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From: Tatsuo Ishii <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Compiling issues for 32-bit targets
Date: Wed, 17 Sep 2025 19:47:36 +0900 (JST)
Message-ID: <[email protected]> (raw)

Gyorgy Sarvari <[email protected]> pointed out that snprintf.c has
issues when compiled on 32-bit targets:
https://github.com/pgpool/pgpool2/pull/128

> the compiler was complaining about undefined isnan and ininf functions in
> snprintf.c file

(Moreover he pointed out another issue. will discuss later on)

> When building for 32-bit arm arch, compilation fails with the following error:
> | snprintf.c: In function 'fmtfloat':
> | snprintf.c:1232:13: error: implicit declaration of function 'isnan' [-Wimplicit-function-declaration]
> |  1232 |         if (isnan(value))
> |       |             ^~~~~
> | snprintf.c:50:1: note: include '<math.h>' or provide a declaration of 'isnan'
> |    49 | #include "postgresql/server/port.h"
> |   +++ |+#include <math.h>
> |    50 |
> | snprintf.c:1254:21: error: implicit declaration of function 'isinf' [-Wimplicit-function-declaration]
> |  1254 |                 if (isinf(value))
> |       |                     ^~~~~
> | snprintf.c:1254:21: note: include '<math.h>' or provide a declaration of 'isinf'
> 
> To avoid the error, add math.h to snprintf.c.

I think his idea is good. snprintf.c was imported from PostgreSQL long
time ago. If we look into the original file (src/port/snprintf.c) it
actually has "#include <math.h>" already.

If there's no objection, I will push attached patch to all supported
branches. It not only adds math.h, but remove ancient ruin "#if 0" and
sort out the order of including files.

Best regards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp


Attachments:

  [text/x-patch] snprintf.patch (826B, 2-snprintf.patch)
  download | inline diff:
diff --git a/src/parser/snprintf.c b/src/parser/snprintf.c
index c3564935e..ec0355205 100644
--- a/src/parser/snprintf.c
+++ b/src/parser/snprintf.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003-2024, PgPool Global Development Group
+ * Copyright (c) 2003-2025, PgPool Global Development Group
  * Copyright (c) 1983, 1995, 1996 Eric P. Allman
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -32,17 +32,14 @@
  * src/port/snprintf.c
  */
 
-#if 0
-#include "c.h"
-#endif
-
+#include <ctype.h>
+#include <errno.h>
+#include <math.h>
 #include <stdarg.h>
-#include <stdio.h>
 #include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <ctype.h>
-#include <errno.h>
 #include "pool_parser.h"
 #include "stringinfo.h"
 #include "utils/palloc.h"

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