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| author | Thomas Weißschuh <linux@weissschuh.net> | 2026-03-16 17:52:02 +0100 |
|---|---|---|
| committer | Nicolas Schier <nsc@kernel.org> | 2026-03-25 13:24:42 +0100 |
| commit | dcc99abebfa1e9ca70f8af8695b6682ad7597bf2 (patch) | |
| tree | a3fddee07fa902d300eda310074c9d722c6524ee /usr/include | |
| parent | b187c1a1a0513593663b1adee0340d41d833d16d (diff) | |
| download | linux-dcc99abebfa1e9ca70f8af8695b6682ad7597bf2.tar.gz linux-dcc99abebfa1e9ca70f8af8695b6682ad7597bf2.zip | |
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>
Diffstat (limited to 'usr/include')
| -rw-r--r-- | usr/include/Makefile | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/usr/include/Makefile b/usr/include/Makefile index edeaf9d778c4..ee69dd9d970e 100644 --- a/usr/include/Makefile +++ b/usr/include/Makefile @@ -10,6 +10,7 @@ UAPI_CFLAGS := -std=c90 -Werror=implicit-function-declaration UAPI_ARCH := $(or $(HEADER_ARCH),$(SRCARCH)) override c_flags = $(KBUILD_USERCFLAGS) $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) +cxx_flags = $(filter-out -Wmissing-prototypes -Wstrict-prototypes -std=%, $(KBUILD_USERCFLAGS)) -std=c++98 # The following are excluded for now because they fail to build. # @@ -61,6 +62,27 @@ endif # asm-generic/*.h is used by asm/*.h, and should not be included directly no-header-test += asm-generic/% +# The following are not compatible with C++. +# +# Do not add a new header to the list without legitimate reason. +# Please consider to fix the header first. +# +# Sorted alphabetically. +no-header-test-cxx += linux/auto_dev-ioctl.h +no-header-test-cxx += linux/map_to_14segment.h +no-header-test-cxx += linux/map_to_7segment.h +no-header-test-cxx += linux/netfilter/xt_sctp.h +no-header-test-cxx += linux/target_core_user.h +no-header-test-cxx += linux/vhost.h +no-header-test-cxx += linux/vhost_types.h +no-header-test-cxx += linux/virtio_net.h +no-header-test-cxx += linux/virtio_ring.h +no-header-test-cxx += scsi/fc/fc_els.h + +ifeq ($(UAPI_ARCH),x86) +no-header-test-cxx += asm/elf.h +endif + # The following are using libc header and types. # # Do not add a new header to the list without legitimate reason. @@ -138,8 +160,12 @@ endif always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null)) +# $(cc-option) forces '-x c' which breaks '-x c++' detection. +cc-can-compile-cxx := $(call try-run,$(CC) $(CLANG_FLAGS) -c -x c++ /dev/null -o "$$TMP", 1) + target-libc = $(filter $(uses-libc), $*.h) target-can-compile = $(filter-out $(no-header-test), $*.h) +target-can-compile-cxx = $(and $(cc-can-compile-cxx), $(target-can-compile), $(filter-out $(no-header-test-cxx), $*.h)) hdrtest-flags = -fsyntax-only -Werror \ -nostdinc -I $(obj) $(if $(target-libc), -I $(srctree)/usr/dummy-include) @@ -149,6 +175,8 @@ quiet_cmd_hdrtest = HDRTEST $< cmd_hdrtest = \ $(CC) $(c_flags) $(hdrtest-flags) -x c /dev/null \ $(if $(target-can-compile), -include $< -include $<); \ + $(if $(target-can-compile-cxx), \ + $(CC) $(cxx_flags) $(hdrtest-flags) -x c++ /dev/null -include $<;) \ $(PERL) $(src)/headers_check.pl $(obj) $<; \ touch $@ |