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1 # inline.m4 serial 4
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2 dnl Copyright (C) 2006, 2009 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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