Export LDFLAGS within OpenBLAS builder (#410)

* Export `LDFLAGS` within `OpenBLAS` builder

Otherwise, we get no RPATHs

* Patch out `-Ofast` on power

O/OpenBLAS/OpenBLAS@0.3.5/build_tarballs.jl

@@ -12,5 +12,5 @@ platforms = openblas_platforms()
 products = openblas_products()
 dependencies = []
 
-# Build the tarballs, and possibly a `build.jl` as well.
+# Build the tarballs
 build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; preferred_gcc_version=v"6")

O/OpenBLAS/OpenBLAS@0.3.5/bundled/patches/openblas-ofast-power.patch

@@ -0,0 +1,17 @@
+diff --git a/Makefile.power b/Makefile.power
+index a49372ad..6132495e 100644
+--- a/Makefile.power
++++ b/Makefile.power
+@@ -13,10 +13,10 @@ endif
+
+ ifeq ($(CORE), POWER8)
+ ifeq ($(USE_OPENMP), 1)
+-COMMON_OPT += -Ofast -mcpu=power8 -mtune=power8 -mvsx -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
++COMMON_OPT += -mcpu=power8 -mtune=power8 -mvsx -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
+ FCOMMON_OPT += -O2 -frecursive -mcpu=power8 -mtune=power8 -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
+ else
+-COMMON_OPT += -Ofast -mcpu=power8 -mtune=power8 -mvsx -malign-power -fno-fast-math
++COMMON_OPT += -mcpu=power8 -mtune=power8 -mvsx -malign-power -fno-fast-math
+ FCOMMON_OPT += -O2 -frecursive -mcpu=power8 -mtune=power8 -malign-power -fno-fast-math
+ endif
+ endif

O/OpenBLAS/OpenBLAS@0.3.7/build_tarballs.jl

@@ -12,6 +12,6 @@ platforms = openblas_platforms()
 products = openblas_products()
 dependencies = []
 
-# Build the tarballs, and possibly a `build.jl` as well.
+# Build the tarballs
 build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; preferred_gcc_version=v"6")
 

O/OpenBLAS/OpenBLAS@0.3.7/bundled/patches/openblas-ofast-power.patch

@@ -0,0 +1,29 @@
+diff --git a/Makefile.power b/Makefile.power
+index 24d8aa8a..e53a243a 100644
+--- a/Makefile.power
++++ b/Makefile.power
+@@ -11,20 +11,20 @@ endif
+
+ ifeq ($(CORE), POWER9)
+ ifeq ($(USE_OPENMP), 1)
+-COMMON_OPT += -Ofast -mcpu=power9 -mtune=power9 -mvsx -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
++COMMON_OPT += -mcpu=power9 -mtune=power9 -mvsx -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
+ FCOMMON_OPT += -O2 -frecursive -mcpu=power9 -mtune=power9 -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
+ else
+-COMMON_OPT += -Ofast -mcpu=power9 -mtune=power9 -mvsx -malign-power -fno-fast-math
++COMMON_OPT += -mcpu=power9 -mtune=power9 -mvsx -malign-power -fno-fast-math
+ FCOMMON_OPT += -O2 -frecursive -mcpu=power9 -mtune=power9 -malign-power -fno-fast-math
+ endif
+ endif
+
+ ifeq ($(CORE), POWER8)
+ ifeq ($(USE_OPENMP), 1)
+-COMMON_OPT += -Ofast -mcpu=power8 -mtune=power8 -mvsx -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
++COMMON_OPT += -mcpu=power8 -mtune=power8 -mvsx -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
+ FCOMMON_OPT += -O2 -frecursive -mcpu=power8 -mtune=power8 -malign-power -DUSE_OPENMP -fno-fast-math -fopenmp
+ else
+-COMMON_OPT += -Ofast -mcpu=power8 -mtune=power8 -mvsx -malign-power -fno-fast-math
++COMMON_OPT += -mcpu=power8 -mtune=power8 -mvsx -malign-power -fno-fast-math
+ FCOMMON_OPT += -O2 -frecursive -mcpu=power8 -mtune=power8 -malign-power -fno-fast-math
+ endif
+ endif

O/OpenBLAS/common.jl

@@ -74,9 +74,9 @@ function openblas_script(;kwargs...)
     # libgfortran and other friends alongside, we need an RPATH of '$ORIGIN',
     # so set it here.
     if [[ ${target} == *linux* ]] || [[ ${target} == *freebsd* ]]; then
-        LDFLAGS="${LDFLAGS} '-Wl,-rpath,\$\$ORIGIN' -Wl,-z,origin"
+        export LDFLAGS="${LDFLAGS} '-Wl,-rpath,\$\$ORIGIN' -Wl,-z,origin"
     elif [[ ${target} == *apple* ]]; then
-        LDFLAGS="${LDFLAGS} -Wl,-rpath,@loader_path/"
+        export LDFLAGS="${LDFLAGS} -Wl,-rpath,@loader_path/"
     fi