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Merge #16586: doc: Mention other ways to conserve memory on compilation

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fa7789f731 doc: Mention other ways to conserve memory on compilation (MarcoFalke)

Pull request description:

  Related to:

  *  Building requires >1GB memory #6658

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fanquake 2019-08-14 12:44:27 +08:00
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doc/build-unix.md
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@ -61,6 +61,14 @@ tuned to conserve memory with additional CXXFLAGS:
./configure CXXFLAGS="--param ggc-min-expand=1 --param ggc-min-heapsize=32768"
Alternatively, or in addition, debugging information can be skipped for compilation. The default compile flags are
`-g -O2`, and can be changed with:
./configure CXXFLAGS="-O2"
Finally, clang (often less resource hungry) can be used instead of gcc, which is used by default:
./configure CXX=clang++ CC=clang
## Linux Distribution Specific Instructions