CMakeLists.txt: Fix missing parameter names

VERSION must be indicated when passing a version string to project().
Also, LANGUAGES must be also be passed when the language name is not the
only argument to project() (apart from the project name itself).

.gitignore

@@ -1,3 +1,5 @@
 *.o
 *.obj
 *.a
+*.so
+*.so.*

CMakeLists.txt

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 cmake_minimum_required(VERSION 3.0)
-project(dynstr C)
+project(dynstr LANGUAGES C VERSION 0.1.0)
 add_library(${PROJECT_NAME} "dynstr.c")
 target_include_directories(${PROJECT_NAME} PUBLIC "include")
 install(TARGETS ${PROJECT_NAME})

Makefile

@@ -1,4 +1,4 @@
-# Copyright 2020 Xavier Del Campo Romero
+# Copyright 2020-2023 Xavier Del Campo Romero
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -14,31 +14,47 @@
 
 .POSIX:
 
-PREFIX = /usr/local
-DST = $(PREFIX)/lib
-PC_DST = $(DST)/pkgconfig
-PROJECT = libdynstr.a
-CFLAGS = -Iinclude
+prefix = /usr/local
+exec_prefix = $(prefix)
+includedir = $(prefix)/include
+libdir = $(exec_prefix)/lib
+pkgcfgdir = $(libdir)/pkgconfig
+PROJECT = libdynstr
+MAJOR_VERSION = 0
+MINOR_VERSION = 1
+PATCH_VERSION = 0
+VERSION = $(MAJOR_VERSION).$(MINOR_VERSION).$(PATCH_VERSION)
+PROJECT_A = $(PROJECT).a
+PROJECT_SO = $(PROJECT).so.$(VERSION)
+PROJECT_SO_FQ = $(PROJECT).so.$(MAJOR_VERSION)
+PROJECT_SO_NV = $(PROJECT).so
+CFLAGS = -Iinclude -fPIC -O1
+LDFLAGS = -shared
 DEPS = \
 	dynstr.o
 
-all: $(PROJECT)
+all: $(PROJECT_A) $(PROJECT_SO)
 
-install: $(PROJECT) $(PC_DST)/dynstr.pc
-	mkdir -p $(PREFIX)/include
-	cp include/dynstr.h $(PREFIX)/include
-	chmod 0644 $(PREFIX)/include/dynstr.h
-	mkdir -p $(DST)
-	cp $(PROJECT) $(DST)
-	chmod 0755 $(DST)/$(PROJECT)
+install: all $(pkgcfgdir)/dynstr.pc
+	mkdir -p $(DESTDIR)$(includedir)
+	cp include/dynstr.h $(DESTDIR)$(includedir)
+	chmod 0644 $(DESTDIR)$(includedir)/dynstr.h
+	mkdir -p $(DESTDIR)$(libdir)
+	cp $(PROJECT_A) $(PROJECT_SO) $(DESTDIR)$(libdir)
+	chmod 0755 $(libdir)/$(PROJECT_A) $(DESTDIR)$(libdir)/$(PROJECT_SO)
+	ln -fs $(DESTDIR)$(libdir)/$(PROJECT_SO) $(DESTDIR)$(libdir)/$(PROJECT_SO_FQ)
+	ln -fs $(DESTDIR)$(libdir)/$(PROJECT_SO) $(DESTDIR)$(libdir)/$(PROJECT_SO_NV)
 
 clean:
 	rm -f $(DEPS)
 
-$(PROJECT): $(DEPS)
+$(PROJECT_A): $(DEPS)
 	$(AR) $(ARFLAGS) $@ $(DEPS)
 
-$(PC_DST)/dynstr.pc: dynstr.pc
-	mkdir -p $(PC_DST)
-	sed -e 's,/usr/local,$(PREFIX),' $< > $@
+$(PROJECT_SO): $(DEPS)
+	$(CC) $(LDFLAGS) $(DEPS) -o $@
+
+$(pkgcfgdir)/dynstr.pc: dynstr.pc
+	mkdir -p $(DESTDIR)$(pkgcfgdir)
+	sed -e 's,/usr/local,$(DESTDIR)$(prefix),' $< > $@
 	chmod 0644 $@