This is needed to build boost asio as a shared library rather than a
header-only library, which is needed to save memory.

This can be enabled by adding `PACKAGECONFIG:append = " asio"` to
`boost_%.bbappend`.

Signed-off-by: Gustav Lindberg <[email protected]>
---
 meta/recipes-support/boost/boost.inc          | 25 +++++++++++++++++++
 .../boost/boost/boost_asio.cpp                |  1 +
 2 files changed, 26 insertions(+)
 create mode 100644 meta/recipes-support/boost/boost/boost_asio.cpp

diff --git a/meta/recipes-support/boost/boost.inc 
b/meta/recipes-support/boost/boost.inc
index 64a57ddfb2..4ac3f7af5b 100644
--- a/meta/recipes-support/boost/boost.inc
+++ b/meta/recipes-support/boost/boost.inc
@@ -44,6 +44,7 @@ BOOST_LIBS = "\
        type_erasure \
        url \
        wave \
+       ${@bb.utils.contains('PACKAGECONFIG', 'asio', 'asio', '', d)} \
        ${@bb.utils.filter('PACKAGECONFIG', 'locale python', d)} \
        ${@bb.utils.contains('PACKAGECONFIG', 'graph_parallel', 'graph_parallel 
mpi', \
                             bb.utils.filter('PACKAGECONFIG', 'mpi', d), d)} \
@@ -51,11 +52,14 @@ BOOST_LIBS = "\
 
 # optional libraries
 PACKAGECONFIG ??= "locale python"
+PACKAGECONFIG[asio] = ",,"
 PACKAGECONFIG[locale] = ",,icu"
 PACKAGECONFIG[graph_parallel] = ",,,boost-mpi mpich"
 PACKAGECONFIG[mpi] = ",,mpich"
 PACKAGECONFIG[python] = ",,python3"
 
+SRC_URI:append = " ${@bb.utils.contains('PACKAGECONFIG', 'asio', 
'file://boost_asio.cpp', '', d)}"
+
 inherit python3-dir
 PYTHON_ROOT = "${STAGING_DIR_HOST}/${prefix}"
 
@@ -198,6 +202,20 @@ do_compile() {
                --debug-configuration
 }
 
+do_compile:append() {
+       if ${@bb.utils.contains('PACKAGECONFIG', 'asio', 'true', 'false', d)}; 
then
+               ${CXX} ${CPPFLAGS} ${CXXFLAGS} \
+                       -DBOOST_ASIO_DYN_LINK=1 \
+                       -I${S} \
+                       -fPIC \
+                       -shared \
+                       -Wl,-soname,libboost_asio.so.${PV} \
+                       ${UNPACKDIR}/boost_asio.cpp \
+                       ${LDFLAGS} \
+                       -o ${B}/libboost_asio.so.${PV}
+       fi
+}
+
 do_install() {
        cd ${S}
        b2 ${BJAM_OPTS} \
@@ -220,4 +238,11 @@ do_install() {
 
 }
 
+do_install:append() {
+       if ${@bb.utils.contains('PACKAGECONFIG', 'asio', 'true', 'false', d)}; 
then
+               install -Dm 0755 ${B}/libboost_asio.so.${PV} 
${D}${libdir}/libboost_asio.so.${PV}
+               ln -sf libboost_asio.so.${PV} ${D}${libdir}/libboost_asio.so
+       fi
+}
+
 BBCLASSEXTEND = "native nativesdk"
diff --git a/meta/recipes-support/boost/boost/boost_asio.cpp 
b/meta/recipes-support/boost/boost/boost_asio.cpp
new file mode 100644
index 0000000000..eb3b7262c3
--- /dev/null
+++ b/meta/recipes-support/boost/boost/boost_asio.cpp
@@ -0,0 +1 @@
+#include <boost/asio/impl/src.hpp>
\ No newline at end of file
-- 
2.43.0

Move the shared library build to the existing boost recipe, and allow enabling 
it with a PACKAGECONFIG
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