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

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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 <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: "Naveen N. Rao" <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Victor Kamensky <[email protected]>
Cc: Vinson Lee <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-09-17 12:54:30 -03:00
commit b0063dbfb0
5 changed files with 28 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

6
tools/build/Makefile.feature
View file

@ -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

6
tools/build/feature/Makefile
View file

@ -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)

5
tools/build/feature/test-all.c
View file

@ -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;
}

7
tools/build/feature/test-get_cpuid.c Normal file
View file

@ -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);
}