Why Does Disabling CGO Slow Down Go Compilation Even Without Using C Bindings?

Why Compiling with CGO_ENABLED=0 Incurred Slowdown

Despite not utilizing C bindings, compiling with CGO_ENABLED=0 noticeably slows down compilation. To understand its cause, we must delve into the mechanisms at play.

The standard library packages are built using predetermined compilation flags. When CGO_ENABLED is set to 0, the build flags are modified, rendering the pre-built packages incompatible. Consequently, the majority of the standard library must be rebuilt.

Although "go build -i" can install packages built with the new flags, it does not entirely resolve the issue. Installing packages built with CGO_ENABLED=0 accelerates future builds with the same flag, but hinders builds without it.

The default installation method for pre-built packages is inefficient, with all packages being stored in the same directory with identical names regardless of their build configurations. To enable fast builds with varying flags, "go build -i" should be combined with "-installsuffix" or "-pkgdir" flags. By assigning a unique directory for each compilation mode, separate builds with different flags can be accommodated seamlessly.

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