On Darwin `oil` fails to build with an error that is just a warning when
building and installing it with the official instructions at
https://www.oilshell.org/release/0.19.0/doc/INSTALL.html
This commit therefore adds something to NIX_CFLAGS_COMPILE to turn the
error into a warning.
OpenBSD believes that PowerPC should be always-big-endian; this
assumption seems to have propagated into recent releases of
libressl. Since libressl is aliased to many other packages
(e.g. netcat) it's important to fail early here, otherwise it's very
difficult to figure out why libressl is getting dragged into a
failing build.
According to the WebAssembly design doc, wasm32 is an ILP32 ABI like
x32, mips64n32, and aarch64_ilp32 (Apple Watch). This commits adds
it to the predicate.
1319968ca5/CAndC%2B%2B.md (L16)
The commit prior to this one, "gcc: fix c++ headers when same
triplet cross compiling" causes gcc's c++ headers to be in the same
outpath subdirectory regardless of whether the gcc build is a
host==target or host!=target compiler.
As a result of that change, the hack in cc-wrapper which adapted to
the different paths is no longer needed. And, in fact, it must be
removed, since if it is left in place builds such as
pkgsCross.aarch64-multiplatform.firefox will fail as shown below.
```
firefox-unwrapped> 0:02.01(B checking the host C compiler works... yes(B(B
firefox-unwrapped> 0:02.01(B checking for the host C++ compiler... /nix/store/1asqji9djmdlapzs70q7jw2j308ry7cn-clang-wrapper-16.0.6/bin/c++(B(B
firefox-unwrapped> 0:02.14(B checking whether the host C++ compiler can be used... yes(B(B
firefox-unwrapped> 0:02.14(B checking the host C++ compiler version... 16.0.6(B(B
firefox-unwrapped> 0:02.21(B checking the host C++ compiler works... yes(B(B
firefox-unwrapped> 0:02.40(B checking for target linker... lld(B(B
firefox-unwrapped> 0:02.51(B checking for host linker... lld(B(B
firefox-unwrapped> 0:02.60(B checking for 64-bit OS... yes(B(B
firefox-unwrapped> 0:02.67(B checking for new enough STL headers from libstdc++...(B(B
firefox-unwrapped> 0:02.67(B DEBUG: <truncated - see config.log for full output>(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | #if defined(__GLIBCXX__) && !defined(_GLIBCXX_RELEASE)(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | # error libstdc++ not new enough(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | #endif(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | #if defined(_GLIBCXX_RELEASE)(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | # if _GLIBCXX_RELEASE < 8(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | # error libstdc++ not new enough(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | # else(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | (void) 0(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | # endif(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | #endif(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | ;(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | return 0;(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | }(B(B
firefox-unwrapped> 0:02.67(B DEBUG: Executing: `/nix/store/7v4bi4q334yircaznwm353h1l5i7k98f-aarch64-unknown-linux-gnu-clang-wrapper-16.0.6/bin/aarch64-unknown-linux-gnu-clang++ /build/conftest.qvbo58dv.cpp -c`(B(B
firefox-unwrapped> 0:02.67(B DEBUG: The command returned non-zero exit status 1.(B(B
firefox-unwrapped> 0:02.67(B DEBUG: Its error output was:(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | /build/conftest.qvbo58dv.cpp:1:10: fatal error: 'cstddef' file not found(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | #include <cstddef>(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | ^~~~~~~~~(B(B
firefox-unwrapped> 0:02.67(B DEBUG: | 1 error generated.(B(B
firefox-unwrapped> 0:02.67(B ERROR: The libstdc++ in use is not new enough. Please run ./mach bootstrap to update your compiler, or update your system libstdc++ installation.(B(B
firefox-unwrapped> *** Fix above errors and then restart with "./mach build"
error: build of '/nix/store/5in7xkji5hzqkl14ygwq3vxnni54lykk-firefox-unwrapped-aarch64-unknown-linux-gnu-119.0.1.drv' on 'ssh://root@192.168.22.103' failed: builder for '/nix/store/5in7xkji5hzqkl14ygwq3vxnni54lykk-firefox-unwrapped-aarch64-unknown-linux-gnu-119.0.1.drv' failed with exit code 1
error: builder for '/nix/store/5in7xkji5hzqkl14ygwq3vxnni54lykk-firefox-unwrapped-aarch64-unknown-linux-gnu-119.0.1.drv' failed with exit code 1;
```
When build platform and host platform differ, but have the same
triple, the code in nixpkgs will consider it a cross compilation,
but gcc won't. This will lead some derivations to look for c++
headers in the wrong place. To solve this always output the headers
in the non-cross location, like we do for the other gcc headers
already.
