-
Notifications
You must be signed in to change notification settings - Fork 2.5k
/
CMakeDetermineCCompiler.cmake
149 lines (127 loc) · 6.01 KB
/
CMakeDetermineCCompiler.cmake
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
# determine the compiler to use for C programs
# NOTE, a generator may set CMAKE_C_COMPILER before
# loading this file to force a compiler.
# use environment variable CC first if defined by user, next use
# the cmake variable CMAKE_GENERATOR_CC which can be defined by a generator
# as a default compiler
# If the internal cmake variable _CMAKE_TOOLCHAIN_PREFIX is set, this is used
# as prefix for the tools (e.g. arm-elf-gcc, arm-elf-ar etc.). This works
# currently with the GNU crosscompilers.
#
# Sets the following variables:
# CMAKE_C_COMPILER
# CMAKE_AR
# CMAKE_RANLIB
# CMAKE_COMPILER_IS_GNUCC
#
# If not already set before, it also sets
# _CMAKE_TOOLCHAIN_PREFIX
IF(NOT CMAKE_C_COMPILER)
SET(CMAKE_CXX_COMPILER_INIT NOTFOUND)
# prefer the environment variable CC
IF($ENV{CC} MATCHES ".+")
GET_FILENAME_COMPONENT(CMAKE_C_COMPILER_INIT $ENV{CC} PROGRAM PROGRAM_ARGS CMAKE_C_FLAGS_ENV_INIT)
IF(CMAKE_C_FLAGS_ENV_INIT)
SET(CMAKE_C_COMPILER_ARG1 "${CMAKE_C_FLAGS_ENV_INIT}" CACHE STRING "First argument to C compiler")
ENDIF(CMAKE_C_FLAGS_ENV_INIT)
IF(NOT EXISTS ${CMAKE_C_COMPILER_INIT})
MESSAGE(FATAL_ERROR "Could not find compiler set in environment variable CC:\n$ENV{CC}.")
ENDIF(NOT EXISTS ${CMAKE_C_COMPILER_INIT})
ENDIF($ENV{CC} MATCHES ".+")
# next try prefer the compiler specified by the generator
IF(CMAKE_GENERATOR_CC)
IF(NOT CMAKE_C_COMPILER_INIT)
SET(CMAKE_C_COMPILER_INIT ${CMAKE_GENERATOR_CC})
ENDIF(NOT CMAKE_C_COMPILER_INIT)
ENDIF(CMAKE_GENERATOR_CC)
# finally list compilers to try
IF(CMAKE_C_COMPILER_INIT)
SET(CMAKE_C_COMPILER_LIST ${CMAKE_C_COMPILER_INIT})
ELSE(CMAKE_C_COMPILER_INIT)
SET(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}gcc ${_CMAKE_TOOLCHAIN_PREFIX}cc cl bcc xlc)
ENDIF(CMAKE_C_COMPILER_INIT)
# Find the compiler.
IF (_CMAKE_USER_CXX_COMPILER_PATH)
FIND_PROGRAM(CMAKE_C_COMPILER NAMES ${CMAKE_C_COMPILER_LIST} PATHS ${_CMAKE_USER_CXX_COMPILER_PATH} DOC "C compiler" NO_DEFAULT_PATH)
ENDIF (_CMAKE_USER_CXX_COMPILER_PATH)
FIND_PROGRAM(CMAKE_C_COMPILER NAMES ${CMAKE_C_COMPILER_LIST} DOC "C compiler")
IF(CMAKE_C_COMPILER_INIT AND NOT CMAKE_C_COMPILER)
SET(CMAKE_C_COMPILER "${CMAKE_C_COMPILER_INIT}" CACHE FILEPATH "C compiler" FORCE)
ENDIF(CMAKE_C_COMPILER_INIT AND NOT CMAKE_C_COMPILER)
ELSE(NOT CMAKE_C_COMPILER)
# we only get here if CMAKE_C_COMPILER was specified using -D or a pre-made CMakeCache.txt
# (e.g. via ctest) or set in CMAKE_TOOLCHAIN_FILE
# if CMAKE_C_COMPILER is a list of length 2, use the first item as
# CMAKE_C_COMPILER and the 2nd one as CMAKE_C_COMPILER_ARG1
LIST(LENGTH CMAKE_C_COMPILER _CMAKE_C_COMPILER_LIST_LENGTH)
IF("${_CMAKE_C_COMPILER_LIST_LENGTH}" EQUAL 2)
LIST(GET CMAKE_C_COMPILER 1 CMAKE_C_COMPILER_ARG1)
LIST(GET CMAKE_C_COMPILER 0 CMAKE_C_COMPILER)
ENDIF("${_CMAKE_C_COMPILER_LIST_LENGTH}" EQUAL 2)
# if a compiler was specified by the user but without path,
# now try to find it with the full path
# if it is found, force it into the cache,
# if not, don't overwrite the setting (which was given by the user) with "NOTFOUND"
# if the C compiler already had a path, reuse it for searching the CXX compiler
GET_FILENAME_COMPONENT(_CMAKE_USER_C_COMPILER_PATH "${CMAKE_C_COMPILER}" PATH)
IF(NOT _CMAKE_USER_C_COMPILER_PATH)
FIND_PROGRAM(CMAKE_C_COMPILER_WITH_PATH NAMES ${CMAKE_C_COMPILER})
MARK_AS_ADVANCED(CMAKE_C_COMPILER_WITH_PATH)
IF(CMAKE_C_COMPILER_WITH_PATH)
SET(CMAKE_C_COMPILER ${CMAKE_C_COMPILER_WITH_PATH} CACHE STRING "C compiler" FORCE)
ENDIF(CMAKE_C_COMPILER_WITH_PATH)
ENDIF(NOT _CMAKE_USER_C_COMPILER_PATH)
ENDIF(NOT CMAKE_C_COMPILER)
MARK_AS_ADVANCED(CMAKE_C_COMPILER)
IF (NOT _CMAKE_TOOLCHAIN_LOCATION)
GET_FILENAME_COMPONENT(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_C_COMPILER}" PATH)
ENDIF (NOT _CMAKE_TOOLCHAIN_LOCATION)
# if we have a gcc cross compiler, they have usually some prefix, like
# e.g. powerpc-linux-gcc, arm-elf-gcc or i586-mingw32msvc-gcc
# the other tools of the toolchain usually have the same prefix
IF (NOT _CMAKE_TOOLCHAIN_PREFIX)
GET_FILENAME_COMPONENT(COMPILER_BASENAME "${CMAKE_C_COMPILER}" NAME_WE)
IF (COMPILER_BASENAME MATCHES "^(.+-)g?cc")
STRING(REGEX REPLACE "^(.+-)g?cc" "\\1" _CMAKE_TOOLCHAIN_PREFIX "${COMPILER_BASENAME}")
ENDIF (COMPILER_BASENAME MATCHES "^(.+-)g?cc")
ENDIF (NOT _CMAKE_TOOLCHAIN_PREFIX)
# Build a small source file to identify the compiler.
IF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
SET(CMAKE_C_COMPILER_ID_RUN 1)
SET(CMAKE_C_PLATFORM_ID "Windows")
# TODO: Set the compiler id. It is probably MSVC but
# the user may be using an integrated Intel compiler.
# SET(CMAKE_C_COMPILER_ID "MSVC")
ENDIF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
IF(NOT CMAKE_C_COMPILER_ID_RUN)
SET(CMAKE_C_COMPILER_ID_RUN 1)
# Each entry in this list is a set of extra flags to try
# adding to the compile line to see if it helps produce
# a valid identification file.
SET(CMAKE_C_COMPILER_ID_TEST_FLAGS
# Try compiling to an object file only.
"-c"
)
# Try to identify the compiler.
SET(CMAKE_C_COMPILER_ID)
FILE(READ ${CMAKE_ROOT}/Modules/CMakePlatformId.h.in
CMAKE_C_COMPILER_ID_PLATFORM_CONTENT)
INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
CMAKE_DETERMINE_COMPILER_ID(C CFLAGS CMakeCCompilerId.c)
# Set old compiler and platform id variables.
IF("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
SET(CMAKE_COMPILER_IS_GNUCC 1)
ENDIF("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
IF("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
SET(CMAKE_COMPILER_IS_MINGW 1)
ELSEIF("${CMAKE_C_PLATFORM_ID}" MATCHES "Cygwin")
SET(CMAKE_COMPILER_IS_CYGWIN 1)
ENDIF("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")
ENDIF(NOT CMAKE_C_COMPILER_ID_RUN)
INCLUDE(CMakeFindBinUtils)
# configure variables set in this file for fast reload later on
CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
"${CMAKE_PLATFORM_ROOT_BIN}/CMakeCCompiler.cmake"
@ONLY IMMEDIATE # IMMEDIATE must be here for compatibility mode <= 2.0
)
SET(CMAKE_C_COMPILER_ENV_VAR "CC")