IZ62633: NESTING OVERFLOW ISSUES WITH -G

October 2010 PTF for XL C/C++ for AIX, V10.1
October 2010 PTF for XL C for AIX, V10.1
May 2012 PTF for XL C/C++ for AIX, V10.1
January 2013 PTF for XL C for AIX, V10.1
January 2013 PTF for XL C/C++ for AIX, V10.1
XL C/C++ for AIX Fix Pack 18 (July 2013 PTF) for 10.1
XL C/C++ for AIX Fix Pack 19 (October 2013 PTF) for 10.1
XL C/C++ for AIX Fix Pack 21 (October 2015 PTF) for 10.1
XL C for AIX Fix Pack 21 (October 2015 PTF) for 10.1
March 2010 PTF for XL C for AIX, V10.1
March 2010 PTF for XL C/C++ for AIX, V10.1
April 2010 PTF for XL C for AIX, V10.1
April 2010 PTF for XL C/C++ for AIX, V10.1
June 2010 PTF for XL C/C++ for AIX, V10.1
June 2010 PTF for XL C for AIX, V10.1
February 2011 PTF for XL C for AIX, V10.1
May 2011 PTF for XL C/C++ for AIX, V10.1
May 2011 PTF for XL C for AIX, V10.1
October 2011 PTF for XL C/C++ for AIX, V10.1
October 2011 PTF for XL C for AIX, V10.1
February 2012 PTF for XL C for AIX, V10.1
February 2012 PTF for XL C/C++ for AIX, V10.1
May 2012 PTF for XL C for AIX, V10.1
September 2012 PTF for XL C for AIX, V10.1
September 2012 PTF for XL C/C++ for AIX, V10.1
XL C for AIX Fix Pack 18 (July 2013 PTF) for 10.1
XL C for AIX Fix Pack 19 (October 2013 PTF) for 10.1
XL C for AIX Fix Pack 20 (October 2014 PTF) for 10.1
XL C/C++ for AIX Fix Pack 20 (October 2014 PTF) for 10.1

APAR status

• Closed as program error.

Error description

• When using -g and inline asm, the compiler generates debug
  information that the assembler does not currently understand.
  As a result of this, the assembler may produce error messages
  similar to the following:
  
  Assembler:
  assembler_ppc64.s: line 23258: Nesting overflow
  assembler_ppc64.s: line 23268: Nesting overflow
  assembler_ppc64.s: line 23344: Nesting overflow
  assembler_ppc64.s: line 23396: Nesting overflow
  .
  .
  .
  

Local fix

• A current workaround is to avoid using '-g' for the files that
  see the error messages.
  

Problem summary

• USER AFFECTED:
  Users compiling a file with many functions using -g, higher
  level of
  optimization (-O2 and above), some inline functions, and inline
  ASM
  constructs.
    
  PROBLEM DESCRIPTION:
  The compiler generates an assembly file when inline ASM
  constructs are used.
  This assembly file is then sent to the system assembler.
  Without inline ASM
  constructs the compiler avoids this path and functions
  properly.
  In an attempt to provide debug information assembler directives
  are
  issued trying to provide where each instruction comes from.
  With many inlined
  functions and higher level of optimization the complexity of
  these assembler
  directives increases such that an error in the compiler
  resulted in too
  many 'begin inline' directives without matching 'end inline'
  directives.
  

Problem conclusion

• Compiler fixed to issue matching 'begin inline' and 'end
  inline' directives.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  LI75571 LI75602

Fix information

• Fixed component name

  XL C AIX

• Fixed component ID

  5724U8000

Applicable component levels