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bug#27668: 26.0.50; Crash with display-line-numbers t


From: Robert Pluim
Subject: bug#27668: 26.0.50; Crash with display-line-numbers t
Date: Fri, 14 Jul 2017 17:07:17 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

Robert Pluim <address@hidden> writes:

> Eli Zaretskii <address@hidden> writes:
>
>>> From: Robert Pluim <address@hidden>
>>> Would you like me to try an unoptimised build? CFLAGS=-O0 -ggdb or
>>> similar?
>>
>> It cannot hurt, so please do.  Maybe this will give some valuable
>> hints.  (Please use "-gdwarf-4 -g3" instead of -ggdb, it should
>> provide a better debug info.)  Btw, I already did an optimized build,
>> but was unable to reproduce the problem there as well.
>>
>
> I'll try that next, I think you're on the right track.
>

Two more data points:

- building with CFLAGS='-gdwarf-4 -g3 -O0' results in an emacs that I
can't get to crash
- building with default CFLAGS='-g3 -O2', but using the previous
system compiler also results in an emacs that I can't crash. That one
reports:

$ gcc-4.9 -v
Using built-in specs.
COLLECT_GCC=gcc-4.9
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.9.3-13ubuntu2' 
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs 
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr 
--program-suffix=-4.9 --enable-shared --enable-linker-build-id 
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix 
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls 
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug 
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify 
--enable-plugin --with-system-zlib --disable-browser-plugin 
--enable-java-awt=gtk --enable-gtk-cairo 
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64/jre --enable-java-home 
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64 
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64 
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar 
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib 
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu 
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.9.3 (Ubuntu 4.9.3-13ubuntu2) 

Regards

Robert






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