How to compile as static .a file?

[Marcel]

I am not too deep into C, but I would like to consume this API and integrate it as a static library (.a) instead of a shared object (.so). How to achieve this?

[Hui Yu]

Patch the following code to "kubernetes/CMakeLists.txt"

diff --git a/kubernetes/CMakeLists.txt b/kubernetes/CMakeLists.txt
index 592c445..9f65ff8 100644
--- a/kubernetes/CMakeLists.txt
+++ b/kubernetes/CMakeLists.txt
@@ -1302,7 +1302,7 @@ include(PreTarget.cmake OPTIONAL)
 set(PROJECT_VERSION_STRING "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}")

 # Add library with project file with project name as library name
-add_library(${pkgName} ${SRCS} ${HDRS})
+add_library(${pkgName} STATIC ${SRCS} ${HDRS})
 # Link dependent libraries
 if(NOT CMAKE_VERSION VERSION_LESS 3.4)
     target_link_libraries(${pkgName} PRIVATE OpenSSL::SSL OpenSSL::Crypto)

[Marcel]

OK, that worked, I got a libkubernetes.a file now. Unfortunately, when I try to include it in a binary and build that one, I get:

/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_f_base64'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_new'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_s_mem'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_new'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_push'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_set_flags'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_write'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_ctrl'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_ctrl'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_ctrl'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BIO_free_all'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64encode: error: undefined reference to 'BUF_MEM_grow'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_f_base64'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_new'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_s_mem'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_new'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_write'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_push'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_set_flags'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_read'
/tmp/included5619073151443731897/libkubernetes.a(binary.c.o):binary.c:function base64decode: error: undefined reference to 'BIO_free_all'

I know, this is some special case because I try to include it in a Kotlin Native build. So far the native build works fine wit the shared object files, but I'd like to not rely on them because they are manually compiled.

So, maybe I am just missing something. If this is something where you could point me to the right directions, I'd appreciate it.

[Hui Yu]

The error message shows that libkubernetes.a cannot obtain the dependency of libssl.
Try including the OpenSSL library (e.g. libssl.a) in your binary.

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