2008/11/26 Kelly O'Hair <[EMAIL PROTECTED]>: > If you set the variable WARNINGS_ARE_ERRORS to be empty, it should > be sent through to all the makefiles. It's the variable > WARNINGS_ARE_ERRORS that contains the option "-Werror" for hotspot > compiles, and it is -Werror that makes warnings fatal. > > So try: > > make WARNINGS_ARE_ERRORS= > > Not using -Werror all the time will likely let more warning errors creep > into the > builds, but using it means a few people get annoyed when diffenent compilers > get used. > > But keeping all warning messages out of the build is a very good thing in > my view. > We need to figure out how to get these warnings fixed in the code, and > not create new warnings on other platforms or with other compilers. > Sometimes that is easy, sometimes it is not. > > -kto > > > Douglas Felt wrote: >> >> 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 >> >> >> >
Apparently, these warnings arise from a patch backported to gcc 4.3 from 4.4 in the Ubuntu build (according to Matthias Klose, GCJ/IcedTea maintainer for Ubuntu). So this problem will arise more and more once 4.4 is released. -- Andrew :-) Support Free Java! Contribute to GNU Classpath and the OpenJDK http://www.gnu.org/software/classpath http://openjdk.java.net PGP Key: 94EFD9D8 (http://subkeys.pgp.net) Fingerprint: F8EF F1EA 401E 2E60 15FA 7927 142C 2591 94EF D9D8
