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Note that the problem for gcc is not completely solved just by compiling gcc with tcc. To build gcc (with tcc) you need to run ./configure which depends on tr, diff, mktemp etc. All of which need to built using a C compiler on a Unix. So at some point we need to build these tools without ./configure and without a working Unix.
 
Note that the problem for gcc is not completely solved just by compiling gcc with tcc. To build gcc (with tcc) you need to run ./configure which depends on tr, diff, mktemp etc. All of which need to built using a C compiler on a Unix. So at some point we need to build these tools without ./configure and without a working Unix.
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=== Helpers ===
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Here is a helpful command to list all the binaries invoked during the build process of compiling a package:
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<pre>
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TMP=`mktemp` ; strace -o "$TMP" -f -e trace=execve -e 'signal=!all' make ; sed -ne 's/.*execve("\([^"]*\)",.*/\1/p' "$TMP" | xargs ls -d 2>/dev/null | sort | uniq
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</pre>
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Example: [[Binutils Build Inputs]]

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