================
@@ -0,0 +1,18 @@
+// Check that clang invocation can spawn and handshake with module build daemon
+
+// REQUIRES: !system-windows
+
+// RUN: if pgrep -f "cc1modbuildd mbd-handshake"; then pkill -f "cc1modbuildd
mbd-handshake"; fi
+// RUN: rm -rf mbd-handshake %t
----------------
cpsughrue wrote:
Looks like the header file `un.h`, provided by
glibc-headers-2.34-60.el9.x86_64, sets the max unix socket address length to
108 characters.
```cpp
// /usr/include/sys/un.h
/* Structure describing the address of an AF_LOCAL (aka AF_UNIX) socket. */
struct sockaddr_un
{
__SOCKADDR_COMMON (sun_);
char sun_path[108]; /* Path name. */
};
```
`%t` results in a socket address of
`/home/cpsughrue/repos/llvm-project-fork/build/tools/clang/test/ModuleBuildDaemon/Output/handshake.c.tmp/mbd.sock`
which is 112 characters. So, in this case, the clang invocation looks to
communicate over `mbd.sock` under
`/home/cpsughrue/repos/llvm-project-fork/build/tools/clang/test/ModuleBuildDaemon/Output/handshake.c.tmp`
but the daemon chops off `.sock` and creates the address `mbd`.
I can shorten the file name to `hand.c` or use
`-fmodule-build-daemon=handshake-mbd` which places the socket file at
`llvm-project/build/tools/clang/test/ModuleBuildDaemon/handshake-mbd/mbd.sock`.
Any preference?
https://github.com/llvm/llvm-project/pull/67562
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