[LLVMdev] Makefile dependencies and configure test fix

[Tanya Lattner]

Shantonu,

I just wanted to verify that you used the llvm/autoconf/AutoRegen.sh  
script to regenerate configure. Is that correct?

Thanks,
Tanya

On Feb 5, 2008, at 10:10 AM, Shantonu Sen wrote:

> Some low-priority fixes to the build system.... These can probably  
> wait after 2.2
>
> 1) The current configure script checks for gcc 3.x or later by  
> parsing "gcc --version" output and trying to tokenize it to find  
> the major compiler version. This is pretty fragile and interacts  
> poorly with compilers produced by vendors (like Apple) that modify  
> this string to output target triple (including potentially i686 and  
> darwin9), FSF GCC version, Apple local version. There's lots of  
> numbers there, and the sed expression doesn't find any of the right  
> ones. This patch turns the check into a compile-time check for  
> __GNUC__ version. Since autoconf already does this to determine if  
> you're using GCC or not, it should be pretty safe.
>
> Believe it or not, I dusted off a copy of gcc 2.95.2 for Mac OS X  
> for PowerPC and ran it under Rosetta to verify this fix:
>
> [ssen at virgon]$ gcc-2.95.2 -v
> Reading specs from /usr/libexec/gcc/darwin/ppc/2.95.2/specs
> Apple Computer, Inc. version gcc-926, based on gcc version 2.95.2  
> 19991024 (release)
> [ssen at virgon]$ ./configure CC=gcc-2.95.2 CXX=g++-2.95.2
> ...
> checking for llvm-gcc... no
> checking for llvm-g++... no
> checking tool compatibility... configure: error: gcc 3.x required,  
> but you have a lower version
>
> 2) Makefile.rules is missing some dependencies for shared library  
> targets, which means if you change core libraries and do a rebuild,  
> things like tools/lto don't get relinked against the new libraries.  
> Test case is to have a pre-built tree and do "touch lib/System/Unix/ 
> Program.inc && make" and make sure you see "Linking Debug Loadable  
> Module LLVMlto.dylib".
>
> 3) There appears to be a typo for for llvm_cv_no_link_all_option  
> for Darwin, but this never seems to be used anyway. Probably worth  
> fixing in case a new standalone project uses the LLVM makefiles.
>
> I regenerated the configure script with the required versions of  
> autotools on Mac OS X on Intel.
>
> <llvm-makefile-and-configure.patch>
>
> Shantonu Sen
> ssen at apple.com
>
> Sent from my Mac Pro
>
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