build error / user error?

[Andre Mermegas]

Hi All!

Anybody have a clue what I may have done wrong?

andmer@andmer-virtual-machine:~/projects/gilead_fix8/build$ cmake ..
-- Configuring done
-- Generating done
-- Build files have been written to: /home/andmer/projects/gilead_fix8/build
andmer@andmer-virtual-machine:~/projects/gilead_fix8/build$ make
[ 16%] Building CXX object CMakeFiles/gilead_fix8.dir/main.cpp.o
[ 33%] Linking CXX executable gilead_fix8
[ 33%] Built target gilead_fix8
[ 50%] Building CXX object gen/CMakeFiles/fix8_gen.dir/Myfix_classes.cpp.o
[ 66%] Building CXX object gen/CMakeFiles/fix8_gen.dir/Myfix_traits.cpp.o
[ 83%] Building CXX object gen/CMakeFiles/fix8_gen.dir/Myfix_types.cpp.o
[100%] Linking CXX executable fix8_gen
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
gen/CMakeFiles/fix8_gen.dir/build.make:159: recipe for target 'gen/fix8_gen' failed
make[2]: *** [gen/fix8_gen] Error 1
CMakeFiles/Makefile2:122: recipe for target 'gen/CMakeFiles/fix8_gen.dir/all' failed
make[1]: *** [gen/CMakeFiles/fix8_gen.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

[Ian McKane]

Who could know? We can't see your code, or your cmake makefiles. However I think the error 

(.text+0x20): undefined reference to `main'

is a strong clue.

/Ian

[Andre Mermegas]

thank you for the breadcrumbs!

C++ is not my primary domain and I clobbered up the cmake file for the fix8 gen portion. I had this line in there

add_executable(fix8_gen ${SOURCE_FILES})

and I had no cpp with main in that source tree.



One last thing is there a better way to add link in CMake?

# set the paths and libs
set(PREFIX      "/usr/local") # the directory containing "include" and "lib"
set(INCLUDE_DIR "${PREFIX}/include")
set(LIB_DIR     "${PREFIX}/lib")
set(LIBS
    "${LIB_DIR}/libfix8.so"
    "${LIB_DIR}/libhftest.so"
    "${LIB_DIR}/libmyfix.so"
    "${LIB_DIR}/libPocoFoundationd.so"
    "${LIB_DIR}/libPocoFoundation.so"
    "${LIB_DIR}/libPocoJSONd.so"
    "${LIB_DIR}/libPocoJSON.so"
    "${LIB_DIR}/libPocoNetd.so"
    "${LIB_DIR}/libPocoNet.so"
    "${LIB_DIR}/libPocoUtild.so"
    "${LIB_DIR}/libPocoUtil.so"
    "${LIB_DIR}/libPocoXMLd.so"
    "${LIB_DIR}/libPocoXML.so"
    )

[Andre Mermegas]

I'm pretty sure I have all the fix8 libs included,
almost compiled, getting this now any idea what lib i could be missing in my cmake?

I have

    "${LIB_DIR}/libfix8.so"
    "${LIB_DIR}/libhftest.so"
    "${LIB_DIR}/libmyfix.so"

CMakeFiles/gilead_fix8.dir/main.cpp.o: In function `FIX8::SessionConfig::SessionConfig(FIX8::F8MetaCntx const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
/home/andmer/projects/gilead_fix8/main.cpp:(.text._ZN4FIX813SessionConfigC2ERKNS_10F8MetaCntxERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESB_[_ZN4FIX813SessionConfigC2ERKNS_10F8MetaCntxERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESB_]+0x35c): undefined reference to `FIX8::Configuration::create_clients(XmlElement const*) const'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[Mazz Barker]

create_clients is found in configuration.cpp. This is not being linked in.

You need to attach your CMakeLists.txt (s) if you want us to help you 

Mazz 

[Andre Mermegas]

Yeah your right, here is my test project for reference:
https://github.com/andmer/fix8.git

I have included
#include <fix8/f8includes.hpp>
so it does pull in configuration.hpp header, there is some error on linkage I can not figure out why.

please take a look at the cmake if you get a chance, thanks.

[Andre Mermegas]

turns out to be clang 3.8 problem?
clang version 3.8.0-2ubuntu3 (tags/RELEASE_380/final)

i swapped to g++ 5.3 and it links correctly now.
g++ (Ubuntu 5.3.1-14ubuntu2) 5.3.1 20160413

I don't know why, but for informational purposes it is what occurred for me.

[Ian McKane]

I've used clang previously but not for a while. You should raise an issue in Jira as the project maintainers will want to fix this.

/Ian