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configure: check if C compiler works

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Check if the C compiler works to get a useful error message when it
doesn't or it's missing. If the CC environment variable is not set, try
gcc and then cc.
This commit is contained in:
Miroslav Lichvar 2015-09-17 13:51:18 +02:00
parent 4f172f6f9f
commit 3cd32ed660
1 changed files with 29 additions and 20 deletions
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49
configure vendored
View file

@ -10,26 +10,6 @@
# This configure script determines the operating system type and version
if [ "x${CC}" = "x" ]; then
MYCC="gcc"
else
MYCC="${CC}"
fi
if [ "x${CFLAGS}" = "x" ]; then
MYCFLAGS="-O2 -g"
else
MYCFLAGS="${CFLAGS}"
fi
MYCPPFLAGS="${CPPFLAGS}"
if [ "x${MYCC}" = "xgcc" ]; then
MYCFLAGS="${MYCFLAGS} -Wmissing-prototypes -Wall"
fi
MYLDFLAGS="${LDFLAGS}"
# ======================================================================
# FUNCTIONS
@ -449,6 +429,35 @@ if [ $feat_refclock = "1" ]; then
EXTRA_OBJECTS="$EXTRA_OBJECTS refclock.o refclock_phc.o refclock_pps.o refclock_shm.o refclock_sock.o"
fi
MYCC="$CC"
MYCFLAGS="$CFLAGS"
MYCPPFLAGS="$CPPFLAGS"
MYLDFLAGS="$LDFLAGS"
if [ "x$MYCC" = "x" ]; then
MYCC=gcc
if ! test_code "$MYCC" '' '' '' ''; then
MYCC=cc
if ! test_code "$MYCC" '' '' '' ''; then
echo "error: no C compiler found"
exit 1
fi
fi
else
if ! test_code "$MYCC" '' '' '' ''; then
echo "error: C compiler $MYCC cannot create executables"
exit 1
fi
fi
if [ "x$MYCFLAGS" = "x" ]; then
MYCFLAGS="-O2 -g"
fi
if [ "x$MYCC" = "xgcc" ]; then
MYCFLAGS="$MYCFLAGS -Wmissing-prototypes -Wall"
fi
if test_code '64-bit time_t' 'time.h' '' '' '
char x[sizeof(time_t) > 4 ? 1 : -1] = {0};
return x[0];'