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

[Mats Wichmann]

On November 30, 2022 12:10:20 AM MST, Lan Yang <lanyang at autox.ai> wrote:
>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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Your approach is a valid one, but SCons does not, unfortunately support -isystem fully (issue #3064 exists to record this). You can add it directly to CCFLAGS and it should be emitted to gcc; and the MergeFlags method knows how to do this also, but - unlike for values in CPPPATH - SCons won't look in that directory for internal dependency calculation.

-- 
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