gcc：错误：在 MacOSX 上构建 openjdk9 时'-mstack-alignment=16'无法识别的命令行选项

Question

我想构建JDK9，但是我遇到了以下问题。我正在使用OSX El Capitan上的GCC＆amp; G 版本5.3.0（Homebrew GCC 5.3.0）。我也尝试使用4.9.3，但仍然相同。

这是我解决问题的方式：

➜openjdk9 bash ./configure --enable-native-coverage --with-toolchain-type=gcc -disable-warnings-as-errors
➜openjdk9 cd build/macosx-x86_64-normal-server-release
➜macosx-x86_64-normal-server-release make

然后我得到以下错误日志：

Building target 'default (exploded-image)' in configuration 'macosx-x86_64-normal-server-release'
Building JVM variant 'server' with features 'all-gcs cds compiler1 compiler2 dtrace fprof jni-check jvmci jvmti management nmt services vm-structs'
Compiling 8 files for BUILD_TOOLS_LANGTOOLS
Creating adlc from 13 file(s)
Compiling 2 files for BUILD_JVMTI_TOOLS
Creating libjsig.dylib from 1 file(s)
gcc: error: unrecognized command line option '-mstack-alignment=16'
make[4]: *** [/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/build/macosx-x86_64-normal-server-release/hotspot/libjsig/objs/jsig.o] Error 1
make[3]: *** [jsig] Error 2
make[3]: *** Waiting for unfinished jobs....
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp: In constructor 'Arena::Arena(size_t)':
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:31:7: error: non-placement deallocation function 'static void Chunk::operator delete(void*, size_t)' [-fpermissive]
 void  Chunk::operator delete(void* p, size_t length) {
       ^
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:60:52: error: selected for placement delete [-fpermissive]
   _first = _chunk = new (init_size) Chunk(init_size);
                                                    ^
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp: In constructor 'Arena::Arena()':
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:31:7: error: non-placement deallocation function 'static void Chunk::operator delete(void*, size_t)' [-fpermissive]
 void  Chunk::operator delete(void* p, size_t length) {
       ^
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:67:66: error: selected for placement delete [-fpermissive]
   _first = _chunk = new (Chunk::init_size) Chunk(Chunk::init_size);
                                                                  ^
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp: In member function 'void* Arena::grow(size_t)':
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:31:7: error: non-placement deallocation function 'static void Chunk::operator delete(void*, size_t)' [-fpermissive]
 void  Chunk::operator delete(void* p, size_t length) {
       ^
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:97:31: error: selected for placement delete [-fpermissive]
   _chunk = new (len) Chunk(len);
                               ^
make[4]: *** [/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/build/macosx-x86_64-normal-server-release/hotspot/variant-server/tools/adlc/objs/arena.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [variant-server-gensrc] Error 2
make[2]: *** [hotspot] Error 1
make[2]: *** Waiting for unfinished jobs....
ERROR: Build failed for target 'default (exploded-image)' in configuration 'macosx-x86_64-normal-server-release' (exit code 2)
=== Output from failing command(s) repeated here ===
* For target hotspot_libjsig_objs_jsig.o:
gcc: error: unrecognized command line option '-mstack-alignment=16'
* For target hotspot_variant-server_tools_adlc_objs_arena.o:
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp: In constructor 'Arena::Arena(size_t)':
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:31:7: error: non-placement deallocation function 'static void Chunk::operator delete(void*, size_t)' [-fpermissive]
 void  Chunk::operator delete(void* p, size_t length) {
       ^
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:60:52: error: selected for placement delete [-fpermissive]
   _first = _chunk = new (init_size) Chunk(init_size);
                                                    ^
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp: In constructor 'Arena::Arena()':
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:31:7: error: non-placement deallocation function 'static void Chunk::operator delete(void*, size_t)' [-fpermissive]
 void  Chunk::operator delete(void* p, size_t length) {
       ^
/Users/weizhaoy/Documents/STAP/Research/jdk9/openjdk9/hotspot/src/share/vm/adlc/arena.cpp:67:66: error: selected for placement delete [-fpermissive]
   ... (rest of output omitted)
=== End of repeated output ===
No indication of failed target found.
Hint: Try searching the build log for '] Error'.
Hint: If caused by a warning, try configure --disable-warnings-as-errors.
make[1]: *** [main] Error 1
make: *** [default] Error 2

但是，当我使用--enable-debug --disable-warnings-as-errors配置和make时，没有错误。

看来它可能与--enable-native-coverage选项和-with-toolchain-type=gcc选项有关，默认情况下，工具链将是clang（但是工具链必须是gcc才能使--enable-native-coverage工作），但是我该如何解决？

Answer 1

-mstack-alignment=n是一个clang选项，而GCC未识别。相应的GCC选项是-mpreferred-stack-boundary=n。

请注意，它们不是完全同义词。对于-mstack-alignment=n，n仅仅是所需的对齐量。对于-mpreferred-stack-boundary=n，2^ n是所需的对齐量，因此：

-mstack-alignment=16    =   -mpreferred-stack-boundary=4

还请注意，n = 4是-mpreferred-stack-boundary的默认值，因此对于GCC，您可以简单地省略该选项。