Re: [Qemu-devel] [PATCH] configure: Add pkg-config handling for libgcrypt

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

On Thu, Aug 29, 2019 at 04:53:02PM +0800, zhe.he@windriver.com wrote:
> From: He Zhe <zhe.he@windriver.com>
> 
> libgcrypt may also be controlled by pkg-config, this patch adds pkg-config
> handling for libgcrypt.

Where are you seeing pkg-config files for libgcrypt ?

The upstream project has (frustratingly) been hostile to any proposal to
add pkg-config support saying people should stick with their custom 
libgcrypt-config tool

   https://dev.gnupg.org/T2037

Even if this is something added by some distro downstream, what is the
benefit in using it, compared with libgcrypt-confg which should already
work & is portable.

> 
> Signed-off-by: He Zhe <zhe.he@windriver.com>
> ---
>  configure | 48 ++++++++++++++++++++++++++++++++++++++++--------
>  1 file changed, 40 insertions(+), 8 deletions(-)
> 
> diff --git a/configure b/configure
> index e44e454..0f362a7 100755
> --- a/configure
> +++ b/configure
> @@ -2875,6 +2875,30 @@ has_libgcrypt() {
>      return 0
>  }
>  
> +has_libgcrypt_pkgconfig() {
> +    if ! has $pkg_config ; then
> +        return 1
> +    fi
> +
> +    if ! $pkg_config --list-all | grep libgcrypt > /dev/null 2>&1 ; then
> +        return 1
> +    fi
> +
> +    if test -n "$cross_prefix" ; then
> +        host=$($pkg_config --variable=host libgcrypt)
> +        if test "${host%-gnu}-" != "${cross_prefix%-gnu}" ; then
> +            print_error "host($host) does not match cross_prefix($cross_prefix)"
> +            return 1
> +        fi
> +    fi
> +
> +    if ! $pkg_config --atleast-version=1.5.0 libgcrypt ; then
> +        print_error "libgcrypt version is $($pkg_config --modversion libgcrypt)"
> +        return 1
> +    fi
> +
> +    return 0
> +}
>  
>  if test "$nettle" != "no"; then
>      pass="no"
> @@ -2902,7 +2926,14 @@ fi
>  
>  if test "$gcrypt" != "no"; then
>      pass="no"
> -    if has_libgcrypt; then
> +    if has_libgcrypt_pkgconfig; then
> +        gcrypt_cflags=$($pkg_config --cflags libgcrypt)
> +        if test "$static" = "yes" ; then
> +            gcrypt_libs=$($pkg_config --libs --static libgcrypt)
> +        else
> +            gcrypt_libs=$($pkg_config --libs libgcrypt)
> +        fi
> +    elif has_libgcrypt; then
>          gcrypt_cflags=$(libgcrypt-config --cflags)
>          gcrypt_libs=$(libgcrypt-config --libs)
>          # Debian has removed -lgpg-error from libgcrypt-config
> @@ -2912,15 +2943,16 @@ if test "$gcrypt" != "no"; then
>          then
>              gcrypt_libs="$gcrypt_libs -lgpg-error"
>          fi
> +    fi
>  
> -        # Link test to make sure the given libraries work (e.g for static).
> -        write_c_skeleton
> -        if compile_prog "" "$gcrypt_libs" ; then
> -            LIBS="$gcrypt_libs $LIBS"
> -            QEMU_CFLAGS="$QEMU_CFLAGS $gcrypt_cflags"
> -            pass="yes"
> -        fi
> +    # Link test to make sure the given libraries work (e.g for static).
> +    write_c_skeleton
> +    if compile_prog "" "$gcrypt_libs" ; then
> +	    LIBS="$gcrypt_libs $LIBS"
> +	    QEMU_CFLAGS="$QEMU_CFLAGS $gcrypt_cflags"
> +	    pass="yes"
>      fi
> +
>      if test "$pass" = "yes"; then
>          gcrypt="yes"
>          cat > $TMPC << EOF
> -- 
> 2.7.4
> 

Regards,
Daniel
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