STM32+IAR 解决Warning[25]: Label 'xxxxx' is defined pubweak in a section implicitly declared root

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#STM32 #IAR

升级至EWARM7.10.1和EWSTM82.10.1后，解决装配过程中出现的Warning[25]问题。通过在.SECTION指令中添加:NOROOT，可避免因默认模式与显式noroot不匹配导致的警告。

在.text:CODE:REORDER（1）后添加:NOROOT，改成.text:CODE:REORDER:NOROOT(1)即可

以下为官方文档：

Warning[25]: Label 'xxxxx' is defined pubweak in a section implicitly declared root

EW targets:	ARM, STM8
EW component:	Assembler
Keywords:	assembly
Last update:	January 12, 2015

Problem
After upgrading to...
EWARM 7.10.1
EWSTM8 2.10.1
...the Warning[25] is issued during assembly of a file that assembled without warning on earlier version of the Embedded Workbench.

Solution
To avoid the warning, add ":NOROOT" to the "SECTION" control directive.
Add the ":NOROOT" to the left of the ()-part of the line.

      PUBWEAK NMI_Handler
      SECTION .text:CODE:REORDER:NOROOT(1)
  NMI_Handler

Background
The assembler is issuing Warning[25] for a deprecated assembler construction.

The deprecated assembler source construction looks like this:

      PUBWEAK NMI_Handler
      SECTION .text:CODE:REORDER(1)
  NMI_Handler

Details
The assembler control directive of "SECTION" consists of:

SECTION section :type [:flag] [(align)]

The change is only to be made among the flag items. I.e. don't change the"SECTION" , "section" , ":type" nor the "[(align)]" parts of the line. (For example if the alignment is expressed as (2) then keep it at (2). (The (2) stands for an alignment of 4 bytes, as the (2) is the power of two to which the address should be aligned.))

The "[:flag]"-part can have these flags:
ROOT (the default mode) or NOROOT
and
REORDER or NOREORDER (the default mode)
Where now the Warning from the Assembler shows that the "explicit noroot", due to the directive "PUBWEAK", mismatch the default mode, which gives an "implied root"
So the "explicit noroot", from "PUBWEAK", should be matched with the flag"NOROOT".

The details for the assembler control directive of "SECTION" can be found in the chapter "Section control directives" in the "IAR Assembler™ Reference Guide."