align

align none

Tells the compiler not to add padding bytes anywhere in common blocks or structures. This is the same as specifying noalign.

align commons

Aligns all common block entities on natural boundaries up to 4 bytes, by adding padding bytes as needed.

The align nocommons option adds no padding to common blocks. In this case, unaligned data can occur unless the order of data items specified in the COMMON statement places the largest numeric data item first, followed by the next largest numeric data (and so on), followed by any character data.

align dcommons

Aligns all common block entities on natural boundaries up to 8 bytes, by adding padding bytes as needed.

This option is useful for applications that use common blocks, unless your application has no unaligned data or, if the application might have unaligned data, all data items are four bytes or smaller. For applications that use common blocks where all data items are four bytes or smaller, you can specify /align:commons instead of /align:dcommons.

The align nodcommons option adds no padding to common blocks.

On Windows systems, if you specify the /stand:f90 or /stand:f95 option, /align:dcommons is ignored.

On Linux and Mac OS X systems, if you specify any -std option or the -stand f90 or -stand f95 option, -align dcommons is ignored.

align norecords

Aligns components of derived types and fields within record structures on arbitrary byte boundaries with no padding.

The align records option requests that multiple data items in record structures and derived-type structures without the SEQUENCE statement be naturally aligned, by adding padding as needed.

align recnbyte

Aligns components of derived types and fields within record structures on the smaller of the size boundary specified (n) or the boundary that will naturally align them. n can be 1, 2, 4, 8, or 16. When you specify this option, each structure member after the first is stored on either the size of the member type or n-byte boundaries, whichever is smaller. For example, to specify 2 bytes as the packing boundary (or alignment constraint) for all structures and unions in the file prog1.f, use the following command:ifort {-align rec2byte | /align:rec2byte} prog1.f

This option does not affect whether common blocks are naturally aligned or packed.

align sequence

Aligns components of a derived type declared with the SEQUENCE statement (sequenced components) according to the alignment rules that are currently in use. The default alignment rules are to align unsequenced components on natural boundaries.

The align nosequence option requests that sequenced components be packed regardless of any other alignment rules. Note that align none implies align nosequence.

If you specify an option for standards checking, /align:sequence is ignored.

align all

Tells the compiler to add padding bytes whenever possible to obtain the natural alignment of data items in common blocks, derived types, and record structures. Specifies align nocommons, align dcommons, align records, align nosequence. This is the same as specifying align with no keyword.