[Buildroot] [PATCH 1/1] package/boinc: fix build with autoconf >= 2.70

Fix the following build failure raised since bump of autoconf to version
2.71 in commit ecd54b65c1f998a7ccd91f7c523e4ff38c4781da and
http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commit;h=ec90049dfcf4538750e61d675d885157fa5ca7f8:

checking for /home/buildroot/autobuild/instance-0/output-1/host/bin/mips-linux-gnu-gcc options needed to detect all undeclared functions... cannot detect
configure: error: in `/home/buildroot/autobuild/instance-0/output-1/build/boinc-7.16.18':
configure: error: cannot make /home/buildroot/autobuild/instance-0/output-1/host/bin/mips-linux-gnu-gcc report undeclared builtins

This error raised because AC_CHECK_DECLS returns an error due to -mavx
flag:

mips-linux-gnu-gcc: error: unrecognized command line option '-mavx'

To fix this build failure, hard code ac_cv_c_undeclared_builtin_options
to 'none needed' as removing '-mavx' from CPPFLAGS will hinder the
detection of xgetbv, xgetbv, __xgetbv, cpuid, _cpuid and __cpuid

Fixes:
 - http://autobuild.buildroot.org/results/4b468a5d3bfbff9638316ca930ef791867774aef

Signed-off-by: Fabrice Fontaine <redacted>
---
 package/boinc/boinc.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/boinc/boinc.mk b/package/boinc/boinc.mk
index 079b065efd..317cad55b4 100644
--- a/package/boinc/boinc.mk
+++ b/package/boinc/boinc.mk

@@ -14,7 +14,9 @@ BOINC_CPE_ID_VENDOR = rom_walton
 BOINC_SELINUX_MODULES = boinc
 BOINC_DEPENDENCIES = host-pkgconf libcurl openssl
 BOINC_AUTORECONF = YES
-BOINC_CONF_ENV = ac_cv_path__libcurl_config=$(STAGING_DIR)/usr/bin/curl-config
+BOINC_CONF_ENV = \
+	ac_cv_c_undeclared_builtin_options='none needed' \
+	ac_cv_path__libcurl_config=$(STAGING_DIR)/usr/bin/curl-config
 BOINC_CONF_OPTS = \
 	--disable-apps \
 	--disable-boinczip \

-- 
2.33.0

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Hello Fabrice,

On Thu,  7 Oct 2021 18:41:12 +0200
Fabrice Fontaine [off-list ref] wrote:

Fix the following build failure raised since bump of autoconf to version
2.71 in commit ecd54b65c1f998a7ccd91f7c523e4ff38c4781da and
http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commit;h=ec90049dfcf4538750e61d675d885157fa5ca7f8:

checking for /home/buildroot/autobuild/instance-0/output-1/host/bin/mips-linux-gnu-gcc options needed to detect all undeclared functions... cannot detect
configure: error: in `/home/buildroot/autobuild/instance-0/output-1/build/boinc-7.16.18':
configure: error: cannot make /home/buildroot/autobuild/instance-0/output-1/host/bin/mips-linux-gnu-gcc report undeclared builtins

This error raised because AC_CHECK_DECLS returns an error due to -mavx
flag:

mips-linux-gnu-gcc: error: unrecognized command line option '-mavx'

To fix this build failure, hard code ac_cv_c_undeclared_builtin_options
to 'none needed' as removing '-mavx' from CPPFLAGS will hinder the
detection of xgetbv, xgetbv, __xgetbv, cpuid, _cpuid and __cpuid

Fixes:
 - http://autobuild.buildroot.org/results/4b468a5d3bfbff9638316ca930ef791867774aef

Signed-off-by: Fabrice Fontaine <redacted>

Wow, this was messy, and took me a while to understand. I've even added
a comment in the .mk file itself to explain what's going on.

There is a bug open in upstream Boinc on Github to track this issue,
and they acknowledge that they shouldn't unconditionally pass -mavx,
which really is the root of the problem.

Anyway, in the mean time, I have applied your patch, with an additional
comment, as said above.

Thanks for the good investigation on this one!

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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