Re: [PATCH v2 0/3] configure: respect --without-<package> flags

> Current git's configure script allow --without-<package>,
> it rightfully set NO_<PACKAGE> in the beginning of the configure script,
> but overwrite them with autodetect later.
> 
> Respect them now.

> 
> Change from v1:
> - Simply check if NO_<PACKAGE> is empty or not instead of explicitly
>   check for YesPlease
> - --without-openssl will ignore libcrypto all-together and fallback
>   into DC_SHA1
> 
> Đoàn Trần Công Danh (3):
>   configure: respect --without-curl flag
>   configure: respect --without-expat flag
>   configure: respect --without-openssl flag
> 
>  configure.ac | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> Interdiff against v1:
> diff --git a/configure.ac b/configure.ac
> index 20a11e1f32..807bb8bc5a 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -542,17 +542,18 @@ AC_MSG_NOTICE([CHECKS for libraries])
>  
>  GIT_STASH_FLAGS($OPENSSLDIR)
>  
> +if test -z "$NO_OPENSSL"; then
>  AC_CHECK_LIB([crypto], [SHA1_Init],
>  [NEEDS_SSL_WITH_CRYPTO=],
> -[
> -if "x$NO_OPENSSL" = xYesPlease; then
> -	AC_MSG_ERROR([Disabled OpenSSL is required for SHA1])
> +[AC_CHECK_LIB([ssl], [SHA1_Init],
> + [NEEDS_SSL_WITH_CRYPTO=YesPlease NO_OPENSSL=],
> + [NEEDS_SSL_WITH_CRYPTO=          NO_OPENSSL=YesPlease])])
>  else
> -	AC_CHECK_LIB([ssl], [SHA1_Init],
> -	[NEEDS_SSL_WITH_CRYPTO=YesPlease NO_OPENSSL=],
> -	[NEEDS_SSL_WITH_CRYPTO=          NO_OPENSSL=YesPlease])
> +	# Fallback to DC SHA1
> +	NEEDS_SSL_WITH_CRYPTO=
> +	DC_SHA1=YesPlease
> +	GIT_CONF_SUBST([DC_SHA1])
>  fi
> -])
>  
>  GIT_UNSTASH_FLAGS($OPENSSLDIR)
>  
> @@ -598,17 +599,19 @@ fi
>  # git-http-push are not built, and you cannot use http:// and https://
>  # transports.
>  
> -# Respect --without-curl
> -if test "x$NO_CURL" != "xYesPlease"; then
> -
>  GIT_STASH_FLAGS($CURLDIR)
>  
> +# Respect --without-curl
> +if test -z "$NO_CURL"; then
>  AC_CHECK_LIB([curl], [curl_global_init],
>  [NO_CURL=],
>  [NO_CURL=YesPlease])
> +fi
>  
>  GIT_UNSTASH_FLAGS($CURLDIR)
>  
> +GIT_CONF_SUBST([NO_CURL])
> +
>  if test -z "$NO_CURL"; then
>  
>  AC_CHECK_PROG([CURL_CONFIG], [curl-config],
> @@ -629,27 +632,22 @@ fi
>  
>  fi
>  
> -fi
> -
> -GIT_CONF_SUBST([NO_CURL])
>  
>  #
>  # Define NO_EXPAT if you do not have expat installed.  git-http-push is
>  # not built, and you cannot push using http:// and https:// transports.
>  
> -# Respect --without-expat
> -if test "x$NO_EXPAT" != xYesPlease; then
> -
>  GIT_STASH_FLAGS($EXPATDIR)
>  
> +# Respect --without-expat
> +if test -z "$NO_EXPAT"; then
>  AC_CHECK_LIB([expat], [XML_ParserCreate],
>  [NO_EXPAT=],
>  [NO_EXPAT=YesPlease])
> +fi
>  
>  GIT_UNSTASH_FLAGS($EXPATDIR)
>  
> -fi
> -
>  GIT_CONF_SUBST([NO_EXPAT])
>  
>  #
> -- 
> 2.26.0.rc2.234.g969ad452ca
>