configure.in
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上传日期:2007-01-08
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文件大小:10k
- dnl This file in input to autoconf. It consists of a series of m4
- dnl macros which expand to produce the shell script "configure".
- dnl Anything which is not an m4 macro is copied directly to the output.
- dnl
- dnl Start things up. If the specified file doesn't exist, configure
- dnl will complain.
- AC_INIT(lbn16.c)
- dnl The following tests need to know that we intend to produce a config.h
- dnl file, even though this won't expand to any shell script code until
- dnl AC_OUTPUT time. Name it config.hin to avoid MS-LOSS.
- AC_CONFIG_HEADER(config.h:config.hin)
- dnl Checks for programs.
- # Find a compiler to use.
- # Check 1) The $CC environment varaible, 2) gcc, 3) acc, and 4) cc.
- dnl This used to be just AC-CHECK-PROGS(CC, gcc acc, cc), but...
- # This deals with brain-damaged Sun systems that place a bogus cc or
- # acc executable in the $PATH, which just prints an error and exit.
- # We deal with this by actually trying to compile a trivial test program.
- if eval "test "`echo '$''{'ac_cv_prog_CC'+set}'`" = set"; then
- AC_MSG_CHECKING(For C compiler (cached))
- CC="$ac_cv_prog_CC"
- AC_MSG_RESULT($CC)
- elif test -n "$CC"; then
- ac_cv_prog_CC="$CC" # Let the user override the test.
- AC_MSG_CHECKING(For C compiler)
- AC_MSG_RESULT($CC)
- else
- IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:"
- echo 'main(){return 0;}' > conftest.$ac_ext
- for ac_prog in gcc acc cc; do
- # Extract the first word of "$ac_prog", so it can be a program name with args.
- set dummy $ac_prog; ac_word=$2
- AC_MSG_CHECKING(for $ac_word)
- for ac_dir in $PATH; do
- test -z "$ac_dir" && ac_dir=.
- if test -x "$ac_dir/$ac_word"; then
- CC="$ac_prog"
- if eval $ac_compile; then
- ac_cv_prog_CC="$ac_prog"
- fi
- break
- fi
- done
- CC="$ac_cv_prog_CC"
- if test -n "$CC"; then
- AC_MSG_RESULT($ac_dir/$CC)
- break;
- fi
- AC_MSG_RESULT(no)
- done
- if test ! -n "$CC"; then
- AC_MSG_ERROR(no C compiler found)
- fi
- IFS="$ac_save_ifs"
- rm -f conftest*
- fi
- AC_SUBST(CC)
- AC_CACHE_CHECK(whether we are using GNU CC, ac_cv_prog_gcc,
- [dnl The semicolon is to pacify NeXT's syntax-checking cpp.
- cat > conftest.c <<EOF
- #ifdef __GNUC__
- yes;
- #endif
- EOF
- if ${CC-cc} -E conftest.c 2>&AC_FD_CC | egrep yes >/dev/null 2>&1; then
- ac_cv_prog_gcc=yes
- else
- ac_cv_prog_gcc=no
- fi])
- if test $ac_cv_prog_gcc = yes; then
- if test "${CFLAGS+set}" != set; then
- AC_CACHE_CHECK(whether ${CC-cc} accepts -g, ac_cv_prog_gcc_g,
- [echo 'void f(){}' > conftest.c
- if test -z "`${CC-cc} -g -c conftest.c 2>&1`"; then
- ac_cv_prog_gcc_g=yes
- else
- ac_cv_prog_gcc_g=no
- fi
- rm -f conftest*
- ])
- fi
- # If we're using GCC, perform some Deep Magic to enable the result to
- # link cleanly with code compiled with a compiler that doesn't understand
- # GCC's support library (-lgcc). Do a link, to relocatable object form,
- # with just -lgcc. If it's not GCC, do the normal -c thing.
- # These substitutions are used in the Makefile to force that behaviour.
- GCCMAGIC1='-Wl,-r -nostdlib'
- GCCMAGIC2=-lgcc
- else
- GCCMAGIC1=-c
- GCCMAGIC2=
- fi
- AC_SUBST(GCCMAGIC1)
- AC_SUBST(GCCMAGIC2)
- # Now, figure out the CFLAGS we want. If the user didn't *ask*
- # for CFLAGS, we're going to use some ideas of our own.
- if test "$(CFLAGS+set)" != set; then
- # First, remember one useful thing that was just figured out,
- # namely whether the compiler can take -g with -O. (Most compilers
- # seem to do the opposite of what I want here - if you give both, -g
- # overrides and disables optimization.) This is only done for
- # gcc at the moment, and the no/yes combination is possible but
- # misleading
- if test $ac_cv_prog_gcc$ac_cv_prog_gcc_g = yesyes; then
- CFLAGS=-g
- else
- CFLAGS=""
- fi
- # Now, the whole raison d'e^tre of this library is that it's *fast*.
- # So we are *not* happy with autoconf's normal conservative compilation
- # flags. Try to figure out what kind the compiler we're using and soup
- # things up a bit. Also turn on warnings if possible.
- # If it's GCC, crank up optimization to -O6, and try to add some
- # -m options, too.
- # Otherwise, it gets even more ad-hoc, but the test below works for the
- # SunPro C compiler and cranks it up to maximum optimization.
- dnl
- dnl Note that the situation here is actually *worse* than the usual
- dnl CPU-COMPANY-SYSTEM system type can detect, because it depends on
- dnl the C compiler. For example, all of the options below (as of the
- dnl time this is written) are available on a single machine!
- dnl Using compiler-specific checks rather than config.guess seems
- dnl entirely appropriate here.
- AC_MSG_CHECKING(for useful tuning options ($TUNE))
- if test $ac_cv_prog_gcc = yes; then
- : ${WARN="-Wall -W -Wshadow -Wpointer-arith -Wmissing-prototypes -Wwrite-strings"}
- if test "${TUNE+set}" != set; then
- TUNE=-O6
- case `$CC -v 2>&1` in
- *gcc-lib/sparc-*)
- # Try to use the architecture-detecting tool with SunPro CC.
- if bn_tune=`(fpversion -foption) 2>/dev/null`; then
- if test "$bn_tune" = xcg92 || test "$bn_tune" = cg92; then
- TUNE="$TUNE -mv8"
- elif test "$bn_tune" != xcg89 && test "$bn_tune" != cg89; then
- TUNE="$TUNE -mv8"
- bn_tune_guess=yes
- fi
- else
- TUNE="$TUNE -mv8"
- bn_tune_guess=yes
- fi
- esac
- fi
- elif $CC -flags 2>&1 | grep SunSoft >/dev/null 2>&1; then
- if test "${WARN+set}" != set; then
- if $CC -flags 2>&1 | grep 'checking' | grep '^-vc' > /dev/null 2>&1; then
- WARN=-vc
- elif $CC -flags 2>&1 | grep 'checking' | grep '^-v ' > /dev/null 2>&1; then
- WARN=-v
- fi
- if $CC -flags 2>&1 | grep '^-xstrconst' > /dev/null 2>&1; then
- WARN="${WARN}${WARN+ }-xstrconst"
- fi
- fi
- # SunPro C compiler - now grok version and platform
- if test "${TUNE+set}" != set; then
- if $CC -flags 2>&1 | grep '^-xO.*5' >/dev/null 2>&1; then
- TUNE=-xO5
- else
- TUNE=-xO4
- fi
- # Architecture: -native iv avail., else as fpversion says, else guess -mv8
- if $CC -flags 2>&1 | grep '^-native' >/dev/null 2>&1; then
- TUNE="$TUNE -native"
- elif bn_tune=`(fpversion -foption) 2>/dev/null`; then
- TUNE="$TUNE -$bn_tune"
- elif $CC -flags 2>&1 | grep '^-xcg92' >/dev/null 2>&1; then
- TUNE="$TUNE -xcg92"
- bn_tune_guess=yes
- fi
- fi
- fi
- bn_tune_set=${TUNE+set}
- # If nothing better is available, turn on -O
- : ${TUNE=-O}
- AC_MSG_RESULT(${TUNE-none})
- if test "$bn_tune_set" != set; then
- AC_MSG_WARN(not optimizing heavily - try setting $CFLAGS)
- elif test "$bn_tune_guess" = yes; then
- AC_MSG_WARN([architecture guessed. If incorrect, use explicit $TUNE.])
- fi
- AC_MSG_CHECKING(for useful warning options ($WARN))
- AC_MSG_RESULT(${WARN-none})
- fi
- # ^^ End of "$(CFLAGS+set)" != set condition
- AC_SUBST(TUNE)
- AC_SUBST(WARN)
- # Find "ranlib". Sone systems don't have or need ranlib. If so,
- # ":" (do nothing) is used instead.
- AC_PROG_RANLIB
- dnl Checks for libraries.
- dnl (we don't have any)
- dnl Checks for header files.
- AC_HEADER_STDC
- if test $ac_cv_header_stdc = yes; then
- AC_DEFINE(HAVE_ASSERT_H)
- AC_DEFINE(HAVE_LIMITS_H)
- AC_DEFINE(HAVE_STDLIB_H)
- AC_DEFINE(HAVE_STRING_H)
- else # If non-ANSI, check for other brokenness.
- AC_CHECK_HEADERS(assert.h limits.h stdlib.h string.h)
- # Do we want to include memory.h?
- if test $ac_cv_header_string_h = no; then
- AC_CHECK_HEADERS(strings.h)
- ac_found=no
- else
- AC_MSG_CHECKING(whether string.h declares mem functions)
- AC_EGREP_HEADER(memset, string.h, ac_found=yes, ac_found=no)
- AC_MSG_RESULT($ac_found)
- fi
- # ac_found is now "yes" if string.h exists and declares the mem*
- # functions. If not, see if memory.h exists and include that
- # as well.
- if test $ac_found = no; then
- AC_CHECK_HEADER(memory,h. [AC_DEFINE(NEED_MEMORY_H)])
- fi
- AC_CACHE_CHECK(whether <stdio.h> provides prototypes,
- bn_cv_header_stdio_protos,
- [AC_EGREP_HEADER(printf, stdio.h, bn_cv_header_stdio_protos=yes, bn_cv_header_stdio_protos=no)
- ])
- if test $bn_cv_header_stdio_protos = no; then
- AC_DEFINE(NO_STDIO_PROTOS)
- fi
- fi
- # ^^ End of non-ANSI header brokenness tests (first part)
- AC_CACHE_CHECK(whether <string.h> declares mem* wrong.,
- bn_cv_header_mem_broken,
- [AC_EGREP_HEADER(memcpy.*char, string.h, bn_cv_header_mem_broken=yes, bn_cv_header_mem_broken=no)
- ])
- if test $bn_cv_header_mem_broken = yes; then
- AC_DEFINE(MEM_PROTOS_BROKEN)
- fi
- # SunOS 4.1.x acc's <assert.h> is broken
- AC_CACHE_CHECK(whether <assert.h> is broken and needs <stdio.h>,
- bn_cv_header_assert_needs_stdio,
- [AC_EGREP_CPP(stderr,
- [#include <assert.h>
- assert(foo)
- ], bn_cv_header_assert_needs_stdio=yes, bn_cv_header_assert_needs_stdio=no)
- ])
- if test $bn_cv_header_assert_needs_stdio = yes; then
- AC_DEFINE(ASSERT_NEEDS_STDIO)
- fi
- AC_CACHE_CHECK(whether <assert.h> is broken and needs <stdlib.h>,
- bn_cv_header_assert_needs_stdlib,
- [AC_EGREP_CPP(exit,
- [#include <assert.h>
- assert(foo)
- ], bn_cv_header_assert_needs_stdlib=yes, bn_cv_header_assert_needs_stdlib=no)
- ])
- if test $bn_cv_header_assert_needs_stdlib = yes; then
- AC_DEFINE(ASSERT_NEEDS_STDLIB)
- fi
- # Check that we have <sys/time.h> explicitly.
- AC_CHECK_HEADERS(sys/time.h)
- AC_HEADER_TIME
- dnl Checks for typedefs, structures, and compiler characteristics.
- # Verify that the compiler supports const, and that it works.
- # A number of compilers sort of support const, but they have bugs
- # that will prevent valid programs from compiling.
- AC_C_CONST
- # See if we have size_t. (If not, define it as unsigned.)
- AC_TYPE_SIZE_T
- dnl Checks for library functions.
- AC_CHECK_FUNCS(clock_gettime gethrvtime getrusage)
- dnl The following are for real-time clocks only as of yet.
- dnl AC_CHECK_FUNCS(clock_getres gethrtime gettimeofday getitimer setitimer ftime)
- # If we don't have ANSI C, see if a few functions are missing that
- # we've noticed the lack of before.
- if test $ac_cv_header_stdc = yes; then
- AC_DEFINE(HAVE_CLOCK)
- AC_DEFINE(HAVE_TIME)
- AC_DEFINE(HAVE_MEMMOVE)
- AC_DEFINE(HAVE_MEMCPY)
- else
- AC_CHECK_FUNCS(clock time memmove memcpy)
- fi
- # ^^ End of non-ANSI header brokenness tests (second part)
- # The big bang! Produce the output files. This is config.cache, and
- # config.status, which builds the config.h file and a long list of
- # Makefiles.
- dnl The value specified to AC_CONFIG_HEADER at the top if the file is
- dnl used here to produce config.h.
- AC_OUTPUT(Makefile)