(automake.info.gz) Program variables

 
 Variables used when building a program
 ======================================
 
    Occasionally it is useful to know which `Makefile' variables
 Automake uses for compilations; for instance you might need to do your
 own compilation in some special cases.
 
    Some variables are inherited from Autoconf; these are `CC',
 `CFLAGS', `CPPFLAGS', `DEFS', `LDFLAGS', and `LIBS'.
 
    There are some additional variables which Automake itself defines:
 
 `AM_CPPFLAGS'
      The contents of this variable are passed to every compilation
      which invokes the C preprocessor; it is a list of arguments to the
      preprocessor.  For instance, `-I' and `-D' options should be
      listed here.
 
      Automake already provides some `-I' options automatically.  In
      particular it generates `-I$(srcdir)', `-I.', and a `-I' pointing
      to the directory holding `config.h' (if you've used
      `AC_CONFIG_HEADERS' or `AM_CONFIG_HEADER').  You can disable the
      default `-I' options using the `nostdinc' option.
 
      `AM_CPPFLAGS' is ignored in preference to a per-executable (or
      per-library) `_CPPFLAGS' variable if it is defined.
 
 `INCLUDES'
      This does the same job as `AM_CPPFLAGS'.  It is an older name for
      the same functionality.  This variable is deprecated; we suggest
      using `AM_CPPFLAGS' instead.
 
 `AM_CFLAGS'
      This is the variable which the `Makefile.am' author can use to pass
      in additional C compiler flags.  It is more fully documented
      elsewhere.  In some situations, this is not used, in preference to
      the per-executable (or per-library) `_CFLAGS'.
 
 `COMPILE'
      This is the command used to actually compile a C source file.  The
      filename is appended to form the complete command line.
 
 `AM_LDFLAGS'
      This is the variable which the `Makefile.am' author can use to pass
      in additional linker flags.  In some situations, this is not used,
      in preference to the per-executable (or per-library) `_LDFLAGS'.
 
 `LINK'
      This is the command used to actually link a C program.  It already
      includes `-o $@' and the usual variable references (for instance,
      `CFLAGS'); it takes as "arguments" the names of the object files
      and libraries to link in.
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