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arc: Make sure that libgcc doesn't get included when it doesn't exist yet

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For ARC, libgcc is always included, even when -nostdlib is given. This is
related to some small pieces of code that are not always generated by the
compiler; a call to libgcc is used in those cases instead.

During the initial stages of building the toolchain, this is a problem, as
libgcc does not exist yet. The ARC compiler supports -really-nostdlib to
override the default behavior.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Mischa Jonker 2013-05-02 09:51:29 +00:00 committed by Peter Korsgaard
parent 5de23bf875
commit a6e6bf3ef6
1 changed files with 13 additions and 2 deletions
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15
toolchain/uClibc/uclibc.mk
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@ -404,6 +404,17 @@ ifeq ($(BR2_CCACHE),y)
$(UCLIBC_DIR)/.config: | host-ccache
endif
# For ARC, libgcc is always included, even when -nostdlib is given. This
# is related to some small pieces of code that are not always generated
# by the compiler; a call to libgcc is used in those cases instead.
#
# During the initial stages of building the toolchain, this is a problem,
# as libgcc does not exist yet. The ARC compiler supports -really-nostdlib
# to override the default behavior.
ifeq ($(BR2_arc),y)
REALLY_NOSTDLIB=-really-nostdlib
endif
$(UCLIBC_DIR)/.configured: $(LINUX_HEADERS_DIR)/.configured $(UCLIBC_DIR)/.config
$(Q)$(call MESSAGE,"Installing uClibc headers")
$(MAKE1) -C $(UCLIBC_DIR) \
@ -422,8 +433,8 @@ $(UCLIBC_DIR)/.configured: $(LINUX_HEADERS_DIR)/.configured $(UCLIBC_DIR)/.confi
cp -pLR $(LINUX_HEADERS_DIR)/include/* \
$(TOOLCHAIN_DIR)/uClibc_dev/usr/include/; \
fi
$(TARGET_CROSS)gcc -nostdlib -nostartfiles -shared -x c /dev/null -o $(TOOLCHAIN_DIR)/uClibc_dev/usr/lib/libc.so
$(TARGET_CROSS)gcc -nostdlib -nostartfiles -shared -x c /dev/null -o $(TOOLCHAIN_DIR)/uClibc_dev/usr/lib/libm.so
$(TARGET_CROSS)gcc -nostdlib $(REALLY_NOSTDLIB) -nostartfiles -shared -x c /dev/null -o $(TOOLCHAIN_DIR)/uClibc_dev/usr/lib/libc.so
$(TARGET_CROSS)gcc -nostdlib $(REALLY_NOSTDLIB) -nostartfiles -shared -x c /dev/null -o $(TOOLCHAIN_DIR)/uClibc_dev/usr/lib/libm.so
cp -pLR $(UCLIBC_DIR)/lib/crt[1in].o $(TOOLCHAIN_DIR)/uClibc_dev/usr/lib/
touch $@