Raise clearer error if -Doption is invalid.
Raise clearer error if -Doption is invalid.

aaronp24/meson,ernestask/meson,trhd/meson,MathieuDuponchelle/meson,MathieuDuponchelle/meson,aaronp24/meson,MathieuDuponchelle/meson,pexip/meson,becm/meson,rhd/meson,ernestask/meson,pexip/meson,QuLogic/meson,ernestask/meson,MathieuDuponchelle/meson,fmuellner/meson,becm/meson,mesonbuild/meson,becm/meson,rhd/meson,ernestask/meson,aaronp24/meson,mesonbuild/meson,ernestask/meson,wberrier/meson,MathieuDuponchelle/meson,thiblahute/meson,thiblahute/meson,ernestask/meson,thiblahute/meson,mesonbuild/meson,fmuellner/meson,QuLogic/meson,becm/meson,rhd/meson,aaronp24/meson,MathieuDuponchelle/meson,thiblahute/meson,aaronp24/meson,jpakkane/meson,jpakkane/meson,pexip/meson,MathieuDuponchelle/meson,becm/meson,trhd/meson,mesonbuild/meson,wberrier/meson,thiblahute/meson,jeandet/meson,mesonbuild/meson,wberrier/meson,trhd/meson,jeandet/meson,fmuellner/meson,wberrier/meson,jpakkane/meson,becm/meson,becm/meson,MathieuDuponchelle/meson,trhd/meson,mesonbuild/meson,QuLogic/meson,ernestask/meson,jpakkane/meson,QuLogic/meson,aaronp24/meson,fmuellner/meson,aaronp24/meson,aaronp24/meson,QuLogic/meson,pexip/meson,thiblahute/meson,jeandet/meson,jeandet/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,thiblahute/meson,ernestask/meson,fmuellner/meson,jeandet/meson,rhd/meson,fmuellner/meson,trhd/meson,pexip/meson,jpakkane/meson,becm/meson,trhd/meson,pexip/meson,wberrier/meson,fmuellner/meson,QuLogic/meson,jeandet/meson,fmuellner/meson,pexip/meson,jeandet/meson,rhd/meson,pexip/meson,rhd/meson,QuLogic/meson,jeandet/meson,MathieuDuponchelle/meson,aaronp24/meson,jpakkane/meson,mesonbuild/meson,trhd/meson,fmuellner/meson,mesonbuild/meson,wberrier/meson,mesonbuild/meson,thiblahute/meson,becm/meson,jpakkane/meson,jpakkane/meson,rhd/meson,trhd/meson,becm/meson,trhd/meson,thiblahute/meson,QuLogic/meson,ernestask/meson,wberrier/meson,pexip/meson,rhd/meson,jeandet/meson,wberrier/meson,pexip/meson