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How to pass macro definition from “make” command line arguments (-D) to C source code?
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Call make command this way:
make CFLAGS=-Dvar=42
And be sure to use $(CFLAGS) in your compile command in the Makefile. As @jørgensen mentioned , putting the variable assignment after the make command will override the CFLAGS value already defined the Makefile.
Altern...
Loadbalancing web sockets
...-IP-port), it will work with TCP (and hence WebSocket).
Also note that a 64k hard limit only applies to outgoing TCP/IP for a given (source) IP address. It does not apply to incoming TCP/IP. We have tested Autobahn (a high-performance WebSocket server) with 200k active connections on a 2 core, 4GB ...
Get time difference between two dates in seconds
... or enum
– zaffaste
Mar 10 '16 at 8:41
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@Media min-width & max-width
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I've found the best method is to write your default CSS for the older browsers, as older browse...
Styling text input caret
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If you are using a webkit browser you can change the color of the caret by following the next CS...
R apply function with multiple parameters
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194
Just pass var2 as an extra argument to one of the apply functions.
mylist <- list(a=1,b=2,c=...
sql “LIKE” equivalent in django query
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204
Use __contains or __icontains (case-insensitive):
result = table.objects.filter(string__contains...
How can I use a local image as the base image with a dockerfile?
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4 Answers
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What does it mean in shell when we put a command inside dollar sign and parentheses: $(command)
...on.
– Jonathan Leffler
Aug 1 '13 at 4:03
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Technically, $(echo foo) creates a command substitutio...