blob: 623ed774be7270476246fa26bf569155d9b56534 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
# ------------------------------------------------------------------------------
# Architecture and OS definitions.
#
# The correct target OS and architecture to build the libc for is deduced here.
# When possible, we also setup appropriate compile options for the target
# platform.
# ------------------------------------------------------------------------------
if(LIBC_GPU_BUILD OR LIBC_GPU_ARCHITECTURES)
# We set the generic target and OS to "gpu" here. More specific defintions
# for the exact target GPU are set up in prepare_libc_gpu_build.cmake.
set(LIBC_TARGET_OS "gpu")
set(LIBC_TARGET_ARCHITECTURE_IS_GPU TRUE)
set(LIBC_TARGET_ARCHITECTURE "gpu")
if(LIBC_TARGET_TRIPLE)
message(WARNING "LIBC_TARGET_TRIPLE is ignored as LIBC_GPU_BUILD is on. ")
endif()
return()
endif()
if(MSVC)
# If the compiler is visual c++ or equivalent, we will assume a host build.
set(LIBC_TARGET_OS ${CMAKE_HOST_SYSTEM_NAME})
string(TOLOWER ${LIBC_TARGET_OS} LIBC_TARGET_OS)
set(LIBC_TARGET_ARCHITECTURE ${CMAKE_HOST_SYSTEM_PROCESSOR})
if(LIBC_TARGET_TRIPLE)
message(WARNING "libc build: Detected MSVC or equivalent compiler; "
"LIBC_TARGET_TRIPLE is ignored and a host build is assumed.")
endif()
return()
endif()
# A helper function to get the architecture and system components from a target
# triple.
function(get_arch_and_system_from_triple triple arch_var sys_var)
string(REPLACE "-" ";" triple_comps ${triple})
list(LENGTH triple_comps triple_size)
if(triple_size LESS "3")
return()
endif()
math(EXPR system_index "${triple_size} - 2")
list(GET triple_comps 0 target_arch)
# The target_arch string can have sub-architecture suffixes which we want to
# remove. So, we regex-match the string and set target_arch to a cleaner
# value.
if(target_arch MATCHES "^mips")
set(target_arch "mips")
elseif(target_arch MATCHES "^arm")
# TODO(lntue): Shall we separate `arm64`? It is currently recognized as
# `arm` here.
set(target_arch "arm")
elseif(target_arch MATCHES "^aarch64")
set(target_arch "aarch64")
elseif(target_arch MATCHES "(x86_64)|(AMD64|amd64)|(^i.86$)")
set(target_arch "x86_64")
elseif(target_arch MATCHES "^(powerpc|ppc)")
set(target_arch "power")
elseif(target_arch MATCHES "^riscv32")
set(target_arch "riscv32")
elseif(target_arch MATCHES "^riscv64")
set(target_arch "riscv64")
else()
return()
endif()
set(${arch_var} ${target_arch} PARENT_SCOPE)
list(GET triple_comps ${system_index} target_sys)
# Correcting OS name for Apple's systems.
if(target_sys STREQUAL "apple")
list(GET triple_comps 2 target_sys)
endif()
# Strip version from `darwin###`
if(target_sys MATCHES "^darwin")
set(target_sys "darwin")
endif()
set(${sys_var} ${target_sys} PARENT_SCOPE)
endfunction(get_arch_and_system_from_triple)
execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version -v
RESULT_VARIABLE libc_compiler_info_result
OUTPUT_VARIABLE libc_compiler_info
ERROR_VARIABLE libc_compiler_info)
if(NOT (libc_compiler_info_result EQUAL "0"))
message(FATAL_ERROR "libc build: error querying compiler info from the "
"compiler: ${libc_compiler_info}")
endif()
string(REGEX MATCH "Target: [-_a-z0-9.]+[ \r\n]+"
libc_compiler_target_info ${libc_compiler_info})
if(NOT libc_compiler_target_info)
message(FATAL_ERROR "libc build: could not read compiler target info from:\n"
"${libc_compiler_info}")
endif()
string(STRIP ${libc_compiler_target_info} libc_compiler_target_info)
string(SUBSTRING ${libc_compiler_target_info} 8 -1 libc_compiler_triple)
get_arch_and_system_from_triple(${libc_compiler_triple}
compiler_arch compiler_sys)
if(NOT compiler_arch)
message(FATAL_ERROR
"libc build: Invalid or unknown libc compiler target triple: "
"${libc_compiler_triple}")
endif()
set(LIBC_TARGET_ARCHITECTURE ${compiler_arch})
set(LIBC_TARGET_OS ${compiler_sys})
set(LIBC_CROSSBUILD FALSE)
# One should not set LLVM_RUNTIMES_TARGET and LIBC_TARGET_TRIPLE
if(LLVM_RUNTIMES_TARGET AND LIBC_TARGET_TRIPLE)
message(FATAL_ERROR
"libc build: Specify only LLVM_RUNTIMES_TARGET if you are doing a "
"runtimes/bootstrap build. If you are doing a standalone build, "
"specify only LIBC_TARGET_TRIPLE.")
endif()
set(explicit_target_triple)
if(LLVM_RUNTIMES_TARGET)
set(explicit_target_triple ${LLVM_RUNTIMES_TARGET})
elseif(LIBC_TARGET_TRIPLE)
set(explicit_target_triple ${LIBC_TARGET_TRIPLE})
endif()
# The libc's target architecture and OS are set to match the compiler's default
# target triple above. However, one can explicitly set LIBC_TARGET_TRIPLE or
# LLVM_RUNTIMES_TARGET (for runtimes/bootstrap build). If one of them is set,
# then we will use that target triple to deduce libc's target OS and
# architecture.
if(explicit_target_triple)
get_arch_and_system_from_triple(${explicit_target_triple} libc_arch libc_sys)
if(NOT libc_arch)
message(FATAL_ERROR
"libc build: Invalid or unknown triple: ${explicit_target_triple}")
endif()
set(LIBC_TARGET_ARCHITECTURE ${libc_arch})
set(LIBC_TARGET_OS ${libc_sys})
endif()
if((LIBC_TARGET_OS STREQUAL "unknown") OR (LIBC_TARGET_OS STREQUAL "none"))
# We treat "unknown" and "none" systems as baremetal targets.
set(LIBC_TARGET_OS "baremetal")
endif()
# Set up some convenient vars to make conditionals easy to use in other parts of
# the libc CMake infrastructure. Also, this is where we also check if the target
# architecture is currently supported.
if(LIBC_TARGET_ARCHITECTURE STREQUAL "arm")
set(LIBC_TARGET_ARCHITECTURE_IS_ARM TRUE)
elseif(LIBC_TARGET_ARCHITECTURE STREQUAL "aarch64")
set(LIBC_TARGET_ARCHITECTURE_IS_AARCH64 TRUE)
elseif(LIBC_TARGET_ARCHITECTURE STREQUAL "x86_64")
set(LIBC_TARGET_ARCHITECTURE_IS_X86 TRUE)
elseif(LIBC_TARGET_ARCHITECTURE STREQUAL "riscv64")
set(LIBC_TARGET_ARCHITECTURE_IS_RISCV64 TRUE)
set(LIBC_TARGET_ARCHITECTURE "riscv")
elseif(LIBC_TARGET_ARCHITECTURE STREQUAL "riscv32")
set(LIBC_TARGET_ARCHITECTURE_IS_RISCV32 TRUE)
set(LIBC_TARGET_ARCHITECTURE "riscv")
else()
message(FATAL_ERROR
"Unsupported libc target architecture ${LIBC_TARGET_ARCHITECTURE}")
endif()
if(LIBC_TARGET_OS STREQUAL "baremetal")
set(LIBC_TARGET_OS_IS_BAREMETAL TRUE)
elseif(LIBC_TARGET_OS STREQUAL "linux")
set(LIBC_TARGET_OS_IS_LINUX TRUE)
elseif(LIBC_TARGET_OS STREQUAL "poky" OR LIBC_TARGET_OS STREQUAL "suse")
# poky are ustom Linux-base systems created by yocto. Since these are Linux
# images, we change the LIBC_TARGET_OS to linux. This define is used to
# include the right directories during compilation.
#
# openSUSE uses different triple format which causes LIBC_TARGET_OS to be
# computed as "suse" instead of "linux".
set(LIBC_TARGET_OS_IS_LINUX TRUE)
set(LIBC_TARGET_OS "linux")
elseif(LIBC_TARGET_OS STREQUAL "darwin")
set(LIBC_TARGET_OS_IS_DARWIN TRUE)
elseif(LIBC_TARGET_OS STREQUAL "windows")
set(LIBC_TARGET_OS_IS_WINDOWS TRUE)
else()
message(FATAL_ERROR
"Unsupported libc target operating system ${LIBC_TARGET_OS}")
endif()
# If the compiler target triple is not the same as the triple specified by
# LIBC_TARGET_TRIPLE or LLVM_RUNTIMES_TARGET, we will add a --target option
# if the compiler is clang. If the compiler is GCC we just error out as there
# is no equivalent of an option like --target.
if(explicit_target_triple AND
(NOT (libc_compiler_triple STREQUAL explicit_target_triple)))
set(LIBC_CROSSBUILD TRUE)
if(CMAKE_COMPILER_IS_GNUCXX)
message(FATAL_ERROR
"GCC target triple (${libc_compiler_triple}) and the explicity "
"specified target triple (${explicit_target_triple}) do not match.")
else()
list(APPEND
LIBC_COMPILE_OPTIONS_DEFAULT "--target=${explicit_target_triple}")
endif()
endif()
message(STATUS
"Building libc for ${LIBC_TARGET_ARCHITECTURE} on ${LIBC_TARGET_OS}")
|