diff options
Diffstat (limited to 'INSTALL')
| -rw-r--r-- | INSTALL | 24 |
1 files changed, 15 insertions, 9 deletions
@@ -157,6 +157,13 @@ any of the following arguments (not a definitive list) to 'configure': released in bulk, thus reducing the total number of mutex operations. See the "opt.tcache" option for usage details. +--disable-thp + Disable transparent huge page (THP) integration. On systems with THP + support, THPs are explicitly disabled as a side effect of unused dirty page + purging for chunks that back small and/or large allocations, because such + chunks typically comprise active, unused dirty, and untouched clean + pages. + --disable-munmap Disable virtual memory deallocation via munmap(2); instead keep track of the virtual memory for later use. munmap() is disabled by default (i.e. @@ -306,17 +313,16 @@ The following environment variables (not a definitive list) impact configure's behavior: CFLAGS="?" - Pass these flags to the compiler. You probably shouldn't define this unless - you know what you are doing. (Use EXTRA_CFLAGS instead.) + Pass these flags to the C compiler. Any flags set by the configure script + are prepended, which means explicitly set flags generally take precedence. + Take care when specifying flags such as -Werror, because configure tests may + be affected in undesirable ways. EXTRA_CFLAGS="?" - Append these flags to CFLAGS. This makes it possible to add flags such as - -Werror, while allowing the configure script to determine what other flags - are appropriate for the specified configuration. - - The configure script specifically checks whether an optimization flag (-O*) - is specified in EXTRA_CFLAGS, and refrains from specifying an optimization - level if it finds that one has already been specified. + Append these flags to CFLAGS, without passing them to the compiler during + configuration. This makes it possible to add flags such as -Werror, while + allowing the configure script to determine what other flags are appropriate + for the specified configuration. CPPFLAGS="?" Pass these flags to the C preprocessor. Note that CFLAGS is not passed to |