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Subject: Re: [nfs-utils RESENT PATCH 1/1] locktes/rpcgen: tweak how we
 override compiler settings
To:     Petr Vorel <petr.vorel@gmail.com>, linux-nfs@vger.kernel.org
Cc:     Mike Frysinger <vapier@gentoo.org>
References: <20200105120502.765426-1-petr.vorel@gmail.com>
From:   Steve Dickson <SteveD@RedHat.com>
Message-ID: <fb4dd073-856a-7807-eb71-f594e58732cb@RedHat.com>
Date:   Tue, 7 Jan 2020 14:20:19 -0500
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On 1/5/20 7:05 AM, Petr Vorel wrote:
> From: Mike Frysinger <vapier@gentoo.org>
> 
> Newer autotools will use both CFLAGS and <target>_CFLAGS when compiling
> the <target>.  Adding the build settings to the target-specific flags no
> longer works as a way to compile build-time tools.
> 
> Instead, clobber the global flags.  This triggers an automake warning,
> but the end result actually works (unlike the existing code).
> 
> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
> Reviewed-by: Petr Vorel <petr.vorel@gmail.com>
> Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
> ---
> Hi Steve,
> 
> this patch was sent by Mike in 2013 [1]. You had some objections about
> warnings it causes [2]. Although I understand it, I'd like it was merged,
> because it's needed (taken by distros: gentoo [3], buildroot [4]) and
> IMHO it cannot be implemented other way.
> 
> Also not sure, what should be changed in automake to avoid this tweek
> (I might ask upstream).
> 
> Kind regards,
> Petr
> 
> [1] https://marc.info/?l=linux-nfs&m=136416341629788&w=2
> [2] https://marc.info/?l=linux-nfs&m=136423027217638&w=2
> [3] https://gitweb.gentoo.org/repo/gentoo.git/tree/net-fs/nfs-utils/files/nfs-utils-1.2.8-cross-build.patch
> [4] https://git.busybox.net/buildroot/tree/package/nfs-utils/0001-Patch-taken-from-Gentoo.patch
> 
Yes I do remember the conversation.... So you are saying using AM_XXXX macros 
like the following patch does not take care of the problem? 

diff --git a/tools/locktest/Makefile.am b/tools/locktest/Makefile.am
index 3156815..d5cf8da 100644
--- a/tools/locktest/Makefile.am
+++ b/tools/locktest/Makefile.am
@@ -1,12 +1,11 @@
 ## Process this file with automake to produce Makefile.in
 
 CC=$(CC_FOR_BUILD)
-LIBTOOL = @LIBTOOL@ --tag=CC
+AM_CFLAGS=$(CFLAGS_FOR_BUILD)
+AM_CPPFLAGS=$(CPPFLAGS_FOR_BUILD)
+AM_LDFLAGS=$(LDFLAGS_FOR_BUILD)
 
 noinst_PROGRAMS = testlk
 testlk_SOURCES = testlk.c
-testlk_CFLAGS=$(CFLAGS_FOR_BUILD)
-testlk_CPPFLAGS=$(CPPFLAGS_FOR_BUILD)
-testlk_LDFLAGS=$(LDFLAGS_FOR_BUILD)
 
 MAINTAINERCLEANFILES = Makefile.in
diff --git a/tools/rpcgen/Makefile.am b/tools/rpcgen/Makefile.am
index 8a9ec89..4ef7278 100644
--- a/tools/rpcgen/Makefile.am
+++ b/tools/rpcgen/Makefile.am
@@ -1,7 +1,9 @@
 ## Process this file with automake to produce Makefile.in
 
 CC=$(CC_FOR_BUILD)
-LIBTOOL = @LIBTOOL@ --tag=CC
+AM_CFLAGS=$(CFLAGS_FOR_BUILD) ${TIRPC_CFLAGS}
+AM_CPPFLAGS=$(CPPFLAGS_FOR_BUILD)
+AM_LDFLAGS=$(LDFLAGS_FOR_BUILD)
 
 noinst_PROGRAMS = rpcgen
 rpcgen_SOURCES = rpc_clntout.c rpc_cout.c rpc_hout.c rpc_main.c \