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

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Message-ID: <YiYgPnn9wtXbOm0a@shredder>
Date:   Mon, 7 Mar 2022 17:09:50 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     David Ahern <dsahern@...nel.org>
Cc:     netdev@...r.kernel.org, stephen@...workplumber.org
Subject: Re: [PATCH iproute2-next] configure: Allow command line override of
 toolchain

On Sat, Mar 05, 2022 at 11:11:43AM -0700, David Ahern 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.

I realize it was already merged (wasn't asking for academic purposes),
but rather wanted you to verify that the patch is not needed on your end
so that I could revert it. I can build with gcc/clang even without the
patch. With the patch, the build is broken on Fedora as "yacc" is not a
build dependency [1]. Verified this with a clean install of Fedora 35:
Can't build iproute with this patch after running "dnf builddep
iproute". Builds fine without it.

[1] https://src.fedoraproject.org/rpms/iproute/blob/rawhide/f/iproute.spec#_22