(autocf21.info.gz) Language Choice

 
 5.8 Language Choice
 ===================
 
 Packages that use both C and C++ need to test features of both
 compilers.  Autoconf-generated `configure' scripts check for C features
 by default.  The following macros determine which language's compiler
 is used in tests that follow in `configure.in'.
 
  -- Macro: AC_LANG_C
      Do compilation tests using `CC' and `CPP' and use extension `.c'
      for test programs.  Set the shell variable `cross_compiling' to
      the value computed by `AC_PROG_CC' if it has been run, empty
      otherwise.
 
  -- Macro: AC_LANG_CPLUSPLUS
      Do compilation tests using `CXX' and `CXXCPP' and use extension
      `.C' for test programs.  Set the shell variable `cross_compiling'
      to the value computed by `AC_PROG_CXX' if it has been run, empty
      otherwise.
 
  -- Macro: AC_LANG_FORTRAN77
      Do compilation tests using `F77' and use extension `.f' for test
      programs.  Set the shell variable `cross_compiling' to the value
      computed by `AC_PROG_F77' if it has been run, empty otherwise.
 
  -- Macro: AC_LANG_SAVE
      Remember the current language (as set by `AC_LANG_C',
      `AC_LANG_CPLUSPLUS' or `AC_LANG_FORTRAN77') on a stack.  Does not
      change which language is current.  Use this macro and
      `AC_LANG_RESTORE' in macros that need to temporarily switch to a
      particular language.
 
  -- Macro: AC_LANG_RESTORE
      Select the language that is saved on the top of the stack, as set
      by `AC_LANG_SAVE', and remove it from the stack.  This macro is
      equivalent to either `AC_LANG_C', `AC_LANG_CPLUSPLUS' or
      `AC_LANG_FORTRAN77', whichever had been run most recently when
      `AC_LANG_SAVE' was last called.
 
      Do not call this macro more times than `AC_LANG_SAVE'.
 
  -- Macro: AC_REQUIRE_CPP
      Ensure that whichever preprocessor would currently be used for
      Macros::) with an argument of either `AC_PROG_CPP' or
      `AC_PROG_CXXCPP', depending on which language is current.
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