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Problem with AC_CHECK_FUNC and compaq cxx in strict_ansi mode
From: |
Jean-Marc Lasgouttes |
Subject: |
Problem with AC_CHECK_FUNC and compaq cxx in strict_ansi mode |
Date: |
22 Oct 2001 17:02:53 +0200 |
User-agent: |
Gnus/5.0808 (Gnus v5.8.8) Emacs/20.4 |
Hello,
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 'ansi' mode]
The solution is to declare also f as 'extern "C"', as done in bug2.C
(attached too). In this case, I only get the warning
fantomas: cxx -std strict_ansi bug2.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 ();
-----^
but I presume this is not a problem.
Please let me know if you need more information on this. I'd be glad
to see this fixed in next release...
JMarc
bug1.C
Description: Sample code which does not compile
bug2.C
Description: Sample code which does compile
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