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automake-1.16: Standard Configuration Variables

 
 2.2.4 Standard Configuration Variables
 --------------------------------------
 
 The GNU Coding Standards also define a set of standard configuration
 variables used during the build.  Here are some:
 
 ‘CC’
      C compiler command
 ‘CFLAGS’
      C compiler flags
 ‘CXX’
      C++ compiler command
 ‘CXXFLAGS’
      C++ compiler flags
 ‘LDFLAGS’
      linker flags
 ‘CPPFLAGS’
      C/C++ preprocessor flags
 ...
 
    ‘configure’ usually does a good job at setting appropriate values for
 these variables, but there are cases where you may want to override
 them.  For instance you may have several versions of a compiler
 installed and would like to use another one, you may have header files
 installed outside the default search path of the compiler, or even
 libraries out of the way of the linker.
 
    Here is how one would call ‘configure’ to force it to use ‘gcc-3’ as
 C compiler, use header files from ‘~/usr/include’ when compiling, and
 libraries from ‘~/usr/lib’ when linking.
 
      ~/amhello-1.0 % ./configure --prefix ~/usr CC=gcc-3 \
      CPPFLAGS=-I$HOME/usr/include LDFLAGS=-L$HOME/usr/lib
 
    Again, a full list of these variables appears in the output of
 ‘./configure --help’.
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