[Interest] Fwd: Defining a string in qmake command line

[Thiago Macieira]

On quinta-feira, 23 de janeiro de 2014 23:05:26, Soroush Rabiei wrote:
> The problem is that bash (or qmake) eats the double quotation. Definition
> needs to be wrapped in quotations. So it should pass to compiler something
> like:
> 
> -DSERIAL\"6b6ab0\"

You have to work back from what you want. You want a compiler argument 
containing the string:

	-DSERIAL="6b6ab0"

Since Make runs commands using the shell, you need to add one level of 
escaping so the shell will do what you want:

	-DSERIAL=\"6b6ab0\"

Testing:
$ make -f /dev/stdin <<<'all:
        /bin/echo -DSERIAL=\"6b6ab0\"
'
/bin/echo -DSERIAL=\"6b6ab0\"
-DSERIAL="6b6ab0"

Now, qmake also processes backslashes, so you need to escape one more level: 
to get one backslash in the Makefile, you need to write two. And you need one 
more for the quote.

	DEFINES += SERIAL=\\\"6b6ab0\\\"

Testing:
$ qmake /dev/stdin -o /dev/stdout <<<'DEFINES += SERIAL=\\\"6b6ab0\\\"' | grep 
SERIAL
DEFINES       = -DSERIAL=\"6b6ab0\" -DQT_GUI_LIB -DQT_CORE_LIB

Now, you wanted to pass that to qmake on the command-line, so you need to add 
yet another level of escaping, by doubling each slash and adding one more:

	DEFINES+=SERIAL=\\\\\\\"6b6ab0\\\\\\\"

Testing:
$ qmake /dev/null -o /dev/stdout DEFINES+=SERIAL=\\\\\\\"6b6ab0\\\\\\\" | grep 
SERIAL
# Command: /home/thiago/obj/qt/qt5/qtbase/bin/qmake 
DEFINES+=SERIAL=\\\6b6ab0\\\ -o . /dev/null
DEFINES       = -DSERIAL=\"6b6ab0\" -DQT_GUI_LIB -DQT_CORE_LIB
        $(QMAKE) DEFINES+=SERIAL=\\\6b6ab0\\\ /dev/null
        @$(QMAKE) DEFINES+=SERIAL=\\\6b6ab0\\\ /dev/null

Note that the DEFINES variable is correct in the Makefile, but the command for 
qmake to rerun itself is not. That's an apparent qmake bug.

PS: don't try this with spaces. You need $$quote for that.
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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