netdev - Re: [PATCH iproute2-next] configure: Allow command line override of toolchain

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Date:   Sat, 5 Mar 2022 11:32:35 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     David Ahern <dsahern@...nel.org>
Cc:     Ido Schimmel <idosch@...sch.org>, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next] configure: Allow command line override of
 toolchain

On Sat, 5 Mar 2022 11:11:43 -0700
David Ahern <dsahern@...nel.org> wrote:

> On 3/2/22 6:56 AM, Ido Schimmel wrote:
> > David, are you sure this patch is needed? Even without it I can override
> > from the command line:
> > 
> > $ make V=1 CC=gcc
> > 
> > lib
> > make[1]: Entering directory '/home/idosch/code/iproute2/lib'
> > gcc -Wall -Wstrict-prototypes  -Wmissing-prototypes -Wmissing-declarations -Wold-style-definition -Wformat=2 -O2 -pipe -I../include -I../include/uapi -DRESOLVE_HOSTNAMES -DLIBDIR=\"/usr/lib\" -DCONFDIR=\"/etc/iproute2\" -DNETNS_RUN_DIR=\"/var/run/netns\" -DNETNS_ETC_DIR=\"/etc/netns\" -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -DHAVE_SETNS -DHAVE_HANDLE_AT -DHAVE_SELINUX -DHAVE_ELF -DHAVE_LIBMNL -DNEED_STRLCPY -DHAVE_LIBCAP -DHAVE_SETNS -DHAVE_HANDLE_AT -DHAVE_SELINUX -DHAVE_ELF -DHAVE_LIBMNL -DNEED_STRLCPY -DHAVE_LIBCAP -fPIC   -c -o libgenl.o libgenl.c
> > ...
> > 
> > $ make V=1 CC=clang
> > 
> > lib
> > make[1]: Entering directory '/home/idosch/code/iproute2/lib'
> > clang -Wall -Wstrict-prototypes  -Wmissing-prototypes -Wmissing-declarations -Wold-style-definition -Wformat=2 -O2 -pipe -I../include -I../include/uapi -DRESOLVE_HOSTNAMES -DLIBDIR=\"/usr/lib\" -DCONFDIR=\"/etc/iproute2\" -DNETNS_RUN_DIR=\"/var/run/netns\" -DNETNS_ETC_DIR=\"/etc/netns\" -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -DHAVE_SETNS -DHAVE_HANDLE_AT -DHAVE_SELINUX -DHAVE_ELF -DHAVE_LIBMNL -DNEED_STRLCPY -DHAVE_LIBCAP -DHAVE_SETNS -DHAVE_HANDLE_AT -DHAVE_SELINUX -DHAVE_ELF -DHAVE_LIBMNL -DNEED_STRLCPY -DHAVE_LIBCAP -fPIC   -c -o libgenl.o libgenl.c
> >   
> 
> interesting. As I recall the change was needed when I was testing
> Stephen's patches for a clean compile with clang. Either way, the patch
> was already merged.
> 

Right, it maybe necessary for configure. I was using clang after already having done
configure step on my system (with gcc).