[committed][testsuite] Fix compile warnings for def-decl with clang

[Tom de Vries]

Hi,

When running the test-suite with clang, we run into these warnings:
...
clang++ decl.c def.c def2.c -Itestsuite/dwz.tests -o def-decl -g
clang-10.0: warning: treating 'c' input as 'c++' when in C++ mode, \
  this behavior is deprecated [-Wdeprecated]
clang-10.0: warning: treating 'c' input as 'c++' when in C++ mode, \
  this behavior is deprecated [-Wdeprecated]
clang-10.0: warning: treating 'c' input as 'c++' when in C++ mode, \
  this behavior is deprecated [-Wdeprecated]
...

Fix these by renaming the source files from .c to .cc.

Committed to trunk.

Thanks,
- Tom

[testsuite] Fix compile warnings for def-decl with clang

2021-02-16  Tom de Vries  <tdevries@suse.de>

	* testsuite/dwz.tests/decl.c: Rename to .cc.
	* testsuite/dwz.tests/def.c: Same.
	* testsuite/dwz.tests/def2.c: Same.
	* Makefile (def-decl): Update source file names.

---
 Makefile                                | 4 ++--
 testsuite/dwz.tests/{decl.c => decl.cc} | 0
 testsuite/dwz.tests/{def.c => def.cc}   | 0
 testsuite/dwz.tests/{def2.c => def2.cc} | 0
 4 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 3fa3a27..d320266 100644
--- a/Makefile
+++ b/Makefile
@@ -128,8 +128,8 @@ odr-loc:
 
 
 def-decl:
-	$(CXX) $(TEST_SRC)/decl.c $(TEST_SRC)/def.c $(TEST_SRC)/def2.c -I$(TEST_SRC) \
-	  -o $@ -g
+	$(CXX) $(TEST_SRC)/decl.cc $(TEST_SRC)/def.cc $(TEST_SRC)/def2.cc \
+	  -I$(TEST_SRC) -o $@ -g
 
 # On some systems we need to set and export DEJAGNU to suppress
 # WARNING: Couldn't find the global config file.
diff --git a/testsuite/dwz.tests/decl.c b/testsuite/dwz.tests/decl.cc
similarity index 100%
rename from testsuite/dwz.tests/decl.c
rename to testsuite/dwz.tests/decl.cc
diff --git a/testsuite/dwz.tests/def.c b/testsuite/dwz.tests/def.cc
similarity index 100%
rename from testsuite/dwz.tests/def.c
rename to testsuite/dwz.tests/def.cc
diff --git a/testsuite/dwz.tests/def2.c b/testsuite/dwz.tests/def2.cc
similarity index 100%
rename from testsuite/dwz.tests/def2.c
rename to testsuite/dwz.tests/def2.cc