when running gdb I cannot find crti.S

[Alex McMurchy]

It was something I'd done!


On 28th December 2013, in a separate post,I reported this -

> It seems I may have became a victim of a regression in gcc
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58864 which helped me with this
> statement -
> 
> "it breaks with -march=i686 but works with -march=i586."
> 
> I then noticed I hadn't set these flags -
> 
> export LDFLAGS=""
> export CXXFLAGS="-march=i486 -mtune=i486"
> export CFLAGS="-march=i486 -mtune=i486"
> 
> Once I'd set the flags the compile went through to a successful conclusion


Well though the compile went through successfully I hadn't noticed that that my export of CFLAGS seems to have overwritten the autogen.sh generated CFLAGS.


So I've managed to replace 

-O0 -gddb2

with 

-march=i486 -mtune=i486

I've fixed the problem, temporarily, by hacking config_host.mk

diff config_host.mk.bak config_host.mk
77c77
< export CXX=/usr/bin/ccache g++
---
> export CXX=/usr/bin/ccache g++ -ggdb2


So my way forward is to decide which of the following options to go for 
     *  remove my externally set flags to see whether my original problem has gone away
     *  to see whether I can supply compiler flags external to autogen.sh without overiding the compiler flags generated by autogen .sh.
     *  I could go back to GCC version 4.7 series
     *  try the latest from git as bug 58864 was fixed on 3rd December 2013.
or maybe there's something I hadn't thought of?

Though it does seem a bit bizarre that setting up CFLAG external to autogen.sh can overwrite the internally generated CFLAG, i'd have thought it should have concatenated the two - is this a bug?


Alex




On Friday 10 Jan 2014 08:43:49 Stephan Bergmann wrote:
> On 01/09/2014 11:50 AM, Alex McMurchy wrote:
> > All this seems to suggest that I haven't compiled correctly to get the
> > best out of gdb. I've only ever used --enable-dbgutil flag and compiled with
> 
> Yes, looks like missing debug information, but --enable-dbgutil should 
> provide that.  No idea what's going wrong for you.
> 
> Stephan
> 
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