Hi,
Using update-alternatives to set clang++ was a success, and export 
CC=/usr/bin/clang does the job (trying two differents methods). Debian project 
recommended to use export (CC,CCX) for versioning and only update-alternatives 
for alternative as it says.Anyway compilation with clang was as quick as gcc 
can do.
/usr/local/squid/sbin# ./squid -v
Squid Cache: Version 4.5
Service Name: squid

This binary uses OpenSSL 1.1.1a  20 Nov 2018. For legal restrictions on 
distribution see https://www.openssl.org/source/license.html

configure options:  '--enable-ssl' '--enable-ssl-crtd' '--localstatedir=/var' 
'--datadir=/usr/share/squid' '--sysconfdir=/etc/squid' 
'--libexecdir=/usr/lib/squid' '--mandir=/usr/share/man' '--enable-inline' 
'--disable-arch-native' '--enable-async-io=8' 
'--enable-storeio=ufs,aufs,diskd,rock' '--enable-removal-policies=lru,heap' 
'--enable-delay-pools' '--enable-cache-digests' '--enable-icap-client' 
'--enable-follow-x-forwarded-for' 
'--enable-auth-basic=DB,fake,getpwnam,LDAP,NCSA,NIS,PAM,POP3,RADIUS,SASL,SMB' 
'--enable-auth-digest=file,LDAP' '--enable-auth-negotiate=kerberos,wrapper' 
'--enable-auth-ntlm=fake,SMB_LM' 
'--enable-external-acl-helpers=file_userip,kerberos_ldap_group,LDAP_group,session,SQL_session,time_quota,unix_group,wbinfo_group'
 '--enable-security-cert-validators=fake' 
'--enable-storeid-rewrite-helpers=file' '--enable-url-rewrite-helpers=fake' 
'--enable-eui' '--enable-esi' '--enable-icmp' '--enable-zph-qos' 
'--enable-ecap' '--disable-translation' '--with-swapdir=/var/spool/squid' 
'--with-logdir=/var/log/squid' '--with-pidfile=/var/run/squid.pid' 
'--with-filedescriptors=65536' '--with-large-files' '--with-default-user=proxy' 
'--with-gnutls' '--with-openssl' 'CC=/usr/bin/clang'



>Seconded. With both my Squid Project and Debian pkg-squid Team hat's on
>I'd like to know why you feel any need to force the compiler?
There were errors to patch with memcpy because of the gcc version  8.2.0-14 
Debian wich considers some warnings as errors, besides some targets are BSD's.
smblib-util.c: In function ‘SMB_Negotiate’:
smblib-util.c:404:9: error: ‘strncpy’ output may be truncated copying 79 bytes 
from a string of length 79 [-Werror=stringop-truncation]
         strncpy(p, Con_Handle -> Svr_PDom, sizeof(Con_Handle -> Svr_PDom) - 1);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
smblib-util.c:427:9: error: ‘strncpy’ output may be truncated copying 79 bytes 
from a string of length 79 [-Werror=stringop-truncation]
         strncpy(p, Con_Handle -> Svr_PDom, sizeof(Con_Handle -> Svr_PDom) - 1);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
smblib-util.c: In function ‘SMB_TreeConnect’:
smblib-util.c:541:5: error: ‘strncpy’ specified bound 129 equals destination 
size [-Werror=stringop-truncation]
     strncpy(tree -> path, path, sizeof(tree -> path));
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
smblib-util.c:542:5: error: ‘strncpy’ specified bound 20 equals destination 
size [-Werror=stringop-truncation]
     strncpy(tree -> device_type, device, sizeof(tree -> device_type));
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Although my heart bleeds to use a compiler not compliant with GPL on Debian.
Great to known you are on this package, I thought there was only Luigi 
Gangitano (lu...@debian.org) for ages...

Best regards.


    Le mercredi 23 janvier 2019 à 05:25:04 UTC+1, Amos Jeffries 
<squ...@treenet.co.nz> a écrit :  
 
 On 23/01/19 5:17 am, Alex Rousskov wrote:
> On 1/22/19 6:21 AM, graf huy wrote:
> 
>> The Makefile is modified so each line with gcc is replaced with clang
>> and each line of g++ replaced with clang++. But gcc is still used.
> 
> I am not sure you are doing that,

Seconded. With both my Squid Project and Debian pkg-squid Team hat's on
I'd like to know why you feel any need to force the compiler?


Amos
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