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GH-55267: [C++][R] Arrow 26.0.0 fails to build on CRAN macOS builders: bundled simdjson C++20 concepts don't compile with the macOS 11 SDK #55273

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thisisnic merged 4 commits into from
Oct 27, 2026
+13 −4
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GH-55267: [C++][R] Arrow 26.0.0 fails to build on CRAN macOS builders: bundled simdjson C++20 concepts don't compile with the macOS 11 SDK #55273

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fa3cc7a
make regex more permissive
thisisnic Oct 26, 2026
0cc3986
Update regex to match all MacOSX SDKs which are affected
thisisnic Oct 26, 2026
99ff206
Trim comment
thisisnic Oct 26, 2026
b435bb6
Too many words
thisisnic Oct 27, 2026
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17 changes: 13 additions & 4 deletions cpp/cmake_modules/ThirdpartyToolchain.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -2861,10 +2861,19 @@ function(build_simdjson)

target_compile_definitions(simdjson PUBLIC SIMDJSON_EXCEPTIONS=0)

# The macOS 11.3 SDK has incomplete C++20 concepts support, which prevents
# simdjson headers from compiling. Disable simdjson concepts for this SDK.
if(CMAKE_OSX_SYSROOT AND CMAKE_OSX_SYSROOT MATCHES "MacOSX11\\.3\\.sdk$")
message(STATUS "Disabling simdjson concepts for macOS SDK 11.3")
# macOS SDKs before 13.3 ship a libc++ without <ranges> and with incomplete
# <concepts>, but simdjson enables its C++20 concepts API from the compiler's
# __cpp_concepts alone, so its headers fail to compile against those SDKs
# (GH-55267). Disable simdjson concepts for them. Arrow doesn't use that part
# of the simdjson API. simdjson considers these SDKs unsupported and won't fix
# this upstream, see https://github.com/simdjson/simdjson/issues/2787.
#
# The SDK directory name may omit the minor version ("MacOSX11.sdk" on CRAN,
# "MacOSX11.3.sdk" in our as-cran CI job), so match both forms. This treats
# "MacOSX13.sdk" as too old, which is harmless.
if(CMAKE_OSX_SYSROOT AND CMAKE_OSX_SYSROOT MATCHES
"MacOSX(1[0-2](\\.[0-9]+)?|13(\\.[0-2])?)\\.sdk$")
message(STATUS "Disabling simdjson concepts for macOS SDK older than 13.3")
target_compile_definitions(simdjson PUBLIC SIMDJSON_CONCEPT_DISABLED=1)
endif()

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