Issue in Toolchain

### Page link:

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### Problem description (include actual vs expected text, if applicable):

I am encountering an issue with toolchain where it fails to correctly pick the specified compiler path within the provided tool path. Instead, it picks the default '/usr/bin/gcc' for it's compilation.

Error:
gcc failed: error executing CppCompile command /usr/bin/gcc -U_FORTIFY_SOURCE -fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer '-std=c++14' -MD -MF

Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
gcc: error: unrecognized command line option '-std=c++14'.

### Where do you see this issue? (include link to specific section of the page, if applicable)

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### Any other information you'd like to share?

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Start by reproducing the toolchain configuration that invokes the CppCompile command, then run with --sandbox_debug to inspect the sandbox build root and compiler selection. Trace why the specified tool path resolves to /usr/bin/gcc; done means the configured compiler path is used and the compilation no longer fails on -std=c++14.

Written by the indexing model from the issue text.