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(autoconf.info)Compilers and Preprocessors

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Compilers and Preprocessors
===========================

   All the tests for compilers (`AC_PROG_CC', `AC_PROG_CXX',
`AC_PROG_F77') define the output variable `EXEEXT' based on the output
of the 1compiler, typically to the empty string if Unix and `.exe' if
Win32 or OS/2.

   They also define the output variable `OBJEXT' based on the output of
the compiler, after .c files have been excluded, typically to `o' if
Unix, `obj' if Win32.

   If the compiler being used does not produce executables, they fail.
If the executables can't be run, and cross-compilation is not enabled,
they fail too.  Note: Manual Configuration, for more on support for
cross compiling.

Specific Compiler Characteristics

Some portability issues

Generic Compiler Characteristics

Language independent tests

C Compiler

Checking its characteristics

C++ Compiler

Likewise

Fortran 77 Compiler

Likewise