tools build: Add test for presence of __get_cpuid() gcc builtin

The auxtrace code needed by Intel PT uses the __get_cpuid() gcc builtin,
that is not present in old systems, breaking the build.

Add a test to check for that builtin and disable AUXTRACE in those
systems.

  [acme@rhel5 linux]$  make NO_LIBPERL=1 -C tools/perf O=/tmp/build/perf install-bin
  make: Entering directory `/home/acme/git/linux/tools/perf'
    BUILD:   Doing 'make -j2' parallel build

  Auto-detecting system features:
  <SNIP>
  ...                          lzma: [ on  ]
  ...                     get_cpuid: [ OFF ]
  <SNIP>
  config/Makefile:630: Your gcc lacks the __get_cpuid() builtin, disables support for auxtrace/Intel PT, please install a newer gcc
    MKDIR    /tmp/build/perf/util/
  <SNIP>

This fixes the build on old systems such as RHEL/CentOS 5.11.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Victor Kamensky <victor.kamensky@linaro.org>
Cc: Vinson Lee <vlee@twopensource.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-d4puslul0jltoodzpx9r4sje@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 9702420..c8fe6d1 100644 (file)
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -52,7 +52,8 @@ FEATURE_TESTS ?=                      \
        timerfd                         \
        libdw-dwarf-unwind              \
        zlib                            \
-       lzma
+       lzma                            \
+       get_cpuid
 
 FEATURE_DISPLAY ?=                     \
        dwarf                           \
@@ -69,7 +70,8 @@ FEATURE_DISPLAY ?=                    \
        libunwind                       \
        libdw-dwarf-unwind              \
        zlib                            \
-       lzma
+       lzma                            \
+       get_cpuid
 
 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
 # If in the future we need per-feature checks/flags for features not

diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index e13a42b..e43a297 100644 (file)
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -35,7 +35,8 @@ FILES=                                        \
        test-compile-x32.bin            \
        test-zlib.bin                   \
        test-lzma.bin                   \
-       test-bpf.bin
+       test-bpf.bin                    \
+       test-get_cpuid.bin
 
 CC := $(CROSS_COMPILE)gcc -MD
 PKG_CONFIG := $(CROSS_COMPILE)pkg-config
@@ -166,6 +167,9 @@ test-zlib.bin:
 test-lzma.bin:
        $(BUILD) -llzma
 
+test-get_cpuid.bin:
+       $(BUILD)
+
 test-bpf.bin:
        $(BUILD)
 

diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index 7a8cdba..33cf6f2 100644 (file)
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -121,6 +121,10 @@
 # include "test-lzma.c"
 #undef main
 
+#define main main_test_get_cpuid
+# include "test-get_cpuid.c"
+#undef main
+
 int main(int argc, char *argv[])
 {
        main_test_libpython();
@@ -148,6 +152,7 @@ int main(int argc, char *argv[])
        main_test_zlib();
        main_test_pthread_attr_setaffinity_np();
        main_test_lzma();
+       main_test_get_cpuid();
 
        return 0;
 }

diff --git a/tools/build/feature/test-get_cpuid.c b/tools/build/feature/test-get_cpuid.c
new file mode 100644 (file)
index 0000000..d7a2c40
--- /dev/null
+++ b/tools/build/feature/test-get_cpuid.c
@@ -0,0 +1,7 @@
+#include <cpuid.h>
+
+int main(void)
+{
+       unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
+       return __get_cpuid(0x15, &eax, &ebx, &ecx, &edx);
+}

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 053e65b..38a0853 100644 (file)
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -626,8 +626,13 @@ ifdef LIBBABELTRACE
 endif
 
 ifndef NO_AUXTRACE
-  $(call detected,CONFIG_AUXTRACE)
-  CFLAGS += -DHAVE_AUXTRACE_SUPPORT
+  ifeq ($(feature-get_cpuid), 0)
+    msg := $(warning Your gcc lacks the __get_cpuid() builtin, disables support for auxtrace/Intel PT, please install a newer gcc);
+    NO_AUXTRACE := 1
+  else
+    $(call detected,CONFIG_AUXTRACE)
+    CFLAGS += -DHAVE_AUXTRACE_SUPPORT
+  endif
 endif
 
 # Among the variables below, these: