Sorry that there are many similar questions, but I do find that Googling for CMake queries always yields similar-but-not-the-same scenarios, conflicting CMake commands and so on! I need to force my project to build 32-bit binaries because I have to link with a library which is only available as 32-bit. I diagnosed this based on … Read more
This question already has answers here: Joining pandas DataFrames by Column names (2 answers) Closed 18 days ago. According to this documentation I can only make a join between fields having the same name. Do you know if it’s possible to join two DataFrames on a field having different names? The equivalent in SQL would … Read more
This question already has answers here: What is the most appropriate data type for storing an IP address in SQL server? [duplicate] (13 answers) Closed 7 years ago. what is the right field type for IP address in mysql? and what is the right way of storing it using PHP? Answer This tutorial might help … Read more
I have installed boost on Fedora 20 via yum and am trying some simple examples. However I have trouble to compile the first example from the logging tutorial. Compiling with g++ -c boosttest.cc works fine, but I get lot’s of errors when I try to link it with g++ boosttest.o -o boosttest -lboost_log -lpthread the … Read more
I’ve got this model: class Visit(models.Model): timestamp = models.DateTimeField(editable=False) ip_address = models.IPAddressField(editable=False) If a user visits multiple times in one day, how can I filter for unique rows based on the ip field? (I want the unique visits for today) today = datetime.datetime.today() yesterday = datetime.datetime.today() – datetime.timedelta(days=1) visits = Visit.objects.filter(timestamp__range=(yesterday, today)) #.something? EDIT: I … Read more
What is the usage of the -I and -L flags in a makefile? Answer These are typically part of the linker command line, and are either supplied directly in a target action, or more commonly assigned to a make variable that will be expanded to form link command. In that case: -L is the path … Read more
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 7 years ago. Improve this question When have you ever personally come upon the halting problem in the field? This can be … Read more
I have a django project with a database table that already contains data. I’d like to change the field name without losing any of the data in that column. My original plan was to simply change the model field name in a way that would not actually alter the name of the db table (using … Read more
When I try to build the following program: #include <stdio.h> int main(void) { printf(“hello world\n”); return 0; } On OS X 10.6.4, with the following flags: gcc -static -o blah blah.c It returns this: ld: library not found for -lcrt0.o collect2: ld returned 1 exit status Has anyone else encountered this, or is it something … Read more
I set the CFLAGS in CMake by CMAKE_C_FLAGS. Is something like this to set LDFLAGS? Answer It depends a bit on what you want: A) If you want to specify which libraries to link to, you can use find_library to find libs and then use link_directories and target_link_libraries to. Of course, it is often worth … Read more
