[LEDE-DEV] Can't build gcc (initial) on Ubuntu 16.04

[Hauke Mehrtens]

On 03/03/2017 09:12 PM, Philip Prindeville wrote:
> I dug into this… Problem was with CONFIG_EXTRA_OPTIMIZATION having “-fno-plt” in it.
> 
> This was being passed into the ‘gcc’ that was being used to bootstrap gcc.
> 
> Wondering if that’s not a bug.
> 
> Shouldn’t the build of the cross-gcc ignore target flags?
> 
> 
>> On Mar 2, 2017, at 11:58 PM, Philip Prindeville <philipp_subx at redfish-solutions.com> wrote:
>>
>> Hi.
>>
>> I was trying to build LEDE (HEAD) today after rebasing all of my fixes to it (from OpenWRT), but I couldn’t even get gcc to build.  This was on Ubuntu 16.04-2 LTS.
>>
>> Is there a dependency that might have creeped in?
>>
>> I’m seeing the following:
>>
>> …
>> Checking multilib configuration for libgcc...
>> mkdir -p -- x86_64-openwrt-linux-musl/libgcc
>> Configuring in x86_64-openwrt-linux-musl/libgcc
>> configure: creating cache ./config.cache
>> checking build system type... x86_64-pc-linux-gnu
>> checking host system type... x86_64-openwrt-linux-musl
>> checking for --enable-version-specific-runtime-libs... no
>> checking for a BSD-compatible install... /usr/bin/install -c
>> checking for gawk... gawk
>> checking for x86_64-openwrt-linux-musl-ar... /home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/x86_64-openwrt-linux-musl/bin/ar
>> checking for x86_64-openwrt-linux-musl-lipo... x86_64-openwrt-linux-musl-lipo
>> checking for x86_64-openwrt-linux-musl-nm... /home/philipp/bertram/lede/build_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/gcc-5.3.0-initial/./gcc/nm
>> checking for x86_64-openwrt-linux-musl-ranlib... /home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/x86_64-openwrt-linux-musl/bin/ranlib
>> checking for x86_64-openwrt-linux-musl-strip... /home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/x86_64-openwrt-linux-musl/bin/strip
>> checking whether ln -s works... yes
>> checking for x86_64-openwrt-linux-musl-gcc...  /home/philipp/bertram/lede/build_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/gcc-5.3.0-initial/./gcc/xgcc -B/home/philipp/bertram/lede/build_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/gcc-5.3.0-initial/./gcc/ -B/home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/x86_64-openwrt-linux-musl/bin/ -B/home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/x86_64-openwrt-linux-musl/lib/ -isystem /home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/x86_64-openwrt-linux-musl/include -isystem /home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/x86_64-openwrt-linux-musl/sys-include   
>> checking for suffix of object files... configure: error: in `/home/philipp/bertram/lede/build_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/gcc-5.3.0-initial/x86_64-openwrt-linux-musl/libgcc':
>> configure: error: cannot compute suffix of object files: cannot compile
>> See `config.log' for more details.
>> Makefile:10905: recipe for target 'configure-target-libgcc' failed
>> make[4]: *** [configure-target-libgcc] Error 1
>> make[4]: Leaving directory '/home/philipp/bertram/lede/build_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/gcc-5.3.0-initial'
>> Makefile:36: recipe for target '/home/philipp/bertram/lede/build_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/gcc-5.3.0-initial/.built' failed
>> make[3]: *** [/home/philipp/bertram/lede/build_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/gcc-5.3.0-initial/.built] Error 2
>> make[3]: Leaving directory '/home/philipp/bertram/lede/toolchain/gcc/initial'
>> toolchain/Makefile:96: recipe for target 'toolchain/gcc/initial/compile' failed
>> make[2]: *** [toolchain/gcc/initial/compile] Error 2
>> make[2]: Leaving directory '/home/philipp/bertram/lede'
>> toolchain/Makefile:94: recipe for target '/home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/stamp/.toolchain_compile' failed
>> make[1]: *** [/home/philipp/bertram/lede/staging_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/stamp/.toolchain_compile] Error 2
>> make[1]: Leaving directory '/home/philipp/bertram/lede'
>> /home/philipp/bertram/lede/include/toplevel.mk:199: recipe for target 'world' failed
>> make: *** [world] Error 2
>>
>>
>>
>> The failing configure script was:
>>
>> build_dir/toolchain-x86_64_westmere_gcc-5.3.0_musl/gcc-5.3.0/libgcc/configure
>>
>> around line 3695.
>>
>> Am I missing something?  Is there a library or utility that has an unexpressed dependency?
>>
>> Thanks.
>>
>> -Philip

GCC 5.3.0 was replaced by GCC 5.4.0 in LEDE some months ago. What are
you using?

Hauke