Linux

fix specs_prefix_format to point to root toolchain's directory #126

Job	Run time
cache-maker	11s
release-linux (./.github/do-linux)	2h 2m 8s
minsize-linux (./.github/do-linux)	1h 58m 31s
release-linux (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=tr...	1h 39m 19s
minsize-linux (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=tr...	1h 36m 9s
cmake-linux (./.github/do-cmake-linux -DCMAKE_BUILD_TYPE=RelWithDebInfo)	10m 1s
release-linux (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-ma...	1h 58m 18s
minsize-linux (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-ma...	1h 52m 14s
minsize-linux (-Dtinystdio=false, ./.github/do-linux)	1h 12m 16s
release-linux (-Dtinystdio=false, ./.github/do-linux)	1h 18m 50s
cmake-linux (./.github/do-cmake-linux -DCMAKE_BUILD_TYPE=MinSizeRel)	9m 58s
minsize-linux (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=true...	56m 17s
cmake-linux (-D__IO_FLOAT=y -D_IO_FLOAT_EXACT=n -D_WANT_IO_LONG_LONG=y -D_MB_CAPABLE=y -D_WANT_IO...	9m 44s
release-linux (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=true...	57m 46s
cmake-linux (-D__IO_FLOAT=y -D_IO_FLOAT_EXACT=n -D_WANT_IO_LONG_LONG=y -D_MB_CAPABLE=y -D_WANT_IO...	9m 52s
	16h 11m 34s

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