Compiler setting in Eclipse for Linux RT

[veryfatz]

Hi All

I have 2 PC, the one is Windows, the another is NI Linux RT on PXI system

I want to create compilation environment using Eclipse 2017 on Windows

so i followed NI tutorial: Getting Started with C/C++ Development Tools for NI Linux Real-Time, Eclipse Edition. 

and i get the following errors:

cannot find crt1.o: No such file or directory
cannot find crti.o: No such file or directory
cannot find crtbegin.o: No such file or directory
cannot find /lib/libc.so.6
cannot find /usr/lib/libc_nonshared.a
cannot find /lib/ld-linux-x86-64.so.2

I can find these files and i set path in "include or library path" in Eclipse,

but still not workout.

any ideas?

 

    

[rolfk]

Crosscompilation in Eclipse/GCC should not need to add the target include and library paths  to your project. Instead you need to configure the Cross Settings->Prefix correctly. The Prefix is basically the name of your cross compilation target and there should be an according directory on your harddisk, most probably x86_64-nilrt-linux- from the paths you show. (And yes the hyphen at the end of that prefix name is important!)

[veryfatz]

Hi rolfk,

Thanks for your reply.

My Cross Complier settings which according NI tutorial,

Prefix:x86_64-nilrt-linux-

Path:c:/build/17.0/x64/sysroots/i686-nilrtsdk-mingw32/usr/bin/x86_64-nilrt-linux

but it's not work, console still show error that ld.exe cannot find library

like this

------------------------------------------------------------------------------------------------------------------------------

c:/build/17.0/x64/sysroots/i686-nilrtsdk-mingw32/usr/bin/x86_64-nilrt-linux/../../libexec/x86_64-nilrt-linux/gcc

   /x86_64-nilrt-linux/4.9.2/ld.exe: cannot find crt1.o: No such file or directory
c:/build/17.0/x64/sysroots/i686-nilrtsdk-mingw32/usr/bin/x86_64-nilrt-linux/../../libexec/x86_64-nilrt-linux/gcc

   /x86_64-nilrt-linux/4.9.2/ld.exe: cannot find crti.o: No such file or directory
c:/build/17.0/x64/sysroots/i686-nilrtsdk-mingw32/usr/bin/x86_64-nilrt-linux/../../libexec/x86_64-nilrt-linux/gcc

   /x86_64-nilrt-linux/4.9.2/ld.exe: cannot find crtbegin.o: No such file or directory
c:/build/17.0/x64/sysroots/i686-nilrtsdk-mingw32/usr/bin/x86_64-nilrt-linux/../../libexec/x86_64-nilrt-linux/gcc

    /x86_64-nilrt-linux/4.9.2/ld.exe: cannot find /lib/libc.so.6
c:/build/17.0/x64/sysroots/i686-nilrtsdk-mingw32/usr/bin/x86_64-nilrt-linux/../../libexec/x86_64-nilrt-linux/gcc

   /x86_64-nilrt-linux/4.9.2/ld.exe: cannot find /usr/lib/libc_nonshared.a
c:/build/17.0/x64/sysroots/i686-nilrtsdk-mingw32/usr/bin/x86_64-nilrt-linux/../../libexec/x86_64-nilrt-linux/gcc

   /x86_64-nilrt-linux/4.9.2/ld.exe: cannot find /lib/ld-linux-x86-64.so.2

------------------------------------------------------------------------------------------------------------------------------

i can't figure out...

[ndo]

Any luck on this? I'm seeing a similar problem.

[ndo]

A Google search came up with an obscure linker flag (-lm) that fixed my problem what added.  Good luck.

[rolfk]

---

@ndo wrote:

A Google search came up with an obscure linker flag (-lm) that fixed my problem what added.  Good luck.

---

That’s not obscure at all. The -l flag tells the gcc linker to search for a library or object file with the name “lib<expression following the l flag>.a/obj”

libm.a is the standard library containing mathematic functions such as fmax, fmin, fmod, sqrt, etc. If you use any standard C library function in your code you must make sure to add the according linker library flag to include the necessary library to your make command.

[ndo]

LOL! Yes.  I came to realize that.  I was including libc expecting the math.h functions to be in there for some reason.

--ndo

[rolfk]

---

@ndo wrote:

LOL! Yes.  I came to realize that.  I was including libc expecting the math.h functions to be in there for some reason.

---

Nobody ever said that the whole standard C library with its header mess and separation into different libraries was particularly well designed. 😁

Instead it is, over the course of 40 years, an organically grown mess that can't be untangled at this time anymore without sacrificing backwards compatibility.