Merge pull request 'Makefile: enable static compilation with musl' (#229) from Shamar/snac2:build-with-musl into master

Reviewed-on: https://codeberg.org/grunfink/snac2/pulls/229

Makefile

@@ -1,4 +1,4 @@
-PREFIX=/usr/local
+PREFIX?=/usr/local
 PREFIX_MAN=$(PREFIX)/man
 CFLAGS?=-g -Wall -Wextra -pedantic
 
@@ -6,16 +6,16 @@ all: snac
 
 snac: snac.o main.o data.o http.o httpd.o webfinger.o \
     activitypub.o html.o utils.o format.o upgrade.o mastoapi.o
-	$(CC) $(CFLAGS) -L/usr/local/lib *.o -lcurl -lcrypto $(LDFLAGS) -pthread -o $@
+	$(CC) $(CFLAGS) -L$(PREFIX)/lib *.o -lcurl -lcrypto $(LDFLAGS) -pthread -o $@
 
 .c.o:
-	$(CC) $(CFLAGS) $(CPPFLAGS) -I/usr/local/include -c $<
+	$(CC) $(CFLAGS) $(CPPFLAGS) -I$(PREFIX)/include -c $<
 
 clean:
 	rm -rf *.o *.core snac makefile.depend
 
 dep:
-	$(CC) -I/usr/local/include -MM *.c > makefile.depend
+	$(CC) -I$(PREFIX)/include -MM *.c > makefile.depend
 
 install:
 	mkdir -p -m 755 $(PREFIX)/bin

examples/static-linking-with-musl.md

@@ -0,0 +1,77 @@
+# How to build a statically linked Snac with musl
+
+Prepare the environment
+```
+mkdir build
+cd build
+export BUILD_TARGET=$PWD
+export CC="musl-gcc"
+```
+
+Download and build latest zlib
+```
+wget http://zlib.net/current/zlib.tar.gz
+tar xvf zlib.tar.gz
+cd zlib-1.3.1/
+./configure --prefix=$BUILD_TARGET --static
+make
+make install
+cd ..
+```
+
+Download and build latest openssl
+```
+wget https://github.com/openssl/openssl/releases/download/openssl-3.4.0/openssl-3.4.0.tar.gz
+tar xvf openssl-3.4.0.tar.gz
+cd openssl-3.4.0
+CC="musl-gcc -fPIE -pie -static -idirafter /usr/include/ -idirafter /usr/include/x86_64-linux-gnu/" \
+   ./Configure no-shared no-async --prefix=$BUILD_TARGET --openssldir=$BUILD_TARGET/ssl linux-x86_64
+make depend
+make
+make install
+cd ..
+```
+
+Download and build latest curl
+```
+wget https://curl.se/download/curl-7.88.1.tar.gz
+tar xvf curl-7.88.1.tar.gz
+cd curl-7.88.1
+./configure --disable-shared --enable-static --disable-silent-rules \
+            --disable-debug --disable-warnings --disable-werror \
+            --disable-curldebug --disable-symbol-hiding --disable-ares \
+            --disable-rt --disable-ech --disable-dependency-tracking \
+            --disable-libtool-lock --enable-http --disable-ftp \
+            --disable-file --disable-ldap --disable-ldaps \
+            --disable-rtsp --disable-proxy --disable-dict \
+            --disable-telnet --disable-tftp --disable-pop3 \
+            --disable-imap --disable-smb --disable-smtp --disable-gopher \
+            --disable-mqtt --disable-manual --disable-libcurl-option --disable-ipv6 \
+            --disable-openssl-auto-load-config --disable-versioned-symbols 
+            --disable-verbose --disable-sspi --disable-crypto-auth \
+            --disable-ntlm --disable-ntlm-wb --disable-tls-srp \
+            --disable-unix-sockets --disable-cookies --disable-socketpair \
+            --disable-http-auth --disable-doh --disable-mime --disable-dateparse \
+            --disable-netrc --disable-progress-meter --disable-dnsshuffle \
+            --disable-get-easy-options --disable-alt-svc --disable-websockets \
+            --without-brotli --without-zstd --without-libpsl --without-libgsasl \
+            --without-librtmp --without-winidn --disable-threaded-resolver  \
+            --with-openssl=$BUILD_TARGET/ --with-zlib=$BUILD_TARGET/ \
+            --prefix=$BUILD_TARGET/
+make
+make install
+cd ..
+```
+
+Download and build latest snac2
+```
+git clone https://codeberg.org/grunfink/snac2.git # or cd to your existing repo
+cd snac2
+make CFLAGS="-g -Wall -Wextra -pedantic -static -DWITHOUT_SHM" \
+     LDFLAGS="-L$BUILD_TARGET/lib64 -lcurl -lssl -lcrypto -lz" \
+     PREFIX=$BUILD_TARGET 
+make install PREFIX=$BUILD_TARGET
+cd ..
+```
+
+Finally a statically linked snac is ready at $BUILD_TARGET/bin