author | Ross Qin <ross.qin@nokia.com> |
Thu, 30 Sep 2010 14:38:30 +0800 | |
branch | RCL_3 |
changeset 16 | 22bdd8a90cc4 |
permissions | -rw-r--r-- |
16
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Intro. |
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The ARMV5 build supports the notion of customization. This allows a |
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programmer to define a new build target that is derived from the ARMV5 |
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build. A new build target is defined via a .BSF file. The build system |
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becomes aware of a customized build by the presence of its .BSF file |
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in $(EPOCROOT)\epoc32\tools. Such customizations are referred to by |
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the name of their .BSF file e.g. the file XScale.bsf defines the build |
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target XScale. This name can be used in exactly the same way as |
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built-in names such as ARMV5. |
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BSF Syntax It is intended that the syntax of a .BSF file be toolchain |
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specific with the exception of the obligatory header: |
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#<BSF># : token to identify this as a BSF file must appear at start of first line. |
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CUSTOMIZES build : identitifies which build is customized by this spec e.g. ARMV5. |
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Currently only ARMV5 can be customized which is the only supported |
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RVCT toolchain build. ARMV5 implements the 'mostly thumb' policy. The |
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ARMV5 specific .BSF syntax is as follows: |
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THUMB_OPTIONS opt1 opt2 ... : compiler options used by default for user side code (expected to be THUMB mode) |
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ARM_OPTIONS opt1 opt2 ... : compiler options used when BUILD_AS_ARM etc are specified (expected to be ARM mode) |
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KERNEL_OPTIONS opt1 opt2 ... : compiler options used to compile kernel side code |
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COMMON_OPTIONS opt1 opt2 ... : compiler options that are added to all the above |
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The above four keywords specify compiler options that can be overriden |
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in an MMP file via OPTION: e.g. |
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OPTION ARMCC -Ospace. |
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A final keyword specifies the system-wide options that cannot be |
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overridden in an MMP file via OPTION. Typically these specify options |
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within the EABI e.g. the SOFTVFP calling convention. They are called |
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invariant since code compiled with different settings will not be |
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binary compatible. |
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INVARIANT_OPTIONS opt opt2 ... : these options are appended to all compiler command lines |
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The following is the contents of the example file |
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armv5_cpu_spec_example.bsf which is exported to |
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$(EPOCROOT)\epoc32\tools from e32toolp\platform. It is intended that |
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users can use this a the basis for their own customizations. |
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--------------------------------EXAMPLE----------------------------------- |
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#<bsf># |
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# Example build specialization file |
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# |
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# NB currently specialization only applies to ARMV5 build using RVCT. |
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# This file customizes the default ARMV5. It specifies a build that |
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# always uses optimization level O1 rather than the default O2. |
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customizes ARMV5 |
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# The following options that can be overridden by MMP files |
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# Use these options when compiling user-side THUMB code |
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thumb_options -thumb -O1 |
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# Use these options when compiling user-side ARM code |
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arm_options -arm -O1 |
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# Use these options when compiling Kernel code |
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kernel_options -arm -O1 |
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# This just factors out common (contingent) options from the above. |
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# These options can also be overridden by MMP files. |
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common_options --diag_suppress 1,161,654,1135,1152,1300 --diag_error 1267 |
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# Fixed options for this build. These options should only be changed with great care since |
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# they have the potential to introduce incompatible ABI (or machine) level effects. |
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# -cpu 5T - this build just targets a generic 5T |
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# -Ono_known_library - we use our own library so tell the compiler not to make assumptions about its implementation |
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# -fpu softvfp - some system code explicitly assumes this variant of the EABI (softvfp+vfp could be used on say XScale) |
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# --dll_vtbl - this switches on class exporting and is needed to support Symbian OS DLL model |
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# -apcs /inter - redundant on 5T, but worth saying anyway |
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invariant_options -cpu 5T -fy -Ono_known_library -fpu softvfp --dll_vtbl -apcs /inter |
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------------------------------------------END EXAMPLE----------------------------------------- |
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