Hi,

Giel van Schijndel <giel@mortis.eu> skribis:

> On 09-03-18 13:42, Ludovic Courtès wrote:
>> julien lepiller <julien@lepiller.eu> skribis:
>>
>>> I'm trying to build a software that requires gcc>=7.2. Unfortunately,
>>> the process crashes and ends with:
>>>
>>> /gnu/store/a4vwdk8r6p6l2mnffz4yaqlr1z6z6w3r-gcc-7.3.0/include/c++/cstdlib:75:15:
>>> fatal error: stdlib.h: No such file or directory.
>> On IRC Marius mentioned this bug report:
>>
>>   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70129#c3
>>
>> Note that we use C_INCLUDE_PATH, which is equivalent to ‘-isystem’.
>
> This is biting me too for a C++17 project I'm trying to build.

Marius, do you have a link to the exact change in GCC that caused this
regression?

I find it hard to believe that a fix would necessarily “slow everything
down”, as Jakub put it in the report above.

Also it seems clear that in Guix we’ll want a solution that’s not
CMake-specific.

Giel, does the patch below work for you?