CMake: add debug options to windows builds

gcc and clang always build with '-g', enabling easier debugging, so
catch MSVC to the same.

This will create seperate program database (.pdb) files, which map
identifiers and statements in the project's source code to
corresponding identifiers and instructions in compiled apps.
These mapping files link the debugger to your source code, which
enables debugging.

Hopefully this will put a stop to those who want to build in windows
in debug mode (which is not possible, see #772)

This does not include the pdb files in the installers, so the only way
to get them is build locally.

Signed-off-by: Robin Getz <[email protected]>

CMakeLists.txt

@@ -67,7 +67,9 @@ if (NOT LOG_LEVEL)
 endif()
 
 if (MSVC)
-	add_compile_options(/W4 /wd4200 /wd4127 /wd4100)
+	add_compile_options(/Zi /W4 /wd4200 /wd4127 /wd4100)
+	# Zi produces a separate PDB file that contains all the symbolic debugging information
+	# W4 displays level 1, 2, 3, and 4 (informational) warnings that aren't off by default
 	# C4200: nonstandard extension used : zero-sized array in struct (usb.h)
 	# C4127: conditional expression is constant (IIO_ERROR and IIO_DEBUG macros)
 	# C4100: unreferenced parameter; same as -Wno-unused-parameter
@@ -474,6 +476,8 @@ target_link_libraries(iio LINK_PRIVATE ${LIBS_TO_LINK})
 
 if (MSVC)
 	set_target_properties(iio PROPERTIES OUTPUT_NAME libiio)
+	target_link_options(iio PUBLIC /DEBUG)
+	# The linker puts debugging information into a program database (PDB) file
 endif()
 
 if(NOT SKIP_INSTALL_ALL)

tests/CMakeLists.txt

@@ -37,6 +37,16 @@ add_executable(iio_readdev iio_readdev.c  ${GETOPT_C_FILE} ${LIBIIO_RC})
 add_executable(iio_reg     iio_reg.c      ${GETOPT_C_FILE} ${LIBIIO_RC})
 add_executable(iio_writedev iio_writedev.c  ${GETOPT_C_FILE} ${LIBIIO_RC})
 
+if (MSVC)
+	target_link_options(iio_tests_helper PUBLIC /DEBUG)
+	target_link_options(iio_genxml   PUBLIC /DEBUG)
+	target_link_options(iio_info     PUBLIC /DEBUG)
+	target_link_options(iio_attr     PUBLIC /DEBUG)
+	target_link_options(iio_readdev  PUBLIC /DEBUG)
+	target_link_options(iio_reg      PUBLIC /DEBUG)
+	target_link_options(iio_writedev PUBLIC /DEBUG)
+endif()
+
 target_link_libraries(iio_genxml  iio iio_tests_helper)
 target_link_libraries(iio_info    iio iio_tests_helper)
 target_link_libraries(iio_attr    iio iio_tests_helper)