Bug 1712350 - Create a mozmake toolchain artifact for Windows. r=firefox-build-system-reviewers,mhentges

The script is derived from the one in https://hg.mozilla.org/mozilla-build/file/3b8c537ca3c879551956ad47ca9f089583f647c5/make-mozmake.sh
We take on the occasion to update to Make 4.3, which also means we need
less things because it's not coming off git.
We also apply the patch from http://savannah.gnu.org/bugs/?58656.

Differential Revision: https://phabricator.services.mozilla.com/D116063

taskcluster/ci/fetch/toolchains.yml

@@ -594,3 +594,14 @@ nodejs-10-win64:
         artifact-name: nodejs.tar.zst
         strip-components: 1
         add-prefix: node/
+
+gnumake:
+    description: GNU make source
+    fetch:
+        type: static-url
+        url: http://ftp.gnu.org/gnu/make/make-4.3.tar.gz
+        sha256: e05fdde47c5f7ca45cb697e973894ff4f5d79e13b750ed57d7b66d8defc78e19
+        size: 2317073
+        artifact-name: make.tar.zst
+        strip-components: 1
+        add-prefix: make/

taskcluster/ci/toolchain/misc.yml

@@ -342,3 +342,19 @@ linux64-makecab:
             - makecab
         toolchain:
             - linux64-rust-1.47
+
+win64-mozmake:
+    description: "mozmake for Windows"
+    treeherder:
+        symbol: TW64(mozmake)
+    worker:
+        env:
+            TOOLTOOL_MANIFEST: "browser/config/tooltool-manifests/vs2017-15.8.manifest"
+    worker-type: b-win2012
+    run:
+        script: build-mozmake.sh
+        toolchain-artifact: public/build/mozmake.tar.bz2
+        tooltool-downloads: internal
+    fetches:
+        fetch:
+            - gnumake

taskcluster/scripts/misc/build-mozmake.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+set -x -e -v
+
+. $GECKO_PATH/taskcluster/scripts/misc/tooltool-download.sh
+. $GECKO_PATH/taskcluster/scripts/misc/vs-setup.sh
+
+cd $MOZ_FETCHES_DIR/make
+
+# Patch for http://savannah.gnu.org/bugs/?58656
+patch -p1 <<'EOF'
+diff --git a/src/remake.c b/src/remake.c
+index fb237c5..b2ba069 100644
+--- a/src/remake.c
++++ b/src/remake.c
+@@ -35,6 +35,13 @@ this program.  If not, see <http://www.gnu.org/licenses/>.  */
+ #endif
+ #ifdef WINDOWS32
+ #include <io.h>
++#include <sys/stat.h>
++#if defined(_MSC_VER) && _MSC_VER > 1200
++/* VC7 or later support _stat64 to access 64-bit file size. */
++#define stat64 _stat64
++#else
++#define stat64 stat
++#endif
+ #endif
+
+
+@@ -1466,7 +1473,11 @@ static FILE_TIMESTAMP
+ name_mtime (const char *name)
+ {
+   FILE_TIMESTAMP mtime;
++#if defined(WINDOWS32)
++  struct stat64 st;
++#else
+   struct stat st;
++#endif
+   int e;
+
+ #if defined(WINDOWS32)
+@@ -1498,7 +1509,7 @@ name_mtime (const char *name)
+         tend = &tem[0];
+       }
+
+-    e = stat (tem, &st);
++    e = stat64 (tem, &st);
+     if (e == 0 && !_S_ISDIR (st.st_mode) && tend < tem + (p - name - 1))
+       {
+         errno = ENOTDIR;
+EOF
+
+chmod +w src/config.h.W32
+sed -i "/#define BATCH_MODE_ONLY_SHELL/s/\/\*\(.*\)\*\//\1/" src/config.h.W32
+cmd /c build_w32.bat
+
+mkdir mozmake
+cp WinRel/gnumake.exe mozmake/mozmake.exe
+
+tar -acf mozmake.tar.bz2 mozmake
+mkdir -p $UPLOAD_DIR
+cp mozmake.tar.bz2 $UPLOAD_DIR
+
+. $GECKO_PATH/taskcluster/scripts/misc/vs-cleanup.sh