$NetBSD: patch-lib_Makefile,v 1.15 2024/04/02 20:05:57 adam Exp $

Detect and use third-party libraries (taken from programs/Makefile).
-fvisibility=hidden makes error when linking.
Enable the "install" target on all OS.
Fix pkgconfig installation path.

--- lib/Makefile.orig	2024-03-21 22:05:51.000000000 +0000
+++ lib/Makefile
@@ -69,6 +69,43 @@ decompress/zstd_decompress_block.o : CFL
 endif
 
 
+VOID = /dev/null
+
+# Make 4.3 doesn't support '\#' anymore (https://lwn.net/Articles/810071/)
+NUM_SYMBOL := \#
+
+# thread detection
+HAVE_PTHREAD := $(shell printf '$(NUM_SYMBOL)include <pthread.h>\nint main(void) { return 0; }' | $(CC) $(FLAGS) -o have_pthread$(EXT) -x c - -pthread 2> $(VOID) && rm have_pthread$(EXT) && echo 1 || echo 0)
+HAVE_THREAD := $(shell [ "$(HAVE_PTHREAD)" -eq "1" -o -n "$(filter Windows%,$(OS))" ] && echo 1 || echo 0)
+ifeq ($(HAVE_THREAD), 1)
+THREAD_MSG := ==> building with threading support
+THREAD_CPP := -DZSTD_MULTITHREAD
+THREAD_LD := -pthread
+endif
+
+# zlib detection
+HAVE_ZLIB := $(shell printf '$(NUM_SYMBOL)include <zlib.h>\nint main(void) { return 0; }' | $(CC) $(FLAGS) -o have_zlib$(EXT) -x c - -lz 2> $(VOID) && rm have_zlib$(EXT) && echo 1 || echo 0)
+ifeq ($(HAVE_ZLIB), 1)
+ZLIB_MSG := ==> building zstd with .gz compression support
+ZLIBCPP = -DZSTD_GZCOMPRESS -DZSTD_GZDECOMPRESS
+ZLIBLD = -lz
+endif
+
+# lzma detection
+HAVE_LZMA := $(shell printf '$(NUM_SYMBOL)include <lzma.h>\nint main(void) { return 0; }' | $(CC) $(FLAGS) -o have_lzma$(EXT) -x c - -llzma 2> $(VOID) && rm have_lzma$(EXT) && echo 1 || echo 0)
+ifeq ($(HAVE_LZMA), 1)
+LZMACPP = -DZSTD_LZMACOMPRESS -DZSTD_LZMADECOMPRESS
+LZMALD = -llzma
+endif
+
+# lz4 detection
+HAVE_LZ4 := $(shell printf '$(NUM_SYMBOL)include <lz4frame.h>\n$(NUM_SYMBOL)include <lz4.h>\nint main(void) { return 0; }' | $(CC) $(FLAGS) -o have_lz4$(EXT) -x c - -llz4 2> $(VOID) && rm have_lz4$(EXT) && echo 1 || echo 0)
+ifeq ($(HAVE_LZ4), 1)
+LZ4CPP = -DZSTD_LZ4COMPRESS -DZSTD_LZ4DECOMPRESS
+LZ4LD = -llz4
+endif
+
+
 # macOS linker doesn't support -soname, and use different extension
 # see : https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/DynamicLibraryDesignGuidelines.html
 ifeq ($(UNAME), Darwin)
@@ -261,7 +298,6 @@ clean:
 #-----------------------------------------------------------------------------
 # make install is validated only for below listed environments
 #-----------------------------------------------------------------------------
-ifneq (,$(filter $(UNAME),Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS Haiku AIX MSYS_NT CYGWIN_NT))
 
 lib: libzstd.pc
 
@@ -292,11 +328,7 @@ PCLIBPREFIX := $(if $(findstring $(LIBDI
 # to PREFIX, rather than as a resolved value.
 PCEXEC_PREFIX := $(if $(HAS_EXPLICIT_EXEC_PREFIX),$(EXEC_PREFIX),$${prefix})
 
-ifneq (,$(filter $(UNAME),FreeBSD NetBSD DragonFly))
-  PKGCONFIGDIR ?= $(PREFIX)/libdata/pkgconfig
-else
   PKGCONFIGDIR ?= $(LIBDIR)/pkgconfig
-endif
 
 ifneq (,$(filter $(UNAME),SunOS))
   INSTALL ?= ginstall
@@ -366,4 +398,3 @@ uninstall:
 	$(RM) $(DESTDIR)$(INCLUDEDIR)/zdict.h
 	@echo zstd libraries successfully uninstalled
 
-endif