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[again] Problem with AC_CHECK_FUNC and compaq cxx in strict_ansi mode

From: Jean-Marc Lasgouttes
Subject: [again] Problem with AC_CHECK_FUNC and compaq cxx in strict_ansi mode
Date: 08 Nov 2001 15:21:15 +0100
User-agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.4

[I sent a similar message a couple weeks ago, but since I got no
answer, I'll try to paraphrase it]


I am compiling a C++ program (LyX) with compaq cxx 6.2 in strict ansi
mode. It happens that no C functions are found by autoconf 2.52
AC_CHECK_FUNC macro, because the program bug1.C (attached, taken from
what autoconf uses) produces:

fantomas: cxx -std strict_ansi bug1.C 
cxx: Error: bug1.C, line 22: a value of type "char (*)() C" cannot be
          assigned to an entity of type "char (*)()"
f = memmove;
cxx: Info: 1 error detected in the compilation of "bug1.C".

I get only a warning in normal 'ansi' mode (but I cannot compile LyX
in ansi mode, so...)

The solution is to declare also f as 'extern "C"'.In this case, I only
get the warning (which is probably not a problem)

fantomas: cxx -std strict_ansi bug1.C 
cxx: Warning: bug2.C, line 6: Expected type
          "void *(void *, const void *, unsigned long) C" is incompatible with
          declared type "char () C", function will not be made intrinsic
char memmove ();

Here is a proposed patch I use to be able to compile LyX with cxx 6.2.
It just changes AC_LANG_FUNC_LINK_TRY(C) to add an extra extern "C"
when needed. I tested it with g++ 2.95.2 nd got no problem.

Please let me know if you need more information on this. I'd be
grateful to see this fixed in next release.


Attachment: bug1.C
Description: Small program demonstrating the error

Attachment: patch-autoconf
Description: Proposed patch

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