SCons User Guide 0.97
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How is SCons Constructing the Command Lines It Executes? the --debug=presub Option

Sometimes it's useful to look at the pre-substitution string that SCons uses to generate the command lines it executes. This can be done with the --debug=presub option: 

      % scons -Q --debug=presub
      Building prog.o with action:
        $CC -o $TARGET -c $CFLAGS $CCFLAGS $_CCOMCOM $SOURCES
      cc -o prog.o -c -I. prog.c
      Building prog with action:
        $SMART_LINKCOM
      cc -o prog prog.o
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What Dependencies Does SCons Know About? the --tree OptionUpWhere is SCons Searching for Libraries? the --debug=findlibs Option