Merge pull request xmake-io#5902 from xmake-io/gcc

fix gcc pch xmake-io#5858

xmake/modules/core/tools/gcc.lua

@@ -630,6 +630,19 @@ function _has_color_diagnostics(self)
     return colors_diagnostics
 end
 
+-- has gnu-line-marker flag?
+function _has_gnu_line_marker_flag(self)
+    local gnu_line_marker = _g._HAS_GNU_LINE_MARKER
+    if gnu_line_marker == nil then
+        if self:has_flags({"-Wno-gnu-line-marker", "-Werror"}, "cxflags") then
+            gnu_line_marker = true
+        end
+        gnu_line_marker = gnu_line_marker or false
+        _g._HAS_GNU_LINE_MARKER = gnu_line_marker
+    end
+    return gnu_line_marker
+end
+
 -- get preprocess file path
 function _get_cppfile(sourcefile, objectfile)
     return path.join(path.directory(objectfile), "__cpp_" .. path.basename(objectfile) .. path.extension(sourcefile))
@@ -742,6 +755,15 @@ function _preprocess(program, argv, opt)
     if linemarkers == false then
         table.insert(cppflags, "-P")
     end
+    -- if we want to support pch for gcc, we need to enable this flag
+    -- and clang need not this flag, it will use '-include-pch' to include and preprocess header files
+    -- but it will be slower than non-ccache mode.
+    --
+    -- @see https://github.com/xmake-io/xmake/issues/5858
+    -- https://musescore.org/en/node/182331
+    if is_gcc then
+        table.insert(cppflags, "-fpch-preprocess")
+    end
     table.insert(cppflags, "-o")
     table.insert(cppflags, cppfile)
     table.insert(cppflags, sourcefile)
@@ -758,7 +780,7 @@ function _preprocess(program, argv, opt)
 
     -- suppress -Wgnu-line-marker warnings
     -- @see https://github.com/xmake-io/xmake/issues/5737
-    if is_gcc or is_clang then
+    if (is_gcc or is_clang) and _has_gnu_line_marker_flag(tool) then
         table.insert(flags, "-Wno-gnu-line-marker")
     end
 
@@ -788,8 +810,14 @@ function _compile_preprocessed_file(program, cppinfo, opt)
     end
     local outdata, errdata = os.iorunv(program, argv, opt)
     -- we need to get warning information from output
-    cppinfo.outdata = outdata
-    cppinfo.errdata = errdata
+    -- and we need to reserve warnings output from preprocessing
+    -- @see https://github.com/xmake-io/xmake/issues/5858
+    if outdata then
+        cppinfo.outdata = (cppinfo.outdata or "") .. outdata
+    end
+    if errdata then
+        cppinfo.errdata = (cppinfo.errdata or "") .. errdata
+    end
 end
 
 -- do compile

xmake/modules/private/action/build/pcheader.lua

@@ -25,20 +25,31 @@ import("object")
 function config(target, langkind, opt)
     local pcheaderfile = target:pcheaderfile(langkind)
     if pcheaderfile then
-        local headerfile = target:autogenfile(pcheaderfile)
-        if target:is_plat("windows") and
-            target:has_tool(langkind == "cxx" and "cxx" or "cc", "cl", "clang_cl") then
-             -- fix `#pragma once` for msvc
-             -- https://github.com/xmake-io/xmake/issues/2667
-             if not os.isfile(headerfile) then
+        local sourcekind = language.langkinds()[langkind] or "cxx"
+        if target:has_tool(sourcekind, "cl", "clang_cl", "gcc", "gxx") then
+            local headerfile = target:autogenfile(pcheaderfile)
+            local gcc = false
+            if target:has_tool(sourcekind, "gcc", "gxx") then
+                local pcoutputfile = target:pcoutputfile(langkind)
+                headerfile = path.join(path.directory(pcoutputfile), path.filename(headerfile))
+                gcc = true
+            end
+            -- fix `#pragma once` for msvc
+            -- https://github.com/xmake-io/xmake/issues/2667
+            -- https://github.com/xmake-io/xmake/issues/5858
+            if not os.isfile(headerfile) then
                 io.writefile(headerfile, ([[
 #pragma system_header
 #ifdef __cplusplus
 #include "%s"
 #endif // __cplusplus
                 ]]):format(path.absolute(pcheaderfile):gsub("\\", "/")))
             end
-            target:pcheaderfile_set(langkind, headerfile)
+            -- we need only to add a header wrapper in .gch directory
+            -- @see https://github.com/xmake-io/xmake/issues/5858#issuecomment-2506918167
+            if not gcc then
+                target:pcheaderfile_set(langkind, headerfile)
+            end
         end
     end
 end