Document how the Monero iOS library is built

apps/ios/Monero/toolchain/depends/packages/zeromq.mk

@@ -0,0 +1,37 @@
+package=zeromq
+$(package)_version=4.3.4
+$(package)_download_path=https://github.com/zeromq/libzmq/releases/download/v$($(package)_version)/
+$(package)_file_name=$(package)-$($(package)_version).tar.gz
+$(package)_sha256_hash=c593001a89f5a85dd2ddf564805deb860e02471171b3f204944857336295c3e5
+$(package)_patches=06aba27b04c5822cb88a69677382a0f053367143.patch
+
+define $(package)_set_vars
+  $(package)_config_opts=--without-documentation --disable-shared --without-libsodium --disable-curve
+  $(package)_config_opts_linux=--with-pic
+  $(package)_config_opts_freebsd=--with-pic
+  $(package)_config_opts_ios=--host=aarch64-apple-darwin --with-pic
+  $(package)_cxxflags=-std=c++11
+  $(package)_cxxflags_ios=-std=c++11 -isysroot $(IOS_SDK_ROOT) -stdlib=libc++ -Wno-deprecated-declarations
+endef
+
+define $(package)_preprocess_cmds
+  patch -p1 < $($(package)_patch_dir)/06aba27b04c5822cb88a69677382a0f053367143.patch
+endef
+
+define $(package)_config_cmds
+  $($(package)_autoconf) AR_FLAGS=$($(package)_arflags)
+endef
+
+define $(package)_build_cmds
+  $(MAKE) src/libzmq.la
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install-libLTLIBRARIES install-includeHEADERS install-pkgconfigDATA
+endef
+
+define $(package)_postprocess_cmds
+  rm -rf bin share &&\
+  rm lib/*.la
+endef
+