89 lines
2.5 KiB
Plaintext
89 lines
2.5 KiB
Plaintext
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dnl acinclude.m4. Change *this* file to add new or change macros.
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dnl When changes have been made, delete aclocal.m4 and run
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dnl "aclocal".
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dnl
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dnl DO NOT change aclocal.m4 !
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dnl
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dnl * LA_SEARCH_FILE(variable, filename, PATH)
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dnl * Search "filename" in the specified "PATH", "variable" will
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dnl * contain the full pathname or the empty string
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dnl * PATH is space-separated list of directories.
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dnl * by Florian Bomers
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AC_DEFUN([LA_SEARCH_FILE],[
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$1=
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dnl hack: eliminate line feeds in $2
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for FILE in $2; do
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for DIR in $3; do
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dnl use PATH in order
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if test ".$1"="." && test -f "$DIR/$FILE"; then
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$1=$DIR
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fi
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done
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done
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])
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dnl * LA_SEARCH_LIB(lib-variable, include-variable, lib-filename, header-filename, prefix)
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dnl * looks for "lib-filename" and "header-filename" in the area of "prefix".
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dnl * if found, "lib-variable" and "include-variable" are set to the
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dnl * respective paths.
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dnl * prefix is a single path
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dnl * libs are searched in prefix, prefix/lib, prefix/.., prefix/../lib
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dnl * headers are searched in prefix, prefix/include, prefix/.., prefix/../include
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dnl *
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dnl * If one of them is not found, both "lib-variable", "include-variable" are
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dnl * set to the empty string.
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dnl *
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dnl * TODO: assert function call to verify lib
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dnl *
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dnl * by Florian Bomers
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AC_DEFUN([LA_SEARCH_LIB],[
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dnl look for lib
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LA_SEARCH_FILE($1, $3, $5 $5/lib $5/.. $5/../lib)
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dnl look for header.
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LA_SEARCH_FILE($2, $4, $5 $5/include $5/.. $5/../include)
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if test ".$1" = "." || test ".$2" = "."; then
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$1=
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$2=
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fi
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])
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# alex_IEEE854_FLOAT80
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# ------------
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AC_DEFUN([alex_IEEE854_FLOAT80],
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[AC_CACHE_CHECK(for IEEE854 compliant 80 bit floats, alex_cv_ieee854_float80,
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[AC_TRY_RUN([
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int float2long_IEEE_compliance ( void )
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{
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struct {
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long padding; /* to prevent unaligned access */
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float f;
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} s;
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s.f = 12582912.; if ( *(long*)(&s.f) != 1262485504l ) return 0;
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s.f = 12615679.; if ( *(long*)(&s.f) != 1262518271l ) return 0;
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s.f = 13582912.; if ( *(long*)(&s.f) != 1263485504l ) return 0;
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s.f = 12550145.; if ( *(long*)(&s.f) != 1262452737l ) return 0;
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s.f = 11582912.; if ( *(long*)(&s.f) != 1261485504l ) return 0;
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return 1;
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}
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int main(void)
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{
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int retval;
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retval = float2long_IEEE_compliance();
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/* no error return -> success */
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return !retval;
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}
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], alex_cv_ieee854_float80=yes, alex_cv_ieee854_float80=no,
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[AC_MSG_WARN(can't check for IEEE854 compliant 80 bit floats)]
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)])]) # alex_IEEE854_FLOAT80
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