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-rw-r--r--m4/sd_check_max_int_size.m427
1 files changed, 27 insertions, 0 deletions
diff --git a/m4/sd_check_max_int_size.m4 b/m4/sd_check_max_int_size.m4
new file mode 100644
index 0000000000..a4230b5ee8
--- /dev/null
+++ b/m4/sd_check_max_int_size.m4
@@ -0,0 +1,27 @@
+dnl Find what INT_MAX define to use for a type
+
+#serial 1
+
+ifdef([AC_TR_SH],[], [
+define([AC_TR_SH],
+ [patsubst(translit([[$1]], [*+], [pp]), [[^a-zA-Z0-9_]], [_])])
+define([AC_TR_CPP],
+ [patsubst(translit([[$1]],
+ [*abcdefghijklmnopqrstuvwxyz],
+ [PABCDEFGHIJKLMNOPQRSTUVWXYZ]),
+ [[^A-Z0-9_]], [_])])
+])
+
+AC_DEFUN([SD_CHECK_MAX_INT_SIZE],
+ [AC_CHECK_SIZEOF([long],,)
+ AC_CHECK_SIZEOF([long long],,)
+ AC_CHECK_SIZEOF([$1],,[$2])
+ AS_CASE([$ac_cv_sizeof_[]AC_TR_SH($1)],
+ [$ac_cv_sizeof_long], [sd_type_max=LONG_MAX],
+ [$ac_cv_sizeof_long_long], [sd_type_max=LONG_LONG_MAX],
+ [AC_MSG_ERROR([Don't know how to map $1 to an integer])])
+ AC_DEFINE_UNQUOTED(AC_TR_CPP($1_MAX), [$sd_type_max],
+ [what int to use to maximize $1])
+ AC_MSG_CHECKING([what int to to use to maximize $1])
+ AC_MSG_RESULT([$sd_type_max])
+])