我正在尝试使用Archlinux中的gcc 7.2独立编译gcc 6.4.0。
配置如下：
SomeProc编译时，我在TFunc<Integer, Integer>中收到以下错误：
../configure --prefix=${INSTALL_PREFIX} --enable-languages=c,c++,fortran \
--enable-threads=posix --enable-tls --enable-libgomp --enable-lto \
--enable-shared --enable-static --disable-nls --disable-multilib \
--with-fpmath=sse
我比较了gcc 6.4.0和gcc 7.2.0中定义的md-unwind-support.h，发现md-unwind-support.h:65:47: error: dereferencing pointer to incomplete type 'struct ucontext'
在gcc 7.2.0中被定义为md-unwind-support.h。
所以，我在gcc 6.4.0源代码树的struct ucontext中进行了一些更改，但得到了一些命名空间问题，如下所示：
ucontext_t我陷入困境，不知道这个问题。
任何帮助和建议都会有所帮助。
答案 0 :(得分：8)
要让make工作，您必须修改文件make_folder/libgcc/config/i386/linux_unwind.h，其中make_folder是您键入make命令的文件夹。
在linux_unwind.h中，您必须将第61行的struct ucontext *uc_ = context->cfa;更改为struct ucontext_t *uc_ = context->cfa;
感谢Seong告诉我们要修改哪个文件。
答案 1 :(得分：6)
以下是一个补丁，它总结了我的所作所为。简而言之，对ucontext_t和struct sigaltstack指针的结构进行了更改，将指针指向void指针，struct sigaltstack指向stack_t。
diff -urN gcc-6.3.0/libgcc/config/i386/linux-unwind.h gcc-6.3.0.new/libgcc/config/i386/linux-unwind.h
--- gcc-6.3.0/libgcc/config/i386/linux-unwind.h 2016-01-04 23:30:50.000000000 +0900
+++ gcc-6.3.0.new/libgcc/config/i386/linux-unwind.h 2017-10-29 23:01:21.717240052 +0900
@@ -58,7 +58,7 @@
if (*(unsigned char *)(pc+0) == 0x48
&& *(unsigned long long *)(pc+1) == RT_SIGRETURN_SYSCALL)
{
- struct ucontext *uc_ = context->cfa;
+ ucontext_t *uc_ = context->cfa;
/* The void * cast is necessary to avoid an aliasing warning.
The aliasing warning is correct, but should not be a problem
because it does not alias anything. */
@@ -138,7 +138,7 @@
siginfo_t *pinfo;
void *puc;
siginfo_t info;
- struct ucontext uc;
+ ucontext_t uc;
} *rt_ = context->cfa;
/* The void * cast is necessary to avoid an aliasing warning.
The aliasing warning is correct, but should not be a problem
diff -urN gcc-6.3.0/libsanitizer/sanitizer_common/sanitizer_linux.cc gcc-6.3.0.new/libsanitizer/sanitizer_common/sanitizer_linux.cc
--- gcc-6.3.0/libsanitizer/sanitizer_common/sanitizer_linux.cc 2015-11-23 18:07:18.000000000 +0900
+++ gcc-6.3.0.new/libsanitizer/sanitizer_common/sanitizer_linux.cc 2017-10-29 23:09:00.490577558 +0900
@@ -546,8 +546,7 @@
}
#endif
-uptr internal_sigaltstack(const struct sigaltstack *ss,
- struct sigaltstack *oss) {
+uptr internal_sigaltstack(const void *ss, void *oss) {
return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss);
}
diff -urN gcc-6.3.0/libsanitizer/sanitizer_common/sanitizer_linux.h gcc-6.3.0.new/libsanitizer/sanitizer_common/sanitizer_linux.h
--- gcc-6.3.0/libsanitizer/sanitizer_common/sanitizer_linux.h 2015-10-21 16:32:45.000000000 +0900
+++ gcc-6.3.0.new/libsanitizer/sanitizer_common/sanitizer_linux.h 2017-10-29 23:09:43.907244619 +0900
@@ -19,7 +19,6 @@
#include "sanitizer_platform_limits_posix.h"
struct link_map; // Opaque type returned by dlopen().
-struct sigaltstack;
namespace __sanitizer {
// Dirent structure for getdents(). Note that this structure is different from
@@ -28,8 +27,7 @@
// Syscall wrappers.
uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
-uptr internal_sigaltstack(const struct sigaltstack* ss,
- struct sigaltstack* oss);
+uptr internal_sigaltstack(const void* ss, void* oss);
uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
__sanitizer_sigset_t *oldset);
void internal_sigfillset(__sanitizer_sigset_t *set);
diff -urN gcc-6.3.0/libsanitizer/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc gcc-6.3.0.new/libsanitizer/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc
--- gcc-6.3.0/libsanitizer/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc 2015-10-21 16:32:45.000000000 +0900
+++ gcc-6.3.0.new/libsanitizer/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc 2017-10-29 23:08:07.260577074 +0900
@@ -267,7 +267,7 @@
// Alternate stack for signal handling.
InternalScopedBuffer<char> handler_stack_memory(kHandlerStackSize);
- struct sigaltstack handler_stack;
+ stack_t handler_stack;
internal_memset(&handler_stack, 0, sizeof(handler_stack));
handler_stack.ss_sp = handler_stack_memory.data();
handler_stack.ss_size = kHandlerStackSize;
diff -urN gcc-6.3.0/libsanitizer/tsan/tsan_platform_linux.cc gcc-6.3.0.new/libsanitizer/tsan/tsan_platform_linux.cc
--- gcc-6.3.0/libsanitizer/tsan/tsan_platform_linux.cc 2016-08-12 17:53:46.000000000 +0900
+++ gcc-6.3.0.new/libsanitizer/tsan/tsan_platform_linux.cc 2017-10-29 23:10:38.817245120 +0900
@@ -291,7 +291,7 @@
int ExtractResolvFDs(void *state, int *fds, int nfd) {
#if SANITIZER_LINUX
int cnt = 0;
- __res_state *statp = (__res_state*)state;
+ struct __res_state *statp = (struct __res_state*)state;
for (int i = 0; i < MAXNS && cnt < nfd; i++) {
if (statp->_u._ext.nsaddrs[i] && statp->_u._ext.nssocks[i] != -1)
fds[cnt++] = statp->_u._ext.nssocks[i];
答案 2 :(得分：3)
我终于解决了问题。
我应该修改libgcc/config/i386/linux_unwind.h而不是直接修改md-unwind-support.h