FYI: Adjust circular dependencies

[Akim Demaille]

Index: ChangeLog
from  Akim Demaille  <address@hidden>
        Macros used by AC_LANG_COMPILER macros shall not AC_REQUIRE
        AC_LANG_COMPILER by the way of AC_COMPILE_IFELSE etc.

        * acspecific.m4 (_AC_EXEEXT): Use _AC_LINK_IFELSE, not
        AC_LINK_IFELSE to avoid AC_REQUIREing AC_PROG_CC which precisely
        requires _AC_EXEEXT.
        Don't run _AC_CYGWIN, _AC_MINGW32, _AC_EMXOS2.
        * aclang.m4 (_AC_PROG_F77_G): Use _AC_COMPILE_IFELSE, not
        AC_COMPILE_IFELSE.
        (_AC_LANG_COMPILER_WORKS): Use _AC_LINK_IFELSE, not
        AC_LINK_IFELSE.

2000-10-12  Akim Demaille  <address@hidden>

Index: TODO
===================================================================
RCS file: /cvs/autoconf/TODO,v
retrieving revision 1.91
diff -u -r1.91 TODO
--- TODO 2000/10/12 10:12:43 1.91
+++ TODO 2000/10/12 12:36:48
@@ -9,6 +9,10 @@
 
 * Autoconf 2.50
 
+** AC_EXEEXT, AC_OBJEXT
+We need a good implement.  As much as possible, they should not depend
+upon AC_EMXOS2 etc.
+
 ** More tests
 Check that AC_REQUIRE circular dependencies are caught.
 
Index: aclang.m4
===================================================================
RCS file: /cvs/autoconf/aclang.m4,v
retrieving revision 1.69
diff -u -r1.69 aclang.m4
--- aclang.m4 2000/10/11 14:51:29 1.69
+++ aclang.m4 2000/10/12 12:36:48
@@ -519,7 +519,7 @@
 # -----------------------
 define([_AC_LANG_COMPILER_WORKS],
 [AC_MSG_CHECKING([whether the _AC_LANG compiler works])
-AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+_AC_LINK_IFELSE([AC_LANG_PROGRAM()],
 [# FIXME: these cross compiler hacks should be removed for autoconf 3.0
 # If not cross compiling, check that we can run a simple program.
 if test "$cross_compiling" != yes; then
@@ -1051,7 +1051,7 @@
 FFLAGS=
 AC_CACHE_CHECK(whether $F77 accepts -g, ac_cv_prog_f77_g,
 [FFLAGS=-g
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
 [ac_cv_prog_f77_g=yes],
 [ac_cv_prog_f77_g=no])
 ])
Index: acspecific.m4
===================================================================
RCS file: /cvs/autoconf/acspecific.m4,v
retrieving revision 1.300
diff -u -r1.300 acspecific.m4
--- acspecific.m4 2000/10/02 12:47:13 1.300
+++ acspecific.m4 2000/10/12 12:36:50
@@ -1559,14 +1559,11 @@
 # executable.  If this is called, the executable extensions will be
 # automatically used by link commands run by the configure script.
 define([_AC_EXEEXT],
-[_AC_CYGWIN
-_AC_MINGW32
-_AC_EMXOS2
-AC_CACHE_CHECK([for executable suffix], ac_cv_exeext,
+[AC_CACHE_CHECK([for executable suffix], ac_cv_exeext,
 [case "$CYGWIN $MINGW32 $EMXOS2" in
   *yes*) ac_cv_exeext=.exe ;;
   *)
-  AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+  _AC_LINK_IFELSE([AC_LANG_PROGRAM()],
   [if test ! -f conftest; then
     for ac_file in conftest.*; do
        case $ac_file in
@@ -1594,18 +1591,17 @@
 define([_AC_OBJEXT],
 [AC_CACHE_CHECK([for object suffix], ac_cv_objext,
 [AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
- if AC_TRY_EVAL(ac_compile); then
-   for ac_file in conftest.*; do
-   case $ac_file in
-     *.$ac_ext) ;;
-     *) ac_cv_objext=`echo $ac_file | sed s/conftest.//` ;;
-   esac
-   done
- else
-   rm -f conftest.$ac_ext
-   AC_MSG_ERROR([cannot compile])
- fi
-])
+if AC_TRY_EVAL(ac_compile); then
+  for ac_file in conftest.*; do
+  case $ac_file in
+    *.$ac_ext) ;;
+    *) ac_cv_objext=`echo $ac_file | sed s/conftest.//` ;;
+  esac
+  done
+else
+  rm -f conftest.$ac_ext
+  AC_MSG_ERROR([cannot compile])
+fi])
 AC_SUBST(OBJEXT, $ac_cv_objext)dnl
 ac_objext=$ac_cv_objext
 rm -f conftest.$ac_objext conftest.$ac_ext