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common.mak: Fix slow build

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The relative subdirectory path of a build target is determined via a
separate shell command that issues 'cd' and 'pwd'. Spawning a separate
shell is very costly and can lead to extremely slow builds in some
circumstances.

Replace the shell command with the make built-in command 'realpath' to
accomplish the same result more efficiently.

Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
This commit is contained in:
Jan Höppner
2023-05-10 17:29:02 +02:00
committed by Steffen Eiden
parent 2c7e61a6c7
commit 908067bdf9
1 changed files with 1 additions and 2 deletions
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common.mak
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@@ -22,8 +22,7 @@ DISTRELEASE = build-$(shell date +%Y%m%d)
S390_TOOLS_RELEASE = $(VERSION).$(RELEASE).$(PATCHLEVEL)-$(DISTRELEASE)
export S390_TOOLS_RELEASE
reldir = $(subst $(shell cd -P $(dir $(filter %common.mak,$(MAKEFILE_LIST))); \
pwd)/,,$(CURDIR))
reldir = $(subst $(realpath $(dir $(filter %common.mak,$(MAKEFILE_LIST))))/,,$(CURDIR))
rootdir= $(dir $(filter %common.mak,$(MAKEFILE_LIST)))
export S390_TEST_LIB_PATH=$(rootdir)/s390-tools-testsuite/lib