Re: [sr #111014] autoheader doesn't work with AC_DEFINE_UNQUOTED

On 2024-01-30 21:47, anonymous wrote:
> If you use AC_DEFINE_UNQUOTED to define symbols whose names are
> expanded from variables, autoheader won't emit them to the template
> header file. Later when you run configure, these symbols won't get
> defined because the matching define/undef line that is looked for
> during substitution doesn't exist.

Autoheader can't possibly know in advance what text some arbitrary
shell expansion might contain when the configure script is executed.
So, as documented[1], it only works when the first argument to
AC_DEFINE_UNQUOTED is a "literal" (essentially, something that
looks like it will be unchanged by shell quotation).

You can use AH_TEMPLATE[2] to instruct autoheader about any template
lines that it should include which are not determined automatically.

[1] https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.72/autoconf.html#autoheader-Invocation
[2] https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.72/autoconf.html#Autoheader-Macros

Hope that helps,
  Nick