Use fewer processes while building OpenBLAS

Closes #15716

deps/Makefile

@@ -1184,10 +1184,11 @@ else ifeq ($(OPENBLAS_NO_AVX2), 1)
 OPENBLAS_BUILD_OPTS += NO_AVX2=1
 endif
 
+# Do not overwrite the "-j" flag
+OPENBLAS_BUILD_OPTS += MAKE_NB_JOBS=0
+
 $(BUILDDIR)/$(OPENBLAS_SRC_DIR)/config.status: $(BUILDDIR)/$(OPENBLAS_SRC_DIR)/Makefile
-ifeq ($(OS),WINNT)
-	cd $(dir $@) && patch -p1 < $(SRCDIR)/openblas-win64.patch
-endif
+	cd $(dir $@) && patch -p1 < $(SRCDIR)/openblas-make.patch
 	perl -i -ple 's/^\s*(EXTRALIB\s*\+=\s*-lSystemStubs)\s*$$/# $$1/g' $<.system
 	touch $@
 $(OPENBLAS_OBJ_SOURCE): $(BUILDDIR)/$(OPENBLAS_SRC_DIR)/config.status

deps/checksums/openblas-a71e8c82f6a9f73093b631e5deab1e8da716b61f.tar.gz/md5

@@ -0,0 +1 @@
+a3850786d63f4af657d2aeb1baab5b20

deps/checksums/openblas-a71e8c82f6a9f73093b631e5deab1e8da716b61f.tar.gz/sha512

@@ -0,0 +1 @@
+0a3e7bb0660148207732a58d411bb492f674d57e6733eee1c293b749f00516efd9d47e62193a9ac480bbbddb0b25c5bd4a66eb9caa717a0d2906c9dcbb3c39fe

deps/openblas-make.patch

@@ -0,0 +1,34 @@
+commit 7aac0aff8ec22598734f5effa2fcc107c95c0655
+diff --git a/Makefile.rule b/Makefile.rule
+index 847ee1c..6d0d8f4 100644
+--- a/Makefile.rule
++++ b/Makefile.rule
+@@ -112,7 +112,10 @@ NO_AFFINITY = 1
+ # NO_PARALLEL_MAKE = 1
+
+ # Force number of make jobs. The default is the number of logical CPU of the host.
+-# This is particularly useful when using distcc
++# This is particularly useful when using distcc.
++# A negative value will disable adding a -j flag to make, allowing to use a parent
++# make -j value. This is usefull to call OpenBLAS make from an other project
++# makefile
+ # MAKE_NB_JOBS = 2
+
+ # If you would like to know minute performance report of GotoBLAS.
+diff --git a/getarch.c b/getarch.c
+index f9c49e6..1e0b086 100644
+--- a/getarch.c
++++ b/getarch.c
+@@ -1013,7 +1013,12 @@ int main(int argc, char *argv[]){
+ #endif
+
+ #ifdef MAKE_NB_JOBS
++  #if MAKE_NB_JOBS > 0
+     printf("MAKE += -j %d\n", MAKE_NB_JOBS);
++  #else
++    // Let make use parent -j argument or -j1 if there
++    // is no make parent
++  #endif
+ #elif NO_PARALLEL_MAKE==1
+     printf("MAKE += -j 1\n");
+ #else

deps/openblas.version

@@ -1,2 +1,2 @@
-OPENBLAS_BRANCH=v0.2.15
-OPENBLAS_SHA1=53e849f4fcae4363a64576de00e982722c7304f9
+OPENBLAS_BRANCH=v0.2.17
+OPENBLAS_SHA1=a71e8c82f6a9f73093b631e5deab1e8da716b61f