From: Masahiro Yamada <yamada.masahiro@socionext.com>
To: linux-kbuild@vger.kernel.org
Cc: Sam Ravnborg <sam@ravnborg.org>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Michal Marek <michal.lkml@markovi.net>,
linux-kernel@vger.kernel.org
Subject: [PATCH 5/8] kbuild: change if_changed_rule to accept multi-line recipe
Date: Thu, 15 Nov 2018 17:27:12 +0900 [thread overview]
Message-ID: <1542270435-11181-6-git-send-email-yamada.masahiro@socionext.com> (raw)
In-Reply-To: <1542270435-11181-1-git-send-email-yamada.masahiro@socionext.com>
GNU Make supports 'define' ... 'endef' directive, which can describe
a recipe that consists of multiple lines.
For example,
all:
@echo hello
@echo world
... can be written as:
define greeting
@echo hello
@echo world
endif
all:
$(greeting)
This is useful to confine a series of shell commands into a single
macro, keeping readability.
However, if_changed_rule cannot accept multi-line recipe. As you see
rule_cc_o_c and rule_as_o_S in scripts/Makefile.build, it must be
written like this:
define rule_cc_o_c
@[action1] ; \
[action2] ; \
[action3]
endef
This does not actually exploit the benefits of 'define' ... 'endef'
form. All shell commands must be concatenated with '; \' so that it
looks like a single command from the Makefile point of view. '@' can
only appear before the first action.
The root cause of this misfortune is the '@set -e;' in if_changed_rule.
It is easily solvable by moving '@set -e' to the 'cmd' macro.
The combo of $(call echo-cmd,*) $(cmd_*) in rule_cc_o_c and rule_as_o_S
were replaced with $(call cmd,*). The tailing back-slashes went away.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---
scripts/Kbuild.include | 6 ++----
scripts/Makefile.build | 22 +++++++++++-----------
2 files changed, 13 insertions(+), 15 deletions(-)
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 1eafc85..5e47bf6 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -215,7 +215,7 @@ echo-cmd = $(if $($(quiet)cmd_$(1)),\
echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
# printing commands
-cmd = @$(echo-cmd) $(cmd_$(1))
+cmd = @set -e; $(echo-cmd) $(cmd_$(1))
# Add $(obj)/ for paths that are not absolute
objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
@@ -269,9 +269,7 @@ cmd_and_fixdep = \
# Usage: $(call if_changed_rule,foo)
# Will check if $(cmd_foo) or any of the prerequisites changed,
# and if so will execute $(rule_foo).
-if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
- @set -e; \
- $(rule_$(1)), @:)
+if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)), $(rule_$(1)), @:)
###
# why - tell why a target got built
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index e5ba9b1..5528a6a 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -263,20 +263,20 @@ cmd_gen_ksymdeps = \
endif
define rule_cc_o_c
- $(call echo-cmd,checksrc) $(cmd_checksrc) \
- $(call cmd_and_fixdep,cc_o_c) \
- $(cmd_gen_ksymdeps) \
- $(cmd_checkdoc) \
- $(call echo-cmd,objtool) $(cmd_objtool) \
- $(cmd_modversions_c) \
- $(call echo-cmd,record_mcount) $(cmd_record_mcount)
+ $(call cmd,checksrc)
+ @$(call cmd_and_fixdep,cc_o_c)
+ $(call cmd,gen_ksymdeps)
+ $(call cmd,checkdoc)
+ $(call cmd,objtool)
+ $(call cmd,modversions_c)
+ $(call cmd,record_mcount)
endef
define rule_as_o_S
- $(call cmd_and_fixdep,as_o_S) \
- $(cmd_gen_ksymdeps) \
- $(call echo-cmd,objtool) $(cmd_objtool) \
- $(cmd_modversions_S)
+ @$(call cmd_and_fixdep,as_o_S)
+ $(call cmd,gen_ksymdeps)
+ $(call cmd,objtool)
+ $(call cmd,modversions_S)
endef
# List module undefined symbols (or empty line if not enabled)
--
2.7.4
next prev parent reply other threads:[~2018-11-15 8:28 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-15 8:27 [PATCH 0/8] kbuild: clean-up modversion, TRIM_UNUSED_KSYMS, if_changed_rule, etc Masahiro Yamada
2018-11-15 8:27 ` [PATCH 1/8] kbuild: remove redundant 'set -e' from filechk_* defines Masahiro Yamada
2018-11-15 8:27 ` [PATCH 2/8] kbuild: remove redundant 'set -e' from sub_cmd_record_mcount Masahiro Yamada
2018-11-15 8:27 ` [PATCH 3/8] kbuild: refactor modversions build rules Masahiro Yamada
2018-11-16 20:01 ` Sam Ravnborg
2018-11-18 5:00 ` Masahiro Yamada
2018-11-15 8:27 ` [PATCH 4/8] kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS Masahiro Yamada
2018-11-16 5:13 ` Nicolas Pitre
2018-11-16 7:13 ` Masahiro Yamada
2018-11-16 17:49 ` Nicolas Pitre
2018-11-20 1:13 ` Masahiro Yamada
2018-11-15 8:27 ` Masahiro Yamada [this message]
2018-11-15 9:12 ` [PATCH 5/8] kbuild: change if_changed_rule to accept multi-line recipe Rasmus Villemoes
2018-11-16 1:37 ` Masahiro Yamada
2018-11-15 8:27 ` [PATCH 6/8] kbuild: remove trailing semicolon from cmd_* passed to if_changed_rule Masahiro Yamada
2018-11-15 8:27 ` [PATCH 7/8] kbuild: refactor if_changed and if_changed_dep Masahiro Yamada
2018-11-15 8:27 ` [PATCH 8/8] kbuild: remove redundant 'set -e' from cmd_* defines Masahiro Yamada
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