[MacPorts] #71053: clang @19.1.1_0+analyzer: can't find standard headers

[MacPorts]

#71053: clang @19.1.1_0+analyzer: can't find standard headers
---------------------------+---------------------
  Reporter:  paul-j-lucas  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.2
Resolution:                |   Keywords:  ventura
      Port:  clang-19      |
---------------------------+---------------------

Comment (by paul-j-lucas):

 > I realize you think that the headers in Xcode or the SDK in the CLTs
 should not be used ...

 That's not what I said. I only hypothesized as to why clang/llvm ''might''
 be installing their own full set of headers. I never said anything about
 ''use'' of headers.


 > Now, I have no idea how you built clang-19 exactly to force it to ignore
 the SDK

 I didn't do anything to force anything. I just did `port install
 clang-19`. FYI, the CLT's clang-as-gcc can find the headers and build
 working executables just fine.

 FYI:

 {{{
 $ cd /Library/Developer/CommandLineTools/SDKs
 $ ls -l
 lrwxr-xr-x 1 root wheel  14 Oct 12 09:47 MacOSX.sdk -> MacOSX14.2.sdk/
 drwxr-xr-x 7 root wheel 224 Oct 12 09:47 MacOSX13.3.sdk/
 lrwxr-xr-x 1 root wheel  14 Oct 12 09:46 MacOSX13.sdk -> MacOSX13.3.sdk/
 drwxr-xr-x 7 root wheel 224 Oct 12 09:48 MacOSX14.2.sdk/
 lrwxr-xr-x 1 root wheel  14 Oct 12 09:45 MacOSX14.sdk -> MacOSX14.2.sdk/
 }}}

 From experience, on a system such as mine that's running a macOS (13.7)
 older that the SDK to which the `MacOSX.sdk` symlink points (14.2), it can
 sometimes matter. (I guess my kind-of-old Intel iMac is running the latest
 supported OS for its hardware; otherwise, I would have been prompted to
 upgrade.)

 When you build, do you build against ''only'' when CLT is installed? Or
 the full Xcode? Also from experience, it can make a difference.

 Just for the heck of it, I reinstalled CLT 15.1, but now that the clang-19
 binaries have been built, I get those installed instead --- which work. So
 I guess I'm personally fine for now.

-- 
Ticket URL: <https://trac.macports.org/ticket/71053#comment:14>
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