Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
kbuild: uapi: also test UAPI headers against C++ compilers
C++ language requirements differ from those of C.
Also test the headers against C++ compilers to make sure no errors
creep in accidentally.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260316-kbuild-uapi-c-v2-5-35d6d0ed863f@weissschuh.net
Signed-off-by: Nicolas Schier <nsc@kernel.org>
authored by
Thomas Weißschuh
and committed by
Nicolas Schier
dcc99abe
b187c1a1
+28
+28
usr/include/Makefile
+28
usr/include/Makefile
···
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UAPI_ARCH := $(or $(HEADER_ARCH),$(SRCARCH))
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override c_flags = $(KBUILD_USERCFLAGS) $(UAPI_CFLAGS) -Wp,-MMD,$(depfile)
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cxx_flags = $(filter-out -Wmissing-prototypes -Wstrict-prototypes -std=%, $(KBUILD_USERCFLAGS)) -std=c++98
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# The following are excluded for now because they fail to build.
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#
···
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# asm-generic/*.h is used by asm/*.h, and should not be included directly
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no-header-test += asm-generic/%
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# The following are not compatible with C++.
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#
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# Do not add a new header to the list without legitimate reason.
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# Please consider to fix the header first.
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#
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# Sorted alphabetically.
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no-header-test-cxx += linux/auto_dev-ioctl.h
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no-header-test-cxx += linux/map_to_14segment.h
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no-header-test-cxx += linux/map_to_7segment.h
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no-header-test-cxx += linux/netfilter/xt_sctp.h
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no-header-test-cxx += linux/target_core_user.h
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no-header-test-cxx += linux/vhost.h
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no-header-test-cxx += linux/vhost_types.h
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no-header-test-cxx += linux/virtio_net.h
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no-header-test-cxx += linux/virtio_ring.h
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no-header-test-cxx += scsi/fc/fc_els.h
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ifeq ($(UAPI_ARCH),x86)
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no-header-test-cxx += asm/elf.h
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endif
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# The following are using libc header and types.
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#
···
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always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
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# $(cc-option) forces '-x c' which breaks '-x c++' detection.
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cc-can-compile-cxx := $(call try-run,$(CC) $(CLANG_FLAGS) -c -x c++ /dev/null -o "$$TMP", 1)
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target-libc = $(filter $(uses-libc), $*.h)
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target-can-compile = $(filter-out $(no-header-test), $*.h)
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target-can-compile-cxx = $(and $(cc-can-compile-cxx), $(target-can-compile), $(filter-out $(no-header-test-cxx), $*.h))
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hdrtest-flags = -fsyntax-only -Werror \
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-nostdinc -I $(obj) $(if $(target-libc), -I $(srctree)/usr/dummy-include)
···
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cmd_hdrtest = \
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$(CC) $(c_flags) $(hdrtest-flags) -x c /dev/null \
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$(if $(target-can-compile), -include $< -include $<); \
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$(if $(target-can-compile-cxx), \
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$(CC) $(cxx_flags) $(hdrtest-flags) -x c++ /dev/null -include $<;) \
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$(PERL) $(src)/headers_check.pl $(obj) $<; \
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touch $@
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