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Diffstat (limited to '')
| -rw-r--r-- | m4/openssh.m4 | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/m4/openssh.m4 b/m4/openssh.m4 new file mode 100644 index 0000000..5d4c562 --- /dev/null +++ b/m4/openssh.m4 @@ -0,0 +1,217 @@ +dnl OpenSSH-specific autoconf macros +dnl + +dnl The test program that is used to try to trigger various compiler +dnl behaviours. +AC_DEFUN([OSSH_COMPILER_FLAG_TEST_PROGRAM], + [AC_LANG_SOURCE([[ +#include <stdlib.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> +/* Trivial function to help test for -fzero-call-used-regs */ +int f(int n) {return rand() % n;} +char *f2(char *s, ...) { + char ret[64]; + va_list args; + va_start(args, s); + vsnprintf(ret, sizeof(ret), s, args); + va_end(args); + return strdup(ret); +} +int main(int argc, char **argv) { + (void)argv; + char b[256], *cp; + /* Some math to catch -ftrapv problems in the toolchain */ + int i = 123 * argc, j = 456 + argc, k = 789 - argc; + float l = i * 2.1; + double m = l / 0.5; + long long int n = argc * 12345LL, o = 12345LL * (long long int)argc; + f(1); + snprintf(b, sizeof b, "%d %d %d %f %f %lld %lld\n", i,j,k,l,m,n,o); + if (write(1, b, 0) == -1) exit(0); + cp = f2("%d %d %d %f %f %lld %lld\n", i,j,k,l,m,n,o); + free(cp); + /* + * Test fallthrough behaviour. clang 10's -Wimplicit-fallthrough does + * not understand comments and we don't use the "fallthrough" attribute + * that it's looking for. + */ + switch(i){ + case 0: j += i; + /* FALLTHROUGH */ + default: j += k; + } + exit(0); +} + ]])] +) + +dnl OSSH_CHECK_CFLAG_COMPILE(check_flag[, define_flag]) +dnl Check that $CC accepts a flag 'check_flag'. If it is supported append +dnl 'define_flag' to $CFLAGS. If 'define_flag' is not specified, then append +dnl 'check_flag'. +AC_DEFUN([OSSH_CHECK_CFLAG_COMPILE], [{ + AC_MSG_CHECKING([if $CC supports compile flag $1]) + saved_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $WERROR $1" + _define_flag="$2" + test "x$_define_flag" = "x" && _define_flag="$1" + AC_COMPILE_IFELSE([OSSH_COMPILER_FLAG_TEST_PROGRAM], + [ +if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null +then + AC_MSG_RESULT([no]) + CFLAGS="$saved_CFLAGS" +else + dnl If we are compiling natively, try running the program. + AC_RUN_IFELSE([OSSH_COMPILER_FLAG_TEST_PROGRAM], + [ AC_MSG_RESULT([yes]) + CFLAGS="$saved_CFLAGS $_define_flag" ], + [ AC_MSG_RESULT([no, fails at run time]) + CFLAGS="$saved_CFLAGS" ], + [ AC_MSG_RESULT([yes]) + CFLAGS="$saved_CFLAGS $_define_flag" ], + ) +fi], + [ AC_MSG_RESULT([no]) + CFLAGS="$saved_CFLAGS" ] + ) +}]) + +dnl OSSH_CHECK_CFLAG_LINK(check_flag[, define_flag]) +dnl Check that $CC accepts a flag 'check_flag'. If it is supported append +dnl 'define_flag' to $CFLAGS. If 'define_flag' is not specified, then append +dnl 'check_flag'. +AC_DEFUN([OSSH_CHECK_CFLAG_LINK], [{ + AC_MSG_CHECKING([if $CC supports compile flag $1 and linking succeeds]) + saved_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $WERROR $1" + _define_flag="$2" + test "x$_define_flag" = "x" && _define_flag="$1" + AC_LINK_IFELSE([OSSH_COMPILER_FLAG_TEST_PROGRAM], + [ +if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null +then + AC_MSG_RESULT([no]) + CFLAGS="$saved_CFLAGS" +else + dnl If we are compiling natively, try running the program. + AC_RUN_IFELSE([OSSH_COMPILER_FLAG_TEST_PROGRAM], + [ AC_MSG_RESULT([yes]) + CFLAGS="$saved_CFLAGS $_define_flag" ], + [ AC_MSG_RESULT([no, fails at run time]) + CFLAGS="$saved_CFLAGS" ], + [ AC_MSG_RESULT([yes]) + CFLAGS="$saved_CFLAGS $_define_flag" ], + ) +fi], + [ AC_MSG_RESULT([no]) + CFLAGS="$saved_CFLAGS" ] + ) +}]) + +dnl OSSH_CHECK_LDFLAG_LINK(check_flag[, define_flag]) +dnl Check that $LD accepts a flag 'check_flag'. If it is supported append +dnl 'define_flag' to $LDFLAGS. If 'define_flag' is not specified, then append +dnl 'check_flag'. +AC_DEFUN([OSSH_CHECK_LDFLAG_LINK], [{ + AC_MSG_CHECKING([if $LD supports link flag $1]) + saved_LDFLAGS="$LDFLAGS" + LDFLAGS="$LDFLAGS $WERROR $1" + _define_flag="$2" + test "x$_define_flag" = "x" && _define_flag="$1" + AC_LINK_IFELSE([OSSH_COMPILER_FLAG_TEST_PROGRAM], + [ +if $ac_cv_path_EGREP -i "unrecognized option|warning.*ignored" conftest.err >/dev/null +then + AC_MSG_RESULT([no]) + LDFLAGS="$saved_LDFLAGS" +else + dnl If we are compiling natively, try running the program. + AC_RUN_IFELSE([OSSH_COMPILER_FLAG_TEST_PROGRAM], + [ AC_MSG_RESULT([yes]) + LDFLAGS="$saved_LDFLAGS $_define_flag" ], + [ AC_MSG_RESULT([no, fails at run time]) + LDFLAGS="$saved_LDFLAGS" ], + [ AC_MSG_RESULT([yes]) + LDFLAGS="$saved_LDFLAGS $_define_flag" ] + ) +fi ], + [ AC_MSG_RESULT([no]) + LDFLAGS="$saved_LDFLAGS" ] + ) +}]) + +dnl OSSH_CHECK_HEADER_FOR_FIELD(field, header, symbol) +dnl Does AC_EGREP_HEADER on 'header' for the string 'field' +dnl If found, set 'symbol' to be defined. Cache the result. +dnl TODO: This is not foolproof, better to compile and read from there +AC_DEFUN([OSSH_CHECK_HEADER_FOR_FIELD], [ +# look for field '$1' in header '$2' + dnl This strips characters illegal to m4 from the header filename + ossh_safe=`echo "$2" | sed 'y%./+-%__p_%'` + dnl + ossh_varname="ossh_cv_$ossh_safe""_has_"$1 + AC_MSG_CHECKING(for $1 field in $2) + AC_CACHE_VAL($ossh_varname, [ + AC_EGREP_HEADER($1, $2, [ dnl + eval "$ossh_varname=yes" dnl + ], [ dnl + eval "$ossh_varname=no" dnl + ]) dnl + ]) + ossh_result=`eval 'echo $'"$ossh_varname"` + if test -n "`echo $ossh_varname`"; then + AC_MSG_RESULT($ossh_result) + if test "x$ossh_result" = "xyes"; then + AC_DEFINE($3, 1, [Define if you have $1 in $2]) + fi + else + AC_MSG_RESULT(no) + fi +]) + +dnl Check for socklen_t: historically on BSD it is an int, and in +dnl POSIX 1g it is a type of its own, but some platforms use different +dnl types for the argument to getsockopt, getpeername, etc. So we +dnl have to test to find something that will work. +AC_DEFUN([TYPE_SOCKLEN_T], +[ + AC_CHECK_TYPE([socklen_t], ,[ + AC_MSG_CHECKING([for socklen_t equivalent]) + AC_CACHE_VAL([curl_cv_socklen_t_equiv], + [ + # Systems have either "struct sockaddr *" or + # "void *" as the second argument to getpeername + curl_cv_socklen_t_equiv= + for arg2 in "struct sockaddr" void; do + for t in int size_t unsigned long "unsigned long"; do + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ + #include <sys/types.h> + #include <sys/socket.h> + int getpeername (int, $arg2 *, $t *); + ]], [[ + $t len; + getpeername(0,0,&len); + ]]) + ],[ + curl_cv_socklen_t_equiv="$t" + break + ]) + done + done + + if test "x$curl_cv_socklen_t_equiv" = x; then + AC_MSG_ERROR([Cannot find a type to use in place of socklen_t]) + fi + ]) + AC_MSG_RESULT($curl_cv_socklen_t_equiv) + AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv, + [type to use in place of socklen_t if not defined])], + [#include <sys/types.h> +#include <sys/socket.h>]) +]) + |