[PATCH 20/43] perf unwind: Do not put libunwind-{x86,aarch64} in FEATURE_TESTS_BASIC

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

As it is not normally available on x86_64 not being tested on test-all.c
but being in FEATURE_TESTS_BASIC ends up implying that those features
are present, which leads to trying to link with those libraries and a
build failure now that test-all.c is finally again building
successfully:

  /usr/bin/ld: cannot find -lunwind-x86
  /usr/bin/ld: cannot find -lunwind-aarch64
  collect2: error: ld returned 1 exit status
  make[3]: *** [Makefile:199: /tmp/build/perf/plugin_jbd2.so] Error 1
  make[3]: *** Waiting for unfinished jobs....
  /usr/bin/ld: cannot find -lunwind-x86
  /usr/bin/ld: cannot find -lunwind-aarch64

So remove those features from there and explicitely test them.

And then move this patch to just before the last one that allows this to
be exposed, so that we keep the tree bisectable.

With all this in place we get, at this point:

  $ ldd /tmp/build/perf/feature/test-libunwind.bin
	linux-vdso.so.1 (0x00007fffa09c6000)
	libunwind-x86_64.so.8 => /lib64/libunwind-x86_64.so.8 (0x00007fbcf4451000)
	libunwind.so.8 => /lib64/libunwind.so.8 (0x00007fbcf4435000)
	liblzma.so.5 => /lib64/liblzma.so.5 (0x00007fbcf440c000)
	libelf.so.1 => /lib64/libelf.so.1 (0x00007fbcf43f2000)
	libc.so.6 => /lib64/libc.so.6 (0x00007fbcf422c000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fbcf4211000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fbcf4491000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fbcf41ed000)
	libz.so.1 => /lib64/libz.so.1 (0x00007fbcf41d3000)
  $ cat /tmp/build/perf/feature/test-libunwind-x86.make.output
  test-libunwind-x86.c:2:10: fatal error: libunwind-x86.h: No such file or directory
   #include <libunwind-x86.h>
            ^~~~~~~~~~~~~~~~~
  compilation terminated.
  $ cat /tmp/build/perf/feature/test-libunwind-aarch64.make.output
  test-libunwind-aarch64.c:2:10: fatal error: libunwind-aarch64.h: No such file or directory
  #include <libunwind-aarch64.h>
           ^~~~~~~~~~~~~~~~~~~~~
  compilation terminated.
  $
  $ ldd ~/bin/perf | grep unwind
	libunwind-x86_64.so.8 => /lib64/libunwind-x86_64.so.8 (0x00007f5ceb24b000)
	libunwind.so.8 => /lib64/libunwind.so.8 (0x00007f5ceb22f000)
  $

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: He Kuang <hekuang@xxxxxxxxxx>
Cc: Jean Pihet <jean.pihet@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Link: https://lkml.kernel.org/n/tip-vs6kwqsvwk7oxhs6z9mq87pp@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/build/Makefile.feature | 8 ++++----
 tools/perf/Makefile.config   | 7 +++++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index bb9dca65eb5f..61e46d54a67c 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -53,10 +53,6 @@ FEATURE_TESTS_BASIC :=                  \
         libslang                        \
         libcrypto                       \
         libunwind                       \
-        libunwind-x86                   \
-        libunwind-x86_64                \
-        libunwind-arm                   \
-        libunwind-aarch64               \
         pthread-attr-setaffinity-np     \
         pthread-barrier     		\
         reallocarray                    \
@@ -84,6 +80,10 @@ FEATURE_TESTS_EXTRA :=                  \
          libbfd-liberty                 \
          libbfd-liberty-z               \
          libopencsd                     \
+         libunwind-x86                  \
+         libunwind-x86_64               \
+         libunwind-arm                  \
+         libunwind-aarch64              \
          libunwind-debug-frame          \
          libunwind-debug-frame-arm      \
          libunwind-debug-frame-aarch64  \
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index cf4a8329c4c0..4b735042cad7 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -109,6 +109,11 @@ FEATURE_CHECK_LDFLAGS-libunwind = $(LIBUNWIND_LDFLAGS) $(LIBUNWIND_LIBS)
 FEATURE_CHECK_CFLAGS-libunwind-debug-frame = $(LIBUNWIND_CFLAGS)
 FEATURE_CHECK_LDFLAGS-libunwind-debug-frame = $(LIBUNWIND_LDFLAGS) $(LIBUNWIND_LIBS)
 
+FEATURE_CHECK_LDFLAGS-libunwind-arm = -lunwind -lunwind-arm
+FEATURE_CHECK_LDFLAGS-libunwind-aarch64 = -lunwind -lunwind-aarch64
+FEATURE_CHECK_LDFLAGS-libunwind-x86 = -lunwind -llzma -lunwind-x86
+FEATURE_CHECK_LDFLAGS-libunwind-x86_64 = -lunwind -llzma -lunwind-x86_64
+
 ifdef CSINCLUDES
   LIBOPENCSD_CFLAGS := -I$(CSINCLUDES)
 endif
@@ -485,6 +490,7 @@ endif
 ifndef NO_LIBUNWIND
   have_libunwind :=
 
+  $(call feature_check,libunwind-x86)
   ifeq ($(feature-libunwind-x86), 1)
     $(call detected,CONFIG_LIBUNWIND_X86)
     CFLAGS += -DHAVE_LIBUNWIND_X86_SUPPORT
@@ -493,6 +499,7 @@ ifndef NO_LIBUNWIND
     have_libunwind = 1
   endif
 
+  $(call feature_check,libunwind-aarch64)
   ifeq ($(feature-libunwind-aarch64), 1)
     $(call detected,CONFIG_LIBUNWIND_AARCH64)
     CFLAGS += -DHAVE_LIBUNWIND_AARCH64_SUPPORT
-- 
2.19.1