[cfe-dev] clang 3.1 (trunk at r154095) + mingw gcc 4.6.2 slowness

[NAKAMURA Takumi]

How about adding LDFLAGS=-static (or similarly linking libstdc++ as static)?

I suspect resolving pseudo-reloc would spend too much.

How long do you wait with "clang --help" ?

...Takumi


2012/4/6 Jon <jon.forums at gmail.com>:
> This is a redux of http://lists.cs.uiuc.edu/pipermail/cfe-dev/2012-March/020078.html and I'd like to understand if I'm just building clang incorrectly, or whether this is simply the current state of things.
>
> I suspect the slowness is due to the `clang` driver having to use the `gcc` driver to assemble and link. Perhaps MSYS's `sh` is also getting pulled into the party.
>
> I build clang (Win7 32bit) from an svn checkout using a custom integrated MSYS/MinGW 4.6.2/autoconf toolchain like:
>
>  sh ../llvm-svn/configure --prefix=c:/clang --enable-optimized --disable-assertions \
>     --disable-docs --disable-pic --disable-pthreads --enable-targets=x86 \
>     --with-c-include-dirs=c:/DevKit/mingw/include --prefix=c:/clang
>  make
>  make install
>
> Using that freshly built clang to build something trivial like https://github.com/thecodeshop/w32time I get the following build times:
>
> # MinGW GCC 4.6.2
> timer make
> gcc -O2 -o w32time.exe -Wall w32time.c
> ...
> real    0.608
> system  0.093
> user    0.000
>
>
> # Clang 3.1 (trunk at r154095)
> timer make CC=c:/clang/bin/clang.exe
> c:/clang/bin/clang.exe -O2 -o w32time.exe -Wall w32time.c
> ...
> real    5.101
> system  0.046
> user    0.000
>
> Building './configure' based projects shows similar slowness.
>
> Why is this, and what are the suggested workarounds?
>
> FWIW, my clang advertises itself as posix thread model, and gcc advertises as win32 thread model. There is no `libwinpthread-1.dll` on PATH.
>
> Jon
>
> ---
> Fail fast. Fail often. Fail publicly. Learn. Adapt. Repeat.
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