-fsanitize-blacklist does not work correctly with relative paths

[luca020400]

I'm trying to replace ccache with sccache in the AOSP build system but I'm facing a few errors
This is the first issue that stems from using the -c flag of clang enabling the use of the integrated clang assembler

cat foo.cpp              
#include <stdlib.h>
void bad_foo() {
  int *a = (int*)malloc(40);
  a[10] = 1;
}
int main() { bad_foo(); }

cat blacklist.txt 
# Ignore reports from bad_foo function.
fun:bad_foo

sccache clang++ -c -fsanitize=address -fsanitize-blacklist=blacklist.txt foo.cpp
sccache: encountered fatal error
sccache: error : Failed to open file for hashing: "blacklist.txt"
sccache:  cause: Failed to open file for hashing: "blacklist.txt"
sccache:  cause: No such file or directory (os error 2)

The same command without -c works properly

sccache clang++ -fsanitize=address -fsanitize-blacklist=blacklist.txt foo.cpp

[froydnj]

Are you attempting to use sccache-dist?

[luca020400]

I'm using sccache as a local cache, if that's what you're asking

[froydnj]

That wasn't, but I think your answer tells me what I need to know. The temporary workaround is to pass an absolute path for -fsanitize-blacklist=.