Allow system versions of libwhich and libblastrampoline (#43000)

(cherry picked from commit ee4bcab)

Make.inc

@@ -41,6 +41,7 @@ USE_SYSTEM_LIBM:=0
 USE_SYSTEM_OPENLIBM:=0
 UNTRUSTED_SYSTEM_LIBM:=0
 USE_SYSTEM_DSFMT:=0
+USE_SYSTEM_LIBBLASTRAMPOLINE:=0
 USE_SYSTEM_BLAS:=0
 USE_SYSTEM_LAPACK:=0
 USE_SYSTEM_GMP:=0
@@ -1065,6 +1066,12 @@ else
 PATCHELF := $(build_depsbindir)/patchelf
 endif
 
+ifeq ($(USE_SYSTEM_LIBWHICH), 1)
+LIBWHICH := libwhich
+else
+LIBWHICH := $(build_depsbindir)/libwhich
+endif
+
 # On aarch64 and powerpc64le, we assume the page size is 64K.  Our binutils linkers
 # and such already assume this, but `patchelf` seems to be behind the times.  We
 # explicitly tell it to use this large page size so that when we rewrite rpaths and

Makefile

@@ -165,13 +165,14 @@ JL_TARGETS += julia-debug
 endif
 
 # private libraries, that are installed in $(prefix)/lib/julia
-JL_PRIVATE_LIBS-0 := libccalltest libllvmcalltest libjulia-internal libblastrampoline
+JL_PRIVATE_LIBS-0 := libccalltest libllvmcalltest libjulia-internal
 ifeq ($(BUNDLE_DEBUG_LIBS),1)
 JL_PRIVATE_LIBS-0 += libjulia-internal-debug
 endif
 ifeq ($(USE_GPL_LIBS), 1)
 JL_PRIVATE_LIBS-$(USE_SYSTEM_LIBSUITESPARSE) += libamd libbtf libcamd libccolamd libcholmod libcolamd libklu libldl librbio libspqr libsuitesparseconfig libumfpack
 endif
+JL_PRIVATE_LIBS-$(USE_SYSTEM_LIBBLASTRAMPOLINE) += libblastrampoline
 JL_PRIVATE_LIBS-$(USE_SYSTEM_PCRE) += libpcre2-8
 JL_PRIVATE_LIBS-$(USE_SYSTEM_DSFMT) += libdSFMT
 JL_PRIVATE_LIBS-$(USE_SYSTEM_GMP) += libgmp libgmpxx

base/Makefile

@@ -164,7 +164,7 @@ endif
 
 define symlink_system_library
 libname_$2 := $$(notdir $(call versioned_libname,$2,$3))
-libpath_$2 := $$(shell $$(call spawn,$$(build_depsbindir)/libwhich) -p $$(libname_$2) 2>/dev/null)
+libpath_$2 := $$(shell $$(call spawn,$$(LIBWHICH)) -p $$(libname_$2) 2>/dev/null)
 symlink_$2: $$(build_private_libdir)/$$(libname_$2)
 $$(build_private_libdir)/$$(libname_$2):
 	@if [ -e "$$(libpath_$2)" ]; then \
@@ -205,6 +205,7 @@ $(eval $(call symlink_system_library,CSL,libatomic,1,ALLOW_FAILURE))
 $(eval $(call symlink_system_library,CSL,libgomp,1,ALLOW_FAILURE))
 $(eval $(call symlink_system_library,PCRE,libpcre2-8))
 $(eval $(call symlink_system_library,DSFMT,libdSFMT))
+$(eval $(call symlink_system_library,LIBBLASTRAMPOLINE,libblastrampoline))
 $(eval $(call symlink_system_library,BLAS,$(LIBBLASNAME)))
 ifneq ($(LIBLAPACKNAME),$(LIBBLASNAME))
 $(eval $(call symlink_system_library,LAPACK,$(LIBLAPACKNAME)))

deps/Makefile

@@ -39,8 +39,9 @@ unexport CONFIG_SITE
 
 DEP_LIBS :=
 
-# Always use libblastrampoline
+ifeq ($(USE_SYSTEM_LIBBLASTRAMPOLINE), 0)
 DEP_LIBS += blastrampoline
+endif
 
 ifeq ($(USE_SYSTEM_CSL), 0)
 DEP_LIBS += csl
@@ -158,9 +159,11 @@ DEP_LIBS += lapack
 endif
 endif
 
+ifeq ($(USE_SYSTEM_LIBWHICH), 0)
 ifneq ($(OS), WINNT)
 DEP_LIBS += libwhich
 endif
+endif
 
 # list all targets
 DEP_LIBS_STAGED_ALL := llvm llvm-tools clang llvmunwind unwind libuv pcre \