[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
 Keywords:  ventura       |       Port:  clang-19
--------------------------+----------------------
 I had the previous clang-19 installed and everything worked fine, but
 since the update, trying to compile a simple "hello, world" program
 results in:

 {{{
 $ clang-mp-19 hello.c -o hello
 hello.c:1:10: fatal error: 'stdio.h' file not found
     1 | #include <stdio.h>
       |          ^~~~~~~~~
 1 error generated.
 }}}

 The files, however, are there:

 {{{
 $ port contents clang-19 | grep stdio.h
   /opt/local/libexec/llvm-19/include/c++/v1/stdio.h
 /opt/local/libexec/llvm-19/lib/clang/19/include/llvm_libc_wrappers/stdio.h
 }}}

 Other information of likely interest:

 {{{
 $ system_profiler SPSoftwareDataType SPHardwareDataType
 Software:

     System Software Overview:

       System Version: macOS 13.6.9 (22G830)
       Kernel Version: Darwin 22.6.0
       Boot Volume: Macintosh HD
       Boot Mode: Normal
       Computer Name: iMac
       User Name: Paul J. Lucas (pjl)
       Secure Virtual Memory: Enabled
       System Integrity Protection: Enabled
       Time since boot: 41 days, 7 hours, 49 minutes

 Hardware:

     Hardware Overview:

       Model Name: iMac
       Model Identifier: iMac18,3
       Processor Name: Quad-Core Intel Core i5
       Processor Speed: 3.4 GHz
       Number of Processors: 1
       Total Number of Cores: 4
       L2 Cache (per Core): 256 KB
       L3 Cache: 6 MB
       Memory: 16 GB
       System Firmware Version: 529.140.2.0.0
       OS Loader Version: 577.140.2~22
       SMC Version (system): 2.41f2
       Serial Number (system): C02YF02SJ1GN
       Hardware UUID: 2FCAC61C-2069-55F8-95A6-058A0DAE8522
       Provisioning UDID: 2FCAC61C-2069-55F8-95A6-058A0DAE8522
 }}}

 {{{
 $ pkgutil --pkg-info=com.apple.pkg.CLTools_Executables
 package-id: com.apple.pkg.CLTools_Executables
 version: 15.1.0.0.1.1700200546
 volume: /
 location: /
 install-time: 1703338038
 }}}

 BTW: the previous version of the port installed binaries; this version of
 the port compiles from source (and it takes a really long time).

-- 
Ticket URL: <https://trac.macports.org/ticket/71053>
MacPorts <https://www.macports.org/>
Ports system for macOS