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Only pass -pie when linking executables

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Passing -pie globally made the driver link Scrt1.o into shared
libraries, which fails with an undefined reference to main.
This commit is contained in:
andrew
2026-06-14 16:20:48 -04:00
parent 995ddf329f
commit eb9925ffec
1 changed files with 6 additions and 2 deletions
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CMakeLists.txt
+6 -2
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@@ -51,12 +51,16 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
add_compile_options("-Wno-maybe-uninitialized") add_compile_options("-Wno-maybe-uninitialized")
endif() endif()
set(full_relro_flags "-pie;LINKER:-z,relro,-z,now,-z,noexecstack") set(relro_flags "LINKER:-z,relro,-z,now,-z,noexecstack")
set(full_relro_flags "-pie;${relro_flags}")
cmake_push_check_state() cmake_push_check_state()
list(APPEND CMAKE_REQUIRED_LINK_OPTIONS ${full_relro_flags}) list(APPEND CMAKE_REQUIRED_LINK_OPTIONS ${full_relro_flags})
check_cxx_source_compiles("int main(){}" HAS_FULL_RELRO FAIL_REGEX "warning:") check_cxx_source_compiles("int main(){}" HAS_FULL_RELRO FAIL_REGEX "warning:")
if(HAS_FULL_RELRO) if(HAS_FULL_RELRO)
add_link_options(${full_relro_flags}) # -pie only applies to executables; passing it when linking a shared library
# makes the driver pull in Scrt1.o, which requires main.
add_link_options("$<$<STREQUAL:$<TARGET_PROPERTY:TYPE>,EXECUTABLE>:-pie>"
${relro_flags})
endif() endif()
cmake_pop_check_state() cmake_pop_check_state()