Porting nghttp2 to QNX

The nghttp2 is a widely used HTTP/2 library and was initially designed for Linux-based systems. To port it to QNX, several modifications are necessary: 

CMake configuration adjustments

Modify the tests/CMakeLists.txt file to include QNX-specific build instructions:

if(QNX)
  add_executable(main ${MAIN_SOURCES})
else()
  add_executable(main EXCLUDE_FROM_ALL ${MAIN_SOURCES})
endif()

This change ensures that the test suite is correctly built when targeting QNX. 

Codebase-level changes

  1. Added #ifdef __QNX__ blocks in source files to include QNX-specific headers like <sys/time.h>, which are not always present in Linux code.

  2. Ensure compatibility with QNX toolchains that might lack GNU-specific extensions or macros:

    #if defined(__QNX__)
  #include <sys/time.h>
#endif

    This modification ensures that QNX-specific headers are included only when compiling QNX, preventing potential compilation errors on other platforms.

    For more information, visit "Including QNX OS-specific code" in the Programmer's Guide.

Build system changes

  1. Use a custom build script to:

    1. Define QNX-specific compiler flags (e.g., QCC, CPPFLAGS, LDFLAGS).

    2. Set environment variables to guide the QNX toolchain (cross compilation).

For more information, refer to the nghttp2 repo on GitHub.

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