Actually build libc++ and libc++abi with -std=c++20

build/config/compiler/ adds the flag to cflags_cc, so this
config here must do that too. Else the -std=c++20 will show up
on the commandline _before_ the -std=c++17 added by
build/config/compiler:compiler, rendering it ineffective.

Bug: 1298070
Change-Id: I145b04aeef1003620594a0be8f74bb7731797069
Commit-Queue: Nico Weber <>
Auto-Submit: Nico Weber <>
Reviewed-by: Arthur Eubanks <>
Commit-Queue: Arthur Eubanks <>
Cr-Commit-Position: refs/heads/main@{#972250}
GitOrigin-RevId: d95d20a3f7cc630e324e706c0a2bd405792283c4
1 file changed