Re: [Qemu-devel] [PATCH v7 01/24] build: Link user-only with crypto-rng-obj-y

["Daniel P. Berrangé" <berrange@redhat.com>]

On Tue, May 14, 2019 at 12:16:30PM -0700, Richard Henderson wrote:
> For user-only, we require only the random number bits of the
> crypto subsystem.
> 
> We need to preserve --static linking, which for many recent Linux
> distributions precludes using GnuTLS or GCrypt.  Instead, use our
> random-platform module unconditionally.

I don't think we need to special case in this way.

Today if you do a default build with all targets & tools and want
to use --static, but don't have static libs available for some
things you can achieve that

 ./configure --static --disable-gnutls --disable-gcrypt --disable-nettle

Previously if you took care to disable system emulators & tools
you could avoid the need to pass the --disable-* args, but I
think that's fairly minor.

So I think we should just use $(crypto-obj-y) unconditionally in
the user emulators, and get rid of crypto-aes-obj-y too.

This will give a consistent crypto story across all the things we
build with no special cases.

If people want a minimal static build they can stsill pass the
above --disable-XXX args which will result in them only using
the aes.o and rng-platform.o pieces.

> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  Makefile             | 6 ++++--
>  Makefile.objs        | 1 +
>  Makefile.target      | 3 ++-
>  crypto/Makefile.objs | 1 +
>  4 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 66d5c65156..524f2f8a57 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -411,6 +411,7 @@ dummy := $(call unnest-vars,, \
>                  block-obj-m \
>                  crypto-obj-y \
>                  crypto-aes-obj-y \
> +                crypto-rng-obj-y \
>                  qom-obj-y \
>                  io-obj-y \
>                  common-obj-y \
> @@ -482,8 +483,9 @@ subdir-capstone: .git-submodule-status
>  subdir-slirp: .git-submodule-status
>  	$(call quiet-command,$(MAKE) -C $(SRC_PATH)/slirp BUILD_DIR="$(BUILD_DIR)/slirp" CC="$(CC)" AR="$(AR)" LD="$(LD)" RANLIB="$(RANLIB)" CFLAGS="$(QEMU_CFLAGS) $(CFLAGS)" LDFLAGS="$(LDFLAGS)")
>  
> -$(SUBDIR_RULES): libqemuutil.a $(common-obj-y) $(chardev-obj-y) \
> -	$(qom-obj-y) $(crypto-aes-obj-$(CONFIG_USER_ONLY))
> +$(SUBDIR_RULES): libqemuutil.a $(common-obj-y) $(chardev-obj-y) $(qom-obj-y) \
> +	$(crypto-aes-obj-$(CONFIG_USER_ONLY)) \
> +	$(crypto-rng-obj-$(CONFIG_USER_ONLY))
>  
>  ROMSUBDIR_RULES=$(patsubst %,romsubdir-%, $(ROMS))
>  # Only keep -O and -g cflags
> diff --git a/Makefile.objs b/Makefile.objs
> index cf065de5ed..0c13ff47ea 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -26,6 +26,7 @@ block-obj-m = block/
>  
>  crypto-obj-y = crypto/
>  crypto-aes-obj-y = crypto/
> +crypto-rng-obj-y = crypto/
>  
>  #######################################################################
>  # qom-obj-y is code used by both qemu system emulation and qemu-img
> diff --git a/Makefile.target b/Makefile.target
> index ae02495951..4e579a0a84 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -181,6 +181,7 @@ dummy := $(call unnest-vars,.., \
>                 chardev-obj-y \
>                 crypto-obj-y \
>                 crypto-aes-obj-y \
> +               crypto-rng-obj-y \
>                 qom-obj-y \
>                 io-obj-y \
>                 common-obj-y \
> @@ -189,7 +190,7 @@ all-obj-y += $(common-obj-y)
>  all-obj-y += $(qom-obj-y)
>  all-obj-$(CONFIG_SOFTMMU) += $(authz-obj-y)
>  all-obj-$(CONFIG_SOFTMMU) += $(block-obj-y) $(chardev-obj-y)
> -all-obj-$(CONFIG_USER_ONLY) += $(crypto-aes-obj-y)
> +all-obj-$(CONFIG_USER_ONLY) += $(crypto-aes-obj-y) $(crypto-rng-obj-y)
>  all-obj-$(CONFIG_SOFTMMU) += $(crypto-obj-y)
>  all-obj-$(CONFIG_SOFTMMU) += $(io-obj-y)
>  
> diff --git a/crypto/Makefile.objs b/crypto/Makefile.objs
> index 256c9aca1f..ee7e628ca6 100644
> --- a/crypto/Makefile.objs
> +++ b/crypto/Makefile.objs
> @@ -37,5 +37,6 @@ crypto-obj-y += block-luks.o
>  
>  # Let the userspace emulators avoid linking gnutls/etc
>  crypto-aes-obj-y = aes.o
> +crypto-rng-obj-y = random-platform.o
>  
>  stub-obj-y += pbkdf-stub.o
> -- 
> 2.17.1
> 
> 

Regards,
Daniel
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