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1 |
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2 Intro. |
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3 The ARMV5 build supports the notion of customization. This allows a |
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4 programmer to define a new build target that is derived from the ARMV5 |
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5 build. A new build target is defined via a .BSF file. The build system |
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6 becomes aware of a customized build by the presence of its .BSF file |
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7 in $(EPOCROOT)\epoc32\tools. Such customizations are referred to by |
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8 the name of their .BSF file e.g. the file XScale.bsf defines the build |
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9 target XScale. This name can be used in exactly the same way as |
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10 built-in names such as ARMV5. |
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11 |
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12 BSF Syntax It is intended that the syntax of a .BSF file be toolchain |
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13 specific with the exception of the obligatory header: |
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14 |
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15 #<BSF># : token to identify this as a BSF file must appear at start of first line. |
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16 CUSTOMIZES build : identitifies which build is customized by this spec e.g. ARMV5. |
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17 |
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18 Currently only ARMV5 can be customized which is the only supported |
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19 RVCT toolchain build. ARMV5 implements the 'mostly thumb' policy. The |
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20 ARMV5 specific .BSF syntax is as follows: |
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21 |
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22 |
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23 THUMB_OPTIONS opt1 opt2 ... : compiler options used by default for user side code (expected to be THUMB mode) |
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24 ARM_OPTIONS opt1 opt2 ... : compiler options used when BUILD_AS_ARM etc are specified (expected to be ARM mode) |
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25 KERNEL_OPTIONS opt1 opt2 ... : compiler options used to compile kernel side code |
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26 COMMON_OPTIONS opt1 opt2 ... : compiler options that are added to all the above |
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27 |
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28 The above four keywords specify compiler options that can be overriden |
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29 in an MMP file via OPTION: e.g. |
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30 |
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31 OPTION ARMCC -Ospace. |
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32 |
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33 A final keyword specifies the system-wide options that cannot be |
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34 overridden in an MMP file via OPTION. Typically these specify options |
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35 within the EABI e.g. the SOFTVFP calling convention. They are called |
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36 invariant since code compiled with different settings will not be |
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37 binary compatible. |
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38 |
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39 INVARIANT_OPTIONS opt opt2 ... : these options are appended to all compiler command lines |
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40 |
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41 The following is the contents of the example file |
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42 armv5_cpu_spec_example.bsf which is exported to |
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43 $(EPOCROOT)\epoc32\tools from e32toolp\platform. It is intended that |
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44 users can use this a the basis for their own customizations. |
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45 |
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46 --------------------------------EXAMPLE----------------------------------- |
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47 |
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48 #<bsf># |
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49 |
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50 # Example build specialization file |
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51 # |
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52 # NB currently specialization only applies to ARMV5 build using RVCT. |
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53 |
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54 # This file customizes the default ARMV5. It specifies a build that |
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55 # always uses optimization level O1 rather than the default O2. |
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56 customizes ARMV5 |
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57 |
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58 # The following options that can be overridden by MMP files |
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59 |
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60 # Use these options when compiling user-side THUMB code |
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61 thumb_options -thumb -O1 |
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62 |
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63 # Use these options when compiling user-side ARM code |
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64 arm_options -arm -O1 |
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65 |
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66 # Use these options when compiling Kernel code |
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67 kernel_options -arm -O1 |
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68 |
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69 # This just factors out common (contingent) options from the above. |
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70 # These options can also be overridden by MMP files. |
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71 common_options --diag_suppress 1,161,654,1135,1152,1300 --diag_error 1267 |
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72 |
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73 # Fixed options for this build. These options should only be changed with great care since |
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74 # they have the potential to introduce incompatible ABI (or machine) level effects. |
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75 # -cpu 5T - this build just targets a generic 5T |
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76 # -Ono_known_library - we use our own library so tell the compiler not to make assumptions about its implementation |
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77 # -fpu softvfp - some system code explicitly assumes this variant of the EABI (softvfp+vfp could be used on say XScale) |
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78 # --dll_vtbl - this switches on class exporting and is needed to support Symbian OS DLL model |
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79 # -apcs /inter - redundant on 5T, but worth saying anyway |
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80 invariant_options -cpu 5T -fy -Ono_known_library -fpu softvfp --dll_vtbl -apcs /inter |
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81 |
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82 ------------------------------------------END EXAMPLE----------------------------------------- |
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83 |