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bpfilter: check if $(CC) can link static libc in Kconfig
On Fedora, linking static glibc requires the glibc-static RPM package, which is not part of the glibc-devel package. CONFIG_CC_CAN_LINK does not check the capability of static linking, so you can enable CONFIG_BPFILTER_UMH, then fail to build: HOSTLD net/bpfilter/bpfilter_umh /usr/bin/ld: cannot find -lc collect2: error: ld returned 1 exit status Add CONFIG_CC_CAN_LINK_STATIC, and make CONFIG_BPFILTER_UMH depend on it. Reported-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Alexei Starovoitov <ast@kernel.org>
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@ -49,6 +49,11 @@ config CC_CAN_LINK
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default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(m64-flag)) if 64BIT
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default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(m32-flag))
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config CC_CAN_LINK_STATIC
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bool
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default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) -static $(m64-flag)) if 64BIT
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default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) -static $(m32-flag))
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config CC_HAS_ASM_GOTO
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def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
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@ -9,7 +9,7 @@ menuconfig BPFILTER
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if BPFILTER
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config BPFILTER_UMH
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tristate "bpfilter kernel module with user mode helper"
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depends on CC_CAN_LINK
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depends on CC_CAN_LINK_STATIC
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default m
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help
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This builds bpfilter kernel module with embedded user mode helper
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