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autoconf: modernize and modularize

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Use my modular m4 library used for other things as well; update
autoconf macros to 2.71 standard.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2024-06-10 18:24:53 -07:00
parent 33051a296c
commit fefaa2cc5c
35 changed files with 680 additions and 461 deletions
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16
autoconf/m4/pa_build_ifelse.m4 Normal file
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@ -0,0 +1,16 @@
dnl --------------------------------------------------------------------------
dnl PA_BUILD_IFELSE(input [,success [,failure]])
dnl
dnl Same as AC_LINK_IFELSE for languages where linking is applicable,
dnl otherwise AC_COMPILE_IFELSE.
dnl
dnl If the first argument is empty, use _AC_LANG_IO_PROGRAM.
dnl --------------------------------------------------------------------------
m4_defun([_PA_BUILD_IFELSE],
[m4_case(_AC_LANG,
[Erlang], [AC_COMPILE_IFELSE($@)],
[AC_LINK_IFELSE($@)])])
AC_DEFUN([PA_BUILD_IFELSE],
[_PA_BUILD_IFELSE([m4_ifblank([$1],[AC_LANG_SOURCE(_AC_LANG_IO_PROGRAM)],
[$1])],[$2],[$3])])