Add make install with support for prefix and GNU standard locations

.github/workflows/install.yml

@@ -0,0 +1,49 @@
+name: Test install
+
+on: 
+  push:
+    branches:
+      - main
+    paths:
+      - 'src/**'
+      - 'include/**'
+      - 'tools/src/**'
+      - 'Makefile'
+      - '*.mk'
+      - '.github/workflows/install.yml'
+
+  pull_request:
+    paths:
+      - 'src/**'
+      - 'include/**'
+      - 'tools/src/**'
+      - 'Makefile'
+      - '*.mk'
+      - '.github/workflows/install.yml'
+
+jobs:
+
+  install:
+    runs-on: ubuntu-latest
+    env:
+      CC: gcc
+      XCHANGE: xchange
+    steps:
+    - name: Check out RedisX
+      uses: actions/checkout@v4
+
+    - name: Check out xchange 
+      uses: actions/checkout@v4
+      with:
+        repository: Smithsonian/xchange
+        path: xchange
+
+    - name: install doxygen
+      run: sudo apt-get install doxygen
+
+    - name: Build xchange shared libs
+      run: make -C xchange shared
+
+    - name: Install to default location
+      run: sudo make install
+

Makefile

@@ -95,6 +95,43 @@ Doxyfile.local: Doxyfile Makefile
 local-dox: README-redisx.md Doxyfile.local
 	doxygen Doxyfile.local
 
+# Default values for install locations
+# See https://www.gnu.org/prep/standards/html_node/Directory-Variables.html 
+prefix ?= /usr
+exec_prefix ?= $(prefix)
+libdir ?= $(exec_prefix)/lib
+includedir ?= $(prefix)/include
+datarootdir ?= $(prefix)/share
+datadir ?= $(datarootdir)
+mydatadir ?= $(datadir)/redisx
+docdir ?= $(datarootdir)/doc/redisx
+htmldir ?= $(docdir)/html
+
+.PHONY: install
+install: install-libs install-headers install-apidoc
+
+.PHONY: install-libs
+install-libs: shared
+	@echo "installing libraries to $(libdir)"
+	install -d $(libdir)
+	install -m 755 -D $(LIB)/lib*.so* $(libdir)/
+
+.PHONY: install-headers
+install-headers:
+	@echo "installing headers to $(includedir)"
+	install -d $(includedir)
+	install -m 644 -D include/* $(includedir)/
+
+.PHONY: install-apidoc
+install-apidoc: local-dox
+	@echo "installing API documentation to $(htmldir)"
+	install -d $(htmldir)/search
+	install -m 644 -D apidoc/html/search/* $(htmldir)/search/
+	install -m 644 -D apidoc/html/*.* $(htmldir)/
+	@echo "installing Doxygen tag file to $(docdir)"
+	install -d $(docdir)
+	install -m 644 -D apidoc/*.tag $(docdir)/
+
 # Built-in help screen for `make help`
 .PHONY: help
 help:
@@ -108,6 +145,7 @@ help:
 	@echo "  local-dox     Compiles local HTML API documentation using 'doxygen'."
 	@echo "  check         Performs static analysis with 'cppcheck'."
 	@echo "  all           All of the above."
+	@echo "  install       Install components (e.g. 'make prefix=<path> install')"
 	@echo "  clean         Removes intermediate products."
 	@echo "  distclean     Deletes all generated files."
 	@echo

README.md

@@ -119,6 +119,19 @@ After configuring, you can simply run `make`, which will build the `shared` (`li
 analysis via the `check` target. Or, you may build just the components you are interested in, by specifying the
 desired `make` target(s). (You can use `make help` to get a summary of the available `make` targets). 
 
+After building the library you can install the above components to the desired locations on your system. For a 
+system-wide install you may simply run:
+
+```bash
+  $ sudo make install
+```
+
+Or, to install in some other locations, you may set a prefix. For example to install under `/opt` instead, you can:
+
+```bash
+  $ sudo make prefix=/opt install
+```
+
 -----------------------------------------------------------------------------
 
 <a name="linking"></a>