{"id":137,"date":"2008-11-18T09:12:04","date_gmt":"2008-11-17T23:42:04","guid":{"rendered":"http:\/\/www.clearchain.com\/blog\/?p=137"},"modified":"2008-11-18T09:12:04","modified_gmt":"2008-11-17T23:42:04","slug":"jhbuild-just-wont-build-aka-include-path-madness","status":"publish","type":"post","link":"https:\/\/www.clearchain.com\/blog\/posts\/jhbuild-just-wont-build-aka-include-path-madness","title":{"rendered":"jhbuild just won’t build! (aka Include path madness)"},"content":{"rendered":"

I’ve been recently trying to work out why jhbuild fails to build xorg on my FreeBSD box. Traditionally I compile to \/usr\/local\/<\/em> however after wanting to experiment with MPX I’ve set things up so that I compile to\u00a0\/usr\/local\/MPX<\/em><\/p>\n

Sadly this kept breaking in xorg\/lib\/libX11 with the error:<\/p>\n

<\/p>\n

xcb_io.c: In function 'require_socket':\r\nxcb_io.c:35: warning: implicit declaration of function 'xcb_take_socket'\r\nxcb_io.c:35: warning: nested extern declaration of 'xcb_take_socket'\r\nxcb_io.c: In function 'process_responses':\r\nxcb_io.c:188: error: 'GenericEvent' undeclared (first use in this function)\r\nxcb_io.c:188: error: (Each undeclared identifier is reported only once\r\nxcb_io.c:188: error: for each function it appears in.)\r\nxcb_io.c:189: error: 'xcb_ge_event_t' undeclared (first use in this function)\r\nxcb_io.c:189: error: expected expression before ')' token\r\nxcb_io.c:193: error: expected expression before ')' token\r\nxcb_io.c: In function '_XSend':\r\nxcb_io.c:332: warning: implicit declaration of function 'xcb_writev'\r\nxcb_io.c:332: warning: nested extern declaration of 'xcb_writev'<\/pre>\n
\u00a0<\/p>\n
For the life of me I couldn’t make sense of it. GenericEvent is defined in xcb\/xcb.h and checking the preprocessor output xcb.h was being included. Likewise the lack of xcb_ge_event_t was baffling me as it was certain in xcb\/xcb.h. It wasn’t till I looked a little closer that I realised that the wrong xcb.h was being used. Turns out that \/usr\/local\/include\/xcb\/xcb.h<\/em> was being used however I wanted \/usr\/local\/MPX\/include\/xcb\/xcb.h<\/em> to be used. Hence I tried adding -I\/usr\/local\/MPX<\/em> to CFLAGS with no success and also tried setting CC=”gcc -I\/usr\/local\/MPX”<\/em> also with no success. It just didn’t make sense!<\/p>\n
Looking at the gcc line, \/u<\/em>sr\/local\/MPX<\/em> should have been used first. It wasn’t until I finally check the preprocessor what it thought the system paths were did it all make sense.<\/p>\n
The output from cpp is below:<\/p>\n
U<\/span>sing built-in specs.\r\nTarget: amd64-undermydesk-freebsd\r\nConfigured with: FreeBSD\/amd64 system compiler\r\nThread model: posix\r\ngcc version 4.2.1 20070719 \u00a0[FreeBSD]\r\n\u00a0\/usr\/libexec\/cc1 -E -quiet -v -I. -I..\/include\/X11 -I..\/include -I..\/include\/X11\r\n-I..\/include -I..\/include\/X11 -I..\/src\/xcms -I..\/src\/xkb -I..\/src\/xlibi18n -I\/usr\/local\/include\u00a0\r\n-D_LONGLONG -DHAVE_CONFIG_H -D_BSD_SOURCE -DHAS_FCHOWN -DHAS_STICKY_DIR_BIT -D_THREAD_SAFE -D_BSD_SOURCE\r\n-DX11_t -DTRANS_CLIENT -isystem \/usr\/local\/MPX\/include xcb_io.c -o xcb_io.lo -Wall -Wpointer-arith\r\n-Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -fno-strict-aliasing -fworking-directory -O0<\/pre>\n
ignoring duplicate directory \"\/usr\/local\/MPX\/include\"\r\nignoring duplicate directory \"\/usr\/include\"\r\nignoring duplicate directory \"..\/include\/X11\"\r\nignoring duplicate directory \"..\/include\"\r\nignoring duplicate directory \"..\/include\/X11\"\r\n#include \"...\" search starts here:\r\n#include <...> search starts here:\r\n\u00a0.\r\n\u00a0..\/include\/X11\r\n\u00a0..\/include\r\n\u00a0..\/src\/xcms\r\n\u00a0..\/src\/xkb\r\n\u00a0..\/src\/xlibi18n\r\n\u00a0\/usr\/local\/include\r\n\u00a0\/usr\/local\/MPX\/include\r\n\u00a0\/usr\/include\r\nEnd of search list.<\/pre>\n
It turns out that jhbuild sets the environment variable C_INCLUDE_PATH, <\/em>in this case to \/usr\/local\/MPX\/include<\/em>. This variable adds a library to the system search path. Whilst it prepends to the system search path, \u00a0-I\u00a0<\/em>options prepend the system search path, hence with one -I option being \/usr\/local\/include<\/em>, we get the ordering incorrect and the wrong header is used. \u00a0<\/p>\n
So now it was up to working out why \/usr\/local\/include<\/em> was needed. Searching config.log it turns out the bigfontproto was needed by libX11, pkg_config was searching for it and finding it not in \/usr\/local\/MPX\/lib\/share\/pkg_config<\/em> but in \/usr\/local\/lib\/share\/pkg_config<\/em>. The reason for this is bigfontproto wasn’t listed as a dependancy in the xorg.modules file used by jhbuild (avaliable at:http:\/\/cgit.freedesktop.org\/xorg\/util\/modular\/tree\/xorg.modules<\/a>). Because of this bigfont proto wasn’t being built by jhbuild<\/a>. Hence the only bigfontproto that existed on the box was the default system bigfont proto which WAS located under \/usr\/local\/include.\u00a0<\/p>\n
The fix was simple. List xf86bigfontproto as a dependency in xorg.modules and all was good. bigfontproto is now pulled in as a dependency and hence gets built before libX11. pkg_config now correctly finds bigfontproto in \/usr\/local\/MPX\/lib\/share\/pkg_config<\/em> hence doesn’t need to fallback to the system version so -I\/usr\/local\/include<\/em> doesn’t get added to the gcc line. Hence the compiler uses \/usr\/local\/MPX\/include\/xcb\/xcb.h <\/em>rather than the one in \/usr\/local\/include\/xcb\/xcb.h<\/em>\u00a0and the compiler errors vanish.<\/p>\n
So now things are building and I’m off for a coffee!
\n(xorg.modules has also been correctly updated so some other poor person doesn’t have the same issues).<\/p>\n","protected":false},"excerpt":{"rendered":"
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