build: unify static/dynamic linking across Linux and macOS

Replace the platform-specific linking logic (Linux: -static full
static binary; macOS: .a preferred with -l fallback) with a single
unified approach that works everywhere:

- Search for .a static archives in LIBRARY_DIRS and common paths
- If found, link the .a directly (static)
- If not found, fallback to -l (dynamic)

This removes the -static flag on Linux which required a static glibc
and broke builds in package managers like conda where only shared
system libraries are available.

Behavior is unchanged when static archives exist (e.g., user-compiled
libs). When only shared libs are available (conda, apt, etc.), the
build now succeeds instead of failing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: KimYannn

Makefile

@@ -18,21 +18,16 @@ CXX ?= g++
 CXXFLAGS := -std=c++11 -pthread -g -O3 -MD -MP -I. -I${DIR_INC} $(foreach includedir,$(INCLUDE_DIRS),-I$(includedir)) ${CXXFLAGS}
 LIBS := -lisal -ldeflate -lhwy -lpthread
 
-UNAME_S := $(shell uname -s)
-ifeq ($(UNAME_S),Linux)
-  # Linux: fully static binary
-  LD_FLAGS := $(foreach librarydir,$(LIBRARY_DIRS),-L$(librarydir)) -static -Wl,--no-as-needed -pthread $(LIBS) $(LD_FLAGS)
-else
-  # macOS: link 3rd-party libs statically via .a when available, fallback to dynamic
-  FIND_STATIC = $(firstword $(foreach d,$(LIBRARY_DIRS),$(wildcard $(d)/lib$(1).a)) $(wildcard /usr/local/lib/lib$(1).a /opt/homebrew/lib/lib$(1).a))
-  STATIC_LIBS :=
-  DYNAMIC_LIBS :=
-  $(foreach lib,isal deflate hwy,\
-    $(if $(call FIND_STATIC,$(lib)),\
-      $(eval STATIC_LIBS += $(call FIND_STATIC,$(lib))),\
-      $(eval DYNAMIC_LIBS += -l$(lib))))
-  LD_FLAGS := $(foreach librarydir,$(LIBRARY_DIRS),-L$(librarydir)) $(STATIC_LIBS) $(DYNAMIC_LIBS) -lpthread $(LD_FLAGS)
-endif
+# Link 3rd-party libs statically via .a when available, fallback to -l dynamic.
+# This works across Linux, macOS, and package managers (conda, brew, etc.).
+FIND_STATIC = $(firstword $(foreach d,$(LIBRARY_DIRS),$(wildcard $(d)/lib$(1).a)) $(wildcard /usr/local/lib/lib$(1).a /opt/homebrew/lib/lib$(1).a))
+STATIC_LIBS :=
+DYNAMIC_LIBS :=
+$(foreach lib,isal deflate hwy,\
+  $(if $(call FIND_STATIC,$(lib)),\
+    $(eval STATIC_LIBS += $(call FIND_STATIC,$(lib))),\
+    $(eval DYNAMIC_LIBS += -l$(lib))))
+LD_FLAGS := $(foreach librarydir,$(LIBRARY_DIRS),-L$(librarydir)) $(STATIC_LIBS) $(DYNAMIC_LIBS) -lpthread $(LD_FLAGS)
 
 
 ${BIN_TARGET}:${OBJ}