46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
dnl
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dnl This ugly hack is needed because the Cygnus configure script won't
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dnl tell us what CC is going to be, and "cc" isn't always right. (The
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dnl top-level Makefile will always override anything we choose here, so
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dnl the usual gcc/cc selection is useless.)
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dnl
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dnl It knows where it is in the tree; don't try using it elsewhere.
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dnl
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undefine([AC_PROG_CC])dnl
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AC_DEFUN(AC_PROG_CC,
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[AC_BEFORE([$0], [AC_PROG_CPP])dnl
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dnl
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dnl The ugly bit...
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dnl
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AC_MSG_CHECKING([for CC])
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dnl Don't bother with cache.
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test -z "$CC" && CC=`egrep '^CC *=' ../Makefile | tail -1 | sed 's/^CC *= *//'`
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test -z "$CC" && CC=cc
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AC_MSG_RESULT(setting CC to $CC)
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AC_SUBST(CC)
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dnl
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dnl Find out if we are using GNU C, under whatever name.
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dnl The semicolon is to pacify NeXT's syntax-checking cpp.
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cat > conftest.c <<EOF
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#ifdef __GNUC__
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yes;
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#endif
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EOF
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if ${CC-cc} -E conftest.c 2>&AC_FD_CC | egrep yes >/dev/null 2>&1; then
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GCC=yes
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if test "${CFLAGS+set}" != set; then
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echo 'void f(){}' > conftest.c
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if test -z "`${CC-cc} -g -c conftest.c 2>&1`"; then
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CFLAGS="-g -O"
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else
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CFLAGS="-O"
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fi
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fi
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else
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GCC=
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test "${CFLAGS+set}" = set || CFLAGS="-g"
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fi
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rm -f conftest*
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])dnl
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dnl
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