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Compile internal SQLite library with -ffunction-sections

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When building with SQLITECPP_INTERNAL_SQLITE=ON the SQLite amalgamation
source is used for generating the library. Using one big source file
means all the library code will be put in a single section. When
building statically linked executables the entire section will be
linked even if a small portion of the library is actually used.

This commit addresses this issue by setting the -ffunction-sections
compiler option when building the library. As each function is placed in
a section of its own the linker, when passed the --gc-sections, will
throw away unused sections (functions) and reduce the executable size.
This commit is contained in:
Micha Kalfon 2020-08-23 13:05:25 +03:00
parent 4e3d36af2d
commit 6f9075d511
1 changed files with 5 additions and 0 deletions
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5
sqlite3/CMakeLists.txt
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@ -29,6 +29,11 @@ endif (SQLITE_ENABLE_JSON1)
if (UNIX AND (CMAKE_COMPILER_IS_GNUCXX OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang"))
set_target_properties(sqlite3 PROPERTIES COMPILE_FLAGS "-fPIC")
# Put each function in its own section to allow the linker garbage
# collection to remove unused section and produced a smaller
# statically-lined executables.
target_compile_options(sqlite3 PRIVATE "-ffunction-sections")
endif (UNIX AND (CMAKE_COMPILER_IS_GNUCXX OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang"))
if (UNIX AND CMAKE_COMPILER_IS_GNUCXX)