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zephyr/cmake/linker
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Marc Herbert 3ebb18b882 cmake: fix utterly cryptic error handling in the -DSPARSE=y build 
Fixes commit 7a85ff7683 ("add sparse support")

The sparse build needs (at least) two things:
1. sparse to be in the PATH
2. the environment variable REAL_CC to be defined and to match the
   value expected by CMake

Fix error messages when either condition is wrong.

- New error message when 1. is not satisfied:
```
CMake Error at zephyr/cmake/compiler/gcc/target.cmake:12 (find_program):
  Could not find CMAKE_C_COMPILER using the following names: cgcc
```

- Previous error "message" when 1. is not satisfied:
```
CMake Error at zephyr/cmake/compiler/gcc/target.cmake:17 (message):
  C compiler
  ZSDK/xtensa-intel_s1000_zephyr-elf/bin/xtensa-intel_s1000_zephyr-elf-gcc
  not found - Please check your toolchain installation
```
Note the "not found" cross-compiler actually exists!

- New error message when 2. is not satisfied:
```
Kconfig header saved to 'ws/build-tgl/zephyr/include/generated/autoconf.h'
-- Found sparse: /home/user/sparse/cgcc
CMake Error at ws/zephyr/cmake/compiler/gcc/target.cmake:25 (message):
  The only way to override its 'cc' default when cross-compiling with
  sparse is unfortunately an environment variable.  So you _must_ set
  REAL_CC at both configuration time and build time to:
  $ZSDK/xtensa-intel_s1000_zephyr-elf/bin/xtensa-intel_s1000_zephyr-elf-gcc

```

- Previous error "message" when 2. is not satisfied:
```
modules/hal/xtensa/include/xtensa/config/core.h:54:10:
    error:unable to open 'core-isa.h'`
```

Also: stop using the same name REAL_CC for both the internal CMake
variable and the external sparse parameter; they're two different
things so name them differently. Environment variable messes are
complicated enough.

Signed-off-by: Marc Herbert <marc.herbert@intel.com>
 		2022-09-22 15:12:22 +00:00
..
arcmwdt scripts: move gen_relocate_app.py to scripts/build 2022-07-12 10:03:45 +02:00
armlink
…
ld cmake: fix utterly cryptic error handling in the -DSPARSE=y build 2022-09-22 15:12:22 +00:00
lld
…
linker_flags_template.cmake cmake: Update CONFIG_ASAN support 2022-08-19 08:30:01 +02:00
linker_script_common.cmake
…