dnl Copyright (c) 1995, 1996, 1997, 1998 dnl The Regents of the University of California. All rights reserved. dnl dnl Redistribution and use in source and binary forms, with or without dnl modification, are permitted provided that: (1) source code distributions dnl retain the above copyright notice and this paragraph in its entirety, (2) dnl distributions including binary code include the above copyright notice and dnl this paragraph in its entirety in the documentation or other materials dnl provided with the distribution, and (3) all advertising materials mentioning dnl features or use of this software display the following acknowledgement: dnl ``This product includes software developed by the University of California, dnl Lawrence Berkeley Laboratory and its contributors.'' Neither the name of dnl the University nor the names of its contributors may be used to endorse dnl or promote products derived from this software without specific prior dnl written permission. dnl THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED dnl WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF dnl MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. dnl dnl LBL autoconf macros dnl dnl dnl Do whatever AC_LBL_C_INIT work is necessary before using AC_PROG_CC. dnl dnl It appears that newer versions of autoconf (2.64 and later) will, dnl if you use AC_TRY_COMPILE in a macro, stick AC_PROG_CC at the dnl beginning of the macro, even if the macro itself calls AC_PROG_CC. dnl See the "Prerequisite Macros" and "Expanded Before Required" sections dnl in the Autoconf documentation. dnl dnl This causes a steaming heap of fail in our case, as we were, in dnl AC_LBL_C_INIT, doing the tests we now do in AC_LBL_C_INIT_BEFORE_CC, dnl calling AC_PROG_CC, and then doing the tests we now do in dnl AC_LBL_C_INIT. Now, we run AC_LBL_C_INIT_BEFORE_CC, AC_PROG_CC, dnl and AC_LBL_C_INIT at the top level. dnl AC_DEFUN(AC_LBL_C_INIT_BEFORE_CC, [ AC_BEFORE([$0], [AC_LBL_C_INIT]) AC_BEFORE([$0], [AC_PROG_CC]) AC_BEFORE([$0], [AC_LBL_FIXINCLUDES]) AC_BEFORE([$0], [AC_LBL_DEVEL]) AC_ARG_WITH(gcc, [ --without-gcc don't use gcc]) $1="" if test "${srcdir}" != "." ; then $1="-I\$(srcdir)" fi if test "${CFLAGS+set}" = set; then LBL_CFLAGS="$CFLAGS" fi if test -z "$CC" ; then case "$host_os" in bsdi*) AC_CHECK_PROG(SHLICC2, shlicc2, yes, no) if test $SHLICC2 = yes ; then CC=shlicc2 export CC fi ;; esac fi if test -z "$CC" -a "$with_gcc" = no ; then CC=cc export CC fi ]) dnl dnl Determine which compiler we're using (cc or gcc) dnl If using gcc, determine the version number dnl If using cc: dnl require that it support ansi prototypes dnl use -O (AC_PROG_CC will use -g -O2 on gcc, so we don't need to dnl do that ourselves for gcc) dnl add -g flags, as appropriate dnl explicitly specify /usr/local/include dnl dnl NOTE WELL: with newer versions of autoconf, "gcc" means any compiler dnl that defines __GNUC__, which means clang, for example, counts as "gcc". dnl dnl usage: dnl dnl AC_LBL_C_INIT(copt, incls) dnl dnl results: dnl dnl $1 (copt set) dnl $2 (incls set) dnl CC dnl LDFLAGS dnl LBL_CFLAGS dnl AC_DEFUN(AC_LBL_C_INIT, [ AC_BEFORE([$0], [AC_LBL_FIXINCLUDES]) AC_BEFORE([$0], [AC_LBL_DEVEL]) AC_BEFORE([$0], [AC_LBL_SHLIBS_INIT]) if test "$GCC" = yes ; then # # -Werror forces warnings to be errors. # ac_lbl_cc_force_warning_errors=-Werror # # Try to have the compiler default to hiding symbols, # so that only symbols explicitly exported with # PCAP_API will be visible outside (shared) libraries. # AC_LBL_CHECK_COMPILER_OPT($1, -fvisibility=hidden) else $2="$$2 -I/usr/local/include" LDFLAGS="$LDFLAGS -L/usr/local/lib" case "$host_os" in darwin*) # # This is assumed either to be GCC or clang, both # of which use -Werror to force warnings to be errors. # ac_lbl_cc_force_warning_errors=-Werror # # Try to have the compiler default to hiding symbols, # so that only symbols explicitly exported with # PCAP_API will be visible outside (shared) libraries. # AC_LBL_CHECK_COMPILER_OPT($1, -fvisibility=hidden) ;; hpux*) # # HP C, which is what we presume we're using, doesn't # exit with a non-zero exit status if we hand it an # invalid -W flag, can't be forced to do so even with # +We, and doesn't handle GCC-style -W flags, so we # don't want to try using GCC-style -W flags. # ac_lbl_cc_dont_try_gcc_dashW=yes ;; irix*) # # MIPS C, which is what we presume we're using, doesn't # necessarily exit with a non-zero exit status if we # hand it an invalid -W flag, can't be forced to do # so, and doesn't handle GCC-style -W flags, so we # don't want to try using GCC-style -W flags. # ac_lbl_cc_dont_try_gcc_dashW=yes # # It also, apparently, defaults to "char" being # unsigned, unlike most other C implementations; # I suppose we could say "signed char" whenever # we want to guarantee a signed "char", but let's # just force signed chars. # # -xansi is normally the default, but the # configure script was setting it; perhaps -cckr # was the default in the Old Days. (Then again, # that would probably be for backwards compatibility # in the days when ANSI C was Shiny and New, i.e. # 1989 and the early '90's, so maybe we can just # drop support for those compilers.) # # -g is equivalent to -g2, which turns off # optimization; we choose -g3, which generates # debugging information but doesn't turn off # optimization (even if the optimization would # cause inaccuracies in debugging). # $1="$$1 -xansi -signed -g3" ;; osf*) # # Presumed to be DEC OSF/1, Digital UNIX, or # Tru64 UNIX. # # The DEC C compiler, which is what we presume we're # using, doesn't exit with a non-zero exit status if we # hand it an invalid -W flag, can't be forced to do # so, and doesn't handle GCC-style -W flags, so we # don't want to try using GCC-style -W flags. # ac_lbl_cc_dont_try_gcc_dashW=yes # # -g is equivalent to -g2, which turns off # optimization; we choose -g3, which generates # debugging information but doesn't turn off # optimization (even if the optimization would # cause inaccuracies in debugging). # $1="$$1 -g3" ;; solaris*) # # Assumed to be Sun C, which requires -errwarn to force # warnings to be treated as errors. # ac_lbl_cc_force_warning_errors=-errwarn # # Try to have the compiler default to hiding symbols, # so that only symbols explicitly exported with # PCAP_API will be visible outside (shared) libraries. # AC_LBL_CHECK_COMPILER_OPT($1, -xldscope=hidden) ;; ultrix*) AC_MSG_CHECKING(that Ultrix $CC hacks const in prototypes) AC_CACHE_VAL(ac_cv_lbl_cc_const_proto, AC_TRY_COMPILE( [#include <sys/types.h>], [struct a { int b; }; void c(const struct a *)], ac_cv_lbl_cc_const_proto=yes, ac_cv_lbl_cc_const_proto=no)) AC_MSG_RESULT($ac_cv_lbl_cc_const_proto) if test $ac_cv_lbl_cc_const_proto = no ; then AC_DEFINE(const,[], [to handle Ultrix compilers that don't support const in prototypes]) fi ;; esac $1="$$1 -O" fi ]) dnl dnl Check whether, if you pass an unknown warning option to the dnl compiler, it fails or just prints a warning message and succeeds. dnl Set ac_lbl_unknown_warning_option_error to the appropriate flag dnl to force an error if it would otherwise just print a warning message dnl and succeed. dnl AC_DEFUN(AC_LBL_CHECK_UNKNOWN_WARNING_OPTION_ERROR, [ AC_MSG_CHECKING([whether the compiler fails when given an unknown warning option]) save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -Wxyzzy-this-will-never-succeed-xyzzy" AC_TRY_COMPILE( [], [return 0], [ AC_MSG_RESULT([no]) # # We're assuming this is clang, where # -Werror=unknown-warning-option is the appropriate # option to force the compiler to fail. # ac_lbl_unknown_warning_option_error="-Werror=unknown-warning-option" ], [ AC_MSG_RESULT([yes]) ]) CFLAGS="$save_CFLAGS" ]) dnl dnl Check whether the compiler option specified as the second argument dnl is supported by the compiler and, if so, add it to the macro dnl specified as the first argument dnl dnl If a third argument is supplied, treat it as C code to be compiled dnl with the flag in question, and the "treat warnings as errors" flag dnl set, and don't add the flag to the first argument if the compile dnl fails; this is for warning options cause problems that can't be dnl worked around. If a third argument is supplied, a fourth argument dnl should also be supplied; it's a message desribing what the test dnl program is checking. dnl AC_DEFUN(AC_LBL_CHECK_COMPILER_OPT, [ AC_MSG_CHECKING([whether the compiler supports the $2 option]) save_CFLAGS="$CFLAGS" if expr "x$2" : "x-W.*" >/dev/null then CFLAGS="$CFLAGS $ac_lbl_unknown_warning_option_error $2" elif expr "x$2" : "x-f.*" >/dev/null then CFLAGS="$CFLAGS -Werror $2" elif expr "x$2" : "x-m.*" >/dev/null then CFLAGS="$CFLAGS -Werror $2" else CFLAGS="$CFLAGS $2" fi AC_TRY_COMPILE( [], [return 0], [ AC_MSG_RESULT([yes]) can_add_to_cflags=yes # # The compile supports this; do we have some C code for # which the warning should *not* appear? # We test the fourth argument because the third argument # could contain quotes, breaking the test. # if test "x$4" != "x" then CFLAGS="$CFLAGS $ac_lbl_cc_force_warning_errors" AC_MSG_CHECKING(whether $2 $4) AC_COMPILE_IFELSE( [AC_LANG_SOURCE($3)], [ # # Not a problem. # AC_MSG_RESULT(no) ], [ # # A problem. # AC_MSG_RESULT(yes) can_add_to_cflags=no ]) fi CFLAGS="$save_CFLAGS" if test x"$can_add_to_cflags" = "xyes" then $1="$$1 $2" fi ], [ AC_MSG_RESULT([no]) CFLAGS="$save_CFLAGS" ]) ]) dnl dnl Check whether the compiler supports an option to generate dnl Makefile-style dependency lines dnl dnl GCC uses -M for this. Non-GCC compilers that support this dnl use a variety of flags, including but not limited to -M. dnl dnl We test whether the flag in question is supported, as older dnl versions of compilers might not support it. dnl dnl We don't try all the possible flags, just in case some flag means dnl "generate dependencies" on one compiler but means something else dnl on another compiler. dnl dnl Most compilers that support this send the output to the standard dnl output by default. IBM's XLC, however, supports -M but sends dnl the output to {sourcefile-basename}.u, and AIX has no /dev/stdout dnl to work around that, so we don't bother with XLC. dnl AC_DEFUN(AC_LBL_CHECK_DEPENDENCY_GENERATION_OPT, [ AC_MSG_CHECKING([whether the compiler supports generating dependencies]) if test "$GCC" = yes ; then # # GCC, or a compiler deemed to be GCC by AC_PROG_CC (even # though it's not); we assume that, in this case, the flag # would be -M. # ac_lbl_dependency_flag="-M" else # # Not GCC or a compiler deemed to be GCC; what platform is # this? (We're assuming that if the compiler isn't GCC # it's the compiler from the vendor of the OS; that won't # necessarily be true for x86 platforms, where it might be # the Intel C compiler.) # case "$host_os" in irix*|osf*|darwin*) # # MIPS C for IRIX, DEC C, and clang all use -M. # ac_lbl_dependency_flag="-M" ;; solaris*) # # Sun C uses -xM. # ac_lbl_dependency_flag="-xM" ;; hpux*) # # HP's older C compilers don't support this. # HP's newer C compilers support this with # either +M or +Make; the older compilers # interpret +M as something completely # different, so we use +Make so we don't # think it works with the older compilers. # ac_lbl_dependency_flag="+Make" ;; *) # # Not one of the above; assume no support for # generating dependencies. # ac_lbl_dependency_flag="" ;; esac fi # # Is ac_lbl_dependency_flag defined and, if so, does the compiler # complain about it? # # Note: clang doesn't seem to exit with an error status when handed # an unknown non-warning error, even if you pass it # -Werror=unknown-warning-option. However, it always supports # -M, so the fact that this test always succeeds with clang # isn't an issue. # if test ! -z "$ac_lbl_dependency_flag"; then AC_LANG_CONFTEST( [AC_LANG_SOURCE([[int main(void) { return 0; }]])]) if AC_RUN_LOG([eval "$CC $ac_lbl_dependency_flag conftest.c >/dev/null 2>&1"]); then AC_MSG_RESULT([yes, with $ac_lbl_dependency_flag]) DEPENDENCY_CFLAG="$ac_lbl_dependency_flag" MKDEP='${srcdir}/mkdep' else AC_MSG_RESULT([no]) # # We can't run mkdep, so have "make depend" do # nothing. # MKDEP='${srcdir}/nomkdep' fi rm -rf conftest* else AC_MSG_RESULT([no]) # # We can't run mkdep, so have "make depend" do # nothing. # MKDEP='${srcdir}/nomkdep' fi AC_SUBST(DEPENDENCY_CFLAG) AC_SUBST(MKDEP) ]) dnl dnl Determine what options are needed to build a shared library dnl dnl usage: dnl dnl AC_LBL_SHLIBS_INIT dnl dnl results: dnl dnl V_SHLIB_CCOPT (modified to build position-independent code) dnl V_SHLIB_CMD dnl V_SHLIB_OPT dnl V_SONAME_OPT dnl V_RPATH_OPT dnl AC_DEFUN(AC_LBL_SHLIBS_INIT, [AC_PREREQ(2.50) if test "$GCC" = yes ; then # # On platforms where we build a shared library: # # add options to generate position-independent code, # if necessary (it's the default in AIX and Darwin/macOS); # # define option to set the soname of the shared library, # if the OS supports that; # # add options to specify, at link time, a directory to # add to the run-time search path, if that's necessary. # V_SHLIB_CMD="\$(CC)" V_SHLIB_OPT="-shared" case "$host_os" in aix*) ;; freebsd*|netbsd*|openbsd*|dragonfly*|linux*|osf*|midipix*) # # Platforms where the linker is the GNU linker # or accepts command-line arguments like # those the GNU linker accepts. # # Some instruction sets require -fPIC on some # operating systems. Check for them. If you # have a combination that requires it, add it # here. # PIC_OPT=-fpic case "$host_cpu" in sparc64*) case "$host_os" in freebsd*|openbsd*|linux*) PIC_OPT=-fPIC ;; esac ;; esac V_SHLIB_CCOPT="$V_SHLIB_CCOPT $PIC_OPT" V_SONAME_OPT="-Wl,-soname," V_RPATH_OPT="-Wl,-rpath," ;; hpux*) V_SHLIB_CCOPT="$V_SHLIB_CCOPT -fpic" # # XXX - this assumes GCC is using the HP linker, # rather than the GNU linker, and that the "+h" # option is used on all HP-UX platforms, both .sl # and .so. # V_SONAME_OPT="-Wl,+h," # # By default, directories specifed with -L # are added to the run-time search path, so # we don't add them in pcap-config. # ;; solaris*) V_SHLIB_CCOPT="$V_SHLIB_CCOPT -fpic" # # XXX - this assumes GCC is using the Sun linker, # rather than the GNU linker. # V_SONAME_OPT="-Wl,-h," V_RPATH_OPT="-Wl,-R," ;; esac else # # Set the appropriate compiler flags and, on platforms # where we build a shared library: # # add options to generate position-independent code, # if necessary (it's the default in Darwin/macOS); # # if we generate ".so" shared libraries, define the # appropriate options for building the shared library; # # add options to specify, at link time, a directory to # add to the run-time search path, if that's necessary. # # Note: spaces after V_SONAME_OPT are significant; on # some platforms the soname is passed with a GCC-like # "-Wl,-soname,{soname}" option, with the soname part # of the option, while on other platforms the C compiler # driver takes it as a regular option with the soname # following the option. The same applies to V_RPATH_OPT. # case "$host_os" in aix*) V_SHLIB_CMD="\$(CC)" V_SHLIB_OPT="-G -bnoentry -bexpall" ;; freebsd*|netbsd*|openbsd*|dragonfly*|linux*) # # "cc" is GCC. # V_SHLIB_CCOPT="$V_SHLIB_CCOPT -fpic" V_SHLIB_CMD="\$(CC)" V_SHLIB_OPT="-shared" V_SONAME_OPT="-Wl,-soname," V_RPATH_OPT="-Wl,-rpath," ;; hpux*) V_SHLIB_CCOPT="$V_SHLIB_CCOPT +z" V_SHLIB_CMD="\$(LD)" V_SHLIB_OPT="-b" V_SONAME_OPT="+h " # # By default, directories specifed with -L # are added to the run-time search path, so # we don't add them in pcap-config. # ;; osf*) # # Presumed to be DEC OSF/1, Digital UNIX, or # Tru64 UNIX. # V_SHLIB_CMD="\$(CC)" V_SHLIB_OPT="-shared" V_SONAME_OPT="-soname " V_RPATH_OPT="-rpath " ;; solaris*) V_SHLIB_CCOPT="$V_SHLIB_CCOPT -Kpic" V_SHLIB_CMD="\$(CC)" V_SHLIB_OPT="-G" V_SONAME_OPT="-h " V_RPATH_OPT="-R" ;; esac fi ]) # # Try compiling a sample of the type of code that appears in # gencode.c with "inline", "__inline__", and "__inline". # # Autoconf's AC_C_INLINE, at least in autoconf 2.13, isn't good enough, # as it just tests whether a function returning "int" can be inlined; # at least some versions of HP's C compiler can inline that, but can't # inline a function that returns a struct pointer. # # Make sure we use the V_CCOPT flags, because some of those might # disable inlining. # AC_DEFUN(AC_LBL_C_INLINE, [AC_MSG_CHECKING(for inline) save_CFLAGS="$CFLAGS" CFLAGS="$V_CCOPT" AC_CACHE_VAL(ac_cv_lbl_inline, [ ac_cv_lbl_inline="" ac_lbl_cc_inline=no for ac_lbl_inline in inline __inline__ __inline do AC_TRY_COMPILE( [#define inline $ac_lbl_inline static inline struct iltest *foo(void); struct iltest { int iltest1; int iltest2; }; static inline struct iltest * foo() { static struct iltest xxx; return &xxx; }],,ac_lbl_cc_inline=yes,) if test "$ac_lbl_cc_inline" = yes ; then break; fi done if test "$ac_lbl_cc_inline" = yes ; then ac_cv_lbl_inline=$ac_lbl_inline fi]) CFLAGS="$save_CFLAGS" if test ! -z "$ac_cv_lbl_inline" ; then AC_MSG_RESULT($ac_cv_lbl_inline) else AC_MSG_RESULT(no) fi AC_DEFINE_UNQUOTED(inline, $ac_cv_lbl_inline, [Define as token for inline if inlining supported])]) dnl dnl If using gcc, make sure we have ANSI ioctl definitions dnl dnl usage: dnl dnl AC_LBL_FIXINCLUDES dnl AC_DEFUN(AC_LBL_FIXINCLUDES, [if test "$GCC" = yes ; then AC_MSG_CHECKING(for ANSI ioctl definitions) AC_CACHE_VAL(ac_cv_lbl_gcc_fixincludes, AC_TRY_COMPILE( [/* * This generates a "duplicate case value" when fixincludes * has not be run. */ # include <sys/types.h> # include <sys/time.h> # include <sys/ioctl.h> # ifdef HAVE_SYS_IOCCOM_H # include <sys/ioccom.h> # endif], [switch (0) { case _IO('A', 1):; case _IO('B', 1):; }], ac_cv_lbl_gcc_fixincludes=yes, ac_cv_lbl_gcc_fixincludes=no)) AC_MSG_RESULT($ac_cv_lbl_gcc_fixincludes) if test $ac_cv_lbl_gcc_fixincludes = no ; then # Don't cache failure unset ac_cv_lbl_gcc_fixincludes AC_MSG_ERROR(see the INSTALL for more info) fi fi]) dnl dnl Checks to see if union wait is used with WEXITSTATUS() dnl dnl usage: dnl dnl AC_LBL_UNION_WAIT dnl dnl results: dnl dnl DECLWAITSTATUS (defined) dnl AC_DEFUN(AC_LBL_UNION_WAIT, [AC_MSG_CHECKING(if union wait is used) AC_CACHE_VAL(ac_cv_lbl_union_wait, AC_TRY_COMPILE([ # include <sys/types.h> # include <sys/wait.h>], [int status; u_int i = WEXITSTATUS(status); u_int j = waitpid(0, &status, 0);], ac_cv_lbl_union_wait=no, ac_cv_lbl_union_wait=yes)) AC_MSG_RESULT($ac_cv_lbl_union_wait) if test $ac_cv_lbl_union_wait = yes ; then AC_DEFINE(DECLWAITSTATUS,union wait,[type for wait]) else AC_DEFINE(DECLWAITSTATUS,int,[type for wait]) fi]) dnl dnl Checks to see if -R is used dnl dnl usage: dnl dnl AC_LBL_HAVE_RUN_PATH dnl dnl results: dnl dnl ac_cv_lbl_have_run_path (yes or no) dnl AC_DEFUN(AC_LBL_HAVE_RUN_PATH, [AC_MSG_CHECKING(for ${CC-cc} -R) AC_CACHE_VAL(ac_cv_lbl_have_run_path, [echo 'main(){}' > conftest.c ${CC-cc} -o conftest conftest.c -R/a1/b2/c3 >conftest.out 2>&1 if test ! -s conftest.out ; then ac_cv_lbl_have_run_path=yes else ac_cv_lbl_have_run_path=no fi rm -f -r conftest*]) AC_MSG_RESULT($ac_cv_lbl_have_run_path) ]) dnl dnl Checks to see if unaligned memory accesses fail dnl dnl usage: dnl dnl AC_LBL_UNALIGNED_ACCESS dnl dnl results: dnl dnl LBL_ALIGN (DEFINED) dnl AC_DEFUN(AC_LBL_UNALIGNED_ACCESS, [AC_MSG_CHECKING(if unaligned accesses fail) AC_CACHE_VAL(ac_cv_lbl_unaligned_fail, [case "$host_cpu" in # # These are CPU types where: # # the CPU faults on an unaligned access, but at least some # OSes that support that CPU catch the fault and simulate # the unaligned access (e.g., Alpha/{Digital,Tru64} UNIX) - # the simulation is slow, so we don't want to use it; # # the CPU, I infer (from the old # # XXX: should also check that they don't do weird things (like on arm) # # comment) doesn't fault on unaligned accesses, but doesn't # do a normal unaligned fetch, either (e.g., presumably, ARM); # # for whatever reason, the test program doesn't work # (this has been claimed to be the case for several of those # CPUs - I don't know what the problem is; the problem # was reported as "the test program dumps core" for SuperH, # but that's what the test program is *supposed* to do - # it dumps core before it writes anything, so the test # for an empty output file should find an empty output # file and conclude that unaligned accesses don't work). # # This run-time test won't work if you're cross-compiling, so # in order to support cross-compiling for a particular CPU, # we have to wire in the list of CPU types anyway, as far as # I know, so perhaps we should just have a set of CPUs on # which we know it doesn't work, a set of CPUs on which we # know it does work, and have the script just fail on other # cpu types and update it when such a failure occurs. # alpha*|arm*|bfin*|hp*|mips*|sh*|sparc*|ia64|nv1) ac_cv_lbl_unaligned_fail=yes ;; *) cat >conftest.c <<EOF # include <sys/types.h> # include <sys/wait.h> # include <stdio.h> unsigned char a[[5]] = { 1, 2, 3, 4, 5 }; main() { unsigned int i; pid_t pid; int status; /* avoid "core dumped" message */ pid = fork(); if (pid < 0) exit(2); if (pid > 0) { /* parent */ pid = waitpid(pid, &status, 0); if (pid < 0) exit(3); exit(!WIFEXITED(status)); } /* child */ i = *(unsigned int *)&a[[1]]; printf("%d\n", i); exit(0); } EOF ${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS \ conftest.c $LIBS >/dev/null 2>&1 if test ! -x conftest ; then dnl failed to compile for some reason ac_cv_lbl_unaligned_fail=yes else ./conftest >conftest.out if test ! -s conftest.out ; then ac_cv_lbl_unaligned_fail=yes else ac_cv_lbl_unaligned_fail=no fi fi rm -f -r conftest* core core.conftest ;; esac]) AC_MSG_RESULT($ac_cv_lbl_unaligned_fail) if test $ac_cv_lbl_unaligned_fail = yes ; then AC_DEFINE(LBL_ALIGN,1,[if unaligned access fails]) fi]) dnl dnl If the file .devel exists: dnl Add some warning flags if the compiler supports them dnl If an os prototype include exists, symlink os-proto.h to it dnl dnl usage: dnl dnl AC_LBL_DEVEL(copt) dnl dnl results: dnl dnl $1 (copt appended) dnl HAVE_OS_PROTO_H (defined) dnl os-proto.h (symlinked) dnl AC_DEFUN(AC_LBL_DEVEL, [rm -f os-proto.h if test "${LBL_CFLAGS+set}" = set; then $1="$$1 ${LBL_CFLAGS}" fi if test -f .devel ; then # # Skip all the warning option stuff on some compilers. # if test "$ac_lbl_cc_dont_try_gcc_dashW" != yes; then AC_LBL_CHECK_UNKNOWN_WARNING_OPTION_ERROR() AC_LBL_CHECK_COMPILER_OPT($1, -W) AC_LBL_CHECK_COMPILER_OPT($1, -Wall) AC_LBL_CHECK_COMPILER_OPT($1, -Wcomma) AC_LBL_CHECK_COMPILER_OPT($1, -Wdeclaration-after-statement) AC_LBL_CHECK_COMPILER_OPT($1, -Wdocumentation) AC_LBL_CHECK_COMPILER_OPT($1, -Wformat-nonliteral) AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-noreturn) AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-prototypes) AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-variable-declarations) AC_LBL_CHECK_COMPILER_OPT($1, -Wshadow) AC_LBL_CHECK_COMPILER_OPT($1, -Wsign-compare) AC_LBL_CHECK_COMPILER_OPT($1, -Wstrict-prototypes) AC_LBL_CHECK_COMPILER_OPT($1, -Wunused-parameter) AC_LBL_CHECK_COMPILER_OPT($1, -Wused-but-marked-unused) # Warns about safeguards added in case the enums are # extended # AC_LBL_CHECK_COMPILER_OPT($1, -Wcovered-switch-default) # # This can cause problems with ntohs(), ntohl(), # htons(), and htonl() on some platforms, such # as OpenBSD 6.3 with Clang 5.0.1. I guess the # problem is that the macro that ultimately does # the byte-swapping involves a conditional # expression that tests whether the value being # swapped is a compile-time constant or not, # using __builtin_constant_p(), and, depending # on whether it is, does a compile-time swap or # a run-time swap; perhaps the compiler always # considers one of the two results of the # conditional expressin is never evaluated, # because the conditional check is done at # compile time, and thus always says "that # expression is never executed". # # (Perhaps there should be a way of flagging # an expression that you *want* evaluated at # compile time, so that the compiler 1) warns # if it *can't* be evaluated at compile time # and 2) *doesn't* warn that the true or false # branch will never be reached.) # AC_LBL_CHECK_COMPILER_OPT($1, -Wunreachable-code, [ #include <arpa/inet.h> unsigned short testme(unsigned short a) { return ntohs(a); } ], [generates warnings from ntohs()]) fi AC_LBL_CHECK_DEPENDENCY_GENERATION_OPT() # # We used to set -n32 for IRIX 6 when not using GCC (presumed # to mean that we're using MIPS C or MIPSpro C); it specified # the "new" faster 32-bit ABI, introduced in IRIX 6.2. I'm # not sure why that would be something to do *only* with a # .devel file; why should the ABI for which we produce code # depend on .devel? # os=`echo $host_os | sed -e 's/\([[0-9]][[0-9]]*\)[[^0-9]].*$/\1/'` name="lbl/os-$os.h" if test -f $name ; then ln -s $name os-proto.h AC_DEFINE(HAVE_OS_PROTO_H, 1, [if there's an os_proto.h for this platform, to use additional prototypes]) else AC_MSG_WARN(can't find $name) fi fi]) dnl dnl Improved version of AC_CHECK_LIB dnl dnl Thanks to John Hawkinson (jhawk@mit.edu) dnl dnl usage: dnl dnl AC_LBL_CHECK_LIB(LIBRARY, FUNCTION [, ACTION-IF-FOUND [, dnl ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]]) dnl dnl results: dnl dnl LIBS dnl dnl XXX - "AC_LBL_LIBRARY_NET" was redone to use "AC_SEARCH_LIBS" dnl rather than "AC_LBL_CHECK_LIB", so this isn't used any more. dnl We keep it around for reference purposes in case it's ever dnl useful in the future. dnl define(AC_LBL_CHECK_LIB, [AC_MSG_CHECKING([for $2 in -l$1]) dnl Use a cache variable name containing the library, function dnl name, and extra libraries to link with, because the test really is dnl for library $1 defining function $2, when linked with potinal dnl library $5, not just for library $1. Separate tests with the same dnl $1 and different $2's or $5's may have different results. ac_lib_var=`echo $1['_']$2['_']$5 | sed 'y%./+- %__p__%'` AC_CACHE_VAL(ac_cv_lbl_lib_$ac_lib_var, [ac_save_LIBS="$LIBS" LIBS="-l$1 $5 $LIBS" AC_TRY_LINK(dnl ifelse([$2], [main], , dnl Avoid conflicting decl of main. [/* Override any gcc2 internal prototype to avoid an error. */ ]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus extern "C" #endif ])dnl [/* We use char because int might match the return type of a gcc2 builtin and then its argument prototype would still apply. */ char $2(); ]), [$2()], eval "ac_cv_lbl_lib_$ac_lib_var=yes", eval "ac_cv_lbl_lib_$ac_lib_var=no") LIBS="$ac_save_LIBS" ])dnl if eval "test \"`echo '$ac_cv_lbl_lib_'$ac_lib_var`\" = yes"; then AC_MSG_RESULT(yes) ifelse([$3], , [changequote(, )dnl ac_tr_lib=HAVE_LIB`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \ -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'` changequote([, ])dnl AC_DEFINE_UNQUOTED($ac_tr_lib) LIBS="-l$1 $LIBS" ], [$3]) else AC_MSG_RESULT(no) ifelse([$4], , , [$4 ])dnl fi ]) dnl dnl AC_LBL_LIBRARY_NET dnl dnl This test is for network applications that need socket functions and dnl getaddrinfo()/getnameinfo()-ish functions. We now require dnl getaddrinfo() and getnameinfo(). We also prefer versions of dnl recvmsg() that conform to the Single UNIX Specification, so that we dnl can check whether a datagram received with recvmsg() was truncated dnl when received due to the buffer being too small. dnl dnl On most operating systems, they're available in the system library. dnl dnl Under Solaris, we need to link with libsocket and libnsl to get dnl getaddrinfo() and getnameinfo() and, if we have libxnet, we need to dnl link with libxnet before libsocket to get a version of recvmsg() dnl that conforms to the Single UNIX Specification. dnl dnl We use getaddrinfo() because we want a portable thread-safe way dnl of getting information for a host name or port; there exist _r dnl versions of gethostbyname() and getservbyname() on some platforms, dnl but not on all platforms. dnl AC_DEFUN(AC_LBL_LIBRARY_NET, [ # # Most operating systems have getaddrinfo() in the default searched # libraries (i.e. libc). Check there first. # AC_CHECK_FUNC(getaddrinfo,, [ # # Not found in the standard system libraries. # Try libsocket, which requires libnsl. # AC_CHECK_LIB(socket, getaddrinfo, [ # # OK, we found it in libsocket. # LIBS="-lsocket -lnsl $LIBS" ], [ # # We didn't find it. # AC_MSG_ERROR([getaddrinfo is required, but wasn't found]) ], -lnsl) # # OK, do we have recvmsg() in libxnet? # We also link with libsocket and libnsl. # AC_CHECK_LIB(xnet, recvmsg, [ # # Yes - link with it as well. # LIBS="-lxnet $LIBS" ], , -lsocket -lnsl) ]) # DLPI needs putmsg under HPUX so test for -lstr while we're at it AC_SEARCH_LIBS(putmsg, str) ])