[PATCH v3 2/2] gdb, testsuite: Adapt gdb.base/callfuncs.exp for new clang warning.

[Felix Willgerodt <felix.willgerodt@intel.com>]

Clang 15.0.0 enabled the warning for deprecated non-prototype functions
by default: https://reviews.llvm.org/D122895
Callfuncs.exp is impacted and won't run due to new warnings:

callfuncs.c:339:5: warning: a function declaration without a prototype is
deprecated in all versions of C and is not supported in C2x
[-Wdeprecated-non-prototype]
int t_float_values (float_arg1, float_arg2)

This patch disables those warnings with -Wno-deprecated-non-prototype.
Removing the test for deprecated syntax would also be an option. But I will
leave that up for others to decide/implement.
---
 gdb/testsuite/gdb.base/callfuncs.exp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/callfuncs.exp b/gdb/testsuite/gdb.base/callfuncs.exp
index 4448cc127ba..fd63f109101 100644
--- a/gdb/testsuite/gdb.base/callfuncs.exp
+++ b/gdb/testsuite/gdb.base/callfuncs.exp
@@ -18,7 +18,9 @@
 
 standard_testfile
 
-set compile_flags {debug}
+# We still want to test non-prototype functions for now, which is why
+# we disable compilers warning about them.
+set compile_flags {debug additional_flags=-Wno-deprecated-non-prototype}
 if [support_complex_tests] {
     lappend compile_flags "additional_flags=-DTEST_COMPLEX"
 }
-- 
2.34.3

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