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Define HAVE_ for math long double functions declared in vxworks headers

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When cross-building for vxworks, test for declarations of long double
functions in math.h.  We don't normally test for these functions when
cross compiling, because link tests don't work, or ever really, but
not defining them as available causes replacements to be defined in
ways that may cause duplicate definition linker errors if the units
defining both the replacement and the actual implementation are
brought in because of other symbols.


for libstdc++-v3/ChangeLog

	* crossconfig.m4 (GLIBCXX_CROSSCONFIG) [*-vxworks*]: Define
	long double functions as available if declared by math.h.
	(GLIBCXX_CHECK_MATH_DECL, GLIBCXX_CHECK_MATH_DECLS): New.
	* configure: Rebuild.

From-SVN: r279731
This commit is contained in:
Alexandre Oliva 2019-12-25 06:43:22 +00:00 committed by Alexandre Oliva
parent de0db05147
commit 85129ff10a
3 changed files with 1173 additions and 0 deletions
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7
libstdc++-v3/ChangeLog
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@ -1,3 +1,10 @@
2019-12-25 Alexandre Oliva <oliva@adacore.com>
* crossconfig.m4 (GLIBCXX_CROSSCONFIG) [*-vxworks*]: Define
long double functions as available if declared by math.h.
(GLIBCXX_CHECK_MATH_DECL, GLIBCXX_CHECK_MATH_DECLS): New.
* configure: Rebuild.
2019-12-20 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/92927

1104
libstdc++-v3/configure vendored
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62
libstdc++-v3/crossconfig.m4
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@ -291,9 +291,71 @@ case "${host}" in
AC_DEFINE(HAVE_SQRTF)
AC_DEFINE(HAVE_TANF)
AC_DEFINE(HAVE_TANHF)
dnl # Different versions and execution modes implement different
dnl # subsets of these functions. Instead of hard-coding, test for C
dnl # declarations in headers. The C primitives could be defined as
dnl # macros, in which case the tests might fail, and we might have to
dnl # switch to more elaborate tests.
GLIBCXX_CHECK_MATH_DECLS([
acosl asinl atan2l atanl ceill cosl coshl expl fabsl floorl fmodl
frexpl ldexpl log10l logl modfl powl sinl sinhl sqrtl tanl tanhl])
dnl # sincosl is the only one missing here, compared with the *l
dnl # functions in the list guarded by
dnl # long_double_math_on_this_cpu in configure.ac, right after
dnl # the expansion of the present macro.
;;
*)
AC_MSG_ERROR([No support for this host/target combination.])
;;
esac
])
dnl
dnl Check to see if the (math function) argument passed is
dnl declared when using the c compiler
dnl
dnl Define HAVE_CARGF etc if "cargf" is declared
dnl
dnl argument 1 is name of function to check
dnl
dnl ASSUMES argument is a math function
dnl
dnl GLIBCXX_CHECK_MATH_DECL
AC_DEFUN([GLIBCXX_CHECK_MATH_DECL], [
AC_CACHE_CHECK([for $1 declaration],
[glibcxx_cv_func_$1_use], [
AC_LANG_SAVE
AC_LANG_C
AC_TRY_COMPILE([
#include <math.h>
#ifdef HAVE_IEEEFP_H
# include <ieeefp.h>
#endif
], [
void (*f)(void) = (void (*)(void))$1;
], [glibcxx_cv_func_$1_use=yes
], [glibcxx_cv_func_$1_use=no])])
if test "x$glibcxx_cv_func_$1_use" = xyes; then
AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1]))
fi
])
dnl
dnl Check to see whether multiple math functions are
dnl declared when using the c compiler
dnl
dnl Define HAVE_CARGF HAVE_POWL etc if "cargf" and "powl"
dnl are declared
dnl
dnl argument 1 is a word list naming function to check
dnl
dnl ASSUMES arguments are math functions
dnl
dnl GLIBCXX_CHECK_MATH_DECLS
AC_DEFUN([GLIBCXX_CHECK_MATH_DECLS], [
m4_foreach_w([glibcxx_func], [$1], [
GLIBCXX_CHECK_MATH_DECL(glibcxx_func)
])
])