chore: clean up build scripts

* remove checks that we do not use
* autoconf-archive is now mandatory

configure.ac

@@ -19,15 +19,11 @@ LT_INIT([dlopen])
 
 # -- Checks for programs --
 
-AC_PROG_AWK
 AC_PROG_CC
 AC_PROG_CPP
 AC_PROG_CXX
 AC_PROG_INSTALL
-AC_PROG_LN_S
 AC_PROG_MAKE_SET
-AC_PROG_MKDIR_P
-AC_PROG_SED
 
 # -- Checks for libraries --
 
@@ -70,25 +66,10 @@ AM_CONDITIONAL([BUILD_ARIFY], [test x${enable_arify} != xno])
 
 # -- Checks for compiler builtins and attributes --
 
-ARIF_TRY_APPLY([AX_GCC_BUILTIN], [__builtin_unreachable])
-ARIF_TRY_APPLY([AX_GCC_FUNC_ATTRIBUTE], [constructor], [destructor])
-ARIF_TRY_APPLY([AX_GCC_VAR_ATTRIBUTE], [unused])
-
-# -- Checks for header files --
-
-AC_CHECK_HEADERS([fcntl.h strings.h unistd.h])
-
-# -- Checks for typedefs, structures, and compiler characteristics --
-
-AC_CHECK_HEADER_STDBOOL
-AC_C_INLINE
-AC_TYPE_SIZE_T
-
-# -- Checks for library functions
-
-AC_FUNC_MALLOC
-AC_FUNC_REALLOC
-AC_CHECK_FUNCS([atexit memchr strcasecmp])
+AX_GCC_BUILTIN([__builtin_unreachable])
+AX_GCC_FUNC_ATTRIBUTE([constructor])
+AX_GCC_FUNC_ATTRIBUTE([destructor])
+AX_GCC_VAR_ATTRIBUTE([unused])
 
 # -- Output --
 

m4/arif_ac.m4

@@ -33,7 +33,6 @@ AC_DEFUN([ARIF_ARG_ENABLE], [
     m4_popdef([enable_var_])
 ])
 
-
 dnl
 dnl  ARIF_CHECK_PKG(package, version, package-name, [action-if-not-given],
 dnl                 [action-if-with], [action-if-without])
@@ -58,15 +57,3 @@ AC_DEFUN([ARIF_CHECK_PKG], [
     ])
     m4_popdef([with_var_])
 ])
-
-dnl
-dnl  ARIF_TRY_APPLY(macro-name, ...)
-dnl
-dnl  If `macro-name' is defined, for each remaining argument,
-dnl  applies the macro to that argument.
-dnl
-AC_DEFUN([ARIF_TRY_APPLY], [
-    m4_ifdef([$1], [
-        m4_foreach([val_], [m4_shift($@)], [$1(val_)])
-    ])
-])