compilation

问题 cat main.c #include <stdio.h> #include <stdlib.h> #include <linux/ext2_fs.h> int main(int argc, char** argv) { return (EXIT_SUCCESS); } Here is my output... gcc main.c In file included from main.c:3: /usr/include/linux/ext2_fs.h: In function ‘ext2_mask_flags’: /usr/include/linux/ext2_fs.h:182: error: ‘FS_DIRSYNC_FL’ undeclared (first use in this function) /usr/include/linux/ext2_fs.h:182: error: (Each undeclared identifier is reported only once /usr/include/linux/ext2_fs.h:182: error: for

问题 I'm trying to understand how does golang's garbage collector work when the golang code is compiled and I guess when using go run as well. I figure go run is a little more straight forward and just runs the garbage collector along with the .go files you are running. But is the garbage collector compiled into the binaries as well when compiling to an executable? 回答1: The compiled object files do not contain any garbage collector "code". When a program is run with go run , the go command will

问题 I have problem compiling Zabbix 5.2 configured this way: # ./configure --enable-server --enable-agent --with-net-snmp --with-libcurl --with-libxml2 --with-postgresql --with-prefix=/usr/local/zabbix5 --verbose ... checking for PostgreSQL libraries... yes checking if PostgreSQL version is >= 9.2... yes checking for Zabbix server/proxy database selection... ok checking for multirow insert statements... yes checking for pkg-config... no checking for pkg-config... no configure: error: LIBXML2

问题 I have problem compiling Zabbix 5.2 configured this way: # ./configure --enable-server --enable-agent --with-net-snmp --with-libcurl --with-libxml2 --with-postgresql --with-prefix=/usr/local/zabbix5 --verbose ... checking for PostgreSQL libraries... yes checking if PostgreSQL version is >= 9.2... yes checking for Zabbix server/proxy database selection... ok checking for multirow insert statements... yes checking for pkg-config... no checking for pkg-config... no configure: error: LIBXML2

问题 I have configured Java, Eclipse and Selenium to be used for automating a web based application. But, I am facing below mentioned issues: Issue 1: Warning : Build path specifies execution environment JavaSE-14. There are no JREs installed in the workspace that are strictly compatible with this environment. Issue 2: Unable to access objects of selenium in the code. Issue 3: Getting the below mentioned compilation error: Exception in thread "main" java.lang.Error: Unresolved compilation problems

问题 I have configured Java, Eclipse and Selenium to be used for automating a web based application. But, I am facing below mentioned issues: Issue 1: Warning : Build path specifies execution environment JavaSE-14. There are no JREs installed in the workspace that are strictly compatible with this environment. Issue 2: Unable to access objects of selenium in the code. Issue 3: Getting the below mentioned compilation error: Exception in thread "main" java.lang.Error: Unresolved compilation problems

问题 We currently have code compiled in Java 8 but we are running that on Java 11 VM. Now we are trying to move our code to Java 11 compile time as well. Wondering if there are any benefits to compiled code in Java 8 vs Compiled code in Java 11 performance-wise, since both compilers will produce different class files (bytecode)? How does one differ from the other in terms of efficiency? 回答1: javac is not an optimizing compiler, so in general, don't expect it to produce "faster" bytecode from

问题 We currently have code compiled in Java 8 but we are running that on Java 11 VM. Now we are trying to move our code to Java 11 compile time as well. Wondering if there are any benefits to compiled code in Java 8 vs Compiled code in Java 11 performance-wise, since both compilers will produce different class files (bytecode)? How does one differ from the other in terms of efficiency? 回答1: javac is not an optimizing compiler, so in general, don't expect it to produce "faster" bytecode from

问题 I'm having problems with MSVS compiler, I have the following code: if (!list) { *type = raw_data[*i++]; ptr = (char*) &size; ptr[1] = raw_data[*i++]; ptr[0] = raw_data[*i++]; name = new char[size+1]; memcpy (name, raw_data+*i, size); name[size] = '\0'; *i += size; } And later: if (!list) { s->name = name; s->name_size = size; } The value of list doesn't change in this function, however I can't compile the code because of this error: Error 1 error C4703: potentially uninitialized local pointer

问题 I'm having problems with MSVS compiler, I have the following code: if (!list) { *type = raw_data[*i++]; ptr = (char*) &size; ptr[1] = raw_data[*i++]; ptr[0] = raw_data[*i++]; name = new char[size+1]; memcpy (name, raw_data+*i, size); name[size] = '\0'; *i += size; } And later: if (!list) { s->name = name; s->name_size = size; } The value of list doesn't change in this function, however I can't compile the code because of this error: Error 1 error C4703: potentially uninitialized local pointer