使用项目依赖项“ gpr.gpr”与GNAT Studio编译Ada项目时，出现以下错误。
错误：错误
这是我的项目源代码：
with "gpr.gpr";
project Default is
for Soure_Dirs use ("src");
for Object_Dir use "obj";
for Main use ("main.adb")
end Default;
gpr.gpr中有一行引起错误：error-on-line
如果我要引用另一个依赖项，例如“ aws.gpr”，则一切正常。但是，“ gpr.gpr”和任何引用它的项目都不会编译。
输出到：gprbuild -vP2 -P default.gpr
Process tree, phase 1
Value_Of (library_type) is default "static"
Value_Of (xmlada_build) is default "static"
Value_Of (library_type) is default "static"
Value_Of (xmlada_build) is default "static"
Value_Of (library_type) is default "static"
Value_Of (xmlada_build) is default "static"
Value_Of (library_type) is default "static"
Value_Of (xmlada_build) is default "static"
Value_Of (library_type) is default "static"
Value_Of (xmlada_build) is default "static"
Value_Of (library_type) is default "static"
Value_Of (gpr_build) is "C:\GNAT\2020\bin"
ERROR: value %% is illegal for typed string %%
Done Process tree, phase 1, Success=FALSE
gpr.gpr:11:04: value "C:\GNAT\2020\bin" is illegal for typed string "build"
gprbuild: "default.gpr" processing failed
根据对原始问题的评论，似乎GPR_BUILD设置了名为环境变量，而GPR_BUILD项目使用了场景变量gpr.gpr。在给定项目文件源的情况下，可以通过在Windows命令行上执行来重现该错误。
> set GPR_BUILD=C:\GNAT\2020\bin
接着
> gprbuild -P default.gpr
gpr.gpr:11:04: value "C:\GNAT\2020\bin" is illegal for typed string "build"
gprbuild: "default.gpr" processing failed
有关方案变量的更多信息，请参见GPRbuild用户指南，第2.4节。
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