How to generate line number debug information only?

[Martin Richtarsky <s at martinien dot de>]

Hi,

I would like to improve the build speed of a large project. The opt 
build is compiled with -O2 -g. I noticed that without -g, compilation 
becomes faster, about 10-20%. The resulting binary has enough 
information to analyze crashes, except for the line numbers. Is there a 
way to include line number information but nothing else?

According to [1], line numbers are produced only at level 2 (i.e. -g2 
or the default of -g) or above. But according to [2], line numbers are 
only a fraction of the debug information (1%). So for me it would be 
best to have -g0 or -g1 but with line numbers. Is this possible?

[1] http://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html
[2] http://gcc.gnu.org/wiki/DebugFission

Best regards,
Martin Richtarsky