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Some output variables are preset by the Autoconf macros. Some of the
Autoconf macros set additional output variables, which are mentioned in
the descriptions for those macros. See section B.2 Output Variable Index, for a
complete list of output variables. See section 4.7.2 Installation Directory Variables, for the list of the preset ones related to installation
directories. Below are listed the other preset ones. They all are
precious variables (see section 7.2 Setting Output Variables,
AC_ARG_VAR).
configure runs, the default value is set
when you call AC_PROG_CC (or empty if you don't). configure
uses this variable when compiling programs to test for C features.
configure and giving the name of the input file.
AC_OUTPUT adds a comment line containing this variable to the top
of every `Makefile' it creates. For other files, you should
reference this variable in a comment at the top of each input file. For
example, an input shell script should begin like this:
#! /bin/sh # @configure_input@ |
The presence of that line also reminds people editing the file that it
needs to be processed by configure in order to be used.
configure runs, the default
value is empty. configure uses this variable when compiling or
preprocessing programs to test for C and C++ features.
configure runs, the default value is
set when you call AC_PROG_CXX (or empty if you don't).
configure uses this variable when compiling programs to test for
C++ features.
AC_CONFIG_HEADERS
is called, configure replaces `@DEFS@' with
`-DHAVE_CONFIG_H' instead (see section 4.8 Configuration Header Files). This
variable is not defined while configure is performing its tests,
only when creating the output files. See section 7.2 Setting Output Variables, for
how to check the results of previous tests.
echo for
question-answer message pairs? These variables provide a way:
echo $ECHO_N "And the winner is... $ECHO_C"
sleep 100000000000
echo "${ECHO_T}dead."
|
Some old and uncommon echo implementations offer no means to
achieve this, in which case ECHO_T is set to tab. You might not
want to use it.
configure runs, the default
value is set when you call AC_PROG_F77 (or empty if you don't).
configure uses this variable when compiling programs to test for
Fortran 77 features.
LIBS instead. If it is not set
in the environment when configure runs, the default value is empty.
configure uses this variable when linking programs to test for
C, C++ and Fortran 77 features.
configure uses this variable when linking
programs to test for C, C++ and Fortran 77 features.
builddir.
builddir.
top_builddir.
srcdir.
srcdir.
top_srcdir.
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