| [49] | 1 | dnl AB_CHECK_FLAG(FLAG, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]) |
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| 2 | AC_DEFUN(AB_CHECK_FLAG, |
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| 3 | [ |
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| 4 | AC_MSG_CHECKING([whether ifelse(AC_LANG, CPLUSPLUS, ${CXX}, ${CC}) supports the $1 flag]) |
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| 5 | ab_flag_var=`echo $1 | sed 'y%./+-%__p_%'` |
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| 6 | AC_CACHE_VAL(ab_cv_flag_$ab_flag_var, |
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| 7 | [ |
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| 8 | ifelse(AC_LANG, CPLUSPLUS, [ |
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| 9 | ab_save_flags="$CXXFLAGS" |
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| 10 | CXXFLAGS="$CXXFLAGS $1" |
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| 11 | ], [ |
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| 12 | ab_save_flags="$CFLAGS" |
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| 13 | CFLAGS="$CFLAGS $1" |
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| 14 | ])dnl |
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| 15 | AC_TRY_COMPILE(,[int a;], |
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| 16 | eval "ab_cv_flag_$ab_flag_var=yes", eval "ab_cv_flag_$ab_flag_var=no") |
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| 17 | ifelse(AC_LANG, CPLUSPLUS, CXXFLAGS="$ab_save_flags", CFLAGS="$ab_save_flags") |
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| 18 | ]) |
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| 19 | if eval "test \"`echo '$ab_cv_flag_'$ab_flag_var`\" = yes"; then |
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| 20 | AC_MSG_RESULT(yes) |
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| 21 | ifelse([$2], , :, [$2]) |
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| 22 | else |
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| 23 | AC_MSG_RESULT(no) |
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| 24 | ifelse([$3], , , [$3 |
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| 25 | ])dnl |
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| 26 | fi |
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| 27 | ]) |
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| 28 | |
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| 29 | dnl AB_ADD_FLAGS(FLAG...) |
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| 30 | AC_DEFUN(AB_ADD_FLAGS, |
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| 31 | [ab_flags= |
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| 32 | for ab_flag in $1; do |
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| 33 | AB_CHECK_FLAG([$ab_flag], [ab_flags="$ab_flags $ab_flag"]) |
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| 34 | ifelse(AC_LANG, CPLUSPLUS, [ |
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| 35 | ADDCXXFLAGS="$ab_flags" |
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| 36 | AC_SUBST(ADDCXXFLAGS) |
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| 37 | ], [ |
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| 38 | ADDCFLAGS="$ab_flags" |
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| 39 | AC_SUBST(ADDCFLAGS) |
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| 40 | ])dnl |
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| 41 | done |
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| 42 | ]) |
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| 43 | |
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| 44 | AC_DEFUN(AB_C_BIGENDIAN, |
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| 45 | [AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian, |
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| 46 | [ac_cv_c_bigendian=unknown |
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| 47 | # See if we have a good endian.h. |
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| 48 | AC_TRY_CPP([#include <endian.h>], [AC_TRY_COMPILE([#include <endian.h>], [ |
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| 49 | #if !__BYTE_ORDER || !__BIG_ENDIAN |
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| 50 | bogus endian macros |
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| 51 | #endif], [AC_TRY_COMPILE([#include <endian.h>], [ |
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| 52 | #if __BYTE_ORDER != __BIG_ENDIAN |
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| 53 | not big endian |
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| 54 | #endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])]) |
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| 55 | if test $ac_cv_c_bigendian = unknown; then |
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| 56 | # See if sys/param.h defines the BYTE_ORDER macro. |
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| 57 | AC_TRY_COMPILE([#include <sys/types.h> |
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| 58 | #include <sys/param.h>], [ |
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| 59 | #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN |
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| 60 | bogus endian macros |
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| 61 | #endif], [# It does; now see whether it defined to BIG_ENDIAN or not. |
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| 62 | AC_TRY_COMPILE([#include <sys/types.h> |
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| 63 | #include <sys/param.h>], [ |
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| 64 | #if BYTE_ORDER != BIG_ENDIAN |
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| 65 | not big endian |
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| 66 | #endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)]) |
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| 67 | fi |
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| 68 | if test $ac_cv_c_bigendian = unknown; then |
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| 69 | AC_TRY_RUN([main () { |
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| 70 | /* Are we little or big endian? From Harbison&Steele. */ |
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| 71 | union |
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| 72 | { |
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| 73 | long l; |
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| 74 | char c[sizeof (long)]; |
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| 75 | } u; |
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| 76 | u.l = 1; |
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| 77 | exit (u.c[sizeof (long) - 1] == 1); |
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| 78 | }], ac_cv_c_bigendian=no, ac_cv_c_bigendian=yes) |
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| 79 | fi]) |
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| 80 | if test $ac_cv_c_bigendian = yes; then |
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| 81 | AC_DEFINE(WORDS_BIGENDIAN) |
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| 82 | fi |
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| 83 | ]) |
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