[gspell/wip/cmake] cmake: start, check pkg-config modules

[Sébastien Wilmet <swilmet src gnome org>]

commit ef28b98dbf6d00026b6951ffaec28046c3fa71b1
Author: Sébastien Wilmet <swilmet informatique-libre be>
Date:   Tue Aug 16 16:00:00 2022 +0200

    cmake: start, check pkg-config modules

 CMakeLists.txt  |  8 +++++
 cmake/gsw.cmake | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 107 insertions(+)
---
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..ac4b838
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required (VERSION 3.20)
+project (gspell
+  LANGUAGES C)
+
+include (cmake/gsw.cmake)
+GswInitBasic ()
+
+pkg_check_modules (DEPS REQUIRED glib-2.0>=2.44)
diff --git a/cmake/gsw.cmake b/cmake/gsw.cmake
new file mode 100644
index 0000000..94bc73d
--- /dev/null
+++ b/cmake/gsw.cmake
@@ -0,0 +1,99 @@
+# "Gsw" as in "G swilmet" or "G software", as a namespace.
+
+
+macro (GswInitBasic)
+  find_package (PkgConfig)
+  include (GNUInstallDirs)
+  set (CMAKE_EXPORT_COMPILE_COMMANDS TRUE)
+endmacro ()
+
+# Try to mimic the AX_COMPILER_FLAGS Autotools macro.
+#
+# For the rationale (having such a long list of flags instead of just relying on
+# -Wall and -Wextra) see the GCC manpage for the -Wall option:
+#
+# """
+# Note that some warning flags are not implied by -Wall. Some of them warn about
+# constructions that users generally do not consider questionable, but which
+# occasionally you might wish to check for; others warn about constructions that
+# are necessary or hard to avoid in some cases, and there is no simple way to
+# modify the code to suppress the warning. Some of them are enabled by -Wextra
+# but many of them must be enabled individually.
+# """
+function (GswCompilerFlags)
+  add_compile_options (
+    "-Wall"
+    "-Wextra"
+    "-fno-strict-aliasing"
+    "-Wundef"
+    "-Wwrite-strings"
+    "-Wpointer-arith"
+    "-Wmissing-declarations"
+    "-Wredundant-decls"
+    "-Wno-unused-parameter"
+    "-Wno-missing-field-initializers"
+    "-Wformat=2"
+    "-Wcast-align"
+    "-Wformat-nonliteral"
+    "-Wformat-security"
+    "-Wsign-compare"
+    "-Wstrict-aliasing"
+    "-Wshadow"
+    "-Winline"
+    "-Wpacked"
+    "-Wmissing-format-attribute"
+    "-Wmissing-noreturn"
+    "-Winit-self"
+    "-Wredundant-decls"
+    "-Wmissing-include-dirs"
+    "-Wunused-but-set-variable"
+    "-Warray-bounds"
+    "-Wreturn-type"
+    "-Wswitch-enum"
+    "-Wswitch-default"
+    "-Wduplicated-cond"
+    "-Wduplicated-branches"
+    "-Wlogical-op"
+    "-Wrestrict"
+    "-Wnull-dereference"
+    "-Wdouble-promotion"
+    "-Wnested-externs"
+    "-Wmissing-prototypes"
+    "-Wstrict-prototypes"
+    "-Wdeclaration-after-statement"
+    "-Wimplicit-function-declaration"
+    "-Wold-style-definition"
+    "-Wjump-misses-init"
+  )
+endfunction ()
+
+# When pkg-config is used.
+function (GswAddExecutable pkg_dep executable_name sources)
+  include_directories (${${pkg_dep}_INCLUDE_DIRS})
+  add_compile_options (${${pkg_dep}_CFLAGS_OTHER})
+  add_executable ("${executable_name}" ${sources})
+  target_link_libraries ("${executable_name}" ${${pkg_dep}_LDFLAGS})
+
+  install (TARGETS "${executable_name}"
+    DESTINATION "${CMAKE_INSTALL_BINDIR}")
+endfunction ()
+
+# When pkg-config is used.
+function (GswAddLibrary pkg_dep library_name sources)
+  include_directories (${${pkg_dep}_INCLUDE_DIRS})
+  add_compile_options (${${pkg_dep}_CFLAGS_OTHER})
+  add_library ("${library_name}" SHARED ${sources})
+  target_link_libraries ("${library_name}" ${${pkg_dep}_LDFLAGS})
+
+  install (TARGETS "${library_name}"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}")
+endfunction ()
+
+# Useful for printing a configuration summary.
+function (GswYesOrNo condition result)
+  if (${condition})
+    set (${result} yes PARENT_SCOPE)
+  else ()
+    set (${result} no PARENT_SCOPE)
+  endif ()
+endfunction ()