[cfe-commits] [PATCH] getting_started.html and cmake, and questions

[Óscar Fuentes]

John Thompson
<john.thompson.jtsoftware at gmail.com>
writes:

> Question:  Why does the cmake build for Win32 only target Win32, whereas the
> default make build targets all platforms?

You mean "Why does the cmake build for Win32 only target X86"

For several reasons:

 * Supposedly, most LLVM consumers on Windows are users, not LLVM
   developers. The user is usually interested on the target architecture
   where he builds LLVM.

 * Build times on VC++ are significantly slower than on Linux. Enabling
   only the target architecture that most Windows people will work with
   reduces build times.

 * Almost every LLVM developer works with gcc and this means that code
   is committed without testing on VC++. Reducing the amount of code
   from the default VC++ build will lessen the chance of hitting a
   gcc/VC++ incompatibility that stops the build.

> Question:  Does the buildbot build for Win32 build for all targets (in case
> I check in some platform-specific LLVM tests)?

Dunno.

> Here's a patch for the Getting Started page to tell people how to change the
> targets:

LLVM_TARGETS_TO_BUILD is the first variable mentioned on

http://www.llvm.org/docs/CMake.html#llvmvars

That page is referenced from

http://www.llvm.org/docs/GettingStartedVS.html

Why we should mention that option and not the others?

(And how does one access www/get_started.html from http://www.llvm.org ?)

[snip]