add configure check for working compiler
authorRich Felker <dalias@aerifal.cx>
Mon, 12 May 2014 18:22:57 +0000 (14:22 -0400)
committerRich Felker <dalias@aerifal.cx>
Mon, 12 May 2014 18:22:57 +0000 (14:22 -0400)
commit8945667fadc2eb71b7924bb4c5a69507fd362f4a
tree5b8d888279344404e86caffe5b0483396c46ab0e
parentac0acd569e01735fc6052d43fdf57f3a07c93f3d
add configure check for working compiler

without this, broken choices of CC/CPPFLAGS/CFLAGS don't show up until
late in the configure process where they are confusingly reported as a
different failure such as incorrect long double type.
configure