1 #!/bin/sh 1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0-only 2 # SPDX-License-Identifier: GPL-2.0-only
3 # 3 #
4 # Staring v4.18, Kconfig evaluates compiler ca 4 # Staring v4.18, Kconfig evaluates compiler capabilities, and hides CONFIG
5 # options your compiler does not support. This 5 # options your compiler does not support. This works well if you configure and
6 # build the kernel on the same host machine. 6 # build the kernel on the same host machine.
7 # 7 #
8 # It is inconvenient if you prepare the .confi 8 # It is inconvenient if you prepare the .config that is carried to a different
9 # build environment (typically this happens wh 9 # build environment (typically this happens when you package the kernel for
10 # distros) because using a different compiler 10 # distros) because using a different compiler potentially produces different
11 # CONFIG options than the real build environme 11 # CONFIG options than the real build environment. So, you probably want to make
12 # as many options visible as possible. In othe 12 # as many options visible as possible. In other words, you need to create a
13 # super-set of CONFIG options that cover any b 13 # super-set of CONFIG options that cover any build environment. If some of the
14 # CONFIG options turned out to be unsupported 14 # CONFIG options turned out to be unsupported on the build machine, they are
15 # automatically disabled by the nature of Kcon 15 # automatically disabled by the nature of Kconfig.
16 # 16 #
17 # However, it is not feasible to get a full-fe 17 # However, it is not feasible to get a full-featured compiler for every arch.
18 # Hence these dummy toolchains to make all com 18 # Hence these dummy toolchains to make all compiler tests pass.
19 # 19 #
20 # Usage: 20 # Usage:
21 # 21 #
22 # From the top directory of the source tree, r 22 # From the top directory of the source tree, run
23 # 23 #
24 # $ make CROSS_COMPILE=scripts/dummy-tools/ 24 # $ make CROSS_COMPILE=scripts/dummy-tools/ oldconfig
25 # 25 #
26 # Most of compiler features are tested by cc-o 26 # Most of compiler features are tested by cc-option, which simply checks the
27 # exit code of $(CC). This script does nothing 27 # exit code of $(CC). This script does nothing and just exits with 0 in most
28 # cases. So, $(cc-option, ...) is evaluated as 28 # cases. So, $(cc-option, ...) is evaluated as 'y'.
29 # 29 #
30 # This scripts caters to more checks; handle - 30 # This scripts caters to more checks; handle --version and pre-process __GNUC__
31 # etc. to pretend to be GCC, and also do right 31 # etc. to pretend to be GCC, and also do right things to satisfy some scripts.
32 32
33 # Check if the first parameter appears in the 33 # Check if the first parameter appears in the rest. Succeeds if found.
34 # This helper is useful if a particular option 34 # This helper is useful if a particular option was passed to this script.
35 # Typically used like this: 35 # Typically used like this:
36 # arg_contain <word-you-are-searching-for> " 36 # arg_contain <word-you-are-searching-for> "$@"
37 arg_contain () 37 arg_contain ()
38 { 38 {
39 search="$1" 39 search="$1"
40 shift 40 shift
41 41
42 while [ $# -gt 0 ] 42 while [ $# -gt 0 ]
43 do 43 do
44 if [ "$search" = "$1" ]; then 44 if [ "$search" = "$1" ]; then
45 return 0 45 return 0
46 fi 46 fi
47 shift 47 shift
48 done 48 done
49 49
50 return 1 50 return 1
51 } 51 }
52 52
53 # To set CONFIG_CC_IS_GCC=y 53 # To set CONFIG_CC_IS_GCC=y
54 if arg_contain --version "$@"; then 54 if arg_contain --version "$@"; then
55 echo "gcc (scripts/dummy-tools/gcc)" 55 echo "gcc (scripts/dummy-tools/gcc)"
56 exit 0 56 exit 0
57 fi 57 fi
58 58
59 if arg_contain -E "$@"; then 59 if arg_contain -E "$@"; then
60 # For scripts/cc-version.sh; This emul 60 # For scripts/cc-version.sh; This emulates GCC 20.0.0
61 if arg_contain - "$@"; then 61 if arg_contain - "$@"; then
62 sed -n '/^GCC/{s/__GNUC__/20/; !! 62 sed -n '/^GCC/{s/__GNUC__/20/; s/__GNUC_MINOR__/0/; s/__GNUC_PATCHLEVEL__/0/; p;}'
63 exit 0 63 exit 0
64 else 64 else
65 echo "no input files" >&2 65 echo "no input files" >&2
66 exit 1 66 exit 1
67 fi 67 fi
68 fi 68 fi
69 69
70 # To set CONFIG_AS_IS_GNU 70 # To set CONFIG_AS_IS_GNU
71 if arg_contain -Wa,--version "$@"; then 71 if arg_contain -Wa,--version "$@"; then
72 echo "GNU assembler (scripts/dummy-too 72 echo "GNU assembler (scripts/dummy-tools) 2.50"
73 exit 0 73 exit 0
74 fi 74 fi
75 75
76 if arg_contain -S "$@"; then 76 if arg_contain -S "$@"; then
77 # For scripts/gcc-x86-*-has-stack-prot 77 # For scripts/gcc-x86-*-has-stack-protector.sh
78 if arg_contain -fstack-protector "$@"; 78 if arg_contain -fstack-protector "$@"; then
79 if arg_contain -mstack-protect 79 if arg_contain -mstack-protector-guard-reg=fs "$@"; then
80 echo "%fs" 80 echo "%fs"
81 else 81 else
82 echo "%gs" 82 echo "%gs"
83 fi 83 fi
84 exit 0 84 exit 0
85 fi 85 fi
86 86
87 # For arch/powerpc/tools/gcc-check-mpr 87 # For arch/powerpc/tools/gcc-check-mprofile-kernel.sh
88 if arg_contain -m64 "$@" && arg_contai !! 88 if arg_contain -m64 "$@" && arg_contain -mlittle-endian "$@" &&
>> 89 arg_contain -mprofile-kernel "$@"; then
89 if ! test -t 0 && ! grep -q no 90 if ! test -t 0 && ! grep -q notrace; then
90 echo "_mcount" 91 echo "_mcount"
91 fi 92 fi
92 exit 0 <<
93 fi <<
94 <<
95 # For arch/powerpc/tools/gcc-check-fpa <<
96 if arg_contain -m64 "$@" && arg_contai <<
97 echo "func:" <<
98 echo ".section __patchable_fun <<
99 echo ".localentry" <<
100 echo " nop" <<
101 echo " nop" <<
102 exit 0 93 exit 0
103 fi 94 fi
104 fi 95 fi
105 96
106 # To set GCC_PLUGINS 97 # To set GCC_PLUGINS
107 if arg_contain -print-file-name=plugin "$@"; t 98 if arg_contain -print-file-name=plugin "$@"; then
108 # Use $0 to find the in-tree dummy dir 99 # Use $0 to find the in-tree dummy directory
109 echo "$(dirname "$(readlink -f "$0")") 100 echo "$(dirname "$(readlink -f "$0")")/dummy-plugin-dir"
110 exit 0 101 exit 0
111 fi 102 fi
112 103
113 # inverted return value 104 # inverted return value
114 if arg_contain -D__SIZEOF_INT128__=0 "$@"; the 105 if arg_contain -D__SIZEOF_INT128__=0 "$@"; then
115 exit 1 106 exit 1
116 fi 107 fi
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