Re: [PATCH 1/1] Fix detection of pwritev support for OSX.

On 23.01.2021 08:02, Sergey Shinderuk wrote:
>> On the whole it looks like we should recommend installing the CLT
>> and not bothering with Xcode, which is about 10X the size:
>>
>> $ du -hs /Library/Developer/CommandLineTools
>> 1.1G    /Library/Developer/CommandLineTools
>> $ du -hs /Applications/Xcode.app
>>   15G    /Applications/Xcode.app
>>
> 
> Fair.

BTW, Homebrew prefers the CLT SDK:
https://github.com/Homebrew/brew/blob/master/Library/Homebrew/os/mac.rb#L138

       # Prefer CLT SDK when both Xcode and the CLT are installed.
       # Expected results:
       # 1. On Xcode-only systems, return the Xcode SDK.
       # 2. On Xcode-and-CLT systems where headers are provided by the 
system, return nil.
       # 3. On CLT-only systems with no CLT SDK, return nil.
       # 4. On CLT-only systems with a CLT SDK, where headers are 
provided by the system, return nil.
       # 5. On CLT-only systems with a CLT SDK, where headers are not 
provided by the system, return the CLT SDK.


Here is the relevant discussion:
https://github.com/Homebrew/brew/pull/7134

I like the example of Git compiled against the wrong 
LIBCURL_VERSION_NUM. Clearly, there are other issues with 
cross-compiling to a newer SDK, besides autoconf probes and weak imports.

-- 
Sergey Shinderuk
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company