[binutils-gdb] [gdb/build] Fix build on postmarketos

[Tom de Vries <vries@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=97e9c24c38513a69db81fe4c8206785c3a7050af

commit 97e9c24c38513a69db81fe4c8206785c3a7050af
Author: Tom de Vries <tdevries@suse.de>
Date:   Thu Mar 14 21:28:44 2024 +0100

    [gdb/build] Fix build on postmarketos
    
    I tried building gdbserver on postmarketos (which is based on alpine linux,
    which uses musl libc), and ran into:
    ...
    gdbserver/linux-low.cc: In lambda function:
    gdbserver/linux-low.cc:1907:41: error: \
      'W_EXITCODE' was not declared in this scope
     1907 |               mark_lwp_dead (leader_lp, W_EXITCODE (0, 0), true);
          |                                         ^~~~~~~~~~
    ...
    
    The macro W_EXITCODE is not defined in gdbsupport/gdb_wait.h.
    
    OTOH, WSETEXIT is defined there, but unused:
    ...
     /* These are not defined in POSIX, but are used by our programs.  */
    
     #ifndef WSETEXIT
     # ifdef W_EXITCODE
     #define WSETEXIT(w,status) ((w) = W_EXITCODE(status,0))
     # else
     #define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
     # endif
     #endif
    ...
    
    Fix this by dropping the WSETEXIT definition, and instead defining W_EXITCODE.
    
    Tested on x86_64-linux, in combination with an "#undef W_EXITCODE" to make
    sure the definition is exercised.
    
    Approved-By: Tom Tromey <tom@tromey.com>
    
    PR build/31483
    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31483

Diff:
---
 gdbsupport/gdb_wait.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/gdbsupport/gdb_wait.h b/gdbsupport/gdb_wait.h
index e9e39584e6e..c6348dbcb1c 100644
--- a/gdbsupport/gdb_wait.h
+++ b/gdbsupport/gdb_wait.h
@@ -99,12 +99,8 @@ extern int windows_status_to_termsig (unsigned long);
 
 /* These are not defined in POSIX, but are used by our programs.  */
 
-#ifndef	WSETEXIT
-# ifdef	W_EXITCODE
-#define	WSETEXIT(w,status) ((w) = W_EXITCODE(status,0))
-# else
-#define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
-# endif
+#ifndef W_EXITCODE
+#define W_EXITCODE(status, sig) ((status) << 8 | (sig))
 #endif
 
 #ifndef W_STOPCODE