llvm dev - Sep 2004 - [LLVMdev] Need for HAVE_MALLOC_H and a rewrite of../Config/alloca.hto handle this define

>From: "Henrik Bach" <henrik_bach_llvm at hotmail.com>
>Date: Sun, 19 Sep 2004 02:26:51 +0200
>
>Hi
>
>On win32 the alloca function is prototyped in <malloc.h>.
>
>The configure script checks the precence of this header file:
>-----------------------
>...
>checking malloc.h usability... yes
>checking malloc.h presence... yes
>checking for malloc.h... yes
>...
>-----------------------
>
>Later in the configure script, it checks:
>-----------------------
>...
>checking for working alloca.h... no
>checking for alloca... yes
>...
>-----------------------
>
>It also checks for presence of stdlib:
>-----------------------
>...
>checking for stdlib.h... yes
>...
>-----------------------
>
>This gives us these defines in llvm/Config/config.h:
>-----------------------
>#define HAVE_ALLOCA 1
>#define HAVE_STDLIB_H 1
>-----------------------
>
>On the mingw platform it results in that we get this error when compiling:
>-----------------------
>C:/MinGW/msys/local/src/llvm/lib/Support/FileUtilities.cpp: In function 
>`bool
>   llvm::CheckMagic(const std::string&, const std::string&)':
>C:/MinGW/msys/local/src/llvm/lib/Support/FileUtilities.cpp:33: error: 
>`alloca'
>   undeclared (first use this function)
>-----------------------
>
>I don't know whether on certain unix systems that the alloc function is 
>prototyped in stdlib.h. But, when HAVE_STDLIB_H is set on mingw systems we 
>get above error rather than this:
>-----------------------
>The function alloca() is required but not found!
>-----------------------
>
>This leaves us, that we need a test in the configure script that gives us a 
>define like:
>HAVE_MALLOC_H and to rewrite llvm/Config/alloca.h to handle this define 
>appropriately.
Sorry, HAVE_MALLOC_H *is* a valid define in llvm/Config/config.h. This 
leaves, that llvm/Config/alloca.h has to be fixed accordingly. I'll try to 
come up with a patch.

Henrik

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