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README: configure.in -> configure.ac 

These files were renamed from that long deprecated name in commit
92061799.
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Jon Turney 2021-12-08 15:40:59 +00:00
parent 90950758eb
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@ -545,14 +545,14 @@ $(source_dir)/src/configure --with-newlib --prefix=$(install_dir) --disable-shar
Regenerating Configuration Files Regenerating Configuration Files
================================ ================================
At times you will need to make changes to configure.in and Makefile.am files. At times you will need to make changes to configure.ac and Makefile.am files.
This will mean that configure and Makefile.in files will need to be This will mean that configure and Makefile.in files will need to be
regenerated. regenerated.
At the top level of newlib is the file: acinclude.m4. This file contains At the top level of newlib is the file: acinclude.m4. This file contains
the definition of the NEWLIB_CONFIGURE macro which is used by all configure.in the definition of the NEWLIB_CONFIGURE macro which is used by all configure.ac
files in newlib. You will notice that each directory in newlib containing files in newlib. You will notice that each directory in newlib containing
a configure.in file also contains an aclocal.m4 file. This file is a configure.ac file also contains an aclocal.m4 file. This file is
generated by issuing: aclocal -I${relative_path_to_toplevel_newlib_dir} generated by issuing: aclocal -I${relative_path_to_toplevel_newlib_dir}
-I${relative_path_to_toplevel_src_dir} -I${relative_path_to_toplevel_src_dir}
The first relative directory is to access acinclude.m4. The second relative The first relative directory is to access acinclude.m4. The second relative
@ -566,7 +566,7 @@ Note that if the top level acinclude.m4 is altered, every aclocal.m4 file
in newlib should be regenerated. in newlib should be regenerated.
If the aclocal.m4 file is regenerated due to a change in acinclude.m4 or If the aclocal.m4 file is regenerated due to a change in acinclude.m4 or
if a configure.in file is modified, the corresponding configure file in the if a configure.ac file is modified, the corresponding configure file in the
directory must be regenerated using autoconf. No parameters are necessary. directory must be regenerated using autoconf. No parameters are necessary.
In the previous example, we would issue: In the previous example, we would issue:
@ -581,12 +581,12 @@ files in newlib (and libgloss) are generated using the --cygnus option
of automake. of automake.
Makefile.in files are generated from the nearest directory up the chain Makefile.in files are generated from the nearest directory up the chain
which contains a configure.in file. In most cases, this is the same which contains a configure.ac file. In most cases, this is the same
directory containing configure.in, but there are exceptions. directory containing configure.ac, but there are exceptions.
For example, the newlib/libc directory has a number of For example, the newlib/libc directory has a number of
subdirectories that do not contain their own configure.in files (e.g. stdio). subdirectories that do not contain their own configure.ac files (e.g. stdio).
For these directories, you must issue the automake command from newlib/libc For these directories, you must issue the automake command from newlib/libc
which is the nearest parent directory that contains a configure.in. which is the nearest parent directory that contains a configure.ac.
When you issue the automake command, you specify the subdirectory for When you issue the automake command, you specify the subdirectory for
the Makefile.in you are regenerating. For example: the Makefile.in you are regenerating. For example:
@ -594,13 +594,13 @@ the Makefile.in you are regenerating. For example:
Note how multiple Makefile.in files can be created in the same step. You Note how multiple Makefile.in files can be created in the same step. You
would not specify machine/Makefile or sys/Makefile in the previous example would not specify machine/Makefile or sys/Makefile in the previous example
because both of these subdirectories contain their own configure.in files. because both of these subdirectories contain their own configure.ac files.
One would change to each of these subdirectories and in turn issue: One would change to each of these subdirectories and in turn issue:
automake --cygnus Makefile automake --cygnus Makefile
Let's say you create a new machine directory XXXX off of newlib/libc/machine. Let's say you create a new machine directory XXXX off of newlib/libc/machine.
After creating a new configure.in and Makefile.am file, you would issue: After creating a new configure.ac and Makefile.am file, you would issue:
aclocal -I ../../.. aclocal -I ../../..
autoconf autoconf