lang/rust*: Mk/Uses/cargo.mk: Move TMPDIR to WRKDIR

rustc stashes intermediary files in TMPDIR (default /tmp) which
might cause issues for users that for some reason space limit their
/tmp.  WRKDIR should have plenty of space.

Other ports that use rustc might be affected too, but set it only
in USES=cargo and lang/rust* ports for now.

PR:		258126
With hat:	rust

Mk/Uses/cargo.mk

@@ -125,6 +125,14 @@ CARGO_TEST?=	yes
 CARGO_USE_GITHUB?=	no
 CARGO_USE_GITLAB?=	no
 
+# rustc stashes intermediary files in TMPDIR (default /tmp) which
+# might cause issues for users that for some reason space limit
+# their /tmp.  WRKDIR should have plenty of space.
+# Allow users and ports to still overwrite it.
+.if ${TMPDIR:U/tmp} == /tmp
+TMPDIR=		${WRKDIR}
+.endif
+
 # Manage crate features.
 .if !empty(CARGO_FEATURES:M--no-default-features)
 CARGO_BUILD_ARGS+=	--no-default-features

lang/rust-bootstrap/Makefile

@@ -57,6 +57,11 @@ CC=		clang90
 CXX=		clang++90
 .endif
 PATCHDIR=	${.CURDIR}/../rust/files
+# rustc stashes intermediary files in TMPDIR (default /tmp) which
+# might cause issues for users that for some reason space limit
+# their /tmp.  WRKDIR should have plenty of space.
+# ?= to allow users to still overwrite it in make.conf.
+TMPDIR?=	${WRKDIR}
 # Resulting packages are not specific to amd64
 NO_ARCH=	yes
 

lang/rust/Makefile

@@ -44,6 +44,12 @@ TEST_ENV=	${MAKE_ENV} \
 
 CONFLICTS_INSTALL?=	rust-nightly
 
+# rustc stashes intermediary files in TMPDIR (default /tmp) which
+# might cause issues for users that for some reason space limit
+# their /tmp.  WRKDIR should have plenty of space.
+# ?= to allow users to still overwrite it in make.conf.
+TMPDIR?=	${WRKDIR}
+
 OPTIONS_DEFINE=		DOCS GDB SOURCES WASM
 OPTIONS_DEFAULT=	SOURCES WASM
 OPTIONS_EXCLUDE_armv6=	DOCS