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33 lines
974 B
Plaintext
33 lines
974 B
Plaintext
# logp1f.m4
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# serial 1
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dnl Copyright (C) 2024-2026 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file is offered as-is, without any warranty.
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AC_DEFUN([gl_FUNC_LOGP1F],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_LOGP1])
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dnl Persuade glibc <math.h> to declare logp1f().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether logp1f() exists. Assume that logp1f(), if it exists, is
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dnl defined in the same library as logp1().
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saved_LIBS="$LIBS"
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LIBS="$LIBS $LOGP1_LIBM"
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AC_CHECK_FUNCS([logp1f])
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LIBS="$saved_LIBS"
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if test $ac_cv_func_logp1f = yes; then
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LOGP1F_LIBM="$LOGP1_LIBM"
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else
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HAVE_LOGP1F=0
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dnl We implement logp1f through log1pf.
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AC_REQUIRE([gl_FUNC_LOG1PF])
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LOGP1F_LIBM="$LOG1PF_LIBM"
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fi
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AC_SUBST([LOGP1F_LIBM])
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])
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