[libc] Introduce a full build mode CMake option.
This option will build LLVM libc as a full libc by itself. In this mode,
it is not expected that it will be mixed with other libcs. The
non-full-build mode will be the default LLVM libc build mode. In a future
where LLVM libc is complete enough, the full libc build will be made the
default mode.
GitOrigin-RevId: e9e788d145f57bcf815b9797191c1560ba39b842
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0bf1e3b..95c3b6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,6 +62,8 @@
(pass -DLLVM_LIBC_ENABLE_LINTING=ON to cmake).")
endif()
+option(LLVM_LIBC_FULL_BUILD "Build and test LLVM libc as if it is the full libc" OFF)
+
include(CMakeParseArguments)
include(LLVMLibCRules)
include(LLVMLibCCheckCpuFeatures)
@@ -81,18 +83,22 @@
list(APPEND TARGET_ENTRYPOINT_NAME_LIST ${entrypoint_name})
endforeach()
-# We need to set up hdrgen first since other targets depend on it.
-add_subdirectory(utils/LibcTableGenUtil)
-add_subdirectory(utils/HdrGen)
+if(LLVM_LIBC_FULL_BUILD)
+ # We need to set up hdrgen first since other targets depend on it.
+ add_subdirectory(utils/LibcTableGenUtil)
+ add_subdirectory(utils/HdrGen)
+endif()
add_subdirectory(include)
add_subdirectory(config)
add_subdirectory(src)
add_subdirectory(utils)
-# The loader can potentially depend on the library components so add it
-# after the library implementation directories.
-add_subdirectory(loader)
+if(LLVM_LIBC_FULL_BUILD)
+ # The loader can potentially depend on the library components so add it
+ # after the library implementation directories.
+ add_subdirectory(loader)
+endif()
# The lib and test directories are added at the very end as tests
# and libraries potentially draw from the components present in all
diff --git a/cmake/modules/LLVMLibCHeaderRules.cmake b/cmake/modules/LLVMLibCHeaderRules.cmake
index ab1f6fe..c9bf466 100644
--- a/cmake/modules/LLVMLibCHeaderRules.cmake
+++ b/cmake/modules/LLVMLibCHeaderRules.cmake
@@ -58,6 +58,12 @@
"PARAMS;DATA_FILES;DEPENDS" # Multi value arguments
${ARGN}
)
+ get_fq_target_name(${target_name} fq_target_name)
+ if(NOT LLVM_LIBC_FULL_BUILD)
+ # We don't want to use generated headers if we are doing a non-full-build.
+ add_custom_target(${fq_target_name})
+ return()
+ endif()
if(NOT ADD_GEN_HDR_DEF_FILE)
message(FATAL_ERROR "`add_gen_hdr` rule requires DEF_FILE to be specified.")
endif()
@@ -100,7 +106,6 @@
${LIBC_TABLEGEN_EXE} ${LIBC_TABLEGEN_TARGET}
)
- get_fq_target_name(${target_name} fq_target_name)
if(ADD_GEN_HDR_DEPENDS)
get_fq_deps_list(fq_deps_list ${ADD_GEN_HDR_DEPENDS})
endif()
diff --git a/config/linux/x86_64/entrypoints.txt b/config/linux/x86_64/entrypoints.txt
index 5e5c8fc..a3fffae 100644
--- a/config/linux/x86_64/entrypoints.txt
+++ b/config/linux/x86_64/entrypoints.txt
@@ -1,7 +1,4 @@
set(TARGET_LIBC_ENTRYPOINTS
- # assert.h entrypoints
- libc.src.assert.__assert_fail
-
# ctype.h entrypoints
libc.src.ctype.isalnum
libc.src.ctype.isalpha
@@ -23,23 +20,6 @@
# errno.h entrypoints
libc.src.errno.__errno_location
- # signal.h entrypoints
- libc.src.signal.raise
- libc.src.signal.sigaction
- libc.src.signal.sigdelset
- libc.src.signal.sigaddset
- libc.src.signal.sigemptyset
- libc.src.signal.sigprocmask
- libc.src.signal.sigfillset
- libc.src.signal.signal
-
- # stdlib.h entrypoints
- libc.src.stdlib._Exit
- libc.src.stdlib.abort
- libc.src.stdlib.abs
- libc.src.stdlib.labs
- libc.src.stdlib.llabs
-
# string.h entrypoints
libc.src.string.bzero
libc.src.string.memchr
@@ -62,24 +42,6 @@
libc.src.string.strstr
libc.src.string.strtok
libc.src.string.strtok_r
-
- # sys/mman.h entrypoints
- libc.src.sys.mman.mmap
- libc.src.sys.mman.munmap
-
- # threads.h entrypoints
- libc.src.threads.call_once
- libc.src.threads.mtx_init
- libc.src.threads.mtx_lock
- libc.src.threads.mtx_unlock
- libc.src.threads.thrd_create
- libc.src.threads.thrd_join
-
- # time.h entrypoints
- libc.src.time.mktime
-
- # unistd.h entrypoints
- libc.src.unistd.write
)
set(TARGET_LIBM_ENTRYPOINTS
@@ -179,6 +141,48 @@
libc.src.math.truncl
)
+if(LLVM_LIBC_FULL_BUILD)
+ list(APPEND TARGET_LIBC_ENTRYPOINTS
+ # assert.h entrypoints
+ libc.src.assert.__assert_fail
+
+ # stdlib.h entrypoints
+ libc.src.stdlib._Exit
+ libc.src.stdlib.abort
+ libc.src.stdlib.abs
+ libc.src.stdlib.labs
+ libc.src.stdlib.llabs
+
+ # signal.h entrypoints
+ libc.src.signal.raise
+ libc.src.signal.sigaction
+ libc.src.signal.sigdelset
+ libc.src.signal.sigaddset
+ libc.src.signal.sigemptyset
+ libc.src.signal.sigprocmask
+ libc.src.signal.sigfillset
+ libc.src.signal.signal
+
+ # sys/mman.h entrypoints
+ libc.src.sys.mman.mmap
+ libc.src.sys.mman.munmap
+
+ # threads.h entrypoints
+ libc.src.threads.call_once
+ libc.src.threads.mtx_init
+ libc.src.threads.mtx_lock
+ libc.src.threads.mtx_unlock
+ libc.src.threads.thrd_create
+ libc.src.threads.thrd_join
+
+ # time.h entrypoints
+ libc.src.time.mktime
+
+ # unistd.h entrypoints
+ libc.src.unistd.write
+ )
+endif()
+
set(TARGET_LLVMLIBC_ENTRYPOINTS
${TARGET_LIBC_ENTRYPOINTS}
${TARGET_LIBM_ENTRYPOINTS}
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8f389bc..db27021 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,16 +1,21 @@
-add_subdirectory(assert)
+add_subdirectory(__support)
+
add_subdirectory(ctype)
add_subdirectory(errno)
add_subdirectory(fenv)
add_subdirectory(math)
+add_subdirectory(string)
+
+if(NOT LLVM_LIBC_FULL_BUILD)
+ return()
+endif()
+
+add_subdirectory(assert)
add_subdirectory(signal)
add_subdirectory(stdio)
add_subdirectory(stdlib)
-add_subdirectory(string)
# TODO: Add this target conditional to the target OS.
add_subdirectory(sys)
add_subdirectory(threads)
add_subdirectory(time)
add_subdirectory(unistd)
-
-add_subdirectory(__support)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 100c8ff..1187ba5 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -7,7 +7,12 @@
add_custom_target(check-libc)
add_custom_target(exhaustive-check-libc)
-add_subdirectory(config)
-add_subdirectory(loader)
add_subdirectory(src)
add_subdirectory(utils)
+
+if(NOT LLVM_LIBC_FULL_BUILD)
+ return()
+endif()
+
+add_subdirectory(config)
+add_subdirectory(loader)
diff --git a/test/src/CMakeLists.txt b/test/src/CMakeLists.txt
index 291925f..8638dea 100644
--- a/test/src/CMakeLists.txt
+++ b/test/src/CMakeLists.txt
@@ -1,8 +1,13 @@
-add_subdirectory(assert)
add_subdirectory(ctype)
add_subdirectory(errno)
add_subdirectory(fenv)
add_subdirectory(math)
+
+if(NOT LLVM_LIBC_FULL_BUILD)
+ return()
+endif()
+
+add_subdirectory(assert)
add_subdirectory(signal)
add_subdirectory(stdio)
add_subdirectory(stdlib)
diff --git a/test/utils/CMakeLists.txt b/test/utils/CMakeLists.txt
index c796961..b658c82 100644
--- a/test/utils/CMakeLists.txt
+++ b/test/utils/CMakeLists.txt
@@ -1,3 +1,8 @@
add_subdirectory(FPUtil)
add_subdirectory(CPP)
+
+if(NOT LLVM_LIBC_FULL_BUILD)
+ return()
+endif()
+
add_subdirectory(tools)
diff --git a/utils/CMakeLists.txt b/utils/CMakeLists.txt
index dfee264..6655cb1 100644
--- a/utils/CMakeLists.txt
+++ b/utils/CMakeLists.txt
@@ -2,5 +2,8 @@
add_subdirectory(FPUtil)
add_subdirectory(MPFRWrapper)
add_subdirectory(testutils)
-add_subdirectory(tools)
add_subdirectory(UnitTest)
+
+if(LLVM_LIBC_FULL_BUILD)
+ add_subdirectory(tools)
+endif()
