Build

build: Allow CFLAGS to be passed through on macos. #2907

Job	Run time
Create source package	2m 12s
Build for Ubuntu (Debug)	8m 36s
Build for macOS (x86_64, Debug)	2m 39s
Build for Ubuntu (Release)	8m 36s
Build for macOS (x86_64, Release)	3m 2s
Build for Windows (x86_64, Debug) on Ubuntu	9m 38s
Build for macOS (arm64, Debug)	3m 16s
Build for Windows (x86_64, Release) on Ubuntu	10m 43s
Build for macOS (arm64, Release)	2m 53s
Build for Windows (aarch64, Debug) on Ubuntu	1m 43s
Build for Windows (aarch64, Release) on Ubuntu	1m 54s
Build macOS Universal Bundle (debug)	15s
Build macOS Universal Bundle (release)	14s
Generate PDB for Windows (x86_64, Debug)	31s
Generate PDB for Windows (x86_64, Release)	29s
Generate PDB for Windows (aarch64, Debug)	28s
Generate PDB for Windows (aarch64, Release)	26s
Push to PPA Snapshot Branch	24s
Release	11s
	58m 10s

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