iFrom: Stefano Rivera <stefanor@debian.org>
Date: Sun, 24 Jan 2021 19:07:24 -0700
Subject: Build libstemmer as a shared library.

Forwarded: https://github.com/snowballstem/snowball/pull/42
---
 GNUmakefile | 42 ++++++++++++++++++++++++++++--------------
 1 file changed, 28 insertions(+), 14 deletions(-)

diff --git a/GNUmakefile b/GNUmakefile
index 8c50ec5..c9754be 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -65,6 +65,8 @@ ICONV = iconv
 STEMMING_DATA ?= ../snowball-data
 STEMMING_DATA_ABS := $(abspath $(STEMMING_DATA))
 
+STEMWORDS=LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ./stemwords$(EXEEXT)
+
 # Keep one in $(THIN_FACTOR) entries from gzipped vocabularies.
 THIN_FACTOR ?= 3
 
@@ -195,7 +197,7 @@ CPPFLAGS?=
 
 INCLUDES=-Iinclude
 
-all: snowball$(EXEEXT) libstemmer.a stemwords$(EXEEXT) $(C_OTHER_SOURCES) $(C_OTHER_HEADERS) $(C_OTHER_OBJECTS)
+all: snowball$(EXEEXT) libstemmer.a libstemmer.so stemwords$(EXEEXT) $(C_OTHER_SOURCES) $(C_OTHER_HEADERS) $(C_OTHER_OBJECTS)
 
 algorithms.mk: libstemmer/mkalgorithms.pl libstemmer/modules.txt
 	libstemmer/mkalgorithms.pl algorithms.mk libstemmer/modules.txt
@@ -203,7 +205,7 @@ algorithms.mk: libstemmer/mkalgorithms.pl libstemmer/modules.txt
 clean:
 	rm -f $(COMPILER_OBJECTS) $(RUNTIME_OBJECTS) \
 	      $(LIBSTEMMER_OBJECTS) $(LIBSTEMMER_UTF8_OBJECTS) $(STEMWORDS_OBJECTS) snowball$(EXEEXT) \
-	      libstemmer.a stemwords$(EXEEXT) \
+	      libstemmer.a libstemmer.so stemwords$(EXEEXT) \
               libstemmer/modules.h \
               libstemmer/modules_utf8.h \
 	      $(C_LIB_SOURCES) $(C_LIB_HEADERS) $(C_LIB_OBJECTS) \
@@ -219,7 +221,7 @@ clean:
               libstemmer/mkinc.mak libstemmer/mkinc_utf8.mak \
               libstemmer/libstemmer.c libstemmer/libstemmer_utf8.c \
 	      algorithms.mk
-	rm -rf ada/obj dist
+	rm -rf ada/obj dist .shared
 	-rmdir $(c_src_dir)
 	-rmdir $(python_output_dir)
 	-rmdir $(js_output_dir)
@@ -257,17 +259,25 @@ libstemmer/libstemmer.o: libstemmer/modules.h $(C_LIB_HEADERS)
 libstemmer.a: libstemmer/libstemmer.o $(RUNTIME_OBJECTS) $(C_LIB_OBJECTS)
 	$(AR) -cru $@ $^
 
+libstemmer.so: libstemmer/libstemmer.o $(RUNTIME_OBJECTS) $(C_LIB_OBJECTS)
+	$(CC) $(CFLAGS) -shared $(LDFLAGS) \
+	      -Wl,--version-script=debian/libstemmer.ver,-soname,libstemmer.so.0d \
+	      -o $@.0d.0.0 ${^:%=.shared/%}
+	ln -s $@.0d.0.0 $@.0d
+	ln -s $@.0d.0.0 $@
+	$(AR) -crs ${@:.so=.a} $^
+
 examples/%.o: examples/%.c
 	$(CC) $(CFLAGS) $(INCLUDES) $(CPPFLAGS) -c -o $@ $<
 
-stemwords$(EXEEXT): $(STEMWORDS_OBJECTS) libstemmer.a
-	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
+stemwords$(EXEEXT): $(STEMWORDS_OBJECTS) libstemmer.so
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(STEMWORDS_OBJECTS) -L. -lstemmer
 
 tests/%.o: tests/%.c
 	$(CC) $(CFLAGS) $(INCLUDES) $(CPPFLAGS) -c -o $@ $<
 
-stemtest$(EXEEXT): $(STEMTEST_OBJECTS) libstemmer.a
-	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
+stemtest$(EXEEXT): $(STEMTEST_OBJECTS) libstemmer.so
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(STEMTEST_OBJECTS) -L. -lstemmer
 
 csharp_stemwords$(EXEEXT): $(CSHARP_STEMWORDS_SOURCES) $(CSHARP_RUNTIME_SOURCES) $(CSHARP_SOURCES)
 	$(MCS) -unsafe -target:exe -out:$@ $(CSHARP_STEMWORDS_SOURCES) $(CSHARP_RUNTIME_SOURCES) $(CSHARP_SOURCES)
@@ -295,7 +305,6 @@ $(c_src_dir)/stem_ISO_8859_2_%.c $(c_src_dir)/stem_ISO_8859_2_%.h: algorithms/%.
 	./snowball charsets/ISO-8859-2.sbl $< -o "$(c_src_dir)/stem_ISO_8859_2_$*" -eprefix $*_ISO_8859_2_ -r ../runtime
 
 $(c_src_dir)/stem_%.o: $(c_src_dir)/stem_%.c $(c_src_dir)/stem_%.h
-	$(CC) $(CFLAGS) $(INCLUDES) $(CPPFLAGS) -c -o $@ $<
 
 $(java_src_dir)/%Stemmer.java: algorithms/%.sbl snowball$(EXEEXT)
 	@mkdir -p $(java_src_dir)
@@ -509,7 +518,7 @@ dist_libstemmer_js: $(JS_SOURCES) $(COMMON_FILES)
 check: check_stemtest check_utf8 check_iso_8859_1 check_iso_8859_2 check_koi8r
 
 check_stemtest: stemtest$(EXEEXT)
-	./stemtest
+	LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ./stemtest
 
 check_utf8: $(libstemmer_algorithms:%=check_utf8_%)
 
@@ -522,9 +531,9 @@ check_koi8r: $(KOI8_R_algorithms:%=check_koi8r_%)
 check_utf8_%: $(STEMMING_DATA)/% stemwords$(EXEEXT)
 	@echo "Checking output of $* stemmer with UTF-8"
 	@if test -f '$</voc.txt.gz' ; then \
-	  gzip -dc '$</voc.txt.gz'|./stemwords$(EXEEXT) -c UTF_8 -l $* -o tmp.txt; \
+	  gzip -dc '$</voc.txt.gz'|$(STEMWORDS) -c UTF_8 -l $* -o tmp.txt; \
 	else \
-	  ./stemwords$(EXEEXT) -c UTF_8 -l $* -i $</voc.txt -o tmp.txt; \
+	  $(STEMWORDS) -c UTF_8 -l $* -i $</voc.txt -o tmp.txt; \
 	fi
 	@if test -f '$</output.txt.gz' ; then \
 	  gzip -dc '$</output.txt.gz'|$(DIFF) -u - tmp.txt; \
@@ -536,7 +545,7 @@ check_utf8_%: $(STEMMING_DATA)/% stemwords$(EXEEXT)
 check_iso_8859_1_%: $(STEMMING_DATA)/% stemwords$(EXEEXT)
 	@echo "Checking output of $* stemmer with ISO_8859_1"
 	@$(ICONV) -f UTF-8 -t ISO-8859-1 '$</voc.txt' |\
-	    ./stemwords -c ISO_8859_1 -l $* -o tmp.txt
+	    $(STEMWORDS) -c ISO_8859_1 -l $* -o tmp.txt
 	@$(ICONV) -f UTF-8 -t ISO-8859-1 '$</output.txt' |\
 	    $(DIFF) -u - tmp.txt
 	@rm tmp.txt
@@ -544,7 +553,7 @@ check_iso_8859_1_%: $(STEMMING_DATA)/% stemwords$(EXEEXT)
 check_iso_8859_2_%: $(STEMMING_DATA)/% stemwords$(EXEEXT)
 	@echo "Checking output of $* stemmer with ISO_8859_2"
 	@$(ICONV) -f UTF-8 -t ISO-8859-2 '$</voc.txt' |\
-	    ./stemwords -c ISO_8859_2 -l $* -o tmp.txt
+	    $(STEMWORDS) -c ISO_8859_2 -l $* -o tmp.txt
 	@$(ICONV) -f UTF-8 -t ISO-8859-2 '$</output.txt' |\
 	    $(DIFF) -u - tmp.txt
 	@rm tmp.txt
@@ -552,7 +561,7 @@ check_iso_8859_2_%: $(STEMMING_DATA)/% stemwords$(EXEEXT)
 check_koi8r_%: $(STEMMING_DATA)/% stemwords$(EXEEXT)
 	@echo "Checking output of $* stemmer with KOI8R"
 	@$(ICONV) -f UTF-8 -t KOI8-R '$</voc.txt' |\
-	    ./stemwords -c KOI8_R -l $* -o tmp.txt
+	    $(STEMWORDS) -c KOI8_R -l $* -o tmp.txt
 	@$(ICONV) -f UTF-8 -t KOI8-R '$</output.txt' |\
 	    $(DIFF) -u - tmp.txt
 	@rm tmp.txt
@@ -797,4 +806,9 @@ ada/bin/generate:
 ada/bin/stemwords: $(ADA_SOURCES)
 	cd ada && $(gprbuild) -Pstemwords -p
 
+%.o: %.c
+	@mkdir -p $(shell dirname ${@:%=.shared/%})
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -fPIC -o ${@:%=.shared/%} $<
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
+
 .SUFFIXES: .class .java