print methods can be replaced at run-time with set_print_func<>()

[ginac.git] / acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
index 78cdcdfdbc90c51f78317fb6d3ff1ffc304de595..4b5cd720e89100ffcafb3b9442ab4ab7a3168563 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -4,60 +4,35 @@ dnl additions' names with AC_ but with GINAC_ in order to steer clear of
 dnl future trouble.
 dnl ===========================================================================
 
-dnl Generally, it is a bad idea to put specialized header files for a library
-dnl into a generic directory like /usr/local/include/.  Instead, one should put
-dnl them into a subdirectory.  GiNaC does it, NTL does it.  Unfortunately, CLN
-dnl doesn't do so but some people choose to do it by hand.  In these cases we
-dnl need to #include <cln/cln.h>, otherwise #include <cln.h>.  This macro
-dnl tries to be clever and find out the correct way by defining the variable
-dnl HAVE_CLN_CLN_H in config.h:
-AC_DEFUN(GINAC_CHECK_CLN_H,
-    [AC_PROVIDE([$0])
-    AC_CHECK_HEADERS(cln/cln.h, ,
-        AC_CHECK_HEADERS(cln.h, ,
-            AC_MSG_ERROR([cannot find header for Bruno Haible's CLN]);
-        )
-    )
-])
+dnl Usage: GINAC_RLVERSION
+dnl The maintainers of libreadline are complete morons: they don't care a shit
+dnl about compatiblilty (which is not so bad by itself) and at the same time 
+dnl they don't export the version to the preprocessor so we could kluge around 
+dnl incomatiblities.  The only reliable way to figure out the version is by 
+dnl checking the extern variable rl_library_version at runtime.  &#@$%*!
+AC_DEFUN(GINAC_LIB_READLINE_VERSION,
+[AC_CACHE_CHECK([for version of libreadline], ginac_cv_rlversion, [
+AC_TRY_RUN([
+#include <stdio.h>
+#include <sys/types.h>
+#include <readline/readline.h>
 
-dnl This macro is needed because the generic AC_CHECK_LIB doesn't work because
-dnl C++ is more strongly typed than C.  Therefore we need to work with the 
-dnl more fundamental AC_TRY_LINK instead.
-AC_DEFUN(GINAC_CHECK_LIBCLN,
-    [AC_PROVIDE([$0])
-    AC_MSG_CHECKING([for doublefactorial in -lcln])
-    saved_LIBS="${LIBS}"
-    AC_CACHE_VAL(ginac_cv_lib_cln_link,
-        [LIBS="-lcln"
-        case "${ac_cv_header_cln_cln_h}" in
-        "yes")
-            AC_TRY_LINK([#include <cln/cl_integer.h>],
-                [doublefactorial(2);],
-                ginac_cv_lib_cln_link="-lcln",
-                ginac_cv_lib_cln_link="fail")
-            ;;
-        *)
-            AC_TRY_LINK([#include <cl_integer.h>],
-                [doublefactorial(2);],
-                ginac_cv_lib_cln_link="-lcln",
-                ginac_cv_lib_cln_link="fail")
-            ;;
-        esac
-    ])
-    case "${ginac_cv_lib_cln_link}" in
-dnl linking worked:
-    "-lcln")
-        LIBS="${ginac_cv_lib_cln_link} ${saved_LIBS}"
-        AC_MSG_RESULT("yes")
-    ;;
-dnl linking failed:
-    "fail")
-        LIBS="${saved_LIBS}"
-        AC_MSG_RESULT([no])
-        GINAC_ERROR([I could not successfully link a test-program against libcln.
-   You either need to set \$LDFLAGS or install/update the CLN library.])
-    ;;
-    esac
+main()
+{
+    FILE *fd;
+    fd = fopen("conftest.out", "w");
+    fprintf(fd, "%s\n", rl_library_version);
+    fclose(fd);
+    return 0;
+}], ginac_cv_rlversion=`cat 'conftest.out'`, ginac_cv_rlversion='unknown', ginac_cv_rlversion='4.2')])
+if test "x${ginac_cv_rlversion}" != "xunknown"; then
+  RL_VERSION_MAJOR=`echo ${ginac_cv_rlversion} | sed -e 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
+  AC_DEFINE_UNQUOTED(GINAC_RL_VERSION_MAJOR, $RL_VERSION_MAJOR, [Major version of installed readline library.])
+  RL_VERSION_MINOR=`echo ${ginac_cv_rlversion} | sed -e 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
+  AC_DEFINE_UNQUOTED(GINAC_RL_VERSION_MINOR, $RL_VERSION_MINOR, [Minor version of installed readline library.])
+else
+  GINAC_WARNING([I could not run a test of libreadline (needed for building ginsh).])
+fi
 ])
 
 dnl Usage: GINAC_TERMCAP
@@ -111,8 +86,10 @@ if test "x${ginac_error}" = "xyes"; then
     if test "x${ginac_warning_txt}" != "x"; then
         echo "${ginac_warning_txt}"
     fi
-    echo "deleting cache ${cache_file}"
-    rm -f $cache_file
+    if test "x$cache_file" != "x/dev/null"; then
+        echo "deleting cache ${cache_file}"
+        rm -f $cache_file
+    fi
     else 
         if test x$ginac_warning = xyes; then
             echo "=== The following minor problems have been detected by configure."