This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: building gcc with macro support for gdb?


On 3 December 2015 at 16:01, Martin Sebor wrote:
> On 12/02/2015 06:48 PM, Peter Bergner wrote:
>>
>> On Wed, 2015-12-02 at 20:05 -0500, Ryan Burn wrote:
>>>
>>> Is there any way to easily build a stage1 gcc with macro support for
>>> debugging?
>>>
>>> I tried setting CFLAGS, and CXXFLAGS to specify "-O0 -g3" via the
>>> command line before running configure, but that only includes those
>>> flags for some of the compilation steps.
>>>
>>> I was only successful after I manually edited the makefile to replace
>>> "-g" with "-g3".
>>
>>
>> Try CFLAGS_FOR_TARGET='-O0 -g3 -fno-inline' and CXXFLAGS_FOR_TARGET='-O0
>> -g3 -fno-inline'
>
>
> I've been using STAGE1_CFLAGS as Andreas suggested.  The tree
> checks in GCC make heavy use of macros that GDB unfortunately
> often has trouble with.  See GDB bugs 19111, 1888, and 18881
> for some of the problems.  To get around these, I end up using
> info macro to print the macro definition and using whatever it
> expands to instead.  I wonder if someone has found a more
> convenient workaround.

GDB's python printers might be useful here, but someone would have to
do the work of re-defining the macros in python, and maybe keeping
them up to date with changes to the macros.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]