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Add support in CMake to statically link the C++ standard library.

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It is sometimes useful to have the C++ standard library linked into the
assembly when compiling clang, particularly when distributing a compiler
onto systems that don't have a copy of stdlibc++ or libc++ installed.

This functionality should work with either GCC or Clang as the host
compiler, though statically linking libc++ (as may be required for
licensing purposes) is only possible if the host compiler is Clang with
a copy of libc++ available.

Differential Revision: https://reviews.llvm.org/D65603

llvm-svn: 368907
This commit is contained in:
Erich Keane 2019-08-14 19:55:59 +00:00
parent 3cdc6b371a
commit 8d0fafd361
3 changed files with 26 additions and 0 deletions
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1
CMakeLists.txt
View File

@ -390,6 +390,7 @@ else()
option(LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY "Compile with -fmodules-local-submodule-visibility." ON)
endif()
option(LLVM_ENABLE_LIBCXX "Use libc++ if available." OFF)
option(LLVM_STATIC_LINK_CXX_STDLIB "Statically link the standard library." OFF)
option(LLVM_ENABLE_LLD "Use lld as C and C++ linker." OFF)
option(LLVM_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
option(LLVM_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)

20
cmake/modules/HandleLLVMStdlib.cmake
View File

@ -31,4 +31,24 @@ if(NOT DEFINED LLVM_STDLIB_HANDLED)
message(WARNING "Not sure how to specify libc++ for this compiler")
endif()
endif()
if(LLVM_STATIC_LINK_CXX_STDLIB)
if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
check_cxx_compiler_flag("-static-libstdc++"
CXX_COMPILER_SUPPORTS_STATIC_STDLIB)
check_linker_flag("-static-libstdc++" CXX_LINKER_SUPPORTS_STATIC_STDLIB)
if(CXX_COMPILER_SUPPORTS_STATIC_STDLIB AND
CXX_LINKER_SUPPORTS_STATIC_STDLIB)
append("-static-libstdc++"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS
CMAKE_MODULE_LINKER_FLAGS)
else()
message(WARNING
"Can't specify static linking for the C++ standard library")
endif()
else()
message(WARNING "Not sure how to specify static linking of C++ standard "
"library for this compiler")
endif()
endif()
endif()

5
docs/CMake.rst
View File

@ -431,6 +431,11 @@ LLVM-specific variables
passed to invocations of both so that the project is built using libc++
instead of stdlibc++. Defaults to OFF.
**LLVM_STATIC_LINK_CXX_STDLIB**:BOOL
Statically link to the C++ standard library if possible. This uses the flag
"-static-libstdc++", but a Clang host compiler will statically link to libc++
if used in conjuction with the **LLVM_ENABLE_LIBCXX** flag. Defaults to OFF.
**LLVM_ENABLE_LLD**:BOOL
This option is equivalent to `-DLLVM_USE_LINKER=lld`, except during a 2-stage
build where a dependency is added from the first stage to the second ensuring