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Environment Variables

DCR_COMPILER​

Overrides the compiler for all languages. Highest priority.

export DCR_COMPILER=clang
dcr build

Compiler resolution priority:

  1. DCR_COMPILER (env)
  2. DCR_CC / DCR_CXX / DCR_AS (env)
  3. [toolchain] (dcr.toml)
  4. build.compiler (dcr.toml)
  5. PATH

DCR_CC / DCR_CXX / DCR_AS​

Per-language override (lower priority than DCR_COMPILER, higher than [toolchain]).

export DCR_CC=gcc-14
export DCR_CXX=g++-14
export DCR_AS=arm-linux-gnueabihf-as

DCR_LD / DCR_AR​

Override linker and archiver.

export DCR_LD=ld.lld
export DCR_AR=llvm-ar

DCR_DEBUG​

Enables debug mode — prints all compilation commands to stderr before execution.

export DCR_DEBUG=1
dcr build

DCR_INDEX_PATH​

Overrides the path to the registry index.json.

export DCR_INDEX_PATH=/custom/path/index.json

Default: ~/.dcr/index.json.

DCRUP_MIRROR​

Download mirror for dcrup (prebuilt binaries only).

export DCRUP_MIRROR=auto   # cf → gh → sf → ya (default)
export DCRUP_MIRROR=cf     # CloudFlare CDN
export DCRUP_MIRROR=gh     # GitHub Releases
export DCRUP_MIRROR=sf     # SourceForge
export DCRUP_MIRROR=ya     # Yandex CDN (RU fallback)

CLI override: dcrup install stable --mirror cf.

DCRUP_HOME / DCRUP_BIN / DCRUP_REPO​

Installer layout and source clone URL:

export DCRUP_HOME=~/.dcr
export DCRUP_BIN=~/.dcr/bin
export DCRUP_REPO=https://github.com/dexoron/dcr