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>
Tue, 20 May 2014 21:58:25 +0000 (17:58 -0400)
commitdf70eae24aecc7538e9b6a1189e9362c8a95d77d
treef8dadd637a9730dc88b797344e56fcdac6bbe872
parent45619f5c2309246ef9eac99f4ef01aea23f52ea7
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.

(cherry picked from commit 8945667fadc2eb71b7924bb4c5a69507fd362f4a)
configure