From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41575) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZxYf-0007Jl-Kf for qemu-devel@nongnu.org; Fri, 12 Jan 2018 06:31:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eZxYb-0004e7-TZ for qemu-devel@nongnu.org; Fri, 12 Jan 2018 06:31:37 -0500 Received: from mail-wm0-x231.google.com ([2a00:1450:400c:c09::231]:40320) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eZxYb-0004bg-M3 for qemu-devel@nongnu.org; Fri, 12 Jan 2018 06:31:33 -0500 Received: by mail-wm0-x231.google.com with SMTP id v123so2002244wmd.5 for ; Fri, 12 Jan 2018 03:31:33 -0800 (PST) Sender: Paolo Bonzini From: Paolo Bonzini Date: Fri, 12 Jan 2018 12:30:35 +0100 Message-Id: <1515756676-3860-12-git-send-email-pbonzini@redhat.com> In-Reply-To: <1515756676-3860-1-git-send-email-pbonzini@redhat.com> References: <1515756676-3860-1-git-send-email-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PULL 11/52] build-sys: add a rule to print a variable List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= From: Marc-André Lureau $ make print-CFLAGS CFLAGS=-fsanitize=address -Og -g Trick from various sources: https://stackoverflow.com/questions/16467718/how-to-print-out-a-variable-in-makefile https://www.cmcrossroads.com/article/printing-value-makefile-variable Signed-off-by: Marc-André Lureau Reviewed-by: Eric Blake Message-Id: <20180104160523.22995-4-marcandre.lureau@redhat.com> Tested-by: Philippe Mathieu-Daudé Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Paolo Bonzini --- Makefile | 5 ++++- docs/devel/build-system.txt | 13 +++++++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 1671db3..f26ef1b 100644 --- a/Makefile +++ b/Makefile @@ -8,9 +8,12 @@ SRC_PATH=. UNCHECKED_GOALS := %clean TAGS cscope ctags dist \ html info pdf txt \ - help check-help \ + help check-help print-% \ docker docker-% vm-test vm-build-% +print-%: + @echo '$*=$($*)' + # All following code might depend on configuration variables ifneq ($(wildcard config-host.mak),) # Put the all: rule here so that config-host.mak can contain dependencies. diff --git a/docs/devel/build-system.txt b/docs/devel/build-system.txt index 386ef36..52501f2 100644 --- a/docs/devel/build-system.txt +++ b/docs/devel/build-system.txt @@ -510,3 +510,16 @@ default-configs/$TARGET-NAME file as input. This is the entrypoint used when make recurses to build a single system or userspace emulator target. It is merely a symlink back to the Makefile.target in the top level. + + +Useful make targets +=================== + +- help + + Print a help message for the most common build targets. + +- print-VAR + + Print the value of the variable VAR. Useful for debugging the build + system. -- 1.8.3.1