuite/util/testsuite_performance.h
+++ b/libstdc++-v3/testsuite/util/testsuite_performance.h
@@ -249,7 +249,6 @@ namespace __gnu_test
   void
   report_header(const std::string file, const std::string header)
   {
-    const char space = ' ';
     const char tab = '\t';
     const char* name = "libstdc++-performance.sum";
     std::string::const_iterator i = file.begin() + file.find_last_of('/') + 1;