Re: fatal error: pthread.h: No such file or directory

YuGiOhJCJ Mailing-List wrote:
> This command line is very important when I am cross-compiling:
> PKG_CONFIG_PATH="/usr/i686-pc-mingw32/lib/pkgconfig"

I ask "who told you to do such", not "why you do such".
I know what you want to do.

If you read pkg-config manual carefully, you will find
that PKG_CONFIG_PATH do not exclude the header files
for the building platform, so it is not good for the
cross-building for the platform with very different nature.

If you read pkg-config manual carefully, you will find
something better than PKG_CONFIG_PATH.

> What is strange is that if glib is a requirement for cross-compiling cairo, why the configure script does not tell me that it is missing for my cross-compiler?

For first, glib is required if you want to make cairo-
gobject. I don't know if you need cairo-gobject /or not.

In next, as I've written in above, using PKG_CONFIG_PATH
for cross-compiling is not good idea (I ask again, who
told you to use it?). It could not separate the packages
for building & target platforms. So, as far as glib for
the building platform is installed, pkg-config will act
as "glib is available".

If you complain as "why pkg-config does not check the
headers/libraries are compatible with the compiler/linker?",
you will complain almost all packages using pkg-config.
pkg-config is a tool to search a package quickly, by
package name, without testing compiling and linking.
I think it is a designed feature. People using pkg-config
in their configure script would agree with its designed
feature.

Regards,
mpsuzuki

> Without this command line, the "pkg-config" program will use this path "/usr/lib/pkgconfig" by default.
> The "/usr/lib/pkgconfig" path contains *.pc files that are useful when you do not cross-compile.
> 
> See the difference of the content for these *.pc files:
> /usr/lib/pkgconfig/sdl.pc:
>  [...]
>  prefix=/usr
>  [...]
>  Libs: -L${libdir} -Wl,-rpath,${libdir} -lSDL  -lpthread
>  [...]
> /usr/i686-pc-mingw32/lib/pkgconfig/sdl.pc:
>  [...]
>  prefix=/usr/i686-pc-mingw32
>  [...]
>  Libs: -L${libdir}  -lmingw32 -lSDLmain -lSDL  -mwindows
>  [...]
> 
> You can clearly see here that the prefix and libraries information in these files matches to the linux compiler when the path is "/usr/lib/pkgconfig" whereas they matches to the (linux to windows) cross-compiler when the path is "/usr/i686-pc-mingw32/lib/pkgconfig".
> So, that is why I am using this command line before cross-compiling.
> 
> Indeed you are right, the path of glib is not correct as we can see in the error messages.
> I think it is because glib is not at all installed for my cross-compiler.
> If you check the list of libraries I give in the previous e-mail, you will see that glib is not available.
> What is strange is that if glib is a requirement for cross-compiling cairo, why the configure script does not tell me that it is missing for my cross-compiler?
> Also, why the configure script choose the "/usr/include/glib-2.0" path for the glib headers?
> Do you think that if I cross-compile glib, the configure script will find it and will use the correct path automatically and solve my problem?
> 
> On Sun, 05 Jul 2015 11:16:09 +0900
> suzuki toshiya <[email protected]> wrote:
> 
>>> That is how I am doing to cross-compile cairo-1.14.2:
>>> $ PKG_CONFIG_PATH="/usr/i686-pc-mingw32/lib/pkgconfig"
>> Who told you to do such? Clearly it does not fit to
>> the cross building, as you see that GLib header files
>> for the building system are included, like,
>>
>>> In file included from /usr/include/glib-2.0/glib.h:107:0,
>>>                  from /usr/include/glib-2.0/gobject/gbinding.h:28,
>>>                  from /usr/include/glib-2.0/glib-object.h:23,
>> YuGiOhJCJ Mailing-List wrote:
>>> Hello,
>>>
>>> I try to cross-compile cairo-1.14.2 (because it is a dependency for gtk+-2.24.20).
>>> I do this with my cross-compiler (linux to windows) built with mingw32 and including all these libraries:
>>> binutils-2.24.51
>>> bzip2-1.0.6
>>> expat-2.1.0
>>> fontconfig-2.11.1
>>> freeglut-2.8.1
>>> freetype-2.4.10
>>> gcc-4.9.1
>>> gettext-0.18.2.1
>>> gtk+-1.2.10
>>> libffi-3.0.13
>>> libiconv-1.14
>>> libxml2-2.9.2
>>> libxmp-4.2.8
>>> mesa-9.1.3
>>> mingwrt-3.20.2
>>> sdl-1.2.15
>>> sdl-mixer-1.2.12
>>> sdl-net-1.2.8
>>> sdl-ttf-2.0.11
>>> smpeg-r389
>>> w32api-3.17.2
>>> xmp-4.0.8
>>> zlib-1.2.8
>>>
>>> That is how I am doing to cross-compile cairo-1.14.2:
>>> $ PKG_CONFIG_PATH="/usr/i686-pc-mingw32/lib/pkgconfig"
>>> $ tar xvf cairo-1.14.2.tar.xz
>>> $ cd cairo-1.14.2
>>> $ ./configure --prefix=/usr/i686-pc-mingw32 --host=i686-pc-mingw32 --enable-win32 --enable-win32-font --disable-xlib --disable-xlib-xrender --disable-xcb --disable-xlib-xcb --disable-xcb-shm --disable-pthread --without-x
>>> $ make
>>> [...]
>>> make[4]: Entering directory `/tmp/build/cairo-1.14.2/util/cairo-gobject'
>>>   CC       libcairo_gobject_la-cairo-gobject-enums.lo
>>> In file included from /usr/include/glib-2.0/glib.h:107:0,
>>>                  from /usr/include/glib-2.0/gobject/gbinding.h:28,
>>>                  from /usr/include/glib-2.0/glib-object.h:23,
>>>                  from cairo-gobject.h:44,
>>>                  from cairo-gobject-enums.c:8:
>>> /usr/include/glib-2.0/glib/deprecated/gthread.h:128:21: fatal error: pthread.h: No such file or directory
>>>  #include <pthread.h>
>>>                      ^
>>> compilation terminated.
>>> make[4]: *** [libcairo_gobject_la-cairo-gobject-enums.lo] Error 1
>>> make[4]: Leaving directory `/tmp/build/cairo-1.14.2/util/cairo-gobject'
>>> make[3]: *** [all-recursive] Error 1
>>> make[3]: Leaving directory `/tmp/build/cairo-1.14.2/util'
>>> make[2]: *** [all] Error 2
>>> make[2]: Leaving directory `/tmp/build/cairo-1.14.2/util'
>>> make[1]: *** [all-recursive] Error 1
>>> make[1]: Leaving directory `/tmp/build/cairo-1.14.2'
>>> make: *** [all] Error 2
>>>
>>> That is the first time I can't cross compile a library with my cross-compiler.
>>> I don't know exactly why it is looking for the "pthread.h" header because my cross-compiler is not supporting threads and because I have given the "--disable-pthread" option to the configure script.
>>>
>>> When I am looking at the /tmp/build/cairo-1.14.2/util/cairo-gobject/Makefile file where the problem is found, I see this rule:
>>> libcairo_gobject_la-cairo-gobject-enums.lo: cairo-gobject-enums.c
>>> 	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcairo_gobject_la_CFLAGS) $(CFLAGS) -MT libcairo_gobject_la-cairo-gobject-enums.lo -MD -MP -MF $(DEPDIR)/libcairo_gobject_la-cairo-gobject-enums.Tpo -c -o libcairo_gobject_la-cairo-gobject-enums.lo `test -f 'cairo-gobject-enums.c' || echo '$(srcdir)/'`cairo-gobject-enums.c
>>> 	$(AM_V_at)$(am__mv) $(DEPDIR)/libcairo_gobject_la-cairo-gobject-enums.Tpo $(DEPDIR)/libcairo_gobject_la-cairo-gobject-enums.Plo
>>>
>>> I think it is not normal that the "/usr/include/glib-2.0/glib/deprecated/gthread.h" file appears in the error message because this file is part of the headers available in my linux system.
>>> As I am cross-compiling cairo for windows, I should not see that.
>>> Maybe the problem is relative to libtool.
>>>
>>> Any idea why I got this error message please?
>>>
>>> Thank you.
>>> Best regards.
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