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Environment Variables

You can change the behavior of ld with the environment variable GNUTARGET.

GNUTARGET determines the input-file object format if you don’t use -b (or its synonym, ‘-format’). Its value should be one of the BFD names for an input format (see BFD). If there is no GNUTARGET in the environment, l d uses the natural format of the target. If GNUTARGET is set to default , then BFD attempts to discover the input format by examining binary input files; this method often succeeds, but there are potential ambiguities, since there is no method of ensuring that the magic number used to specify object-file formats is unique. However, the configuration procedure for BFD on each system places the conventional format for that system first in the search-list, so ambiguities are resolved in favor of convention.