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perf tools: Use Python devtools for version autodetection rather than runtime

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This fixes the issue where the build will fail if only the Python2
runtime is installed but the Python3 devtools are installed. Currently
the workaround is 'make PYTHON=python3'.

Fix it by autodetecting Python based on whether python[x]-config exists
rather than just python[x] because both are needed for the build. Then
-config is stripped to find the Python runtime.

Testing
=======

 * Auto detect links with Python3 when the v3 devtools are installed
   and only Python 2 runtime is installed
 * Auto detect links with Python2 when both devtools are installed
 * Sensible warning is printed if no Python devtools are installed
 * 'make PYTHON=x' still automatically sets PYTHON_CONFIG=x-config
 * 'make PYTHON=x' fails if x-config doesn't exist
 * 'make PYTHON=python3' overrides Python2 devtools
 * 'make PYTHON=python2' overrides Python3 devtools
 * 'make PYTHON_CONFIG=x-config' works
 * 'make PYTHON=x PYTHON_CONFIG=x' works
 * 'make PYTHON=missing' reports an error
 * 'make PYTHON_CONFIG=missing' reports an error

Fixes: 79373082fa ("perf python: Autodetect python3 binary")
Signed-off-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220309194313.3350126-2-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
James Clark 2022-03-09 19:43:13 +00:00 committed by Arnaldo Carvalho de Melo
parent 570c44a01b
commit 630af16eee
1 changed files with 27 additions and 12 deletions
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39
tools/perf/Makefile.config
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@ -239,18 +239,33 @@ ifdef PARSER_DEBUG
endif
# Try different combinations to accommodate systems that only have
# python[2][-config] in weird combinations but always preferring
# python2 and python2-config as per pep-0394. If python2 or python
# aren't found, then python3 is used.
PYTHON_AUTO := python
PYTHON_AUTO := $(if $(call get-executable,python3),python3,$(PYTHON_AUTO))
PYTHON_AUTO := $(if $(call get-executable,python),python,$(PYTHON_AUTO))
PYTHON_AUTO := $(if $(call get-executable,python2),python2,$(PYTHON_AUTO))
override PYTHON := $(call get-executable-or-default,PYTHON,$(PYTHON_AUTO))
PYTHON_AUTO_CONFIG := \
$(if $(call get-executable,$(PYTHON)-config),$(PYTHON)-config,python-config)
override PYTHON_CONFIG := \
$(call get-executable-or-default,PYTHON_CONFIG,$(PYTHON_AUTO_CONFIG))
# python[2][3]-config in weird combinations in the following order of
# priority from lowest to highest:
# * python3-config
# * python-config
# * python2-config as per pep-0394.
# * $(PYTHON)-config (If PYTHON is user supplied but PYTHON_CONFIG isn't)
#
PYTHON_AUTO := python-config
PYTHON_AUTO := $(if $(call get-executable,python3-config),python3-config,$(PYTHON_AUTO))
PYTHON_AUTO := $(if $(call get-executable,python-config),python-config,$(PYTHON_AUTO))
PYTHON_AUTO := $(if $(call get-executable,python2-config),python2-config,$(PYTHON_AUTO))
# If PYTHON is defined but PYTHON_CONFIG isn't, then take $(PYTHON)-config as if it was the user
# supplied value for PYTHON_CONFIG. Because it's "user supplied", error out if it doesn't exist.
ifdef PYTHON
ifndef PYTHON_CONFIG
PYTHON_CONFIG_AUTO := $(call get-executable,$(PYTHON)-config)
PYTHON_CONFIG := $(if $(PYTHON_CONFIG_AUTO),$(PYTHON_CONFIG_AUTO),\
$(call $(error $(PYTHON)-config not found)))
endif
endif
# Select either auto detected python and python-config or use user supplied values if they are
# defined. get-executable-or-default fails with an error if the first argument is supplied but
# doesn't exist.
override PYTHON_CONFIG := $(call get-executable-or-default,PYTHON_CONFIG,$(PYTHON_AUTO))
override PYTHON := $(call get-executable-or-default,PYTHON,$(subst -config,,$(PYTHON_AUTO)))
grep-libs = $(filter -l%,$(1))
strip-libs = $(filter-out -l%,$(1))