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Fixing static build #54

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Merged
msoos merged 1 commit into from
May 22, 2026
Merged

Fixing static build #54

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22 changes: 13 additions & 9 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -85,15 +85,19 @@ option(BUILD_SHARED_LIBS "Build the shared library" ON)
option(STATIC_BINARY "Link the arjun binary fully statically" OFF)

if(STATIC_BINARY AND ${CMAKE_SYSTEM_NAME} MATCHES "Linux")
message(STATUS "Linking arjun binary statically")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")

# gcc's spec uses linker-script wrappers (libgcc_s_asneeded.so,
# libatomic_asneeded.so) that have no static counterpart. CMake captures
# them in CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES and propagates them to
# consumers — under -static the linker then fails to find libgcc_s_asneeded.a.
list(REMOVE_ITEM CMAKE_C_IMPLICIT_LINK_LIBRARIES gcc_s_asneeded atomic_asneeded)
list(REMOVE_ITEM CMAKE_CXX_IMPLICIT_LINK_LIBRARIES gcc_s atomic_asneeded)
message(STATUS "Linking arjun binary fully statically")
set(CMAKE_EXE_LINKER_FLAGS
"${CMAKE_EXE_LINKER_FLAGS} -static -static-libgcc -static-libstdc++")

# CMake probes the compiler without -static, so its captured
# CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES name the *shared* libgcc/libatomic
# variants (gcc_s, gcc_s_asneeded, atomic_asneeded) whose .a counterparts
# don't exist. Under -static -static-libgcc -static-libstdc++ the gcc/clang
# driver links libgcc.a + libgcc_eh.a + libstdc++.a itself, so we don't
# need CMake to re-inject anything. Clear both lists outright rather than
# playing whack-a-mole with distro-specific names.
set(CMAKE_C_IMPLICIT_LINK_LIBRARIES "")
set(CMAKE_CXX_IMPLICIT_LINK_LIBRARIES "")
endif()

set(THREADS_PREFER_PTHREAD_FLAG ON)
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