I'm running into multiple errors trying to build openjdk 7 on ubuntu 8.10. I downloaded the sources from http://www.java.net/download/openjdk/jdk7/promoted/b40/openjdk-7-ea-src-b40-20_nov_2008.zip as listed on http://download.java.net/openjdk/jdk7/.
The problem appears to be that gcc flags are configured to map warnings to errors, and gcc 4.3 is issuing some warnings in some of the hotspot files. here's a sample (as I worked around one, I hit another, and another): -------- cc1plus: warnings being treated as errors /home/dougfelt/openjdk/bootstrap7/hotspot/src/share/vm/classfile/javaClasses.cpp: In static member function 'static char* java_lang_Throwable::print_stack_element_to_buffer(methodOopDesc*, int)': /home/dougfelt/openjdk/bootstrap7/hotspot/src/share/vm/classfile/javaClasses.cpp:869: error: format '%#x' expects type 'unsigned int', but argument 3 has type 'nmethod*' make[6]: *** [javaClasses.o] Error 1 [...] -------- cc1plus: warnings being treated as errors /home/dougfelt/openjdk/bootstrap7/hotspot/src/share/vm/prims/jvm.cpp: In function 'void jio_print(const char*)': /home/dougfelt/openjdk/bootstrap7/hotspot/src/share/vm/prims/jvm.cpp:2477: error: ignoring return value of 'ssize_t write(int, const void*, size_t)', declared with attribute warn_unused_result make[6]: *** [jvm.o] Error 1 [...] -------- cc1plus: warnings being treated as errors /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp: In static member function 'static void os::Linux::capture_initial_stack(size_t)': /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:1189: error: format '%lu' expects type 'long unsigned int*', but argument 22 has type 'uintptr_t*' /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:1189: error: format '%lu' expects type 'long unsigned int*', but argument 23 has type 'uintptr_t*' /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:1189: error: format '%ld' expects type 'long int*', but argument 24 has type 'uintptr_t*' /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:1189: error: format '%lu' expects type 'long unsigned int*', but argument 26 has type 'uintptr_t*' /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:1189: error: format '%lu' expects type 'long unsigned int*', but argument 27 has type 'uintptr_t*' /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:1189: error: format '%lu' expects type 'long unsigned int*', but argument 28 has type 'uintptr_t*' /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp: In static member function 'static void os::jvm_path(char*, jint)': /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:2027: error: ignoring return value of 'char* realpath(const char*, char*)', declared with attribute warn_unused_result /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:2051: error: ignoring return value of 'char* realpath(const char*, char*)', declared with attribute warn_unused_result /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:2062: error: ignoring return value of 'char* realpath(const char*, char*)', declared with attribute warn_unused_result /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp: In function 'jlong slow_thread_cpu_time(Thread*, bool)': /home/dougfelt/openjdk/bootstrap7/hotspot/src/os/linux/vm/os_linux.cpp:4157: error: format '%c' expects type 'char*', but argument 3 has type 'int*' make[6]: *** [os_linux.o] Error 1 -------- cc1plus: warnings being treated as errors /home/dougfelt/openjdk/bootstrap7/hotspot/src/share/vm/utilities/ostream.cpp: In member function 'virtual void fileStream::write(const char*, size_t)': /home/dougfelt/openjdk/bootstrap7/hotspot/src/share/vm/utilities/ostream.cpp:303: error: ignoring return value of 'size_t fwrite(const void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result /home/dougfelt/openjdk/bootstrap7/hotspot/src/share/vm/utilities/ostream.cpp: In member function 'virtual void fdStream::write(const char*, size_t)': /home/dougfelt/openjdk/bootstrap7/hotspot/src/share/vm/utilities/ostream.cpp:331: error: ignoring return value of 'ssize_t write(int, const void*, size_t)', declared with attribute warn_unused_result -------- Is my version of gcc too new? The information on http://hg.openjdk.java.net/jdk7/build/raw-file/tip/README-builds.html is only current as of ubuntu 7.10, and mentions older versions of some packages. Is there a more recent list of build tools for ubuntu? gcc-4.3 seems to be an indirect dependency of eclipse. It's not clear if i can downrev it to 4.1 and use the debian eclipse install. Anyway, what should I do? Doug
