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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-02-23 11:29:27 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-02-23 11:29:39 -0800 |
| commit | f5d1f629c693bc30ccc8ff1246cb37986c1adb1c (patch) | |
| tree | 7ab5aa175267326f4e8aeeb600034a52e3aaafbb /sysdeps/unix/sysv/linux/i386/lowlevellock.h | |
| parent | 54412d20618b7b93f136a168e788573575f8a7a6 (diff) | |
| download | glibc-f5d1f629c693bc30ccc8ff1246cb37986c1adb1c.tar.gz glibc-f5d1f629c693bc30ccc8ff1246cb37986c1adb1c.tar.xz glibc-f5d1f629c693bc30ccc8ff1246cb37986c1adb1c.zip | |
Define GEN_AS_CONST_HEADERS when generating header files [BZ #22792]
Glibc build generates header files to define constants from special .sym files. If a .sym file includes the same header file which it generates, it leads to circular dependency which may lead to build hang on a many-core machine. Define GEN_AS_CONST_HEADERS when generating header files to avoid circular dependency. <tcb-offsets.h> is needed for i686 and it isn't needed for x86-64 at least since glibc 2.23. Tested on i686 and x86-64. [BZ #22792] * Makerules ($(common-objpfx)%.h): Pass -DGEN_AS_CONST_HEADERS to $(CC). * sysdeps/unix/sysv/linux/i386/lowlevellock.h: Include <tcb-offsets.h> only if GEN_AS_CONST_HEADERS isn't defined. * sysdeps/unix/sysv/linux/x86_64/lowlevellock.h: Don't include <tcb-offsets.h>.
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/lowlevellock.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/lowlevellock.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/lowlevellock.h b/sysdeps/unix/sysv/linux/i386/lowlevellock.h index fb59b57934..38fbc2556f 100644 --- a/sysdeps/unix/sysv/linux/i386/lowlevellock.h +++ b/sysdeps/unix/sysv/linux/i386/lowlevellock.h @@ -26,7 +26,14 @@ # include <sys/param.h> # include <bits/pthreadtypes.h> # include <kernel-features.h> -# include <tcb-offsets.h> +/* <tcb-offsets.h> is generated from tcb-offsets.sym to define offsets + and sizes of types in <tls.h> as well as <pthread.h> which includes + <lowlevellock.h> via nptl/descr.h. Don't include <tcb-offsets.h> + when generating <tcb-offsets.h> to avoid circular dependency which + may lead to build hang on a many-core machine. */ +# ifndef GEN_AS_CONST_HEADERS +# include <tcb-offsets.h> +# endif # ifndef LOCK_INSTR # ifdef UP |