45 lines
1.4 KiB
Markdown
45 lines
1.4 KiB
Markdown
Using ccache
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============
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[ccache](http://ccache.samba.org/manual.html) is available in many
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systems, and can dramatically improve compilation times. In particular
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if we are constantly switching between different branches.
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On Ubuntu, we can install ccache by executing
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sudo apt-get install ccache
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Using ccache with g++
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---------------------
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Then, we can create a simple script that invokes ccache with our
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favorite C++ 11 compiler. For example, we can create the script
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`~/bin/ccache-g++` with the following content:
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#!/bin/sh
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ccache g++ "$@"
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Then, we instruct cmake to use `ccache-g++` as our C++ compiler
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cmake -D CMAKE_BUILD_TYPE=Debug -D CMAKE_CXX_COMPILER=~/bin/ccache-g++ ../../src
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We usually use Ninja instead of make. Thus, our cmake command
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line is:
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cmake -D CMAKE_BUILD_TYPE=Debug -D CMAKE_CXX_COMPILER=~/bin/ccache-g++ -G Ninja ../../src
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Using ccache with clang++
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-------------------------
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To use ccache with clang++, create the script ``~/bin/ccache-clang++``
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with the following content:
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#!/bin/sh
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ccache clang++ -Qunused-arguments -fcolor-diagnostics "$@"
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- ``-Qunused-arguments`` option is used to suppress "clang: warning:
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argument unused during compilation:" warning.
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- ``-fcolor-diagnostics`` option is used to enable clang's colored
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diagnostic messages.
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Reference: http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html
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