Ping: [PATCH] jit: Ensure ssize_t is defined.

[Iain Sandoe <iain@sandoe.co.uk>]

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> On 29 Jan 2024, at 11:26, Iain Sandoe <iain@sandoe.co.uk> wrote:

> I guess the solution here depends on the scope over which we expect
> the header to be used.
> 
>> On 28 Jan 2024, at 23:13, Iain Sandoe <iain@sandoe.co.uk> wrote:
>>> On 28 Jan 2024, at 21:25, Eric Gallager <egall@gwmail.gwu.edu> wrote:
>>> On Sun, Jan 28, 2024 at 6:45 AM Iain Sandoe <iains.gcc@gmail.com> wrote:
>>>> 
>>>> Tested on i686, x86_64 Darwin, x86_64 Linux,
>>>> OK for trunk?
>>>> 
>>>> --- 8< ---
>>>> 
>>>> On some targets it seems that ssize_t is not defined by any of the
>>>> headers transitively included by <stdio.h>.  This leads to a bootstrap
>>>> fail when jit is enabled.
>>>> 
>>>> The fix proposed here is to include sys/types.h when it is available
>>>> since that is where Posix specifies that ssize_t is defined.
>>>> 
>>>> gcc/jit/ChangeLog:
>>>> 
>>>>      * libgccjit.h: Conditionally include <sys/types.h> where it is
>>>>      available to ensure declaration of ssize_t.
>>>> 
>>>> Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
>>>> ---
>>>> gcc/jit/libgccjit.h | 3 +++
>>>> 1 file changed, 3 insertions(+)
>>>> 
>>>> diff --git a/gcc/jit/libgccjit.h b/gcc/jit/libgccjit.h
>>>> index 235cab053e0..db4f27a48bf 100644
>>>> --- a/gcc/jit/libgccjit.h
>>>> +++ b/gcc/jit/libgccjit.h
>>>> @@ -21,6 +21,9 @@ along with GCC; see the file COPYING3.  If not see
>>>> #define LIBGCCJIT_H
>>>> 
>>>> #include <stdio.h>
>>>> +#if __has_include(<sys/types.h>)
>>> 
>>> Is __has_include() something that we can use unconditionally?
>> 
>> Hmm.. maybe we cannot, it seems it was introduced in gcc-4.9 and we only ask
>> for 4.8, IIRC.
>> 
>> I guess HAVE_SYS_TYPES_H might be an alternative (I’ll have to retest)
> 
> Answering my own question; no that is not going to work  either since the header is
> installed and config.h is not.
> 
> I guess the question is “is this header ever [meaningfully] consumed by a compiler
> other than the current GCC that it supports”?
> 
> e.g. if we expected we could build libgccjit with clang in a “—disable-bootstrap”
> configuration and expect that to work?
> 

this … (as attached)

> The fallback is
> #ifdef __APPLE__
> # include <sys/types.h>  /* For ssize_t.  */
> #endif


> 
> (which I will test on a number of platform versions).
> 
> since this breaks bootstrap at stage 2 on affected platform versions, so we need some
> fix.


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From d289211d30457683df38b44449dccdb41c556b33 Mon Sep 17 00:00:00 2001
From: Iain Sandoe <iain@sandoe.co.uk>
Date: Sun, 21 Jan 2024 10:44:49 +0000
Subject: [PATCH] jit: Ensure ssize_t is defined.

One some targets it seems that ssize_t is not defined by any of the
headers transitively included by <stdio.h>.  This leads to a bootstrap
fail when jit is enabled.

The fix proposed here is to include sys/types.h when it is available
since that is where Posiz specifies that ssize_t is defined.

gcc/jit/ChangeLog:

	* libgccjit.h: Conditionally include <sys/types.h> on Darwin
	to ensure declaration of ssize_t.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
---
 gcc/jit/libgccjit.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/jit/libgccjit.h b/gcc/jit/libgccjit.h
index 74e847b2dec..58d282046e8 100644
--- a/gcc/jit/libgccjit.h
+++ b/gcc/jit/libgccjit.h
@@ -21,6 +21,9 @@ along with GCC; see the file COPYING3.  If not see
 #define LIBGCCJIT_H
 
 #include <stdio.h>
+#ifdef __APPLE__
+# include <sys/types.h>  /* For ssize_t.  */
+#endif
 
 #ifdef __cplusplus
 extern "C" {
-- 
2.39.2 (Apple Git-143)


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