added test linking user program to multi-threaded libzstd

.travis.yml

@@ -64,6 +64,9 @@ matrix:
         - CC=gcc-7 CFLAGS=-Werror make -j all
         - make clean
         - LDFLAGS=-Wl,--no-undefined make -C lib libzstd-mt
+        - make -C tests zbufftest-dll
+        # LDFLAGS=-Wl,--no-undefined : will make the linker fail if dll is underlinked
+        # zbufftest-dll : test that a user program can link to multi-threaded libzstd without specifying -pthread
 
     - name: gcc-8 + ASan + UBSan + Test Zstd   # ~6.5mn
       script:

programs/Makefile

@@ -79,6 +79,9 @@ endif
 # Sort files in alphabetical order for reproducible builds
 ZSTDLIB_FILES := $(sort $(wildcard $(ZSTD_FILES)) $(wildcard $(ZSTDLEGACY_FILES)) $(wildcard $(ZDICT_FILES)))
 
+ZSTD_CLI_FILES := $(wildcard *.c)
+ZSTD_CLI_OBJ := $(patsubst %.c,%.o,$(ZSTD_CLI_FILES))
+
 # Define *.exe as extension for Windows systems
 ifneq (,$(filter Windows%,$(OS)))
 EXT =.exe
@@ -172,7 +175,7 @@ zstd : CPPFLAGS += -DZSTD_LEGACY_SUPPORT=$(ZSTD_LEGACY_SUPPORT)
 ifneq (,$(filter Windows%,$(OS)))
 zstd : $(RES_FILE)
 endif
-zstd : $(ZSTDLIB_FILES) zstdcli.o util.o timefn.o fileio.o benchfn.o benchzstd.o datagen.o dibio.o
+zstd : $(ZSTDLIB_FILES) $(ZSTD_CLI_OBJ)
 	@echo "$(THREAD_MSG)"
 	@echo "$(ZLIB_MSG)"
 	@echo "$(LZMA_MSG)"
@@ -190,10 +193,10 @@ zstd32 : CPPFLAGS += -DZSTD_LEGACY_SUPPORT=$(ZSTD_LEGACY_SUPPORT)
 ifneq (,$(filter Windows%,$(OS)))
 zstd32 : $(RES32_FILE)
 endif
-zstd32 : $(ZSTDLIB_FILES) zstdcli.c util.c timefn.c fileio.c benchfn.c benchzstd.c datagen.c dibio.c
+zstd32 : $(ZSTDLIB_FILES) $(ZSTD_CLI_FILES)
 	$(CC) -m32 $(FLAGS) $^ -o $@$(EXT)
 
-zstd-nolegacy : $(ZSTD_FILES) $(ZDICT_FILES) zstdcli.o util.o fileio.c benchfn.o benchzstd.o timefn.o datagen.o dibio.o
+zstd-nolegacy : $(ZSTD_FILES) $(ZDICT_FILES) $(ZSTD_CLI_OBJ)
 	$(CC) $(FLAGS) $^ -o $@$(EXT) $(LDFLAGS)
 
 zstd-nomt : THREAD_CPP :=
@@ -211,6 +214,19 @@ zstd-noxz : LZMALD  :=
 zstd-noxz : LZMA_MSG := - xz/lzma support is disabled
 zstd-noxz : zstd
 
+# note : the following target doesn't build
+#        because zstd uses non-public symbols from libzstd
+#        such as XXH64 (for benchmark),
+#        ZDICT_trainFromBuffer_unsafe_legacy for dictionary builder
+#        and ZSTD_cycleLog (likely for --patch-from)
+#        It's unclear at this stage if this is a scenario we want to support
+## zstd-dll: zstd executable linked to dynamic library libzstd (must already exist)
+.PHONY: zstd-dll
+zstd-dll : LDFLAGS+= -L$(ZSTDDIR) -lzstd
+zstd-dll : ZSTDLIB_FILES =
+zstd-dll : $(ZSTD_CLI_OBJ)
+	$(CC) $(FLAGS) $^ -o $@$(EXT) $(LDFLAGS)
+
 
 zstd-pgo :
 	$(MAKE) clean

tests/Makefile

@@ -91,6 +91,7 @@ allnothread: MULTITHREAD_CPP=
 allnothread: MULTITHREAD_LD=
 allnothread: fullbench fuzzer paramgrill datagen decodecorpus
 
+# note : broken : requires symbols unavailable from dynamic library
 dll: fuzzer-dll zstreamtest-dll
 
 PHONY: zstd zstd32 zstd-nolegacy  # must be phony, only external makefile knows how to build them, or if they need an update
@@ -98,12 +99,15 @@ zstd zstd32 zstd-nolegacy:
 	$(MAKE) -C $(PRGDIR) $@ MOREFLAGS+="$(DEBUGFLAGS)"
 
 gzstd:
-	$(MAKE) -C $(PRGDIR) zstd HAVE_ZLIB=1 MOREFLAGS+="$(DEBUGFLAGS)"
+	$(MAKE) -C $(PRGDIR) $@ HAVE_ZLIB=1 MOREFLAGS+="$(DEBUGFLAGS)"
 
-.PHONY: zstd-dll
-zstd-dll :
+.PHONY: libzstd
+libzstd :
 	$(MAKE) -C $(ZSTDDIR) libzstd
 
+%-dll : libzstd
+%-dll : LDFLAGS+= -L$(ZSTDDIR) -lzstd
+
 .PHONY: zstd-staticLib
 zstd-staticLib :
 	$(MAKE) -C $(ZSTDDIR) libzstd.a
@@ -141,9 +145,7 @@ fullbench-lib : zstd-staticLib
 fullbench-lib : $(PRGDIR)/datagen.c $(PRGDIR)/util.c $(PRGDIR)/timefn.c $(PRGDIR)/benchfn.c fullbench.c
 	$(CC) $(FLAGS) $(filter %.c,$^) -o $@$(EXT) $(ZSTDDIR)/libzstd.a
 
-# note : broken : requires unavailable symbols
-fullbench-dll : zstd-dll
-fullbench-dll : LDFLAGS+= -L$(ZSTDDIR) -lzstd
+# note : broken : requires symbols unavailable from dynamic library
 fullbench-dll: $(PRGDIR)/datagen.c $(PRGDIR)/util.c $(PRGDIR)/benchfn.c $(PRGDIR)/timefn.c fullbench.c
 #	$(CC) $(FLAGS) $(filter %.c,$^) -o $@$(EXT) -DZSTD_DLL_IMPORT=1 $(ZSTDDIR)/dll/libzstd.dll
 	$(CC) $(FLAGS) $(filter %.c,$^) -o $@$(EXT)
@@ -156,8 +158,7 @@ fuzzer32: $(ZSTD_FILES)
 fuzzer fuzzer32 : $(ZDICT_FILES) $(PRGDIR)/util.c $(PRGDIR)/timefn.c $(PRGDIR)/datagen.c fuzzer.c
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 
-fuzzer-dll : zstd-dll
-fuzzer-dll : LDFLAGS+= -L$(ZSTDDIR) -lzstd
+# note : broken : requires symbols unavailable from dynamic library
 fuzzer-dll : $(ZSTDDIR)/common/xxhash.c $(PRGDIR)/util.c $(PRGDIR)/timefn.c $(PRGDIR)/datagen.c fuzzer.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) $(filter %.c,$^) $(LDFLAGS) -o $@$(EXT)
 
@@ -167,8 +168,6 @@ zbufftest32 : CFLAGS +=  -m32
 zbufftest zbufftest32 : $(ZSTD_OBJECTS) $(ZBUFF_FILES) $(PRGDIR)/util.c $(PRGDIR)/timefn.c $(PRGDIR)/datagen.c zbufftest.c
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 
-zbufftest-dll : zstd-dll
-zbufftest-dll : LDFLAGS+= -L$(ZSTDDIR) -lzstd
 zbufftest-dll : $(ZSTDDIR)/common/xxhash.c $(PRGDIR)/util.c $(PRGDIR)/timefn.c $(PRGDIR)/datagen.c zbufftest.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) $(filter %.c,$^) $(LDFLAGS) -o $@$(EXT)
 
@@ -191,8 +190,7 @@ zstreamtest_tsan : CFLAGS += -fsanitize=thread
 zstreamtest_tsan : $(ZSTREAMFILES)
 	$(CC) $(FLAGS) $(MULTITHREAD) $^ -o $@$(EXT)
 
-zstreamtest-dll : zstd-dll
-zstreamtest-dll : LDFLAGS+= -L$(ZSTDDIR) -lzstd
+# note : broken : requires symbols unavailable from dynamic library
 zstreamtest-dll : $(ZSTDDIR)/common/xxhash.c  # xxh symbols not exposed from dll
 zstreamtest-dll : $(ZSTREAM_LOCAL_FILES)
 	$(CC) $(CPPFLAGS) $(CFLAGS) $(filter %.c,$^) $(LDFLAGS) -o $@$(EXT)