X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:to:from:subject:date:message-id:mime-version
	:content-type:content-transfer-encoding; q=dns; s=default; b=acP
	BdoI8zea+yM08u07kP13ESVwPBxsl3qkJfxyK7vmoG656G2R/U9Az/Ua+L/qkSy8
	JZYXKlgeV7WhdoX8ZFXMXAdYrS5Id1HRRFMy2nagyZU54JPCR/HI9KJiKKx+zfoq
	/2kp8XPDoH1tiOQONMd7vlhTFaam67amwONnNspM=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:to:from:subject:date:message-id:mime-version
	:content-type:content-transfer-encoding; s=default; bh=+aBsENlSP
	Q/Qiqv2NKdNDsBKLuw=; b=XMhec+JyId5osU5Wglym8osAuTEH9JsAmO8wQlA/k
	860b7gUUXpDldphb+XOL3p1WmXVk+wq9BVy9kr9VDMxO8wPOqSS2wZ51VKR1PNes
	YKIxjAEm2Ud5ZQyRR6rMRTRAxcH6nu7P0o2f5Bx0ak+eRUQeXqFd/J42vkWZ2B8P
	ho=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-2.4 required=5.0 tests=AWL,BAYES_05,RCVD_IN_DNSWL_LOW,RP_MATCHES_RCVD,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.2 spammy=ns, H*Ad:D*gov, 20160503, 2016-05-03
X-HELO:	plane.gmane.org
To:	cygwin AT cygwin DOT com
From:	Andrew Schulman <schulman DOT andrew AT epa DOT gov>
Subject:	lftp 4.7.2 build fails in Cygwin
Date:	Thu, 26 May 2016 13:20:42 -0400
Lines:	94
Message-ID:	<v2bekbhfa5mjbe3rasddujjrbh6bjauaff@4ax.com>
Mime-Version:	1.0
X-Archive:	encrypt
X-IsSubscribed:	yes

Cygwin 2.5.1 x86_64
g++ 5.3.0

In Cygwin, build of lftp 4.7.2 fails in two places:

(1)

/home/andrex/dev/cygwin/lftp/lftp-4.7.2-1.x86_64/src/lftp-4.7.2/src/xmalloc.h:31:38:
error: expected ';', ',' or ')' before '=' token
 char *xstrdup(const char *s,int spare=0);
                                      ^

g++ seems not to like the default value 'spare=0' in the function declaration.
The function definition (in xmalloc.cc) doesn't include the default value:

char *xstrdup(const char *s,int spare)
{
   if(!s)
      return (char*)xmalloc(spare);
#ifdef MEM_DEBUG
   printf("xstrdup \"%s\"\n",s);
#endif
   size_t len=strlen(s)+1;
   char *mem=(char*)xmalloc(len+spare);
   memcpy(mem,s,len);
   return mem;
}

I tried removing the default value from the declaration in xmalloc.h, or adding
it into the definition in xmalloc.cc.  But the build still failed either way.

Finally I just removed the 'spare' parameter from the function, since a look
through the source code shows that it's never used.  The patch for that is
below.  

But I don't know why Cygwin's g++ (5.3.0) chokes on this. The same construction
was present in 4.6.5, which compiled fine in Cygwin.

(2)

/home/andrex/dev/cygwin/lftp/lftp-4.7.2-1.x86_64/src/lftp-4.7.2/src/xmalloc.h:32:21:
error: expected ';', ',' or ')' before '&' token
 char *xstrset(char *&mem,const char *s);
                     ^
/home/andrex/dev/cygwin/lftp/lftp-4.7.2-1.x86_64/src/lftp-4.7.2/src/xmalloc.h:33:21:
error: expected ';', ',' or ')' before '&' token
 char *xstrset(char *&mem,const char *s,size_t n);
                     ^

Here g++ doesn't like *&mem. Again I don't know why g++ chokes on this, since
the same construction was present in 4.6.5, which compiled fine in Cygwin.

Does anyone know the right solution for these problems? Some compiler switches
I'm missing?

Thanks,
Andrew

===

diff -urN lftp-4.7.1.orig/src/xmalloc.cc lftp-4.7.1/src/xmalloc.cc
--- lftp-4.7.1.orig/src/xmalloc.cc  2015-11-25 05:27:17.000000000 -0500
+++ lftp-4.7.1/src/xmalloc.cc   2016-05-03 18:09:15.709557300 -0400
@@ -83,15 +83,15 @@
    free(p);
 }

-char *xstrdup(const char *s,int spare)
+char *xstrdup(const char *s)
 {
    if(!s)
-      return (char*)xmalloc(spare);
+     return 0;
 #ifdef MEM_DEBUG
    printf("xstrdup \"%s\"\n",s);
 #endif
    size_t len=strlen(s)+1;
-   char *mem=(char*)xmalloc(len+spare);
+   char *mem=(char*)xmalloc(len);
    memcpy(mem,s,len);
    return mem;
 }
diff -urN lftp-4.7.1.orig/src/xmalloc.h lftp-4.7.1/src/xmalloc.h
--- lftp-4.7.1.orig/src/xmalloc.h   2015-11-25 05:27:18.000000000 -0500
+++ lftp-4.7.1/src/xmalloc.h    2016-05-03 18:06:28.969612500 -0400
@@ -28,7 +28,7 @@

 void *xmalloc(size_t);
 void *xrealloc(void *,size_t);
-char *xstrdup(const char *s,int spare=0);
+char *xstrdup(const char *s);
 char *xstrset(char *&mem,const char *s);
 char *xstrset(char *&mem,const char *s,size_t n);
 #define alloca_strdup(s) alloca_strdup2((s),0)


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -