GNU bug report logs - #30756
GCC >= 6 '-isystem' and C_INCLUDE_PATH behavior changed, breaking #include_next

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From: ludo <at> gnu.org (Ludovic Courtès)
To: Mark H Weaver <mhw <at> netris.org>
Cc: 30756 <at> debbugs.gnu.org, Giel van Schijndel <giel <at> mortis.eu>
Subject: bug#30756: gcc7 doesn't find stdlib.h
Date: Fri, 04 May 2018 22:39:46 +0200

Mark H Weaver <mhw <at> netris.org> skribis:

> On my own private branch, I worked around this problem by adding
> "-idirafter <LIBC>/include" to CXXFLAGS, but of course it's not a proper
> fix.  My workaround happens to be in Savannah on the
> 'reproduce-bug-29774' branch:
>
>   https://git.savannah.gnu.org/cgit/guix.git/commit/?h=reproduce-bug-29774&id=87022e2666c5e68e865eb160a4bd8e9cdcc1a955

Perhaps we could achieve the same effect by adding “-idirafter
LIBC/include” to the default spec file, under ‘cpp_options’?
(We’d achieve that by modifying the value of ‘cpp_options’ in
gcc/gcc.c.)

I suppose that would fix the include_next issue that Giel describes?

Ludo’.

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