[PATCH liburing v2 7/8] test/Makefile: Omit `-Wmissing-prototypes` from the C++ compiler flags

[Ammar Faizi <ammarfaizi2@gnuweeb.org>]

From: Ammar Faizi <ammarfaizi2@gnuweeb.org>

This is a preparation patch to integrate -Wmissing-prototypes to the
CI test robot. Clang++ is not happy with -Wmissing-prototypes:

    cc1plus: warning: command-line option '-Wmissing-prototypes' \
    is valid for C/ObjC but not for C++

Omit this flag when we are compiling a C++ source file.

Using -Wmissing-prototypes ensures we mark functions and variables as
static if we don't use them outside the translation unit.

Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
 test/Makefile | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/test/Makefile b/test/Makefile
index 8ad9964..87b1fe1 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -214,8 +214,17 @@ helpers.o: helpers.c
 %.t: %.c $(helpers) helpers.h ../src/liburing.a
 	$(QUIET_CC)$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< $(helpers) $(LDFLAGS)
 
+#
+# Clang++ is not happy with -Wmissing-prototypes:
+#
+#   cc1plus: warning: command-line option '-Wmissing-prototypes' \
+#   is valid for C/ObjC but not for C++
+#
 %.t: %.cc $(helpers) helpers.h ../src/liburing.a
-	$(QUIET_CXX)$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ $< $(helpers) $(LDFLAGS)
+	$(QUIET_CXX)$(CXX) \
+	$(patsubst -Wmissing-prototypes,,$(CPPFLAGS)) \
+	$(patsubst -Wmissing-prototypes,,$(CXXFLAGS)) \
+	-o $@ $< $(helpers) $(LDFLAGS)
 
 
 install: $(test_targets) runtests.sh runtests-loop.sh
-- 
Ammar Faizi