[libc] Install startup files with the install-libc target.

[jeffbailey]

libc/loader/linux/CMakeLists.txt

92

Discussed live: we will switch to "startup" rather than "loader" throughout in a subsequent CL.

libc/CMakeLists.txt

 
 set(LIBC_TARGET)
 set(LIBC_COMPONENT)
 set(LIBC_INSTALL_DEPENDS)
 set(LIBC_INSTALL_TARGET)
 if(LLVM_LIBC_FULL_BUILD)
   set(LIBC_TARGET libc)
   set(LIBC_COMPONENT libc)
-  set(LIBC_INSTALL_DEPENDS "libc;libc-headers")
+  set(LIBC_INSTALL_DEPENDS "libc;libc-headers;libc-startup")
   set(LIBC_INSTALL_TARGET install-libc)
   set(LIBC_ARCHIVE_NAME c)
 else()
   set(LIBC_TARGET llvmlibc)
   set(LIBC_COMPONENT llvmlibc)
   set(LIBC_INSTALL_DEPENDS llvmlibc)
   set(LIBC_INSTALL_TARGET install-llvmlibc)
   set(LIBC_ARCHIVE_NAME llvmlibc)

libc/loader/linux/CMakeLists.txt

SRC
     crti.cpp
 )
 
 add_loader_object(
   crtn
   SRC
     crtn.cpp
 )
+
+add_custom_target(libc-startup)
+set(startup_components crt1 crti crtn)
+foreach(target IN LISTS startup_components)
+  set(fq_target_name libc.loader.linux.${target})
+  add_dependencies(libc-startup ${fq_target_name})
+  get_target_property(loader_object ${fq_target_name} LOADER_OBJECT)
+  install(FILES ${loader_object}
+          DESTINATION ${CMAKE_INSTALL_LIBDIR}
+          COMPONENT ${LIBC_COMPONENT})
+endforeach()