Do not cache the result of the vasprintf test (see configure.in for explanation)...

[fw/sdcc] / sim / ucsim / configure.in

diff --git a/sim/ucsim/configure.in b/sim/ucsim/configure.in
index fda496264b46d85c666527186d294c36ed9485f1..f40b6138a65804ad9d3aa6ac1de574eee4a818ba 100644 (file)
--- a/sim/ucsim/configure.in
+++ b/sim/ucsim/configure.in
@@ -95,6 +95,44 @@ AC_DEFINE_UNQUOTED(HEADER_FD, ${s51_cv_fd})
 
 # Checking for functions/libs
 # ===========================================================================
+
+AC_DEFUN(AC_CHECK_FUNC_NOCACHE,
+[AC_MSG_CHECKING([for $1])
+AC_TRY_LINK(
+dnl Don't include <ctype.h> because on OSF/1 3.0 it includes <sys/types.h>
+dnl which includes <sys/select.h> which contains a prototype for
+dnl select.  Similarly for bzero.
+[/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $1(); below.  */
+#include <assert.h>
+/* Override any gcc2 internal prototype to avoid an error.  */
+]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
+extern "C"
+#endif
+])dnl
+[/* We use char because int might match the return type of a gcc2
+    builtin and then its argument prototype would still apply.  */
+char $1();
+], [
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined (__stub_$1) || defined (__stub___$1)
+choke me
+#else
+$1();
+#endif
+], eval "ac_cv_func_$1=yes", eval "ac_cv_func_$1=no")
+if eval "test \"`echo '$ac_cv_func_'$1`\" = yes"; then
+  AC_MSG_RESULT(yes)
+  ifelse([$2], , :, [$2])
+else
+  AC_MSG_RESULT(no)
+ifelse([$3], , , [$3
+])dnl
+fi
+])
+
 AC_CHECK_LIB(socket,socket)
 AC_CHECK_LIB(nsl,xdr_short)
 AC_CHECK_LIB(panel,panel_above,
@@ -115,9 +153,16 @@ AC_SUBST(curses_ok)
 AC_SUBST(CURSES_LIBS)
 
 AC_FUNC_VPRINTF
-AC_CHECK_FUNCS(vsnprintf vasprintf)
+dnl Do not cache the result of the vasprintf test.
+dnl This is because vasprintf is defined in the C++ runtime 
+dnl for egcs, but not in the C runtime. Thus, caching the result
+dnl of this test (which is done with C++) will cause later C
+dnl based tests to falsely conclude that vasprintf is available
+dnl to C programs.
+dnl It's a bloody stupid function anyway. 
+AC_CHECK_FUNC_NOCACHE(vasprintf)
 AC_CHECK_FUNCS(strlen strcpy strcat strstr strcmp strerror strtok strdup)
-AC_CHECK_FUNCS(strchr memcpy)
+AC_CHECK_FUNCS(vsnprintf strchr memcpy)
 dnl AC_CHECK_FUNCS(getline)
 dnl AC_CHECK_FUNCS(getdelim)
 AC_CHECK_FUNCS(fgets)