Default Behavior of the Compiler

If you do not specify any options when you invoke the Intel® C++ Compiler, the compiler uses the following default settings:

• Produces executable output with filename a.o.
• Invokes options specified in a configuration file first. See Configuration Files.
• Searches for library files in directories specified by the LD_LIBRARY_PATH variable, if they are not found in the current directory.
• Sets 8 bytes as the strictest alignment constraint for structures.
• Displays error and warning messages.
• Performs standard optimizations using the default -O2 option. See Setting Optimization Levels.

If the compiler does not recognize a command-line option, that option is ignored and a warning is displayed. See Diagnostic Messages for detailed descriptions about system messages.