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Add unistd.h checks back to the CMake build.

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getpagesize(), as well as its POSIX.2001 replacement
sysconf(_SC_PAGESIZE), is defined in <unistd.h>. On Linux and OS X,
including <sys/mman.h> is sufficient to get a definition for
getpagesize(). However, this is not true for the Android NDK. This CL
brings back the HAVE_UNISTD_H definition and its associated header
check.

This also adds a HAVE_FUNC_SYSCONF definition, which checks for the
presence of sysconf(). The definition can be used later to replace
getpagesize() with sysconf().
This commit is contained in:
costan
2017-08-02 09:43:03 -07:00
committed by Victor Costan
parent c8049c5827
commit 77c12adc19
3 changed files with 12 additions and 0 deletions
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6
cmake/config.h.in
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@@ -13,6 +13,9 @@
/* Define to 1 if you have a definition for mmap() in <sys/mman.h>. */
#cmakedefine HAVE_FUNC_MMAP 1
/* Define to 1 if you have a definition for sysconf() in <unistd.h>. */
#cmakedefine HAVE_FUNC_SYSCONF 1
/* Define to 1 to use the gflags package for command-line parsing. */
#cmakedefine HAVE_GFLAGS 1
@@ -46,6 +49,9 @@
/* Define to 1 if you have the <sys/uio.h> header file. */
#cmakedefine HAVE_SYS_UIO_H 1
/* Define to 1 if you have the <unistd.h> header file. */
#cmakedefine HAVE_UNISTD_H 1
/* Define to 1 if you have the <windows.h> header file. */
#cmakedefine HAVE_WINDOWS_H 1