how to custom the static library ar process

Code
1

I want to build a static library name xcrt that use CMake,

SET(CMAKE_AR  "i386-elf-ar")
set(CMAKE_STATIC_LINKER_FLAGS rc CACHE STRING "" FORCE)
add_library(xcrt  STATIC
	xcrt_SRC}
)

when build, it executes the command:

i386-elf-ar cr libxcrt.a rc CMakeFiles/xcrt.dir/x86/crt1.asm.o CMakeFiles/xcrt.dir/x86/crti.asm.o CMakeFiles/xcrt.dir/x86/crtn.asm.o

I don’t want the cr option to follow after the i386-elf-ar command, I just want to use rc option to replace cr option, I had tried to set follow statement in CMakeList.txt.

set(CMAKE_C_CREATE_STATIC_LIBRARY "<CMAKE_AR> rc <TARGET> <LINK_FLAGS> <OBJECTS> ")
set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> rc <TARGET> <LINK_FLAGS> <OBJECTS>")

but it does not work at all, what I should do when I need to use rc option to replace cr option? thanks a lot!

2

here is files and subdirectory in the xcrt directory:

├── CMakeLists.txt
├── Makefile
└── x86
    ├── CMakeLists.txt
    ├── Makefile
    ├── crt1.asm
    ├── crti.asm
    └── crtn.asm

I had tried to add following statement in CMakeList.txt.

set(CMAKE_C_ARCHIVE_CREATE   " Scr   ")
set(CMAKE_CXX_ARCHIVE_CREATE " Scr   ")
set(CMAKE_C_ARCHIVE_FINISH   " -no_warning_for_no_symbols -c ")
set(CMAKE_CXX_ARCHIVE_FINISH " -no_warning_for_no_symbols -c ")
set(CMAKE_ASM_ARCHIVE_CREATE   " Scr   ")
set(CMAKE_ASM_ARCHIVE_FINISH   " -no_warning_for_no_symbols -c ")
set(CMAKE_ASM_NASM_ARCHIVE_CREATE   " Scr   ")
set(CMAKE_ASM_NASM_ARCHIVE_FINISH   " -no_warning_for_no_symbols -c ")

but It still does not change anything about the ar process, when execute make command, it still executes the command:

i386-elf-ar cr libxcrt.a rc CMakeFiles/xcrt.dir/x86/crt1.asm.o CMakeFiles/xcrt.dir/x86/crti.asm.o CMakeFiles/xcrt.dir/x86/crtn.asm.o

I don’t know why, could anyone helps me, thanks a lot!

3

You want to look into CMAKE_TOOLCHAIN_FILES. What you are currently doing isn’t correct at all.

4

after multiple tries, I found the reason, because my source files are all .asm files, I must use CMAKE_ASM_NASM_CREATE_STATIC_LIBRARY, not CMAKE_C_CREATE_STATIC_LIBRARY, you can find CMAKE_DEPENDS_LANGUAGES from the file which in /CMakeFiles/*.dir/DependInfo.cmake,the worked ar process is:

set(CMAKE_AR  "i386-elf-ar")
set(CMAKE_ASM_NASM_CREATE_STATIC_LIBRARY "<CMAKE_AR> rc <TARGET> <OBJECTS> ")

hope it can help someone!