This pull request fixes the error when building embedded JavaFX for Linux. The error occurs because `MonocleGLFactory.c` does not define the macro `__USE_GNU` before including the header file `dlfcn.h`. The two lines in the conditional group "`#ifndef ANDROID`" below have no effect because the header file has already been included at that point, and the header contains include guards to ignore subsequent attempts.
MonocleGLFactory.c ... #include <EGL/egl.h> #include "eglUtils.h" #include "../PrismES2Defs.h" #include "com_sun_prism_es2_MonocleGLContext.h" #ifndef ANDROID #define __USE_GNU #include <dlfcn.h> #endif ... The `-H` option of `gcc` prints the name of each header file used. Its output shows that `egl.h` ends up including `dlfcn.h` indirectly, but without the required macro definition. $ grep -e 'EGL/egl.h' -e 'eglUtils.h' -e 'dlfcn.h' headers.log . opt/vc/include/EGL/egl.h ...... usr/include/dlfcn.h ....... usr/include/arm-linux-gnueabihf/bits/dlfcn.h . monocle/eglUtils.h For the proposed fix, I referred to the page of the *Linux Programmer's Manual* at "`man dlsym`" which states, "The `_GNU_SOURCE` feature test macro must be defined in order to obtain the definitions of `RTLD_DEFAULT` and `RTLD_NEXT` from `<dlfcn.h>`." I also used information in the following two Stack Overflow conversations: * ['RTLD_NEXT' undeclared][1] * [_GNU_SOURCE and __USE_GNU][2] [1]: https://stackoverflow.com/q/1777397 [2]: https://stackoverflow.com/q/7296963 ------------- Commit messages: - 8256012: Fix build of Monocle for Linux Changes: https://git.openjdk.java.net/jfx/pull/350/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=350&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8256012 Stats: 9 lines in 1 file changed: 3 ins; 6 del; 0 mod Patch: https://git.openjdk.java.net/jfx/pull/350.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/350/head:pull/350 PR: https://git.openjdk.java.net/jfx/pull/350
