'--append' kills my build performance

[Spongman]

I'm using bear --append and it's killing my build even when no compilation actually occurs (the project is already fully build). it works fine, it's just really slow.

without bear:

$ time make -sj7

real    0m3.750s
user    0m6.618s
sys     0m0.882s

with bear:

$ time ~/Bear/build/stage/bin/bear --append -- make -sj7

real    4m6.312s
user    0m32.840s
sys     0m16.986s

the project is a tree of makefiles running various shell/perl commands. again, no actual compilation is done here because the tree is fully built.

my compile_commands.events.json file is 8MB.

Environment:

• OS name: Linux

• OS version: CentOS Linux release 7.9.2009 (Core)

• OS architecture: x86_64

• Bear version: 3.1.2

• Bear install method: built from source

• What build tools this project is using? custom makefiles

• What architecture you are trying to compile for? same: x86_64

[rizsotto]

Thanks for the report. Will try to reproduce it.

In the meanwhile, if there is no secret in there, could you run Bear with verbose flag? That would already display some timing information to start with.