[PATCH 1/1] gdb, testsuite: Adapt gdb.base/callfuncs.exp for new clang warnings.

[Felix Willgerodt]

This patch fixes two issues with callfuncs.exp, which are both related
to new Clang warnings:

1) Clang 15.0.0 added a new warning for deprecated non-prototype functions:
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 for others to decide.

2) The other new warnings are about comparing a define with floats and doubles:

callfuncs.c:518:1: warning: floating-point comparison is always true; constant
cannot be represented exactly in type 'float' [-Wliteral-range]
DEF_FUNC_VALUES_3(fc, float, crealf, cimagf)

This can be fixed by making the define a float.
---
 gdb/testsuite/gdb.base/callfuncs.c   | 2 +-
 gdb/testsuite/gdb.base/callfuncs.exp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/gdb/testsuite/gdb.base/callfuncs.c b/gdb/testsuite/gdb.base/callfuncs.c
index d18d0dba073..cf7c75c1360 100644
--- a/gdb/testsuite/gdb.base/callfuncs.c
+++ b/gdb/testsuite/gdb.base/callfuncs.c
@@ -96,7 +96,7 @@ long double _Complex ldc3 = 3.0L + 3.0Li;
 long double _Complex ldc4 = 4.0L + 4.0Li;
 #endif /* TEST_COMPLEX */
 
-#define DELTA (0.001)
+#define DELTA (0.001f)
 
 char *string_val1 = (char *)"string 1";
 char *string_val2 = (char *)"string 2";
diff --git a/gdb/testsuite/gdb.base/callfuncs.exp b/gdb/testsuite/gdb.base/callfuncs.exp
index 4448cc127ba..d74357b8b48 100644
--- a/gdb/testsuite/gdb.base/callfuncs.exp
+++ b/gdb/testsuite/gdb.base/callfuncs.exp
@@ -18,7 +18,7 @@
 
 standard_testfile
 
-set compile_flags {debug}
+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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