How to fix ccache error when building OpenJDK from source

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When compiling OpenJDK from source and have ccache enabled, we might get the following error:

configure: Using default toolchain gcc (GNU Compiler Collection)
checking for gcc... /usr/lib64/ccache/gcc
checking resolved symbolic links for CC... /usr/bin/ccache
configure: Please use --enable-ccache instead of providing a wrapped compiler.
configure: error: /usr/lib64/ccache/gcc is a symbolic link to ccache. This is not supported.
configure exiting with result code 1

This usually happens when the gcc found in your PATH is not the actual GCC binary, but a ccache wrapper:

$ which gcc
/usr/lib64/ccache/gcc

$ ll /usr/lib64/ccache/gcc
lrwxrwxrwx. 1 root root 16 May 12 15:27 /usr/lib64/ccache/gcc -> ../../bin/ccache

In this case, /usr/lib64/ccache/gcc is a symbolic link to the ccache executable. OpenJDK’s build system does not support passing a wrapped compiler directly.

A possible solution to this without manipulating the system files is to set the CC and CXX env variables with the right location for the C/C++ binaries:

bash configure \
  CC=/usr/bin/gcc \
  CXX=/usr/bin/g++ \
  --with-boot-jdk=$JAVA_HOME \
  --with-jtreg=$JTREG_HOME

Furthermore, we can also enable ccache with the --enable-ccache in combination with the CC and CXX env variables:

bash configure \
  CC=/usr/bin/gcc \
  CXX=/usr/bin/g++ \
  --enable-ccache \
  --with-boot-jdk=$JAVA_HOME \
  --with-jtreg=$JTREG_HOME

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