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[SDK][CMAKE] Link libgcc_eh into C++ targets when available

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The build uses -nostdlib which prevents GCC from auto-linking libgcc_eh.a. This library provides the SEH unwind symbols (_Unwind_Resume, __emutls_get_address, etc.) needed by C++ exception handling. Without it, any C++ target compiled with -fexceptions fails to link with undefined references to these symbols.

Add a libgcc_eh INTERFACE target that conditionally pulls in libgcc_eh.a when the toolchain provides it (as on SEH-enabled x86_64), falling back to a no-op otherwise (SJLJ/DWARF toolchains).
This commit is contained in:
Ahmed Arif
2026-06-08 16:51:52 +00:00
committed by Timo Kreuzer
parent 34bf566dd9
commit 129623416c
1 changed files with 9 additions and 2 deletions
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sdk/cmake/gcc.cmake
+9 -2
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@@ -657,12 +657,19 @@ set_target_properties(libgcc PROPERTIES IMPORTED_LOCATION ${LIBGCC_LOCATION})
# libgcc needs kernel32 and winpthread (an appropriate CRT must be linked manually)
target_link_libraries(libgcc INTERFACE libwinpthread libkernel32)
add_library(libgcc_eh INTERFACE)
target_link_libraries(libgcc_eh INTERFACE libgcc)
# only add libgcc_eh.a if it exists (SEH toolchains have it, SJLJ/DWARF do not)
execute_process(COMMAND ${GXX_EXECUTABLE} -print-file-name=libgcc_eh.a OUTPUT_VARIABLE _LIBGCC_EH_PATH OUTPUT_STRIP_TRAILING_WHITESPACE)
if(EXISTS "${_LIBGCC_EH_PATH}")
target_link_libraries(libgcc_eh INTERFACE "${_LIBGCC_EH_PATH}")
endif()
add_library(libsupc++ STATIC IMPORTED GLOBAL)
execute_process(COMMAND ${GXX_EXECUTABLE} -print-file-name=libsupc++.a OUTPUT_VARIABLE LIBSUPCXX_LOCATION)
string(STRIP ${LIBSUPCXX_LOCATION} LIBSUPCXX_LOCATION)
set_target_properties(libsupc++ PROPERTIES IMPORTED_LOCATION ${LIBSUPCXX_LOCATION})
# libsupc++ requires libgcc and stdc++compat
target_link_libraries(libsupc++ INTERFACE libgcc stdc++compat)
target_link_libraries(libsupc++ INTERFACE libgcc_eh libgcc stdc++compat)
add_library(libmingwex STATIC IMPORTED)
execute_process(COMMAND ${GXX_EXECUTABLE} -print-file-name=libmingwex.a OUTPUT_VARIABLE LIBMINGWEX_LOCATION)