CMAKE no rule to make target for internal shared library - c

Question

I wrote a cmake file that builds two shared library a vector3.c and a matrix4.c
The matrix4 depends on the vector3, if I run my cmake project and only build the vector3 shared library it builds just fine, when I add the matrix4 shared library I get a cmake error. No rule to make target.
The folder structure
core_math
------CMakeLists.txt
-common/
------common_structs.h
-matrix4/
------CMakeLists.txt
------matrix4/src/matrix4_scalar.c
------matrix4/headers/matrix4_scalar.h
-vector3/
-------CMakeLists.txt
-------vector3/src/vector3_scalar.c
-------vector3/headers/vector3_scalar.h
core_math/CMakeLists.txt
PROJECT(core_math)
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
ADD_SUBDIRECTORY(vector3_scalar)
ADD_SUBDIRECTORY(matrix4_scalar)
SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY $(CMAKE_BINARY_DIR)/static_lib)
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY $(CMAKE_BINARY_DIR)/shared_lib)
SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY $(CMAKE_BINARY_DIR)/bin)
SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake_modules)
core_math/vector3/CMakeLists.txt
PROJECT(vector3_scalar)
SET(CMAKE_MACOSX_RPATH 1)
INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/../common)
SET(HEADER_FILES ${CMAKE_CURRENT_SOURCE_DIR}/../common/common_structs.h)
SET(SRC_FILES ${CMAKE_CURRENT_SOURCE_DIR}/src/vector3_scalar.c ${HEADER_FILES})
ADD_LIBRARY(vector3_scalar SHARED ${SRC_FILES})
core_math/matrix4_scalar/CMakeLists.txt
PROJECT(matrix4_scalar)
SET(CMAKE_MACOSX_RPATH 1)
INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/../common
${CMAKE_CURRENT_SOURCE_DIR}/../vector3_scalar)
SET(HEADER_FILES ${CMAKE_CURRENT_SOURCE_DIR}/../common/common_structs.h
${CMAKE_CURRENT_SOURCE_DIR}/../vector3_scalar/headers/vector3_scalar.h
${CMAKE_CURRENT_SOURCE_DIR}/headers/matrix4_scalar.h)
SET(SRC_FILES ${CMAKE_CURRENT_SOURCE_DIR}/src/matrix4_scalar.c ${HEADER_FILES})
ADD_LIBRARY(matrix4_scalar SHARED ${SRC_FILES})
TARGET_LINK_LIBRARIES(matrix4_scalar vector3_scalar)
build error
-- Build files have been written to: /Users/blubee/MATH/project/build
Scanning dependencies of target vector3_scalar
[ 25%] Building C object source/core_math/vector3_scalar/CMakeFiles/vector3_scalar.dir/sr
c/vector3_scalar.c.o
[ 50%] Linking C shared library $(CMAKE_BINARY_DIR)/lib/libvector3_scalar.dylib
[ 50%] Built target vector3_scalar
Scanning dependencies of target matrix4_scalar
[ 75%] Building C object source/core_math/matrix4_scalar/CMakeFiles/matrix4_scalar.dir/sr
c/matrix4_scalar.c.o
make[2]: *** No rule to make target `source/core_math/vector3_scalar//Users/blubee/MATH/pr
oject/build/lib/libvector3_scalar.dylib', needed by `source/core_math/matrix4_scalar//Use
rs/blubee/MATH/project/build/lib/libmatrix4_scalar.dylib'. Stop.
make[1]: *** [source/core_math/matrix4_scalar/CMakeFiles/matrix4_scalar.dir/all] Error 2
make: *** [all] Error 2
if I remove the target_link_libraries from the matrix4_scalar cmakelists.txt file then I get undefined symbols error instead.
Undefined symbols for architecture x86_64:
"_vec3_deg2rad", referenced from:
_mat4_rotate in matrix4_scalar.c.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [source/core_math/matrix4_scalar//Users/blubee/MATH/project/build/lib/libmatr
ix4_scalar.dylib] Error 1
make[1]: *** [source/core_math/matrix4_scalar/CMakeFiles/matrix4_scalar.dir/all] Error 2
make: *** [all] Error 2

Answer 1

I have done some testing with your code and could reproduce the problem.
It's related to having used $(...) brackets for variable dereferencing in the SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY ...) command. I've changed $(CMAKE_BINARY_DIR) to ${CMAKE_BINARY_DIR} and everything works fine:
> cmake --build .
-- Configuring done
-- Generating done
-- Build files have been written to: build
Scanning dependencies of target vector3_scalar
[ 25%] Building C object vector3_scalar/CMakeFiles/vector3_scalar.dir/src/vector3_scalar.c.o
[ 50%] Linking C shared library ../shared_lib/libvector3_scalar.dylib
[ 50%] Built target vector3_scalar
Scanning dependencies of target matrix4_scalar
[ 75%] Building C object matrix4_scalar/CMakeFiles/matrix4_scalar.dir/src/matrix4_scalar.c.o
[100%] Linking C shared library ../shared_lib/libmatrix4_scalar.dylib
[100%] Built target matrix4_scalar
References
CMake Error at CMakeLists.txt:30 (project): No CMAKE_C_COMPILER could be found
What's the CMake syntax to set and use variables?
[CMake] Trouble setting LIBRARY_OUTPUT_DIRECTORY
Custom Directory for CMake Library Output