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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
#
# This file implements the support for external toolchains, i.e
# toolchains that have not been produced by Buildroot itself and that
# are already available on the system on which Buildroot runs.
#
# The basic principle is the following
#
# 1. Perform some checks on the conformity between the toolchain
# configuration described in the Buildroot menuconfig system, and the
# real configuration of the external toolchain. This is for example
# important to make sure that the Buildroot configuration system
# knows whether the toolchain supports RPC, IPv6, locales, large
# files, etc. Unfortunately, these things cannot be detected
# automatically, since the value of these options (such as
# BR2_INET_RPC) are needed at configuration time because these
# options are used as dependencies for other options. And at
# configuration time, we are not able to retrieve the external
# toolchain configuration.
#
# 2. Copy the libraries needed at runtime to the target directory,
# $(TARGET_DIR). Obviously, things such as the C library, the dynamic
# loader and a few other utility libraries are needed if dynamic
# applications are to be executed on the target system.
#
# 3. Copy the libraries and headers to the staging directory. This
# will allow all further calls to gcc to be made using --sysroot
# $(STAGING_DIR), which greatly simplifies the compilation of the
# packages when using external toolchains. So in the end, only the
# cross-compiler binaries remains external, all libraries and headers
# are imported into the Buildroot tree.
#
# Copy a toolchain library and its symbolic links from the sysroot
# directory to the target directory. Also optionaly strips the
# library.
#
# $1: sysroot directory
# $2: library name
# $3: destination directory
# $4: strip (y|n), default is to strip
#
copy_toolchain_lib_root = \
SYSROOT_DIR="$(strip $1)"; \
LIB="$(strip $2)"; \
DST="$(strip $3)"; \
STRIP="$(strip $4)"; \
\
LIB_DIR="$${SYSROOT_DIR}/lib" ; \
for FILE in `find $${LIB_DIR} -maxdepth 1 -name "$${LIB}.*"`; do \
LIB=`basename $${FILE}`; \
while test \! -z "$${LIB}"; do \
rm -fr $(TARGET_DIR)$${DST}/$${LIB}; \
mkdir -p $(TARGET_DIR)$${DST}; \
if test -h $${LIB_DIR}/$${LIB}; then \
cp -d $${LIB_DIR}/$${LIB} $(TARGET_DIR)$${DST}/; \
elif test -f $${LIB_DIR}/$${LIB}; then \
$(INSTALL) -D -m0755 $${LIB_DIR}/$${LIB} $(TARGET_DIR)$${DST}/$${LIB}; \
case "$${STRIP}" in \
(0 | n | no) \
;; \
(*) \
$(TARGET_CROSS)strip "$(TARGET_DIR)$${DST}/$${LIB}"; \
;; \
esac; \
else \
exit -1; \
fi; \
LIB="`readlink $${LIB_DIR}/$${LIB}`"; \
done; \
done; \
\
echo -n
#
# Copy the full external toolchain sysroot directory to the staging
# dir
#
# $1: sysroot directory
#
copy_toolchain_sysroot = \
SYSROOT_DIR="$(strip $1)"; \
cp -a $${SYSROOT_DIR}/* $(STAGING_DIR)/ ; \
find $(STAGING_DIR) -type d | xargs chmod 755
#
# Check the availability of a particular glibc feature. We assume that
# all Buildroot toolchain options are supported by glibc, so we just
# check that they are enabled.
#
# $1: Buildroot option name
# $2: feature description
#
check_glibc_feature = \
if [ x$($(1)) != x"y" ] ; then \
echo "$(2) available in C library, please enable $(1)" ; \
exit 1 ; \
fi
#
# Check the correctness of a glibc external toolchain configuration.
# 1. Check that the C library selected in Buildroot matches the one
# of the external toolchain
# 2. Check that all the C library-related features are enabled in the
# config, since glibc always supports all of them
#
# $1: sysroot directory
#
check_glibc = \
SYSROOT_DIR="$(strip $1)"; \
if ! test -f $${SYSROOT_DIR}/lib/ld-linux.so.* ; then \
echo "Incorrect selection of the C library"; \
exit -1; \
fi; \
$(call check_glibc_feature,BR2_LARGEFILE,Large file support) ;\
$(call check_glibc_feature,BR2_INET_IPV6,IPv6 support) ;\
$(call check_glibc_feature,BR2_INET_RPC,RPC support) ;\
$(call check_glibc_feature,BR2_ENABLE_LOCALE,Locale support) ;\
$(call check_glibc_feature,BR2_USE_WCHAR,Wide char support) ;\
$(call check_glibc_feature,BR2_PROGRAM_INVOCATION,Program invocation support)
#
# Check the conformity of Buildroot configuration with regard to the
# uClibc configuration of the external toolchain, for a particular
# feature.
#
# $1: uClibc macro name
# $2: Buildroot option name
# $3: uClibc config file
# $4: feature description
#
check_uclibc_feature = \
IS_IN_LIBC=`grep -q "\#define $(1) 1" $(3) && echo y` ; \
if [ x$($(2)) != x"y" -a x$${IS_IN_LIBC} == x"y" ] ; then \
echo "$(4) available in C library, please enable $(2)" ; \
exit 1 ; \
fi ; \
if [ x$($(2)) == x"y" -a x$${IS_IN_LIBC} != x"y" ] ; then \
echo "$(4) not available in C library, please disable $(2)" ; \
exit 1 ; \
fi
#
# Check the correctness of a uclibc external toolchain configuration
# 1. Check that the C library selected in Buildroot matches the one
# of the external toolchain
# 2. Check that the features enabled in the Buildroot configuration
# match the features available in the uClibc of the external
# toolchain
#
# $1: sysroot directory
#
check_uclibc = \
SYSROOT_DIR="$(strip $1)"; \
if ! test -f $${SYSROOT_DIR}/lib/ld-uClibc.so.* ; then \
echo "Incorrect selection of the C library"; \
exit -1; \
fi; \
UCLIBC_CONFIG_FILE=$${SYSROOT_DIR}/usr/include/bits/uClibc_config.h ; \
$(call check_uclibc_feature,__UCLIBC_HAS_LFS__,BR2_LARGEFILE,$${UCLIBC_CONFIG_FILE},Large file support) ;\
$(call check_uclibc_feature,__UCLIBC_HAS_IPV6__,BR2_INET_IPV6,$${UCLIBC_CONFIG_FILE},IPv6 support) ;\
$(call check_uclibc_feature,__UCLIBC_HAS_RPC__,BR2_INET_RPC,$${UCLIBC_CONFIG_FILE},RPC support) ;\
$(call check_uclibc_feature,__UCLIBC_HAS_LOCALE__,BR2_ENABLE_LOCALE,$${UCLIBC_CONFIG_FILE},Locale support) ;\
$(call check_uclibc_feature,__UCLIBC_HAS_WCHAR__,BR2_USE_WCHAR,$${UCLIBC_CONFIG_FILE},Wide char support) ;\
$(call check_uclibc_feature,__UCLIBC_HAS_PROGRAM_INVOCATION_NAME__,BR2_PROGRAM_INVOCATION,$${UCLIBC_CONFIG_FILE},Program invocation support) ;\
#
# Check that the Buildroot configuration of the ABI matches the
# configuration of the external toolchain.
#
check_arm_abi = \
EXT_TOOLCHAIN_TARGET=$(shell LANG=C $(TARGET_CC) -v 2>&1 | grep ^Target | cut -f2 -d ' ') ; \
if echo $${EXT_TOOLCHAIN_TARGET} | grep -q 'eabi$$' ; then \
EXT_TOOLCHAIN_ABI="eabi" ; \
else \
EXT_TOOLCHAIN_ABI="oabi" ; \
fi ; \
if [ x$(BR2_ARM_OABI) == x"y" -a $${EXT_TOOLCHAIN_ABI} == "eabi" ] ; then \
echo "Incorrect ABI setting" ; \
exit 1 ; \
fi ; \
if [ x$(BR2_ARM_EABI) == x"y" -a $${EXT_TOOLCHAIN_ABI} == "oabi" ] ; then \
echo "Incorrect ABI setting" ; \
exit 1 ; \
fi ; \
#
# Check that the cross-compiler given in the configuration exists
#
check_cross_compiler_exists = \
if ! test -x $(TARGET_CC) ; then \
echo "Cannot find cross-compiler $(TARGET_CC)" ; \
exit 1 ; \
fi ; \
uclibc: dependencies $(STAMP_DIR)/ext-toolchain-installed
EXTERNAL_LIBS=libc.so libcrypt.so libdl.so libgcc_s.so libm.so libnsl.so libpthread.so libresolv.so librt.so libutil.so
ifeq ($(BR2_TOOLCHAIN_EXTERNAL_UCLIBC),y)
EXTERNAL_LIBS+=ld-uClibc.so
else
EXTERNAL_LIBS+=ld-linux.so libnss_files.so libnss_dns.so
endif
ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
EXTERNAL_LIBS+=libstdc++.so
endif
SYSROOT_DIR=$(shell readlink -f $$(LANG=C $(TARGET_CC) -print-file-name=libc.a |sed -r -e 's:usr/lib/libc\.a::;'))
$(STAMP_DIR)/ext-toolchain-installed:
@echo "Checking external toolchain settings"
$(Q)$(call check_cross_compiler_exists)
ifeq ($(strip $(SYSROOT_DIR)),)
@echo "External toolchain doesn't support --sysroot. Cannot use."
exit 1
endif
ifeq ($(BR2_arm),y)
$(Q)$(call check_arm_abi)
endif
ifeq ($(BR2_TOOLCHAIN_EXTERNAL_UCLIBC),y)
$(Q)$(call check_uclibc,$(SYSROOT_DIR))
else
$(Q)$(call check_glibc,$(SYSROOT_DIR))
endif
mkdir -p $(TARGET_DIR)/lib
@echo "Copy external toolchain libraries to target..."
$(Q)for libs in $(EXTERNAL_LIBS); do \
$(call copy_toolchain_lib_root,$(SYSROOT_DIR),$$libs,/lib,$(BR2_TOOLCHAIN_EXTERNAL_STRIP)); \
done
@echo "Copy external toolchain sysroot to staging..."
$(Q)$(call copy_toolchain_sysroot,$(SYSROOT_DIR))
@touch $@
|
