System Services

The following macros check for operating system services or capabilities.

Macro: AC_CYGWIN

Checks for the Cygwin environment. If present, sets shell variable CYGWIN to `yes'. If not present, sets CYGWIN to the empty string.

Macro: AC_EXEEXT

Defines substitute variable EXEEXT based on the output of the compiler, after .c, .o, and .obj files have been excluded. Typically set to empty string if Unix, `.exe' or `.EXE' if Win32.

Macro: AC_OBJEXT

Defines substitute variable OBJEXT based on the output of the compiler, after .c files have been excluded. Typically set to `.o' if Unix, `.obj' if Win32.

Macro: AC_MINGW32

Checks for the MingW32 compiler environment. If present, sets shell variable MINGW32 to `yes'. If not present, sets MINGW32 to the empty string.

Macro: AC_PATH_X

Try to locate the X Window System include files and libraries. If the user gave the command line options `--x-includes=dir' and `--x-libraries=dir', use those directories. If either or both were not given, get the missing values by running xmkmf on a trivial `Imakefile' and examining the `Makefile' that it produces. If that fails (such as if xmkmf is not present), look for them in several directories where they often reside. If either method is successful, set the shell variables x_includes and x_libraries to their locations, unless they are in directories the compiler searches by default.

If both methods fail, or the user gave the command line option `--without-x', set the shell variable no_x to `yes'; otherwise set it to the empty string.

Macro: AC_PATH_XTRA

An enhanced version of AC_PATH_X. It adds the C compiler flags that X needs to output variable X_CFLAGS, and the X linker flags to X_LIBS. If X is not available, adds `-DX_DISPLAY_MISSING' to X_CFLAGS.

This macro also checks for special libraries that some systems need in order to compile X programs. It adds any that the system needs to output variable X_EXTRA_LIBS. And it checks for special X11R6 libraries that need to be linked with before `-lX11', and adds any found to the output variable X_PRE_LIBS.

Macro: AC_SYS_INTERPRETER

Check whether the system supports starting scripts with a line of the form `#! /bin/csh' to select the interpreter to use for the script. After running this macro, shell code in configure.in can check the shell variable interpval; it will be set to `yes' if the system supports `#!', `no' if not.

Macro: AC_SYS_LONG_FILE_NAMES

If the system supports file names longer than 14 characters, define HAVE_LONG_FILE_NAMES.

Macro: AC_SYS_RESTARTABLE_SYSCALLS

If the system automatically restarts a system call that is interrupted by a signal, define HAVE_RESTARTABLE_SYSCALLS.

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