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CMake: fix CI -- export vendored Eigen so Ceres' install(EXPORT) resolves
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Browse Source 
A clean configure failed at generation:
  install(EXPORT "CeresExport" ...) includes target "ceres" which requires
  target "eigen" that is not in any export set.

Ceres' install(EXPORT CeresExport) is unconditional, and its ceres target
transitively links the eigen target. As a FetchContent subproject Eigen leaves
EIGEN_BUILD_CMAKE_PACKAGE OFF (it defaults to PROJECT_IS_TOP_LEVEL), so its
install(EXPORT Eigen3Targets) never runs and eigen ends up in no installed
export set. Force EIGEN_BUILD_CMAKE_PACKAGE ON so eigen is exported and Ceres'
export validates. Install/export-only change; the build is unaffected.

Verified with a clean configure (fresh CMakeCache): configure + generate now
succeed where they previously errored.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
leonarski_f
2026-06-20 13:38:46 +02:00
parent cd394c5249
commit d4d2d0d8ad
1 changed files with 5 additions and 0 deletions
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CMakeLists.txt
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@@ -221,6 +221,11 @@ ADD_COMPILE_DEFINITIONS(JFJOCH_USE_FFTW)
SET(EIGEN_BUILD_DOC OFF CACHE BOOL "" FORCE)
SET(EIGEN_BUILD_TESTING OFF CACHE BOOL "" FORCE)
SET(EIGEN_BUILD_PKGCONFIG OFF CACHE BOOL "" FORCE)
# Ceres' install(EXPORT CeresExport) is unconditional and its ceres target transitively links the
# eigen target, so eigen must live in an installed export set or generation fails ("eigen is not in
# any export set"). As a subproject Eigen defaults EIGEN_BUILD_CMAKE_PACKAGE OFF, which skips its
# install(EXPORT Eigen3Targets); force it ON so eigen is exported and Ceres' export resolves.
SET(EIGEN_BUILD_CMAKE_PACKAGE ON CACHE BOOL "" FORCE)
FetchContent_Declare(Eigen3
GIT_REPOSITORY https://gitlab.com/libeigen/eigen.git
GIT_TAG 5.0.1