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[svn-r18976] Added comments regarding the -D_POSIX_SOURCE flag including a reference to a discussion of the _POSIX_SOURCE, BSD_SOURCE, and _POSIX_C_SOURCE Macros and their intersaction at http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html.

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Comment text only - not tested.
This commit is contained in:
Larry Knox 2010-06-04 11:01:39 -05:00
parent c09abb3250
commit 7d1adc1f35
1 changed files with 12 additions and 1 deletions
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13
configure.in
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@ -1365,7 +1365,18 @@ case "$host_cpu-$host_vendor-$host_os" in
dnl Add POSIX support on Linux systems, so <features.h> defines
dnl __USE_POSIX, which is required to get the prototype for fdopen
dnl defined correctly in <stdio.h>
dnl defined correctly in <stdio.h>.
dnl This flag was removed from h5cc as of 2009-10-17 when it was found
dnl that the flag broke compiling netCDF-4 code with h5cc, but kept in
dnl H5_CPPFLAGS because fdopen and HDfdopen fail without it. HDfdopen
dnl is used only by H5_debug_mask which is used only when debugging in
dnl H5_init_library (all in H5.c). When the flag was removed this was
dnl the only compile failure noted; however, defining the Macro
dnl makes available the functionality from the POSIX.1 standard as well
dnl as all or the ISO C facilities, according to a discussion of
dnl defining the _POSIX_SOURCE, _BSD_SOURCE, and _POSIX_C_SOURCE Macros
dnl and their interaction found at
dnl http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html.
H5_CPPFLAGS="-D_POSIX_SOURCE $H5_CPPFLAGS"
dnl Also add BSD support on Linux systems, so <features.h> defines