[COMMITTED] ada: Spurious warning about negative modular literal

["Marc Poulhiès" <poulhies@adacore.com>]

From: Steve Baird <baird@adacore.com>

If -gnatw.m is enabled, the compiler generates a warning if a unary
minus operator of a modular type is applied to an integer literal.
This warning was being incorrectly generated in some cases where no integer
literal is present in the source code.

gcc/ada/

	* sem_res.adb (Resolve_Unary_Op): In deciding whether to emit a
	warning about a modular type's unary minus operator being applied
	to an integer literal, ignore integer literals for which
	Comes_From_Source is False.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/sem_res.adb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/ada/sem_res.adb b/gcc/ada/sem_res.adb
index 9755e4d14a6..c708d04fc32 100644
--- a/gcc/ada/sem_res.adb
+++ b/gcc/ada/sem_res.adb
@@ -12671,6 +12671,7 @@ package body Sem_Res is
       if Warn_On_Suspicious_Modulus_Value
         and then Nkind (N) = N_Op_Minus
         and then Nkind (R) = N_Integer_Literal
+        and then Comes_From_Source (R)
         and then Is_Modular_Integer_Type (B_Typ)
         and then Nkind (Parent (N)) not in N_Qualified_Expression
                                          | N_Type_Conversion
-- 
2.40.0