[FFmpeg-trac] #11121(build system:new): configure: fails to detect pthread_setname_np

[FFmpeg]

#11121: configure: fails to detect pthread_setname_np
-------------------------------------+-------------------------------------
             Reporter:  Sebastian    |                     Type:  defect
  Ramacher                           |
               Status:  new          |                 Priority:  normal
            Component:  build        |                  Version:  git-
  system                             |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Builds on Debian currently produce the following warning:
 {{{
 gcc -I. -Isrc/ -Wdate-time -D_FORTIFY_SOURCE=2 -U_FORTIFY_SOURCE
 -D_FORTIFY_SOURCE=2 -D_ISOC11_SOURCE -D_FILE_OFFSET_BITS=64
 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC
 -DZLIB_CONST -DHAVE_AV_CONFIG_H -DBUILDING_avfilter -g -O2 -Werror
 =implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=.
 -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-
 security -fcf-protection -fno-strict-overflow -fstack-protector-all -fPIE
 -std=c17 -fomit-frame-pointer -fPIC     -pthread
 -I/usr/include/p11-kit-1  -I/usr/include/lilv-0 -I/usr/include/serd-0
 -I/usr/include/sord-0 -I/usr/include/zix-0 -I/usr/include/sratom-0
 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz
 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
 -I/usr/include/sysprof-6 -pthread -I/usr/include/fribidi
 -I/usr/include/libxml2 -I/usr/include/freetype2 -I/usr/include/libpng16
 -I/usr/include/bs2b    -I/usr/include/libdrm   -I/usr/include/freetype2
 -I/usr/include/libpng16 -I/usr/include/freetype2 -I/usr/include/libpng16
 -I/usr/include/fribidi -I/usr/include/harfbuzz -I/usr/include/freetype2
 -I/usr/include/libpng16 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-
 gnu/glib-2.0/include -I/usr/include/sysprof-6 -pthread
 -DHWY_SHARED_DEFINE  -I/usr/lib/x86_64-linux-
 gnu/pkgconfig/../../../include -I/usr/lib/x86_64-linux-
 gnu/pkgconfig/../../../include/vpl -DMFX_DEPRECATED_OFF
 -I/usr/include/openjpeg-2.5 -I/usr/include/x86_64-linux-gnu
 -I/usr/include/opus -I/usr/include/opus  -D_REENTRANT
 -I/usr/include/rav1e -I/usr/include/cjson -I/usr/include/librsvg-2.0
 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
 -I/usr/include/sysprof-6 -I/usr/include/libmount -I/usr/include/blkid
 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16
 -I/usr/include/x86_64-linux-gnu -I/usr/include/webp -pthread
 -I/usr/include/cairo -I/usr/include/freetype2 -I/usr/include/pixman-1
 -I/usr/include/srt -I/usr/include/p11-kit-1 -I/usr/include/svt-av1
 -DEB_DLL        -I/usr/include/webp -I/usr/include/webp -DX264_API_IMPORTS
 -isystem /usr/include/mit-krb5 -I/usr/include/pgm-5.3
 -I/usr/include/libxml2 -I/usr/include/x86_64-linux-gnu
 -I/usr/include/libxml2 -I/usr/include/AL  -I/usr/include/sphinxbase
 -I/usr/include/pocketsphinx -I/usr/include/x86_64-linux-gnu
 -I/usr/include/x86_64-linux-gnu/sphinxbase        -I/usr/include/libdrm
 -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-
 arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-
 prototypes -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch
 -Wno-format-zero-length -Wno-pointer-sign -Wno-unused-const-variable -Wno-
 bool-operation -Wno-char-subscripts -O3 -fno-math-errno -fno-signed-zeros
 -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-
 declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla
 -Wformat -fdiagnostics-color=auto -Wno-maybe-uninitialized
 -I/usr/include/SDL2 -D_REENTRANT   -MMD -MF libavfilter/scale_eval.d -MT
 libavfilter/scale_eval.o -c -o libavfilter/scale_eval.o
 src/libavfilter/scale_eval.c
 In file included from src/libavutil/common.h:48,
                  from src/libavutil/avutil.h:301,
                  from src/libavutil/opt.h:31,
                  from src/libavdevice/sdl2.c:31:
 ./config.h:335:9: warning: "HAVE_PTHREAD_SETNAME_NP" redefined
   335 | #define HAVE_PTHREAD_SETNAME_NP 0
       |         ^~~~~~~~~~~~~~~~~~~~~~~
 In file included from /usr/include/SDL2/SDL_config.h:4,
                  from /usr/include/SDL2/SDL_stdinc.h:31,
                  from /usr/include/SDL2/SDL_main.h:25,
                  from /usr/include/SDL2/SDL.h:32,
                  from src/libavdevice/sdl2.c:26:
 /usr/include/x86_64-linux-gnu/SDL2/_real_SDL_config.h:209:9: note: this is
 the location of the previous definition
   209 | #define HAVE_PTHREAD_SETNAME_NP 1
       |         ^~~~~~~~~~~~~~~~~~~~~~~
 }}}

 This indicates that `configure` does not detect the availability of
 `pthread_setname_np`. Indeed, even on master I get (on Debian unstable)
 with no flags passed to `configure`:

 {{{
 $ grep PTHREAD config.h
 #define HAVE_PTHREAD_NP_H 0
 #define HAVE_PTHREAD_CANCEL 1
 #define HAVE_PTHREAD_SET_NAME_NP 0
 #define HAVE_PTHREAD_SETNAME_NP 0
 #define HAVE_PTHREADS 1
 }}}

 But the function is available:
 {{{
 $ nm -D /usr/lib/i386-linux-gnu/libc.so.6 | grep pthread_setname_np
 00091690 T pthread_setname_np at GLIBC_2.12
 00091690 T pthread_setname_np@@GLIBC_2.34
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11121>
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