RFA: 8031668: TOOLCHAIN_FIND_COMPILER unexpectedly resolves symbolic links AND 8148351: Only display resolved symlink for compiler, do not change path

[Severin Gehwolf]

Hi,

Please approve these two backports to JDK 8u-dev which are already in
JDK 9 and better.

8031668: TOOLCHAIN_FIND_COMPILER unexpectedly resolves symbolic links
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8031668/webrev.01/
hg export: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8031668/JDK-8031668.jdk8.export.patch

8148351: Only display resolved symlink for compiler, do not change path
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8148351/webrev.01/
hg export: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8148351/JDK-8148351.jdk8.export.patch

Bug 8031668 is a dependency for 8148351 which actually fixes the
wrapped compiler issue on the JDK 8 tree. The JDK 8 patch of 8031668 is
the same as for JDK 9, modulo some context changes. After the JDK 8
patch of 8031668, the JDK 9 patch of 8148351 imports as is.

The issue at hand is that one cannot build the JDK 8 tree with certain
compiler wrappers such as cscppc. It currently fails with:

configure: Using default toolchain gcc (GNU Compiler Collection)
checking for gcc... /usr/lib64/cscppc/gcc
checking resolved symbolic links for CC... /usr/bin/cscppc
checking if CC is disguised ccache... no, keeping CC
configure: The C compiler (located as /usr/bin/cscppc) does not seem to be the required gcc compiler.
configure: The result from running with --version was: ""
configure: error: A gcc compiler is required. Try setting --with-tools-dir.
configure exiting with result code 1

After both backports configure with a wrapped GCC succeeds.

Please note that I'd need an Oracle sponsor for getting this pushed to
jdk8u-dev since both changes require re-generation of generated-
configure.sh

Thanks,
Severin