commit 4ca9a6b5766a64b5a2e8972f1b059a578d8388cd
author Yi Kong <yikong@google.com> Thu Feb 28 14:14:30 2019 -0800
committer Yi Kong <yikong@google.com> Thu Feb 28 15:54:58 2019 -0800
tree 8ee767b15e5a1d276fffa70c583eac46b11c1982
parent 6b65e078099ea8f9b5e570d43c5d7135b40e7fde

Workaround string-plus-int warning

The upcoming compiler warns against adding string and int:
In file included from bionic/libc/bionic/strsignal.cpp:41:
  bionic/libc/private/bionic_sigdefs.h:58:1: error: adding 'int' to a string does not append to the string [-Werror,-Wstring-plus-int]
  __BIONIC_SIGDEF(SIGWINCH,  "Window size changed")
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  bionic/libc/bionic/strsignal.cpp:40:83: note: expanded from macro '__BIONIC_SIGDEF'
  #define __BIONIC_SIGDEF(signal_number, unused) [ signal_number ] = #signal_number + 3,
                                                                     ~~~~~~~~~~~~~~~^~~

Use array indexing index to avoid this warning.

Test: m checkbuild
Change-Id: Ib5e20edbf5bac76352df0484dd233d0621beb4e9

libc/bionic/strsignal.cpp

diff --git a/libc/bionic/strsignal.cpp b/libc/bionic/strsignal.cpp
index 5637431..05d3498 100644
--- a/libc/bionic/strsignal.cpp
+++ b/libc/bionic/strsignal.cpp
@@ -37,7 +37,7 @@
 };
 
 const char* const sys_signame[NSIG] = {
-#define __BIONIC_SIGDEF(signal_number, unused) [ signal_number ] = #signal_number + 3,
+#define __BIONIC_SIGDEF(signal_number, unused) [ signal_number ] = &(#signal_number)[3],
 #include "private/bionic_sigdefs.h"
 };