[gcc r14-6273] testsuite: refine gcc.dg/analyzer/fd-4.c test for newlib

[Marc Poulhi?s]

https://gcc.gnu.org/g:45eb2c703c02fa2a5467efcdfb27692df37e4d75

commit r14-6273-g45eb2c703c02fa2a5467efcdfb27692df37e4d75
Author: Marc Poulhiès <poulhies@adacore.com>
Date:   Mon Nov 6 12:01:17 2023 +0100

    testsuite: refine gcc.dg/analyzer/fd-4.c test for newlib
    
    Contrary to glibc, including stdio.h from newlib defines mode_t which
    conflicts with the test's type definition.
    
    .../gcc/testsuite/gcc.dg/analyzer/fd-4.c:19:3: error: redefinition of typedef 'mode_t' with different type
    ...
    .../include/sys/types.h:189:25: note: previous declaration of 'mode_t' with type 'mode_t' {aka 'unsigned int'}
    
    Defining _MODE_T_DECLARED skips the type definition.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/analyzer/fd-4.c: Fix for newlib.

Diff:
---
 gcc/testsuite/gcc.dg/analyzer/fd-4.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/testsuite/gcc.dg/analyzer/fd-4.c b/gcc/testsuite/gcc.dg/analyzer/fd-4.c
index 3a961e4f813..880de3d7896 100644
--- a/gcc/testsuite/gcc.dg/analyzer/fd-4.c
+++ b/gcc/testsuite/gcc.dg/analyzer/fd-4.c
@@ -1,3 +1,4 @@
+/* { dg-additional-options "-D_MODE_T_DECLARED=1" { target newlib } } */
 #if defined(_AIX) || defined(__hpux)
 #define _MODE_T
 #endif