[Bug 293546] devel/llvm22: fix parallel build

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293546

            Bug ID: 293546
           Summary: devel/llvm22: fix parallel build
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: brooks@FreeBSD.org
          Reporter: eric@camachat.org
             Flags: maintainer-feedback?(brooks@FreeBSD.org)
          Assignee: brooks@FreeBSD.org

Created attachment 268480
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=268480&action=edit
fix parallel build

Fix parallel build error on 8-core/16-thread CPU:

# cause:

- Why this file? Polly is built as part of the LLVM tools subtree, and its
CMakeLists.txt handles the compilation of its transform passes (like
ScopInliner.cpp, which triggered your error). The existing code there already
includes a conditional dependency on older TableGen targets (e.g.,
intrinsics_gen from a 2017 fix for a similar race). However, it lacks one for
the new TargetLibraryInfo.inc generator introduced in LLVM commit c9f5734 (PR
#165009, around November 2025), which refactored TargetLibraryInfo from a .def
file to TableGen-based .inc generation. Without this, high-parallelism builds
(common on FreeBSD with samu or Ninja) can attempt to compile Polly sources
before the .inc file is ready, leading to the "file not found" error.

 - Edge cases where this might not apply: If you're building LLVM from a custom
Git clone (not the FreeBSD port), the path would be
<your-llvm-source-dir>/polly/lib/CMakeLists.txt. Also, if the port has been
updated post-February 2026 to include this fix (check the port's changelog or
pkg info llvm22), you might not need to modify anything. In rare cases on very
low-RAM systems, the error could masquerade as a missing file due to OOM kills
during TableGen, but your znver4 setup suggests parallelism is the culprit.

 - Related considerations: Modifying this file directly in the work directory
is a temporary fix—it will be wiped out on make clean or a fresh port fetch.
For a permanent solution in the FreeBSD ports ecosystem, create a patch file
(e.g., via make makepatch) and submit it to the maintainer (Brooks Davis) or
via Bugzilla/PR. This ensures it's upstreamed or included in future port
revisions. If you're cross-compiling or using Poudriere, apply the patch in
your custom repository.


# error log:

samu: job failed with status 1: /usr/bin/c++ -DLLVM_BUILD_STATIC -D_GNU_SOURCE
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-I/wrkdirs/usr/ports/devel/llvm22/work-default/.build/tools/polly/lib
-I/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/polly/lib
-I/wrkdirs/usr/ports/devel/llvm22/work-default/.build/tools/polly/include
-I/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/polly/lib/External
-I/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/polly/lib/External/pet/include
-I/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/polly/lib/External/isl/include
-I/wrkdirs/usr/ports/devel/llvm22/work-default/.build/tools/polly/lib/External/isl/include
-I/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/polly/include
-I/wrkdirs/usr/ports/devel/llvm22/work-default/.build/include
-I/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/llvm/include
-O3 -pipe -mtune=znver4 -march=znver4 -fstack-protector-strong -isystem
/usr/local/include -fno-strict-aliasing -march=znver4  -isystem
/usr/local/include -fPIC -fno-semantic-interposition
-fvisibility-inlines-hidden -Werror=date-time
-Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter
-Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic
-Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough
-Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor
-Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion
-Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported
-fdiagnostics-color -ffunction-sections -fdata-sections -fno-exceptions
-fno-rtti -O3 -pipe -mtune=znver4 -march=znver4 -fstack-protector-strong
-isystem /usr/local/include -fno-strict-aliasing -march=znver4  -isystem
/usr/local/include  -DNDEBUG -std=c++17 -fno-exceptions -funwind-tables -MD -MT
tools/polly/lib/CMakeFiles/obj.Polly.dir/Transform/ScopInliner.cpp.o -MF
tools/polly/lib/CMakeFiles/obj.Polly.dir/Transform/ScopInliner.cpp.o.d -o
tools/polly/lib/CMakeFiles/obj.Polly.dir/Transform/ScopInliner.cpp.o -c
/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/polly/lib/Transform/ScopInliner.cpp
In file included from
/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/polly/lib/Transform/ScopInliner.cpp:16:
In file included from
/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/polly/include/polly/ScopInliner.h:12:
In file included from
/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/llvm/include/llvm/Analysis/CGSCCPassManager.h:92:
In file included from
/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/llvm/include/llvm/Analysis/LazyCallGraph.h:46:
/wrkdirs/usr/ports/devel/llvm22/work-default/llvm-project-22.1.0.src/llvm/include/llvm/Analysis/TargetLibraryInfo.h:75:10:
fatal error: 'llvm/Analysis/TargetLibraryInfo.inc' file not found
   75 | #include "llvm/Analysis/TargetLibraryInfo.inc"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

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