guix: Re-evaluate fdebug-prefix-map #34414

1. 
   maflcko commented at 4:21 pm on January 26, 2026: member

   It could make sense to double check an re-evaluate if this is all right. Original comment follows:

   However, some source files are generated and reside in the build tree. So the mapping should be:

   0-HOST_CFLAGS+=" -fdebug-prefix-map=${DISTSRC}/src=."
   1+HOST_CFLAGS+=" -fdebug-prefix-map=${DISTSRC}=."
   

   Otherwise, paths become inconsistent and problematic for configuring source remapping in the debugger:

   0$ gdb ./bitcoin-fa37928536e0/libexec/bitcoin-node
   1(gdb) break IsRoutable
   2Breakpoint 1 at 0xb2aa40: file ./netaddress.cpp, line 463.
   3(gdb) break mp::ProxyClient<ipc::capnp::messages::Init>::construct
   4Breakpoint 2 at 0x5d82e0: file /distsrc-base/distsrc-fa37928536e0-x86_64-linux-gnu/build/src/ipc/capnp/init.capnp.proxy-client.c++, line 18.
   

   Originally posted by @hebasto in #34281 (review)

2. maflcko added the label Build system on Jan 26, 2026
3. 
   maflcko commented at 4:23 pm on January 26, 2026: member

   I haven’t tested this, but I think the issue exists since the cmake migration.

   Given that no one reported it, it seems low priority to fix, but it could still make sense to address, because the proposed fix looks simple enough.

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