Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Petri Gynther]

This commit breaks the perf tool MIPS build because MIPS doesn't have
CONFIG_PERF_REGS=y in .config-detected:

commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
Author: Stephane Eranian <eranian@xxxxxxxxxx>
Date:   Mon Aug 31 18:41:12 2015 +0200

    perf record: Add ability to name registers to record

On Fri, Sep 4, 2015 at 3:19 PM, Petri Gynther <pgynther@xxxxxxxxxx> wrote:
> I see that this patch is now in upstream. However, something else has
> now broken the perf tool MIPS build:
>
> linux/tools$ git describe
> v4.2-7656-g51e771c
>
> linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
> mkdir -p  .
> make --no-print-directory -C perf O= subdir=
>   BUILD:   Doing 'make -j12' parallel build
>
> Auto-detecting system features:
> ...                         dwarf: [ OFF ]
> ...                         glibc: [ on  ]
> ...                          gtk2: [ OFF ]
> ...                      libaudit: [ OFF ]
> ...                        libbfd: [ OFF ]
> ...                        libelf: [ OFF ]
> ...                       libnuma: [ OFF ]
> ...                       libperl: [ OFF ]
> ...                     libpython: [ OFF ]
> ...                      libslang: [ OFF ]
> ...                     libunwind: [ OFF ]
> ...            libdw-dwarf-unwind: [ OFF ]
> ...                          zlib: [ OFF ]
> ...                          lzma: [ OFF ]
>
> ...
>
>   AR       libperf.a
>   LINK     perf
> libperf.a(libperf-in.o): In function `parse_regs':
> (.text+0x9f5b4): undefined reference to `sample_reg_masks'
> libperf.a(libperf-in.o): In function `parse_regs':
> (.text+0x9f604): undefined reference to `sample_reg_masks'
> libperf.a(libperf-in.o): In function `parse_regs':
> (.text+0x9f708): undefined reference to `sample_reg_masks'
> collect2: error: ld returned 1 exit status
> make[2]: *** [perf] Error 1
> make[1]: *** [all] Error 2
> make: *** [perf] Error 2
>
> On Tue, Aug 4, 2015 at 5:38 PM, Petri Gynther <pgynther@xxxxxxxxxx> wrote:
>> linux/tools$ make ARCH=mips CROSS_COMPILE=mipsel-linux- perf
>> ...
>> config/Makefile:256: *** No gnu/libc-version.h found, please install
>> glibc-dev[el].  Stop.
>> make[1]: *** [all] Error 2
>> make: *** [perf] Error 2
>>
>> ...
>> In file included from builtin-sched.c:13:0:
>> util/cloexec.h:8:12: error: redundant redeclaration of âsched_getcpuâ
>>  [-Werror=redundant-decls]
>>  extern int sched_getcpu(void) __THROW;
>>
>> mipsel-buildroot-linux-uclibc/sysroot/usr/include/bits/sched.h:88:12:
>>  note: previous declaration of âsched_getcpuâ was here
>>  extern int sched_getcpu (void) __THROW;
>>
>> uclibc info:
>> sysroot/usr/include/bits/uClibc_config.h
>> __UCLIBC_MAJOR__ 0
>> __UCLIBC_MINOR__ 9
>> __UCLIBC_SUBLEVEL__ 33
>>
>> sysroot/usr/include/features.h
>> __UCLIBC__ 1
>> __GLIBC__ 2
>> __GLIBC_MINOR__ 2
>>
>> Signed-off-by: Petri Gynther <pgynther@xxxxxxxxxx>
>> ---
>>  tools/build/feature/test-glibc.c | 11 +++++++++++
>>  tools/perf/util/cloexec.h        |  2 +-
>>  2 files changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/build/feature/test-glibc.c b/tools/build/feature/test-glibc.c
>> index b082034..9367f75 100644
>> --- a/tools/build/feature/test-glibc.c
>> +++ b/tools/build/feature/test-glibc.c
>> @@ -1,8 +1,19 @@
>> +#include <stdlib.h>
>> +
>> +#if !defined(__UCLIBC__)
>>  #include <gnu/libc-version.h>
>> +#else
>> +#define XSTR(s) STR(s)
>> +#define STR(s) #s
>> +#endif
>>
>>  int main(void)
>>  {
>> +#if !defined(__UCLIBC__)
>>         const char *version = gnu_get_libc_version();
>> +#else
>> +       const char *version = XSTR(__GLIBC__) "." XSTR(__GLIBC_MINOR__);
>> +#endif
>>
>>         return (long)version;
>>  }
>> diff --git a/tools/perf/util/cloexec.h b/tools/perf/util/cloexec.h
>> index 68888c2..3bee677 100644
>> --- a/tools/perf/util/cloexec.h
>> +++ b/tools/perf/util/cloexec.h
>> @@ -4,7 +4,7 @@
>>  unsigned long perf_event_open_cloexec_flag(void);
>>
>>  #ifdef __GLIBC_PREREQ
>> -#if !__GLIBC_PREREQ(2, 6)
>> +#if !__GLIBC_PREREQ(2, 6) && !defined(__UCLIBC__)
>>  extern int sched_getcpu(void) __THROW;
>>  #endif
>>  #endif
>> --
>> 2.5.0.rc2.392.g76e840b
>>
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