[Bug ld/13557] Undef. ref. err. when linking with slim LTO obj. in static lib. (mingw32 target)

[lrn1986 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13557

--- Comment #13 from LRN <lrn1986 at gmail dot com> ---
Probably unrelated: initially lto-wrapper (ran by gcc when linking main.exe)
bailed with error "lto-wrapper: CreateProcess: No such file or directory".
This is because lto-wrapper tries to spawn a "gcc" process (likely taken from
$COLLECT_GCC), and it only searches in PATH (and maybe the directory where
lto-wrapper is located, but gcc.exe isn't there).

I fixed this by adding the bin directory (where gcc.exe is) to the PATH. This
directory is *usually* in PATH (for obvious reasons) but i don't remember this
being a strict requirement, and everything works just fine unless LTO is
involved.

This hasn't been mentioned so far, so here it is, for completeness' sake.

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