python3: fix host PGO build failure on deep build paths

Python 3.14 made "forkserver" the default multiprocessing start method on
Linux, which binds an AF_UNIX socket under $TMPDIR during the PGO profile-run.
OpenWrt points TMPDIR at the deeply nested build tree, so the socket path can
exceed the 108-byte AF_UNIX limit and abort the host build with "AF_UNIX path
too long" in test_re (cpython#149527). Pin TMPDIR=/tmp for the host build.

Signed-off-by: Alexandru Ardelean <redacted>

diff --git a/lang/python/python3/Makefile b/lang/python/python3/Makefile
index e53b85fc1151f5c40e90a66c665f2bf9b70a5c30..1fbb2b6a7023c4000bd8ca4109be85ceacad34dc 100644 (file)
--- a/lang/python/python3/Makefile
+++ b/lang/python/python3/Makefile
@@ -287,6 +287,9 @@ Package/python3/install:=:
 ifeq ($(HOST_OS),Linux)
 HOST_LDFLAGS += \
        -Wl,--no-as-needed -lrt
+
+HOST_MAKE_VARS += \
+       TMPDIR=/tmp
 endif
 
 # Would be nice to be able to do this, but hosts are very fiddly