On Dec 6, 2007 4:30 PM, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> Umm. Why not just make the test be whether the following compiles cleanly?
>
> #include <iconv.h>
>
> extern size_t iconv(iconv_t cd,
> char **inbuf, size_t *inbytesleft,
> char **outbuf, size_t *outbytesleft);
>
> because if the compiler has seen a "const char **inbuf", then it should
> error out with a "conflicting types for 'iconv'" style message..
Yeah, this is what I did:
diff --git a/configure.ac b/configure.ac
index 5f8a15b..675d3e0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -182,6 +182,29 @@ AC_SUBST(NEEDS_LIBICONV)
AC_SUBST(NO_ICONV)
test -n "$NEEDS_LIBICONV" && LIBS="$LIBS -liconv"
#
+# Define OLD_ICONV if the iconv function prototype uses const** (Darwin and
+# some FreeBSD installations).
+AC_DEFUN([OLDICONVTEST_SRC], [
+#include <iconv.h>
+
+int main(void)
+{
+ char* value = "test";
+
+ (void) iconv (NULL, &value, NULL, NULL, NULL);
+}
+])
+AC_MSG_CHECKING([for old iconv])
+old_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror"
+AC_COMPILE_IFELSE(OLDICONVTEST_SRC,
+ [AC_MSG_RESULT([no])
+ OLD_ICONV=],
+ [AC_MSG_RESULT([yes])
+ OLD_ICONV=UnfortunatelyYes])
+CFLAGS="$old_CFLAGS"
+AC_SUBST(OLD_ICONV)
+#
# Define NO_DEFLATE_BOUND if deflateBound is missing from zlib.
AC_DEFUN([ZLIBTEST_SRC], [
#include <zlib.h>
The problem is that AC_COMPILE_IFELSE doesn't barf on warnings, so I
had to put in the CFLAGS hack to do -Werror (this is what Jakub did
also, I think).
So if this isn't rude to use -Werror (which is probably gcc-specific
in one or more ways), then fine. If it is rude to use -Werror, then
yeah, there needs to be some check for the warning, which I confess in
my five minutes of learning autoconf I don't understand well enough to
say if it's possible.
Blake
--
Blake Ramsdell | http://www.blakeramsdell.com
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