Hello.
Is it possible to dynamically create output variables using AC_SUBST or some other means? The reason that I ask is because I am considering the idea of setting up a master configuration file for a project which I am working on. This master configuration file will contain a number of settings which are stored as key-value pairs. I then want to use AC_SUBST, or some other mechanism to make these key-value pairs available to output files when they are generated by AC_OUTPUT.
I have written a test Autoconf macro to try this out, but it doesn't work for me the way I expected. The problem is with the AC_SUBST command. My test macro is implemented as follows ;
AC_DEFUN([FOO_PROCESS_SETTINGS],
[
# Settings should be stored in the configuration file
# as key-value pairs, e.g. ;
#
# PROJECT_NAME = foo
while read line
do
# Extract the key from the string.
key=$(echo ${line} | sed -e 's/ =.*//g')
# Extract the value from the string.
value=$(echo ${line} | sed -e 's/.*= //g')
AC_MSG_NOTICE("---> ${NAME_MACRO} : ${key} -> ${value}")
# The following line of code doesn't work as intended.
AC_SUBST([${key}], [${value}])
done < ./project-settings.conf
])
When I examine the configure file which is produced by Autoconf, it contains the following line ;
${key} = ${value}
which I assume was generated from the call to the AC_SUBST macro in my own macro.
Can I maybe accomplish this task by using some m4 code embedded into my macro? I have also considered using the AC_SUBST_FILE macro as well, but I don't think that this is going to work for me either.
Any help or pointers on this matter would be greatly appreciated.
Thankyou.
- Craig Sanders
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