The $(LIBBPF) target should only be a dependency of prepare if the
static version of libbpf is needed. Add a new LIBBPF_STATIC variable
that is set by Makefile.config. Use LIBBPF_STATIC to determine whether
the CFLAGS, etc. need updating and for adding $(LIBBPF) as a prepare
dependency.
As Makefile.config isn't loaded for "clean" as a target, always set
LIBBPF_OUTPUT regardless of whether it is needed for $(LIBBPF). This
is done to minimize conditional logic for $(LIBBPF)-clean.
This issue and an original fix was reported by Mike Leach in:
https://lore.kernel.org/lkml/[email protected]/
Fixes: 746bd29e348f ("perf build: Use tools/lib headers from install path")
Reported-by: Mike Leach <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
---
tools/perf/Makefile.config | 2 ++
tools/perf/Makefile.perf | 21 ++++++++++++---------
2 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index c2504c39bdcb..7c00ce0a7464 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -602,6 +602,8 @@ ifndef NO_LIBELF
dummy := $(error Error: No libbpf devel library found, please install libbpf-devel);
endif
else
+ # Libbpf will be built as a static library from tools/lib/bpf.
+ LIBBPF_STATIC := 1
CFLAGS += -DHAVE_LIBBPF_BTF__LOAD_FROM_KERNEL_BY_ID
CFLAGS += -DHAVE_LIBBPF_BPF_PROG_LOAD
CFLAGS += -DHAVE_LIBBPF_BPF_OBJECT__NEXT_PROGRAM
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 13e7d26e77f0..4e370462e7e1 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -303,10 +303,12 @@ ifneq ($(OUTPUT),)
else
LIBBPF_OUTPUT = $(CURDIR)/libbpf
endif
-LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
-LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
-LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
-CFLAGS += -I$(LIBBPF_OUTPUT)/include
+ifdef LIBBPF_STATIC
+ LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
+ LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
+ LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
+ CFLAGS += -I$(LIBBPF_OUTPUT)/include
+endif
ifneq ($(OUTPUT),)
LIBSUBCMD_OUTPUT = $(abspath $(OUTPUT))/libsubcmd
@@ -393,10 +395,8 @@ endif
export PERL_PATH
PERFLIBS = $(LIBAPI) $(LIBPERF) $(LIBSUBCMD) $(LIBSYMBOL)
-ifndef NO_LIBBPF
- ifndef LIBBPF_DYNAMIC
- PERFLIBS += $(LIBBPF)
- endif
+ifdef LIBBPF_STATIC
+ PERFLIBS += $(LIBBPF)
endif
# We choose to avoid "if .. else if .. else .. endif endif"
@@ -756,12 +756,15 @@ prepare: $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h archheaders $(drm_ioc
$(arch_errno_name_array) \
$(sync_file_range_arrays) \
$(LIBAPI) \
- $(LIBBPF) \
$(LIBPERF) \
$(LIBSUBCMD) \
$(LIBSYMBOL) \
bpf-skel
+ifdef LIBBPF_STATIC
+prepare: $(LIBBPF)
+endif
+
$(OUTPUT)%.o: %.c prepare FORCE
$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=$(build-dir) $@
--
2.39.0.314.g84b9a713c41-goog
On Fri, 6 Jan 2023 at 14:25, Ian Rogers <[email protected]> wrote:
>
> The $(LIBBPF) target should only be a dependency of prepare if the
> static version of libbpf is needed. Add a new LIBBPF_STATIC variable
> that is set by Makefile.config. Use LIBBPF_STATIC to determine whether
> the CFLAGS, etc. need updating and for adding $(LIBBPF) as a prepare
> dependency.
>
> As Makefile.config isn't loaded for "clean" as a target, always set
> LIBBPF_OUTPUT regardless of whether it is needed for $(LIBBPF). This
> is done to minimize conditional logic for $(LIBBPF)-clean.
>
> This issue and an original fix was reported by Mike Leach in:
> https://lore.kernel.org/lkml/[email protected]/
>
> Fixes: 746bd29e348f ("perf build: Use tools/lib headers from install path")
> Reported-by: Mike Leach <[email protected]>
> Signed-off-by: Ian Rogers <[email protected]>
> ---
> tools/perf/Makefile.config | 2 ++
> tools/perf/Makefile.perf | 21 ++++++++++++---------
> 2 files changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index c2504c39bdcb..7c00ce0a7464 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -602,6 +602,8 @@ ifndef NO_LIBELF
> dummy := $(error Error: No libbpf devel library found, please install libbpf-devel);
> endif
> else
> + # Libbpf will be built as a static library from tools/lib/bpf.
> + LIBBPF_STATIC := 1
> CFLAGS += -DHAVE_LIBBPF_BTF__LOAD_FROM_KERNEL_BY_ID
> CFLAGS += -DHAVE_LIBBPF_BPF_PROG_LOAD
> CFLAGS += -DHAVE_LIBBPF_BPF_OBJECT__NEXT_PROGRAM
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index 13e7d26e77f0..4e370462e7e1 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -303,10 +303,12 @@ ifneq ($(OUTPUT),)
> else
> LIBBPF_OUTPUT = $(CURDIR)/libbpf
> endif
> -LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
> -LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
> -LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
> -CFLAGS += -I$(LIBBPF_OUTPUT)/include
> +ifdef LIBBPF_STATIC
> + LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
> + LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
> + LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
> + CFLAGS += -I$(LIBBPF_OUTPUT)/include
> +endif
>
> ifneq ($(OUTPUT),)
> LIBSUBCMD_OUTPUT = $(abspath $(OUTPUT))/libsubcmd
> @@ -393,10 +395,8 @@ endif
> export PERL_PATH
>
> PERFLIBS = $(LIBAPI) $(LIBPERF) $(LIBSUBCMD) $(LIBSYMBOL)
> -ifndef NO_LIBBPF
> - ifndef LIBBPF_DYNAMIC
> - PERFLIBS += $(LIBBPF)
> - endif
> +ifdef LIBBPF_STATIC
> + PERFLIBS += $(LIBBPF)
> endif
>
> # We choose to avoid "if .. else if .. else .. endif endif"
> @@ -756,12 +756,15 @@ prepare: $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h archheaders $(drm_ioc
> $(arch_errno_name_array) \
> $(sync_file_range_arrays) \
> $(LIBAPI) \
> - $(LIBBPF) \
> $(LIBPERF) \
> $(LIBSUBCMD) \
> $(LIBSYMBOL) \
> bpf-skel
>
> +ifdef LIBBPF_STATIC
> +prepare: $(LIBBPF)
> +endif
> +
> $(OUTPUT)%.o: %.c prepare FORCE
> $(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=$(build-dir) $@
>
> --
> 2.39.0.314.g84b9a713c41-goog
>
Tested-by: Mike Leach <[email protected]>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK