add openblas patch to fix build on musl libc

deps/blas.mk

@@ -80,7 +80,13 @@ endif
 # Do not overwrite the "-j" flag
 OPENBLAS_BUILD_OPTS += MAKE_NB_JOBS=0
 
-$(BUILDDIR)/$(OPENBLAS_SRC_DIR)/build-configured: $(BUILDDIR)/$(OPENBLAS_SRC_DIR)/source-extracted
+# Fix build on musl libc, from https://github.com/xianyi/OpenBLAS/pull/1257
+# remove when upgrading past openblas v0.2.20
+$(BUILDDIR)/$(OPENBLAS_SRC_DIR)/openblas-musl-PR1257.patch-applied: $(BUILDDIR)/$(OPENBLAS_SRC_DIR)/source-extracted
+	cd $(BUILDDIR)/$(OPENBLAS_SRC_DIR) && patch -p1 -f < $(SRCDIR)/patches/openblas-musl-PR1257.patch
+	echo 1 > $@
+
+$(BUILDDIR)/$(OPENBLAS_SRC_DIR)/build-configured: $(BUILDDIR)/$(OPENBLAS_SRC_DIR)/openblas-musl-PR1257.patch-applied
 	perl -i -ple 's/^\s*(EXTRALIB\s*\+=\s*-lSystemStubs)\s*$$/# $$1/g' $(dir $<)/Makefile.system
 	echo 1 > $@
 

deps/patches/openblas-musl-PR1257.patch

@@ -0,0 +1,65 @@
+From 63cfa32691680505e6b9daf0997755178ddd3144 Mon Sep 17 00:00:00 2001
+From: Martin Kroeker <[email protected]>
+Date: Mon, 31 Jul 2017 21:02:43 +0200
+Subject: [PATCH] Rework __GLIBC_PREREQ checks to avoid breaking non-glibc
+ builds
+
+---
+ driver/others/memory.c | 20 ++++++++++----------
+ 1 file changed, 10 insertions(+), 10 deletions(-)
+
+diff --git a/driver/others/memory.c b/driver/others/memory.c
+index b5b58b6fd..661f7c4eb 100644
+--- a/driver/others/memory.c
++++ b/driver/others/memory.c
+@@ -155,7 +155,6 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ #ifdef DYNAMIC_ARCH
+ gotoblas_t *gotoblas = NULL;
+ #endif
+-
+ extern void openblas_warning(int verbose, const char * msg);
+
+ #ifndef SMP
+@@ -187,25 +186,24 @@ int i,n;
+
+ #if !defined(__GLIBC_PREREQ)
+    return nums;
+-#endif   
+-#if !__GLIBC_PREREQ(2, 3)
++#else
++ #if !__GLIBC_PREREQ(2, 3)
+    return nums;
+-#endif   
++ #endif
+
+-#if !__GLIBC_PREREQ(2, 7)
++ #if !__GLIBC_PREREQ(2, 7)
+   ret = sched_getaffinity(0,sizeof(cpu_set_t), cpusetp);
+   if (ret!=0) return nums;
+   n=0;
+-#if !__GLIBC_PREREQ(2, 6)  
++  #if !__GLIBC_PREREQ(2, 6)
+   for (i=0;i<nums;i++)
+      if (CPU_ISSET(i,cpusetp)) n++;
+   nums=n;   
+-#else
++  #else
+   nums = CPU_COUNT(sizeof(cpu_set_t),cpusetp);
+-#endif
++  #endif
+   return nums;
+-#endif
+-
++ #else
+   cpusetp = CPU_ALLOC(nums);
+   if (cpusetp == NULL) return nums;
+   size = CPU_ALLOC_SIZE(nums);
+@@ -214,6 +212,8 @@ int i,n;
+   nums = CPU_COUNT_S(size,cpusetp);
+   CPU_FREE(cpusetp);
+   return nums;
++ #endif
++#endif
+ }
+ #endif
+ #endif