cmake: Small cmake example

Signed-off-by: Torsten Rasmussen <torsten.rasmussen@nordicsemi.no>

Author: tejlmand

CMakeLists.txt

@@ -0,0 +1,40 @@
+
+project(CMakePlay C)
+
+############ app 1 ##############
+
+add_library(a1 STATIC a.c)
+target_link_libraries(a1 PUBLIC b1)
+
+add_library(b1 STATIC b.c)
+target_link_libraries(b1 PUBLIC c1)
+
+add_library(c1 STATIC c.c)
+
+add_executable(app1 main.c)
+target_link_libraries(app1 a1)
+
+
+############ app 2 ##############
+
+add_library(a2 STATIC a.c)
+target_link_libraries(a2 PUBLIC b2)
+
+add_library(b2 STATIC b.c)
+target_link_libraries(b2 PUBLIC c2)
+
+add_library(c2 STATIC c.c)
+
+add_executable(app2 main.c)
+target_link_libraries(app2 -Wl,--whole-archive a2 -Wl,--no-whole-archive)
+
+############ app 3 ##############
+
+add_library(a3 STATIC a.c)
+
+add_library(b3 STATIC b.c)
+
+add_library(c3 STATIC c.c)
+
+add_executable(app3 main.c)
+target_link_libraries(app3 -Wl,--whole-archive a3 b3 c3 -Wl,--no-whole-archive)

a.c

@@ -0,0 +1,7 @@
+int bb(int val);
+
+int aa(int val)
+{
+  return bb(val);
+}
+

b.c

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+int cc(int val);
+
+int bb(int val)
+{
+  return cc(val);
+}
+

c.c

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+
+int cc(int val)
+{
+  return val + 10;
+}
+

main.c

@@ -0,0 +1,6 @@
+int aa(int val);
+
+int main(void)
+{
+  return aa(2);
+}