| 1 | # inline.m4 serial 4
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| 2 | dnl Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl Test for the 'inline' keyword or equivalent.
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| 8 | dnl Define 'inline' to a supported equivalent, or to nothing if not supported,
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| 9 | dnl like AC_C_INLINE does. Also, define HAVE_INLINE if 'inline' or an
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| 10 | dnl equivalent is effectively supported, i.e. if the compiler is likely to
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| 11 | dnl drop unused 'static inline' functions.
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| 12 | AC_DEFUN([gl_INLINE],
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| 13 | [
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| 14 | AC_REQUIRE([AC_C_INLINE])
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| 15 | AC_CACHE_CHECK([whether the compiler generally respects inline],
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| 16 | [gl_cv_c_inline_effective],
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| 17 | [if test $ac_cv_c_inline = no; then
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| 18 | gl_cv_c_inline_effective=no
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| 19 | else
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| 20 | dnl GCC defines __NO_INLINE__ if not optimizing or if -fno-inline is
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| 21 | dnl specified.
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| 22 | dnl Use AC_COMPILE_IFELSE here, not AC_EGREP_CPP, because the result
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| 23 | dnl depends on optimization flags, which can be in CFLAGS.
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| 24 | dnl (AC_EGREP_CPP looks only at the CPPFLAGS.)
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| 25 | AC_COMPILE_IFELSE(
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| 26 | [AC_LANG_PROGRAM([[]],
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| 27 | [[#ifdef __NO_INLINE__
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| 28 | #error "inline is not effective"
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| 29 | #endif]])],
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| 30 | [gl_cv_c_inline_effective=yes],
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| 31 | [gl_cv_c_inline_effective=no])
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| 32 | fi
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| 33 | ])
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| 34 | if test $gl_cv_c_inline_effective = yes; then
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| 35 | AC_DEFINE([HAVE_INLINE], [1],
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| 36 | [Define to 1 if the compiler supports one of the keywords
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| 37 | 'inline', '__inline__', '__inline' and effectively inlines
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| 38 | functions marked as such.])
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| 39 | fi
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| 40 | ])
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