[Scons-users] How to use -isystem instead of -I to include directories of third-party projects in scons?

[Lan Yang]

Hi scons users,

1. My question is:
how to use -isystem instead of -I to include directories of third-party
projects in scons?

2. Question's background:
Recently, I found that by adding -Wall and -Wextra to CFLAGS can raise the
compilation warning level.
And this exposes some hidden bugs.

But I do not wish to edit the warnings in the 3rd party code.
So I found a gcc's solution in stack-overflow:
https://stackoverflow.com/questions/15053776/how-do-you-disable-the-unused-variable-warnings-coming-out-of-gcc-in-3rd-party-c

The top solution recommends me keeping the warning on, but use -isystem
instead of -I to include directories of third-party projects.
Then I used the "scons --verbose" and found that the scons used "-I" by
default.

Best regards,
Lan

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