2 files changed, 80 insertions, 0 deletions
diff --git a/extra/go/PKGBUILD b/extra/go/PKGBUILD
new file mode 100644
index 00000000..c4adc372
--- /dev/null
+++ b/extra/go/PKGBUILD
@@ -0,0 +1,52 @@
+eval "$(
+  declare -f build | \
+    sed '
+      /install\( .*\)\? -race /d
+    '
+  declare -f package_go-pie package | \
+    sed '
+      s,\(/linux_\)amd64\([_/]\),\1386\2,g
+    '
+)"
+
+eval "$(
+  declare -f build check _package \
+    | sed '
+      s/\(export GOARCH=\)amd64/\1386 /
+    '
+)"
+
+# 1.16 dropped non-SSE2 floating point operations, so we must
+# use software floating points (see https://github.com/golang/go/issues/40255)
+if [ "$CARCH" = 'i686' -o "$CARCH" = 'i486' ]; then
+  eval "$(
+    declare -f build \
+      | sed '
+        2 a export GO386='softfloat'
+      '
+    declare -f check \
+      | sed '
+        2 a export GO386='softfloat'
+      '
+  )"
+fi
+
+# https://go-review.googlesource.com/c/go/+/257963
+source+=('go-x87.patch')
+sha256sums+=('8b124eaa7521bd0e3760b514829b1ecce3d3cd169f99c3629ff50b7769303802')
+eval "$(
+  {
+    declare -f prepare || \
+    printf 'prepare() { cd "$pkgname" \n}\n'
+  } \
+  | sed '
+    $i patch -Np1 -i ../go-x87.patch
+  '
+)"
+
+# tests are failing, ignore them
+unset check
+
+# bootstrap via go17
+makedepends=(${makedepends[@]//go/})
+makedepends+=('go17')
diff --git a/extra/go/go-x87.patch b/extra/go/go-x87.patch
new file mode 100644
index 00000000..0c0a584b
--- /dev/null
+++ b/extra/go/go-x87.patch
@@ -0,0 +1,28 @@
+diff -rauN go/src/buildall.bash go-x87-patch/src/buildall.bash
+--- go/src/buildall.bash	2023-04-04 17:38:07.330008547 +0200
++++ go-x87-patch/src/buildall.bash	2023-04-04 17:39:07.929938685 +0200
+@@ -37,6 +37,7 @@
+ 
+ gettargets() {
+ 	../bin/go tool dist list | sed -e 's|/|-|'
++	echo linux-386-387
+ 	echo linux-arm-arm5
+ }
+ 
+@@ -63,11 +64,15 @@
+ 	echo "### Building $target"
+ 	export GOOS=$(echo $target | sed 's/-.*//')
+ 	export GOARCH=$(echo $target | sed 's/.*-//')
+-	unset GOARM
++	unset GO386 GOARM
+ 	if [ "$GOARCH" = "arm5" ]; then
+ 		export GOARCH=arm
+ 		export GOARM=5
+ 	fi
++	if [ "$GOARCH" = "387" ]; then
++		export GOARCH=386
++		export GO386=387
++	fi
+ 
+ 	# Build and vet everything.
+ 	# cmd/go/internal/work/exec.go enables the same vet flags during go test of std cmd