Change to Clang fallback has broken multiple R ports: /bin/sh: /opt/local/bin/clang-mp-14: No such file or directory

[barracuda156]

Example of the port which has built fine earlier (this is a trivial update to it):

  DEBUG: Executing org.macports.destroot (R-rlecuyer)
11189
  DEBUG: Environment: 
11190
  CC_PRINT_OPTIONS='YES'
11191
  CC_PRINT_OPTIONS_FILE='/opt/local/var/macports/build/_Users_runner_work_macports-ports_macports-ports_ports_R_R-rlecuyer/R-rlecuyer/work/.CC_PRINT_OPTIONS'
11192
  CPATH='/opt/local/include'
11193
  DEVELOPER_DIR='/Library/Developer/CommandLineTools'
11194
  LIBRARY_PATH='/opt/local/lib'
11195
  MACOSX_DEPLOYMENT_TARGET='11.0'
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  SDKROOT='/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk'
11197
  Executing:  cd "/opt/local/var/macports/build/_Users_runner_work_macports-ports_macports-ports_ports_R_R-rlecuyer/R-rlecuyer/work/rlecuyer" && /opt/local/bin/R CMD INSTALL . --library=/opt/local/var/macports/build/_Users_runner_work_macports-ports_macports-ports_ports_R_R-rlecuyer/R-rlecuyer/work/destroot/opt/local/Library/Frameworks/R.framework/Versions/4.2/Resources/library 
11198
  DEBUG: system:  cd "/opt/local/var/macports/build/_Users_runner_work_macports-ports_macports-ports_ports_R_R-rlecuyer/R-rlecuyer/work/rlecuyer" && /opt/local/bin/R CMD INSTALL . --library=/opt/local/var/macports/build/_Users_runner_work_macports-ports_macports-ports_ports_R_R-rlecuyer/R-rlecuyer/work/destroot/opt/local/Library/Frameworks/R.framework/Versions/4.2/Resources/library 
11199
  * installing *source* package ‘rlecuyer’ ...
11200
  ** package ‘rlecuyer’ successfully unpacked and MD5 sums checked
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  ** using staged installation
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  ** libs
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  /opt/local/bin/clang-mp-14 -I"/opt/local/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/opt/local/include -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk   -fPIC  -pipe -Os -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk -arch x86_64  -c RngStream.c -o RngStream.o
11204
  /bin/sh: /opt/local/bin/clang-mp-14: No such file or directory
11205
  make: *** [RngStream.o] Error 127
11206
  ERROR: compilation failed for package ‘rlecuyer’

There are some other identical failures here: ​https://github.com/macports/macports-ports/actions/runs/4515567748/jobs/7953004414 (not all failures are related to this, but several are).

[barracuda156]

Okay, this: [347cd6ba812a9831a4728c5d61328718bb96e8e5/macports-ports]

[jmroot (Joshua Root)]

It looks to me like the R ports are always building with clang-14, which must be hardcoded or baked in somewhere, and ignoring the value of configure.cc.

[barracuda156]

Replying to jmroot:

It looks to me like the R ports are always building with clang-14, which must be hardcoded or baked in somewhere, and ignoring the value of configure.cc.

I am not 100% sure, but I think it was due to compilers PG settings for Clangs (or related PG). If now it is moved to Clang-15, then it should be used, perhaps.

I revbumped R in the PR now: ​https://github.com/macports/macports-ports/pull/18079 If Clang-15 is picked for it, then it will be saved into Makevars settings, and everything gonna work as before, but with a new Clang. If not, then perhaps hardcoding is the way to go.

I believe, there is nothing inherent in R itself or its ports that requires a specific Clang version. Some R packages want C+17, and majority want at least C+11, but both worked with Clang-14 on x86, and should work now with Clang-15, provided it gets picked for R itself.

[jmroot (Joshua Root)]

OK, so it's baked into R. If that can't be avoided or overridden, you need to make sure that all the R-* ports set the same configure.compiler as R itself.

[barracuda156]

Replying to jmroot:

OK, so it's baked into R. If that can't be avoided or overridden, you need to make sure that all the R-* ports set the same configure.compiler as R itself.

Everything works conditional on consistent Macports settings. R revbump solves the problem, CI now pass. I will add a note into clang_compilers to revbump R port if settings there are changed again. Then we would not run into breaking a 1000+ ports.

[barracuda156]

In 3d4b44d213bc0d6775d0b9306bb967d1bc99bce2/macports-ports (master):

clang_compilers.tcl: non-functional change: add a note to revbump R if settings are changed

Fixes: #67144
[skip ci]

[cjones051073 (Chris Jones)]

The above is commit is not a fix. It is at best a bandaid around what is the real issue, which is R baking the compiler it uses to be built into itself for downstream use.

If this is the case, then the R port needs to be updated to exercise its own control over the compiler it uses, and not just rely on whatever fallback the framework picks for it, as this will on occasion change as default versions get bumped.

[Chris Jones <jonesc@…>]

In 6b1e7fc361c5e19dc5f7e53cc5073fb144af9720/macports-ports (master):

R: blacklist macport-ports-16+
Closes: #67144