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Chapter 5 UNIX Compiler/Linker Issues
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National Instruments Corporation 5-3 LabWindows/CVI Programmer Reference Manual
Creating Executables that Use the
LabWindows/CVI Libraries
You can build executables that use the LabWindows/CVI libraries in two ways:
• You can build an executable in the LabWindows/CVI development environment by
selecting the Create Standalone Executable command in the Build menu of the Project
window. When you do so, LabWindows/CVI invokes the Sun Solaris linker (
ld) to link
your programs to the Run-time Engine shared library.
• You can use an external compiler and linker to create an executable that uses the
Run-time Engine shared library. Use the Generate Makefile command in the Build menu
of the Project window to generate a UNIX makefile that corresponds to the currently
loaded project and libraries. The makefile invokes an external compiler to compile your
source files, and then it invokes the Sun Solaris linker (
ld) to link the compiled files with
the Run-time Engine shared library.
Compatible External Compilers
You can use the following external ANSI C compilers to compile source files for linking with
the LabWindows/CVI Run-time Engine shared library.
• GNU C Compiler (
gcc)
• Sun C Compiler (
cc and acc)
Note
Under Solaris 2.4, when linking the LabWindows/CVI Shared Library with
external ANSI C compiler, the compiler displays a warning that states the shared
library has an invalid type. You can ignore this warning.
Static and Shared Versions of the ANSI C and Other Sun Libraries
When you build a project for execution in the LabWindows/CVI development environment,
LabWindows/CVI links your program to the static versions of the Sun Solaris libraries
(
libc.a and libm.a). On the other hand, when you create a standalone executable in the
LabWindows/CVI development environment, LabWindows/CVI invokes the Sun Solaris link
editor (
ld) to link your program to the shared versions of the libraries (libc.so and
libm.so). Similarly, when you generate a UNIX makefile by invoking the Generate
Makefile command from the Build Menu of the Project window, the makefile contains linker
commands to use the shared versions of the libraries.
Thus, when you run your programs as executables, you use a different version of the Sun
libraries (including the ANSI C library) than when you run them in the LabWindows/CVI
development environment. Your program might exhibit slightly different behavior as a
standalone executable than when run in the development environment.
00ProRef.book : 06chap05.fm Page 3 Monday, March 9, 1998 3:23 PM