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Re: [PATCH 1/2] Use -isystem for linux-headers dir
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH 1/2] Use -isystem for linux-headers dir |
Date: |
Wed, 11 Mar 2020 19:05:45 -0400 |
On Wed, Mar 11, 2020 at 06:51:29PM -0400, Eduardo Habkost wrote:
> glibc and Linux-provided headers are known to generate macro
> redefinition warnings when used together. For example:
> <linux/mman.h> and <sys/mman.h> duplicate some macro definitions.
>
> We normally never see those warnings because GCC suppresses
> warnings generated by system headers. We carry our own copy of
> Linux header files, though, and this makes those warnings not be
> suppressed when glibc headers are included before Linux headers
> (e.g. if <sys/mman.h> is included before <linux/mman.h>).
>
> Use -isystem instead of -I for linux-headers. This makes the
> compiler treat our linux-headers directory the same way it treats
> system-provided Linux headers, and suppress warnings generated by
> them.
>
> Signed-off-by: Eduardo Habkost <address@hidden>
> ---
> Makefile.target | 2 +-
> configure | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Makefile.target b/Makefile.target
> index 2d43dc586a..934a9f7431 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -12,7 +12,7 @@ endif
>
> $(call set-vpath, $(SRC_PATH):$(BUILD_DIR))
> ifdef CONFIG_LINUX
> -QEMU_CFLAGS += -I../linux-headers
> +QEMU_CFLAGS += -isystem ../linux-headers
> endif
> QEMU_CFLAGS += -iquote .. -iquote $(SRC_PATH)/target/$(TARGET_BASE_ARCH)
> -DNEED_CPU_H
>
> diff --git a/configure b/configure
> index cbf864bff1..04a2a7f2dd 100755
> --- a/configure
> +++ b/configure
> @@ -899,7 +899,7 @@ Linux)
> linux="yes"
> linux_user="yes"
> kvm="yes"
> - QEMU_INCLUDES="-I\$(SRC_PATH)/linux-headers -I$PWD/linux-headers
> $QEMU_INCLUDES"
> + QEMU_INCLUDES="-isystem \$(SRC_PATH)/linux-headers -I$PWD/linux-headers
> $QEMU_INCLUDES"
Shouldn't both be -isystem?
> supported_os="yes"
> libudev="yes"
> ;;
> --
> 2.24.1