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CMake: reduces binary size

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Carter Li
2026-10-03 01:36:12 +08:00
parent 3d0747b56d
commit 5f65515c3c
1 changed files with 26 additions and 0 deletions
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CMakeLists.txt
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@@ -280,6 +280,32 @@ if(ENABLE_LTO AND NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
endif()
endif()
# Release and MinSizeRel drop the symbol table and the unwind metadata; Debug and RelWithDebInfo keep
# both, so those stay fully debuggable. CMake does not strip MinSizeRel on its own.
if(CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "MinSizeRel")
# The symbol table is dead weight: 437 KB (16%) of a MinGW build, 91 KB (3%) of a GCC build.
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-s")
# Drops .eh_frame / .eh_frame_hdr on ELF (74 KB) and .pdata / .xdata on PE (26 KB). Every C++
# translation unit here is built with -fno-exceptions -fno-rtti and no source file contains a
# single try / catch, so no exception can ever unwind through these frames. The only loss is
# backtrace() / gdb / perf / crash-dump stack walking in a release binary.
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-asynchronous-unwind-tables")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-asynchronous-unwind-tables")
if(NOT WIN32 AND NOT APPLE AND NOT ANDROID)
# Drops .rela.dyn (250 KB) and .data.rel.ro (169 KB) on ELF and removes every load-time
# relocation, so startup gets faster too. The cost is ASLR, and a distro that builds with
# hardening=+all / %_hardened_build passes -fPIE -pie and overrides this anyway.
# Skipped on Windows (PE has no PIE, clang warns "-no-pie unused"), on macOS (Mach-O has no
# .rela.dyn, and turning PIE off fights the code-signing defaults) and on Android, which
# rejects non-PIE executables outright.
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-pie")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-pie")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -no-pie")
endif()
endif()
#######################
# Target FS structure #
#######################