The proper way of forcing a 32-bit compile using CMake

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

Pandas: join DataFrames on field with different names? [duplicate]

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

IP address storing in MySQL database using PHP [duplicate]

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

linker error while linking boost log tutorial (undefined references)

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

Get distinct values of Queryset by field

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 difference between -I and -L in makefile?

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

When have you come upon the halting problem in the field? [closed]

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

ld: library not found for -lcrt0.o on OSX 10.6 with gcc/clang -static flag

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