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annotate autoconf/m4/linux_mixed_64_32.m4 @ 40:e34ccae0bb26

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create if(setjmp) statement automatically.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 26 Dec 2013 19:56:35 +0900
parents 95c75e76d11b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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1 #
95c75e76d11b LLVM 3.4
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2 # Some Linux machines run a 64-bit kernel with a 32-bit userspace. 'uname -m'
95c75e76d11b LLVM 3.4
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3 # shows these as x86_64. Ask the system 'gcc' what it thinks.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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4 #
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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5 AC_DEFUN([AC_IS_LINUX_MIXED],
95c75e76d11b LLVM 3.4
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6 [AC_CACHE_CHECK(for 32-bit userspace on 64-bit system,llvm_cv_linux_mixed,
95c75e76d11b LLVM 3.4
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7 [ AC_LANG_PUSH([C])
95c75e76d11b LLVM 3.4
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8 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
95c75e76d11b LLVM 3.4
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9 [[#ifndef __x86_64__
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10 error: Not x86-64 even if uname says so!
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11 #endif
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12 ]])],
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13 [llvm_cv_linux_mixed=no],
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14 [llvm_cv_linux_mixed=yes])
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15 AC_LANG_POP([C])
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16 ])
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17 ])