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CMake: Handle C++ API dependencies conditionally #412

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CMake: Handle C++ API dependencies conditionally #412

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d45e57a
Don't check and install bundled Boost headers if CXX_API not required
Growl1234 Apr 19, 2026
81c457a
CMake: Export C++ API dependencies conditionally
Growl1234 Jun 23, 2026
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4 changes: 3 additions & 1 deletion cmake/libint2-config.cmake.in
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,8 @@ list(PREPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})
# check library language component
include(CMakeFindDependencyMacro)

set(LIBINT2_REQUIRE_CXX_API @LIBINT2_REQUIRE_CXX_API@)
if(LIBINT2_REQUIRE_CXX_API)
if(NOT TARGET Eigen3::Eigen)
set(Eigen3_CONFIG @Eigen3_CONFIG@)
if (NOT Eigen3_CONFIG OR NOT EXISTS ${Eigen3_CONFIG})
Expand All @@ -65,7 +67,6 @@ include(CMakeFindDependencyMacro)
find_dependency(Eigen3 REQUIRED HINTS "${Eigen3_DIR}")
endif()
endif()

if (@LIBINT_HAS_SYSTEM_BOOST_PREPROCESSOR_VARIADICS@) # LIBINT_HAS_SYSTEM_BOOST_PREPROCESSOR_VARIADICS
# Boost headers _not_ unpacked to within `include/libint2/`
if (NOT TARGET Boost::headers)
Expand All @@ -83,6 +84,7 @@ include(CMakeFindDependencyMacro)
message(STATUS "Boost detected. satisfied by headers bundled with ${L2} distribution")
endif()
endif()
endif()

# check orderings, AM, & derivatives components
# * LIBINT2_SHGAUSS_ORDERING = @LIBINT2_SHGAUSS_ORDERING@
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2 changes: 1 addition & 1 deletion export/CMakeLists.txt.export
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Expand Up @@ -796,7 +796,7 @@ install(CODE "
")

# install bundled Boost headers if needed
if (NOT LIBINT_HAS_SYSTEM_BOOST_PREPROCESSOR_VARIADICS)
if (LIBINT2_REQUIRE_CXX_API AND NOT LIBINT_HAS_SYSTEM_BOOST_PREPROCESSOR_VARIADICS)
install(
DIRECTORY ${PROJECT_BINARY_DIR}/include/libint2/boost
DESTINATION "${LIBINT2_INSTALL_INCLUDEDIR}/libint2"
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