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All the tests for compilers (
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, they 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 Generic Compiler Characteristics Language independent tests 5.10.2 C Compiler Characteristics Checking its characteristics 5.10.3 C++ Compiler Characteristics Likewise 5.10.4 Fortran 77 Compiler Characteristics Likewise