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Diffstat (limited to 'packages/ndisc6/files/acinclude.m4')
| -rw-r--r-- | packages/ndisc6/files/acinclude.m4 | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/packages/ndisc6/files/acinclude.m4 b/packages/ndisc6/files/acinclude.m4 new file mode 100644 index 0000000000..5360fff5d2 --- /dev/null +++ b/packages/ndisc6/files/acinclude.m4 @@ -0,0 +1,197 @@ +# _AC_C_STD_TRY(STANDARD, TEST-PROLOGUE, TEST-BODY, OPTION-LIST, +# ACTION-IF-AVAILABLE, ACTION-IF-UNAVAILABLE) +# -------------------------------------------------------------- +# Check whether the C compiler accepts features of STANDARD (e.g `c89', `c99') +# by trying to compile a program of TEST-PROLOGUE and TEST-BODY. If this fails, +# try again with each compiler option in the space-separated OPTION-LIST; if one +# helps, append it to CC. If eventually successful, run ACTION-IF-AVAILABLE, +# else ACTION-IF-UNAVAILABLE. +AC_DEFUN([_AC_C_STD_TRY], +[AC_MSG_CHECKING([for $CC option to accept ISO ]m4_translit($1, [c], [C])) +AC_CACHE_VAL(ac_cv_prog_cc_$1, +[ac_cv_prog_cc_$1=no +ac_save_CC=$CC +AC_LANG_CONFTEST([AC_LANG_PROGRAM([$2], [$3])]) +for ac_arg in '' $4 +do + CC="$ac_save_CC $ac_arg" + _AC_COMPILE_IFELSE([], [ac_cv_prog_cc_$1=$ac_arg]) + test "x$ac_cv_prog_cc_$1" != "xno" && break +done +rm -f conftest.$ac_ext +CC=$ac_save_CC +])# AC_CACHE_VAL +case "x$ac_cv_prog_cc_$1" in + x) + AC_MSG_RESULT([none needed]) ;; + xno) + AC_MSG_RESULT([unsupported]) ;; + *) + CC="$CC $ac_cv_prog_cc_$1" + AC_MSG_RESULT([$ac_cv_prog_cc_$1]) ;; +esac +AS_IF([test "x$ac_cv_prog_cc_$1" != xno], [$5], [$6]) +])# _AC_C_STD_TRY + +# _AC_PROG_CC_C99 ([ACTION-IF-AVAILABLE], [ACTION-IF-UNAVAILABLE]) +# ---------------------------------------------------------------- +# If the C compiler is not in ISO C99 mode by default, try to add an +# option to output variable CC to make it so. This macro tries +# various options that select ISO C99 on some system or another. It +# considers the compiler to be in ISO C99 mode if it handles mixed +# code and declarations, _Bool, inline and restrict. +AC_DEFUN([_AC_PROG_CC_C99], +[_AC_C_STD_TRY([c99], +[[#include <stdarg.h> +#include <stdbool.h> +#include <stdlib.h> +#include <wchar.h> +#include <stdio.h> + +struct incomplete_array +{ + int datasize; + double data[]; +}; + +struct named_init { + int number; + const wchar_t *name; + double average; +}; + +typedef const char *ccp; + +static inline int +test_restrict(ccp restrict text) +{ + // See if C++-style comments work. + // Iterate through items via the restricted pointer. + // Also check for declarations in for loops. + for (unsigned int i = 0; *(text+i) != '\0'; ++i) + continue; + return 0; +} + +// Check varargs and va_copy work. +static void +test_varargs(const char *format, ...) +{ + va_list args; + va_start(args, format); + va_list args_copy; + va_copy(args_copy, args); + + const char *str; + int number; + float fnumber; + + while (*format) + { + switch (*format++) + { + case 's': // string + str = va_arg(args_copy, const char *); + break; + case 'd': // int + number = va_arg(args_copy, int); + break; + case 'f': // float + fnumber = (float) va_arg(args_copy, double); + break; + default: + break; + } + } + va_end(args_copy); + va_end(args); +} +]], +[[ + // Check bool and long long datatypes. + _Bool success = false; + long long int bignum = -1234567890LL; + unsigned long long int ubignum = 1234567890uLL; + + // Check restrict. + if (test_restrict("String literal") != 0) + success = true; + char *restrict newvar = "Another string"; + + // Check varargs. + test_varargs("s, d' f .", "string", 65, 34.234); + + // Check incomplete arrays work. + struct incomplete_array *ia = + malloc(sizeof(struct incomplete_array) + (sizeof(double) * 10)); + ia->datasize = 10; + for (int i = 0; i < ia->datasize; ++i) + ia->data[i] = (double) i * 1.234; + + // Check named initialisers. + struct named_init ni = { + .number = 34, + .name = L"Test wide string", + .average = 543.34343, + }; + + ni.number = 58; + + int dynamic_array[ni.number]; + dynamic_array[43] = 543; + + // work around unused variable warnings + return bignum == 0LL || ubignum == 0uLL || newvar[0] == 'x'; +]], +dnl Try +dnl GCC -std=gnu99 (unused restrictive modes: -std=c99 -std=iso9899:1999) +dnl AIX -qlanglvl=extc99 (unused restrictive mode: -qlanglvl=stdc99) +dnl Intel ICC -c99 +dnl IRIX -c99 +dnl Solaris (unused because it causes the compiler to assume C99 semantics for +dnl library functions, and this is invalid before Solaris 10: -xc99) +dnl Tru64 -c99 +dnl with extended modes being tried first. +[[-std=gnu99 -c99 -qlanglvl=extc99]], [$1], [$2])[]dnl +])# _AC_PROG_CC_C99 + +# AC_PROG_CC_C99 +# -------------- +AC_DEFUN([AC_PROG_CC_C99], +[ AC_REQUIRE([AC_PROG_CC])dnl + _AC_PROG_CC_C99 +]) + +# AC_USE_SYSTEM_EXTENSIONS +# ------------------------ +# Enable extensions on systems that normally disable them, +# typically due to standards-conformance issues. +AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], +[ + AC_BEFORE([$0], [AC_COMPILE_IFELSE]) + AC_BEFORE([$0], [AC_RUN_IFELSE]) + + AC_REQUIRE([AC_GNU_SOURCE]) + AC_REQUIRE([AC_AIX]) + AC_REQUIRE([AC_MINIX]) + + AH_VERBATIM([__EXTENSIONS__], +[/* Enable extensions on Solaris. */ +#ifndef __EXTENSIONS__ +# undef __EXTENSIONS__ +#endif +#ifndef _POSIX_PTHREAD_SEMANTICS +# undef _POSIX_PTHREAD_SEMANTICS +#endif]) + AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], + [ac_cv_safe_to_define___extensions__], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([ +# define __EXTENSIONS__ 1 + AC_INCLUDES_DEFAULT])], + [ac_cv_safe_to_define___extensions__=yes], + [ac_cv_safe_to_define___extensions__=no])]) + test $ac_cv_safe_to_define___extensions__ = yes && + AC_DEFINE([__EXTENSIONS__]) + AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) +]) |