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Date: Mon, 20 Feb 2023 16:11:39 -0800 (PST)
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Subject: Weird error emanating from GNAT binder: duplicat "gnatS"
From: Jerry <list_email@icloud.com>
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I have the following program...


with Common;
procedure Test_gnatS_Problem is
begin
    null;
end Test_gnatS_Problem;


which is complied with GNAT 12.2.0 on MacOS 12.5. This minimal example is of course reduced from a useful program of mine. I am not including the gpr file here unless someone wants to see it. The output is...


Compile
   [Ada]          Test_gnatS_Problem.adb
   [Ada]          common.adb
   [Ada]          signal_processing.adb
   [Ada]          GSL_Thin.adb
GSL_Thin.adb:27:09: warning: unreachable code [enabled by default]
   [Ada]          numerical_recipes.adb
numerical_recipes.adb:209:13: warning: unreachable code [enabled by default]
   [Ada]          signals.adb
Bind
   [gprbind]      Test_gnatS_Problem.bexch
   [Ada]          Test_gnatS_Problem.ali
b__Test_gnatS_Problem.ads:582:30: error: external name duplicates name given at line 578
gprbind: compilation of binder generated file failed
gprbuild: unable to bind Test_gnatS_Problem.adb


I don't believe the warnings are germain. Here are a few lines from the referenced b__Test_gnatS_Problem.ads...


575   u00267 : constant Version_32 := 16#db4cf09e#;
576   pragma Export (C, u00267, "ada__strings__superboundedS");
577   u00268 : constant Version_32 := 16#b5988c27#;
578   pragma Export (C, u00268, "gnatS");
579   u00269 : constant Version_32 := 16#1a69b526#;
580   pragma Export (C, u00269, "gnat__os_libS");
581   u00270 : constant Version_32 := 16#b5988c27#;
582   pragma Export (C, u00270, "gnatS");
583   u00271 : constant Version_32 := 16#aebf1ee6#;
584   pragma Export (C, u00271, "system__byte_swappingS");


>From the docs' listing of compiler switches...


-gnatS    Print package Standard


Possibly relevant is that common and signal_processiung "with" eacb other and I have added a "limited with Signal_Processing" to common.ads.

I have no idea what is happening. I have compiled these sources zillions of times without seeing this problem. There is no reported problem with the source files, only the b_ file.

Jerry