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Newb build fails: -Werrors then Bootstrap comparison failure!
- From: will wray <wjwray at gmail dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Wed, 5 Sep 2018 16:14:34 -0400
- Subject: Newb build fails: -Werrors then Bootstrap comparison failure!
Following instructions here: https://gcc.gnu.org/install/index.html
on Fedora 28 with gcc (GCC) 8.1.1 20180712 (Red Hat 8.1.1-5).
First, the build hit a couple of -Werror fails so I reconfigured with
-disable-werror
then I get: Comparing stages 2 and 3, Bootstrap comparison failure!
Do I disable comparison? Disable bootstrap?
Any other suggestions on doing a fresh build?
> svn checkout svn://gcc.gnu.org/svn/gcc/trunk gcc
> mkdir build
> cd build
> mkdir gcc
> mkdir install
> cd gcc
> ../../gcc/configure --prefix=$HOME/repos/build/install
--enable-languages=c,c++ --disable-multilib
> make BOOT_CFLAGS='-O' bootstrap
...
./insn-opinit.h:358:40: error: ‘icode’ may be used uninitialized in this
function [-Werror=maybe-uninitialized]
358 | #define GEN_FCN(CODE) (insn_data[CODE].genfun)
...
../../../gcc/gcc/config/i386/i386.c:4514:32: error: ‘mask’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
4514 | opts->x_recip_mask_explicit |= mask;
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
cc1plus: all warnings being treated as errors
...
> make clean
> ../../gcc/configure --prefix=$HOME/repos/build/install
--enable-languages=c,c++ --disable-multilib -disable-werror
> make
...
Comparing stages 2 and 3
Bootstrap comparison failure!
gcc/gcc.o differs
gcc/plugin.o differs
...