This patch adds tests for -Wstring-plus-char.

gcc/ChangeLog:

2017-06-12  Xi Ruoyao  <ryxi@stu.xidian.edu.cn>

	* testsuite/c-c++-common/Wstring-plus-char.c: New test.
	* testsuite/g++.dg/Wstring-plus-char-1.C: Ditto.
	* testsuite/g++.dg/Wstring-plus-char-2.C: Ditto.
	* testsuite/g++.dg/Wstring-plus-char-3.C: Ditto.
---
 gcc/testsuite/c-c++-common/Wstring-plus-char.c | 26 +++++++++++++++++++++
 gcc/testsuite/g++.dg/Wstring-plus-char-1.C     | 16 +++++++++++++
 gcc/testsuite/g++.dg/Wstring-plus-char-2.C     | 26 +++++++++++++++++++++
 gcc/testsuite/g++.dg/Wstring-plus-char-3.C     | 32 ++++++++++++++++++++++++++
 4 files changed, 100 insertions(+)
 create mode 100644 gcc/testsuite/c-c++-common/Wstring-plus-char.c
 create mode 100644 gcc/testsuite/g++.dg/Wstring-plus-char-1.C
 create mode 100644 gcc/testsuite/g++.dg/Wstring-plus-char-2.C
 create mode 100644 gcc/testsuite/g++.dg/Wstring-plus-char-3.C

-- 
Xi Ruoyao <ryxi@stu.xidian.edu.cn>
School of Aerospace Science and Technology, Xidian University