From 608219fb2917d407058952adf164eb616880662b Mon Sep 17 00:00:00 2001
From: Tom Tromey <tom@tromey.com>
Date: Tue, 27 Mar 2018 08:55:13 -0600
Subject: [PATCH] Include <cmath> in dwarf-index-write.c
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On x86-64 Fedora 26, when building with the system gcc, I get:

../../binutils-gdb/gdb/dwarf-index-write.c: In member function ‘void debug_names::build()’:
../../binutils-gdb/gdb/dwarf-index-write.c:705:13: error: ‘pow’ is not a member of ‘std’

There are actually more messages, but this is sufficient to show the
problem.

The fix is to include <cmath>.

I'm checking this in as obvious.  Tested by building.

gdb/ChangeLog
2018-03-27  Tom Tromey  <tom@tromey.com>

	* dwarf-index-write.c: Include <cmath>.
---
 gdb/ChangeLog           | 4 ++++
 gdb/dwarf-index-write.c | 1 +
 2 files changed, 5 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 79c981de219..8cbb7259b2e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2018-03-27  Tom Tromey  <tom@tromey.com>
+
+	* dwarf-index-write.c: Include <cmath>.
+
 2018-03-27  Joel Brobecker  <brobecker@adacore.com>
 
 	* NEWS: Add entry describing new "set|show varsize-limit" command.
diff --git a/gdb/dwarf-index-write.c b/gdb/dwarf-index-write.c
index 3059e0b776a..058712d9e22 100644
--- a/gdb/dwarf-index-write.c
+++ b/gdb/dwarf-index-write.c
@@ -34,6 +34,7 @@
 #include "psympriv.h"
 
 #include <algorithm>
+#include <cmath>
 #include <set>
 #include <unordered_map>
 #include <unordered_set>
-- 
2.30.2