[S] Change in flashrom[master]: tests: Add llvm-cov optio and run target for code coverage

[Evan Benn (Code Review)]

Evan Benn has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/69268 )

Change subject: tests: Add llvm-cov optio and run target for code coverage
......................................................................

tests: Add llvm-cov optio and run target for code coverage

Code coverage can be requested with -Dllvm_cov and run with ninja
llvm-cov.

BUG=b:187647884
BRANCH=None
TEST=meson test; ninja llvm-cov

Change-Id: Id6c73bff46e7b88d425956a80def97082b201f56
Signed-off-by: Evan Benn 
---
M Documentation/building.md
M meson.build
M meson_options.txt
A scripts/llvm-cov
4 files changed, 40 insertions(+), 8 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/68/69268/1

diff --git a/Documentation/building.md b/Documentation/building.md
index 445fd65..9893512 100644
--- a/Documentation/building.md
+++ b/Documentation/building.md
@@ -60,12 +60,9 @@
 #### llvm
 https://clang.llvm.org/docs/SourceBasedCodeCoverage.html
 ```
-env CFLAGS="-fprofile-instr-generate -fcoverage-mapping" CC=clang meson setup buildclangcov
-env LLVM_PROFILE_FILE=default.profraw ninja -C buildclangcov test
-cd buildclangcov
-llvm-profdata merge -sparse default.profraw -o default.profdata
-llvm-cov show ./flashrom_unit_tests -instr-profile=default.profdata --format=html --output-dir=.
-open index.html
+env CC=clang meson setup buildclangcov -Dllvm_cov=true
+ninja -C buildclangcov test
+ninja -C buildclangcov llvm-cov
 ```

## System specific information
diff --git a/meson.build b/meson.build
index 81c7190..3fa8ab8 100644
--- a/meson.build
+++ b/meson.build
@@ -47,6 +47,7 @@
 config_default_programmer_args = get_option('default_programmer_args')

cargs = []
+link_args = []
 deps = []
 srcs = files(
   '82802ab.c',
@@ -530,6 +531,11 @@

cargs += '-DCONFIG_DEFAULT_PROGRAMMER_ARGS="' + config_default_programmer_args + '"'

+if get_option('llvm_cov')
+  cargs += ['-fprofile-instr-generate', '-fcoverage-mapping']
+  link_args += ['-fprofile-instr-generate', '-fcoverage-mapping']
+endif
+
 install_headers([
     'include/libflashrom.h',
   ],
@@ -558,7 +564,7 @@
     cargs,
   ],
   install : true,
-  link_args : vflag,
+  link_args : link_args + [vflag],
   link_depends : mapfile,
 )

@@ -602,6 +608,7 @@
     include_directories : include_dir,
     install : true,
     install_dir : get_option('sbindir'),
+    link_args : link_args,
     link_with : libflashrom.get_static_lib(), # flashrom needs internal symbols of libflashrom
   )
 endif
@@ -745,10 +752,14 @@
       '-fdata-sections',
     ],
     export_dynamic : true,
-    link_args : mocks,
+    link_args : mocks + link_args,
     dependencies : [cmocka_dep, flashrom_test_dep],
   )
   test('cmocka test flashrom', flashrom_tests, timeout: 60)
+
+  if get_option('llvm_cov')
+    run_target('llvm-cov', command : ['scripts/llvm-cov', flashrom_tests])
+  endif
 endif

programmer_names_active     = []
diff --git a/meson_options.txt b/meson_options.txt
index 8c04029..fcab26a 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -16,3 +16,4 @@
         'pickit2_spi', 'pony_spi', 'raiden_debug_spi', 'rayer_spi', 'realtek_mst_i2c_spi', 'satamv',
         'satasii', 'serprog',  'stlinkv3_spi', 'usbblaster_spi',
 ], description: 'Active programmers')
+option('llvm_cov', type : 'boolean', value : 'false', description : 'build for llvm code coverage')
diff --git a/scripts/llvm-cov b/scripts/llvm-cov
new file mode 100755
index 0000000..b512b3d
--- /dev/null
+++ b/scripts/llvm-cov
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+cd "${MESON_BUILD_ROOT}"
+llvm-profdata merge -sparse default.profraw -o default.profdata
+llvm-cov show -instr-profile=default.profdata -format=html -output-dir=. "$@"
+echo "file://${MESON_BUILD_ROOT}/index.html"