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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 compiler, 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, the tests fail. If the executables can't be run, and cross-compilation is not enabled, they fail too. See section 11. Manual Configuration, for more on support for cross compiling.
5.10.1 Specific Compiler Characteristics Some portability issues 5.10.2 Generic Compiler Characteristics Language independent tests 5.10.3 C Compiler Characteristics Checking its characteristics 5.10.4 C++ Compiler Characteristics Likewise 5.10.5 Fortran 77 Compiler Characteristics Likewise