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per the recommended style guide for autoconf and so that individual autoconf functions can more easily be shared across projects. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16223 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
720 B
Plaintext
33 lines
720 B
Plaintext
#
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# Check for the ability to mmap a file.
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#
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AC_DEFUN([AC_FUNC_MMAP_FILE],
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[AC_CACHE_CHECK(for mmap of files,
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ac_cv_func_mmap_file,
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[AC_LANG_SAVE
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AC_LANG_C
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AC_TRY_RUN([
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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int fd;
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int main () {
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fd = creat ("foo",0777); fd = (int) mmap (0, 1, PROT_READ, MAP_SHARED, fd, 0); unlink ("foo"); return (fd != (int) MAP_FAILED);}],
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ac_cv_func_mmap_file=yes, ac_cv_func_mmap_file=no)
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AC_LANG_RESTORE
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])
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if test "$ac_cv_func_mmap_file" = yes; then
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AC_DEFINE([HAVE_MMAP_FILE],[],[Define if mmap() can map files into memory])
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AC_SUBST(MMAP_FILE,[yes])
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fi
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])
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