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toolchain-external: add support for musl C library

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This commit adds support for external toolchains based on the musl C
library, as available from http://www.musl-libc.org.

Note that the pre-built musl toolchains available from
http://musl.codu.org/ are not working for the moment, since they lack
sysroot support. However, this problem has been reported to the
maintainer, who has already added sysroot support in his scripts at
https://bitbucket.org/GregorR/musl-cross, and therefore the next
version of the pre-built toolchains should work with Buildroot
out-of-the-box. In the mean time, the musl-cross script must be used
to build the toolchain.

[Peter: reword comment]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2013-10-08 20:17:09 +02:00 committed by Peter Korsgaard
parent 8e05ebca22
commit a1d94aaa3a
4 changed files with 49 additions and 1 deletions
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9
toolchain/Config.in
View File

@ -15,6 +15,15 @@ config BR2_TOOLCHAIN_USES_GLIBC
config BR2_TOOLCHAIN_USES_UCLIBC
bool
config BR2_TOOLCHAIN_USES_MUSL
bool
select BR2_LARGEFILE
select BR2_INET_IPV6
select BR2_USE_WCHAR
select BR2_ENABLE_LOCALE
select BR2_TOOLCHAIN_HAS_THREADS
select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
choice
prompt "Toolchain type"
help

11
toolchain/helpers.mk
View File

@ -208,6 +208,17 @@ check_glibc = \
$(call check_glibc_feature,BR2_USE_MMU,MMU support) ;\
$(call check_glibc_rpc_feature,$${SYSROOT_DIR})
#
# Check that the selected C library really is musl
#
# $1: sysroot directory
check_musl = \
SYSROOT_DIR="$(strip $1)"; \
if test ! -f $${SYSROOT_DIR}/lib/libc.so -o -e $${SYSROOT_DIR}/lib/libm.so ; then \
echo "Incorrect selection of the C library" ; \
exit -1; \
fi
#
# Check the conformity of Buildroot configuration with regard to the
# uClibc configuration of the external toolchain, for a particular

12
toolchain/toolchain-external/Config.in
View File

@ -860,6 +860,10 @@ config BR2_TOOLCHAIN_EXTERNAL_UCLIBC
bool
select BR2_TOOLCHAIN_USES_UCLIBC
config BR2_TOOLCHAIN_EXTERNAL_MUSL
bool
select BR2_TOOLCHAIN_USES_MUSL
if BR2_TOOLCHAIN_EXTERNAL_CUSTOM
choice
@ -882,6 +886,13 @@ config BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC
eglibc configured to exclude key features may cause build failures to
some packages.
config BR2_TOOLCHAIN_EXTERNAL_CUSTOM_MUSL
bool "musl"
select BR2_TOOLCHAIN_EXTERNAL_MUSL
help
Select this option if your external toolchain uses the
'musl' C library, available from http://www.musl-libc.org/.
endchoice
if BR2_TOOLCHAIN_EXTERNAL_CUSTOM_UCLIBC
@ -952,6 +963,7 @@ endif # BR2_TOOLCHAIN_EXTERNAL_CUSTOM_UCLIBC
config BR2_TOOLCHAIN_EXTERNAL_INET_RPC
bool "Toolchain has RPC support?"
select BR2_TOOLCHAIN_HAS_NATIVE_RPC
depends on !BR2_TOOLCHAIN_EXTERNAL_MUSL
default y if BR2_TOOLCHAIN_EXTERNAL_GLIBC
help
Select this option if your external toolchain supports

18
toolchain/toolchain-external/toolchain-external.mk
View File

@ -68,6 +68,10 @@ ifeq ($(BR2_TOOLCHAIN_EXTERNAL_GLIBC),y)
LIB_EXTERNAL_LIBS+=libnss_files.so.* libnss_dns.so.*
endif
ifeq ($(BR2_TOOLCHAIN_EXTERNAL_MUSL),y)
LIB_EXTERNAL_LIBS += libc.so libgcc_s.so.*
endif
ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
USR_LIB_EXTERNAL_LIBS+=libstdc++.so.*
endif
@ -353,7 +357,7 @@ endif
define TOOLCHAIN_EXTERNAL_CONFIGURE_CMDS
$(Q)$(call check_cross_compiler_exists,$(TOOLCHAIN_EXTERNAL_CC))
$(Q)LIBC_A_LOCATION=`readlink -f $$(LANG=C $(TOOLCHAIN_EXTERNAL_CC) -print-file-name=libc.a)` ; \
SYSROOT_DIR=`echo $${LIBC_A_LOCATION} | sed -r -e 's:usr/lib(32|64)?/(.*/)?libc\.a::'` ; \
SYSROOT_DIR=`echo $${LIBC_A_LOCATION} | sed -r -e 's:(usr/)?lib(32|64)?/(.*/)?libc\.a::'` ; \
if test -z "$${SYSROOT_DIR}" ; then \
@echo "External toolchain doesn't support --sysroot. Cannot use." ; \
exit 1 ; \
@ -368,11 +372,23 @@ define TOOLCHAIN_EXTERNAL_CONFIGURE_CMDS
fi ; \
if test "$(BR2_TOOLCHAIN_EXTERNAL_UCLIBC)" = "y" ; then \
$(call check_uclibc,$${SYSROOT_DIR}) ; \
elif test "$(BR2_TOOLCHAIN_EXTERNAL_MUSL)" = "y" ; then \
$(call check_musl,$${SYSROOT_DIR}) ; \
else \
$(call check_glibc,$${SYSROOT_DIR}) ; \
fi
endef
# With the musl C library, the libc.so library directly plays the role
# of the dynamic library loader. We just need to create a symbolic
# link to libc.so with the appropriate name.
ifeq ($(BR2_TOOLCHAIN_EXTERNAL_MUSL),y)
define TOOLCHAIN_EXTERNAL_MUSL_LD_LINK
ln -sf libc.so $(TARGET_DIR)/lib/ld-musl-$(ARCH).so.1
endef
TOOLCHAIN_EXTERNAL_POST_INSTALL_STAGING_HOOKS += TOOLCHAIN_EXTERNAL_MUSL_LD_LINK
endif
# Integration of the toolchain into Buildroot: find the main sysroot
# and the variant-specific sysroot, then copy the needed libraries to
# the $(TARGET_DIR) and copy the whole sysroot (libraries and headers)