~mcf/cproc#90: QBE Error: ssa temporary %.xxx is used undefined

While trying to build muon (https://github.com/muon-build/muon) with cproc I ran into an error when QBE is invoked. I'm not sure if this issue is a problem with cproc or QBE. Here are the steps to reproduce

git clone https://github.com/muon-build/muon
cd muon
mkdir build
cd build
cproc -DMUON_BOOTSTRAPPED -I . -I .. -I ../include -I subprojects/tinyjson -I ../subprojects/tinyjson -I src/script -DMUON_PLATFORM_posix -DMUON_ENDIAN=0 -o analyze.c.o -c ../src/lang/analyze.c

This produces the following error:

qbe:-:7102: ssa temporary %.294 is used undefined in @for_join.337
cproc: codegen: process 21147 exited with status 1
cproc: compile: process signaled: Terminated
cproc: assemble: process signaled: Terminated

Thanks!

Status: RESOLVED NOT_OUR_BUG
Submitter: ~zyedidia
Assigned to: No-one
Submitted: 3 months ago
Updated: a month ago
Labels: No labels applied.

~mcf REPORTED NOT_OUR_BUG a month ago

This error indicates that the code had some read of a variable before it was initialized. While I think qbe should accept this, it usually indicates some sort of bug in the code. Here, it was due to some unused variable warning suppressions (void)key, prior to their initialization.

This is fixed in muon 0.4.0.