From af11d074ac33454f3af895846c2a42564f583f41 Mon Sep 17 00:00:00 2001
From: Niels De Graef <ndegraef@redhat.com>
Date: Mon, 24 Nov 2025 00:58:18 +0100
Subject: [PATCH] Build libstemmer as shared library

Adjust the `GNUmakefile` with the appropriate flags, and add a symbol
map to prevent any unwanted symbols from "leaking" into our codebase.
---
 GNUmakefile           | 22 +++++++++++-----------
 libstemmer/symbol.map |  6 ++++++
 2 files changed, 17 insertions(+), 11 deletions(-)
 create mode 100644 libstemmer/symbol.map

diff --git a/GNUmakefile b/GNUmakefile
index df2efb6..d00b57f 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -281,12 +281,12 @@ DART_BUILD_ARTIFACTS = dart/.dart_tool dart/pubspec.lock dart/.dart_deps
 JAVA_CLASSES = $(JAVA_SOURCES:.java=.class)
 JAVA_RUNTIME_CLASSES=$(JAVA_RUNTIME_SOURCES:.java=.class)
 
-CFLAGS=-g -O2 -W -Wall -Wcast-qual -Wmissing-prototypes -Wmissing-declarations -Wshadow $(WERROR)
+CFLAGS=-g -fPIC -W -Wall -Wcast-qual -Wmissing-prototypes -Wmissing-declarations -Wshadow $(WERROR)
 CPPFLAGS=
 
 INCLUDES=-Iinclude
 
-all: snowball$(EXEEXT) libstemmer.a stemwords$(EXEEXT) $(C_OTHER_SOURCES) $(C_OTHER_HEADERS) $(C_OTHER_OBJECTS)
+all: snowball$(EXEEXT) libstemmer.so stemwords$(EXEEXT) $(C_OTHER_SOURCES) $(C_OTHER_HEADERS) $(C_OTHER_OBJECTS)
 
 algorithms.mk: GNUmakefile libstemmer/mkalgorithms.pl $(MODULES)
 	libstemmer/mkalgorithms.pl algorithms.mk $(MODULES)
@@ -294,7 +294,7 @@ algorithms.mk: GNUmakefile libstemmer/mkalgorithms.pl $(MODULES)
 clean:
 	rm -f $(COMPILER_OBJECTS) $(RUNTIME_OBJECTS) \
 	      $(LIBSTEMMER_OBJECTS) $(LIBSTEMMER_UTF8_OBJECTS) $(STEMWORDS_OBJECTS) snowball$(EXEEXT) \
-	      libstemmer.a stemwords$(EXEEXT) \
+	      libstemmer.so stemwords$(EXEEXT) \
               libstemmer/modules.h \
               libstemmer/modules_utf8.h \
 	      $(ADA_SOURCES) ada/bin/generate ada/bin/stemwords \
@@ -382,20 +382,20 @@ libstemmer/modules_utf8.h libstemmer/mkinc_utf8.mak: libstemmer/mkmodules.pl $(M
 
 libstemmer/libstemmer.o: libstemmer/modules.h $(C_LIB_HEADERS)
 
-libstemmer.a: libstemmer/libstemmer.o $(RUNTIME_OBJECTS) $(C_LIB_OBJECTS)
+libstemmer.so: libstemmer/libstemmer.o $(RUNTIME_OBJECTS) $(C_LIB_OBJECTS)
 	$(AR) -cru $@ $^
 
 examples/%.o: examples/%.c
 	$(CC) $(CFLAGS) $(INCLUDES) $(CPPFLAGS) -c -o $@ $<
 
-stemwords$(EXEEXT): $(STEMWORDS_OBJECTS) libstemmer.a
+stemwords$(EXEEXT): $(STEMWORDS_OBJECTS) libstemmer.so
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
 
 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) -shared $(LDFLAGS) -Wl,-soname,$@,-version-script,libstemmer/symbol.map -o $@ $^
 
 $(c_src_dir)/stem_UTF_8_%.c $(c_src_dir)/stem_UTF_8_%.h: $(ALGORITHMS)/%.sbl snowball$(EXEEXT)
 	@mkdir -p $(c_src_dir)
@@ -568,13 +568,13 @@ dist_libstemmer_c: \
 	echo 'endif' >> $${dest}/Makefile && \
 	echo 'CFLAGS=-O2' >> $${dest}/Makefile && \
 	echo 'CPPFLAGS=-Iinclude' >> $${dest}/Makefile && \
-	echo 'all: libstemmer.a stemwords$$(EXEEXT)' >> $${dest}/Makefile && \
-	echo 'libstemmer.a: $$(snowball_sources:.c=.o)' >> $${dest}/Makefile && \
+	echo 'all: libstemmer.so stemwords$$(EXEEXT)' >> $${dest}/Makefile && \
+	echo 'libstemmer.so: $$(snowball_sources:.c=.o)' >> $${dest}/Makefile && \
 	echo '	$$(AR) -cru $$@ $$^' >> $${dest}/Makefile && \
-	echo 'stemwords$$(EXEEXT): examples/stemwords.o libstemmer.a' >> $${dest}/Makefile && \
+	echo 'stemwords$$(EXEEXT): examples/stemwords.o libstemmer.so' >> $${dest}/Makefile && \
 	echo '	$$(CC) $$(CFLAGS) -o $$@ $$^' >> $${dest}/Makefile && \
 	echo 'clean:' >> $${dest}/Makefile && \
-	echo '	rm -f stemwords$$(EXEEXT) libstemmer.a *.o $(c_src_dir)/*.o examples/*.o runtime/*.o libstemmer/*.o' >> $${dest}/Makefile && \
+	echo '	rm -f stemwords$$(EXEEXT) libstemmer.so *.o $(c_src_dir)/*.o examples/*.o runtime/*.o libstemmer/*.o' >> $${dest}/Makefile && \
 	(cd dist && tar zcf $${destname}$(tarball_ext) $${destname}) && \
 	rm -rf $${dest}
 
diff --git a/libstemmer/symbol.map b/libstemmer/symbol.map
new file mode 100644
index 0000000..7a3d423
--- /dev/null
+++ b/libstemmer/symbol.map
@@ -0,0 +1,6 @@
+SB_STEMMER_0 {
+    global:
+        sb_stemmer_*;
+    local:
+        *;
+};
-- 
2.52.0