get the SIG constants for ourselves, rather than relying on HsBaseConfig.h

1 files changed, 49 insertions, 2 deletions

diff --git a/aclocal.m4 b/aclocal.m4
index fbea551..8255156 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1,2 +1,49 @@
-# Empty file to avoid a dependency on automake: autoreconf calls aclocal to
-# generate a temporary aclocal.m4t when no aclocal.m4 is present.
+# FP_COMPUTE_INT(EXPRESSION, VARIABLE, INCLUDES, IF-FAILS)
+# --------------------------------------------------------
+# Assign VARIABLE the value of the compile-time EXPRESSION using INCLUDES for
+# compilation. Execute IF-FAILS when unable to determine the value. Works for
+# cross-compilation, too.
+#
+# Implementation note: We are lazy and use an internal autoconf macro, but it
+# is supported in autoconf versions 2.50 up to the actual 2.57, so there is
+# little risk.
+AC_DEFUN([FP_COMPUTE_INT],
+[_AC_COMPUTE_INT([$1], [$2], [$3], [$4])[]dnl
+])# FP_COMPUTE_INT
+
+
+# FP_CHECK_CONST(EXPRESSION, [INCLUDES = DEFAULT-INCLUDES], [VALUE-IF-FAIL = -1])
+# -------------------------------------------------------------------------------
+# Defines CONST_EXPRESSION to the value of the compile-time EXPRESSION, using
+# INCLUDES. If the value cannot be determined, use VALUE-IF-FAIL.
+AC_DEFUN([FP_CHECK_CONST],
+[AS_VAR_PUSHDEF([fp_Cache], [fp_cv_const_$1])[]dnl
+AC_CACHE_CHECK([value of $1], fp_Cache,
+[FP_COMPUTE_INT([$1], fp_check_const_result, [AC_INCLUDES_DEFAULT([$2])],
+                [fp_check_const_result=m4_default([$3], ['-1'])])
+AS_VAR_SET(fp_Cache, [$fp_check_const_result])])[]dnl
+AC_DEFINE_UNQUOTED(AS_TR_CPP([CONST_$1]), AS_VAR_GET(fp_Cache), [The value of $1.])[]dnl
+AS_VAR_POPDEF([fp_Cache])[]dnl
+])# FP_CHECK_CONST
+
+
+# FP_CHECK_CONSTS_TEMPLATE(EXPRESSION...)
+# ---------------------------------------
+# autoheader helper for FP_CHECK_CONSTS
+m4_define([FP_CHECK_CONSTS_TEMPLATE],
+[AC_FOREACH([fp_Const], [$1],
+  [AH_TEMPLATE(AS_TR_CPP(CONST_[]fp_Const),
+               [The value of ]fp_Const[.])])[]dnl
+])# FP_CHECK_CONSTS_TEMPLATE
+
+
+# FP_CHECK_CONSTS(EXPRESSION..., [INCLUDES = DEFAULT-INCLUDES], [VALUE-IF-FAIL = -1])
+# -----------------------------------------------------------------------------------
+# List version of FP_CHECK_CONST
+AC_DEFUN([FP_CHECK_CONSTS],
+[FP_CHECK_CONSTS_TEMPLATE([$1])dnl
+for fp_const_name in $1
+do
+FP_CHECK_CONST([$fp_const_name], [$2], [$3])
+done
+])# FP_CHECK_CONSTS