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[Qemu-devel] [PATCH v3 03/18] build-sys: add a rule to print a variable
From: |
Marc-André Lureau |
Subject: |
[Qemu-devel] [PATCH v3 03/18] build-sys: add a rule to print a variable |
Date: |
Thu, 4 Jan 2018 17:05:08 +0100 |
$ 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 <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
Makefile | 5 ++++-
docs/devel/build-system.txt | 13 +++++++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
index 1671db3bdd..f26ef1b1df 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 386ef36ee3..52501f2ad9 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.
--
2.15.1.355.g36791d7216
- [Qemu-devel] [PATCH v3 00/18] Various build-sys and sanitizer related fixes, Marc-André Lureau, 2018/01/04
- [Qemu-devel] [PATCH v3 01/18] build-sys: fix qemu-ga -pthread linking, Marc-André Lureau, 2018/01/04
- [Qemu-devel] [PATCH v3 02/18] build-sys: silence make by default or V=0, Marc-André Lureau, 2018/01/04
- [Qemu-devel] [PATCH v3 03/18] build-sys: add a rule to print a variable,
Marc-André Lureau <=
- [Qemu-devel] [PATCH v3 04/18] build-sys: compile with -Og or -O1 when --enable-debug, Marc-André Lureau, 2018/01/04
- [Qemu-devel] [PATCH v3 05/18] tests/docker: add some sanitizers to fedora dockerfile, Marc-André Lureau, 2018/01/04
- [Qemu-devel] [PATCH v3 06/18] tests/docker: add test-debug, Marc-André Lureau, 2018/01/04
- [Qemu-devel] [PATCH v3 07/18] build-sys: add some sanitizers when --enable-debug if possible, Marc-André Lureau, 2018/01/04
- [Qemu-devel] [PATCH v3 08/18] tests: fix check-qobject leak, Marc-André Lureau, 2018/01/04