libcrypto regress: move GOCACHE to obj/

While it may be acceptable for Go to fill regular users' homedirs with a
compiler cache that is unable to deal with corruption and full disks,
this is terrible for people running regress as root since the cache can
quickly grow to hundreds of megs and can thus result in all sorts hilarity
below /root. Move the GOCACHE under ${.OBJDIR} and use a cleanup target to
get rid of it again. This makes these tests a bit slower for regular users
as well, but so be it. Let's see how this goes before I switch libtls to
the same model.

discussed with claudio and jsing

3 files changed, 28 insertions, 12 deletions

diff --git a/src/regress/lib/libcrypto/c2sp/Makefile b/src/regress/lib/libcrypto/c2sp/Makefile
index d16d06975b..062d83e99c 100644
--- a/src/regress/lib/libcrypto/c2sp/Makefile
+++ b/src/regress/lib/libcrypto/c2sp/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.5 2025/04/27 08:51:24 tb Exp $
+# $OpenBSD: Makefile,v 1.6 2025/07/09 05:04:35 tb Exp $
 
 C2SP_TESTVECTORS = /usr/local/share/c2sp-testvectors/
 
@@ -13,7 +13,7 @@ PROGS += cctv
 SRCS_cctv =
 
 cctv: cctv.go
-        go build -o $@ ${.CURDIR}/cctv.go
+        env GOCACHE=${.OBJDIR}/go-build go build -o $@ ${.CURDIR}/cctv.go
 
 OSSL_LIB =      /usr/local/lib/eopenssl
 OSSL_INC =      /usr/local/include/eopenssl
@@ -29,10 +29,17 @@ CGO_LDFLAGS_$V += 	-L${OSSL_LIB}$V
 
 cctv-openssl$V: cctv.go
         env CGO_CFLAGS="${CGO_CFLAGS_$V}" CGO_LDFLAGS="${CGO_LDFLAGS_$V}" \
+            GOCACHE=${.OBJDIR}/go-build \
             go build -o $@ ${.CURDIR}/cctv.go
 .  endif
 . endfor
 
+REGRESS_CLEANUP =       clean-go-cache
+
+clean-go-cache:
+        env GOCACHE=${.OBJDIR}/go-build go clean -cache
+        rm -rf ${.OBJDIR}/go-build
+
 .endif
 
 .include <bsd.regress.mk>
diff --git a/src/regress/lib/libcrypto/certs/Makefile b/src/regress/lib/libcrypto/certs/Makefile
index 621c60907f..f7ba9fcad8 100644
--- a/src/regress/lib/libcrypto/certs/Makefile
+++ b/src/regress/lib/libcrypto/certs/Makefile
@@ -1,21 +1,24 @@
-#       $OpenBSD: Makefile,v 1.1 2020/07/14 18:27:28 jsing Exp $
+#       $OpenBSD: Makefile,v 1.2 2025/07/09 05:04:35 tb Exp $
 
-.if ! (make(clean) || make(cleandir) || make(obj))
-GO_VERSION != sh -c "(go version) 2>/dev/null || true"
-.endif
-
-.if empty(GO_VERSION)
+.if !exists(/usr/local/bin/go)
 regress:
         @echo package go is required for this regress
         @echo SKIPPED
-.endif
+.else
 
 REGRESS_TARGETS=regress-go-verify
+REGRESS_CLEANUP=clean-go-cache
 
 certs:
         cd ${.CURDIR} && sh ./make-certs.sh
 
 regress-go-verify:
-        cd ${.CURDIR} && go test -test.v .
+        cd ${.CURDIR} && env GOCACHE=${.OBJDIR}/go-build go test -test.v .
+
+clean-go-cache:
+        env GOCACHE=${.OBJDIR}/go-build go clean -cache
+        rm -rf ${.OBJDIR}/go-build
+
+.endif
 
 .include <bsd.regress.mk>
diff --git a/src/regress/lib/libcrypto/wycheproof/Makefile b/src/regress/lib/libcrypto/wycheproof/Makefile
index f2f7910b5b..a68a270580 100644
--- a/src/regress/lib/libcrypto/wycheproof/Makefile
+++ b/src/regress/lib/libcrypto/wycheproof/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.9 2023/07/08 19:41:07 tb Exp $
+# $OpenBSD: Makefile,v 1.10 2025/07/09 05:04:35 tb Exp $
 
 WYCHEPROOF_TESTVECTORS = /usr/local/share/wycheproof/testvectors/
 
@@ -18,11 +18,17 @@ REGRESS_TARGETS += regress-wycheproof
 CLEANFILES +=   wycheproof
 
 wycheproof: wycheproof.go
-        go build -o wycheproof ${.CURDIR}/wycheproof.go
+        env GOCACHE=${.OBJDIR}/go-build go build -o wycheproof ${.CURDIR}/wycheproof.go
 
 regress-wycheproof: wycheproof
         ./wycheproof
 
+REGRESS_CLEANUP =       clean-go-cache
+
+clean-go-cache:
+        env GOCACHE=${.OBJDIR}/go-build go clean -cache
+        rm -rf ${.OBJDIR}/go-build
+
 . endif
 
 PROGS += wycheproof-primes